I want to get all the records within the last 24-hour according to LastModifiedDate , Here is what I am doing

global class SalesOrderSchedule implements Schedulable
{
    global static String CRON_EXP = '0 0 0   ? *'; 

    global void execute(SchedulableContext sc)
    {
        doOpportunityUpdates();
    }

    global void doOpportunityUpdates()
    {
        List<Opportunity> opps = new List<Opportunity>();
        DateTime dt_lastDay = System.now()-1;
        DateTime dt_currentDay = System.now();
        for(Sales_Order__c salesorder : [select id, Name, LastModifiedDate from Sales_Order__c WHERE LastModifiedDate  > = :dt_lastDay AND LastModifiedDate < :dt_currentDay ] )
        {
         //my functionality    
    }
}

global class SalesOrderSchedule implements Schedulable
{

global static void checkrun()
    {
 String day = string.valueOf(system.now().day());
                String month = string.valueOf(system.now().month());
                String hour = string.valueOf(system.now().hour());
                String minute = string.valueOf(system.now().minute());
                String second = string.valueOf(system.now().second());
                String year = string.valueOf(system.now().year());

                String JobName = 'Scheduled Job of sales Order';
                String strSchedule = second +' ' + minute+' '+ hour+' '+ day+' '+month+' ?'+' '+ year;
                system.schedule(JobName, strSchedule, new SalesOrderSchedule());    
    }    
  global void execute(SchedulableContext sc)
  {
  Opportunity opp;
    
  for (Sales_Order__c salesorders : [select id, Name, LastModifiedDate,    Quote__c, OrderNum__c from Sales_Order__c WHERE LastModifiedDate  >= LAST_N_DAYS:1])
         {
             String OppNewStage=null;
             if (salesorders.OrderNum__c=='QUOTE WON')
             {
             OppNewStage='Closed Won';
              }
             else if (salesorders.OrderNum__c=='QUOTE LOST')
             {
             OppNewStage='Closed Lost';
             }
             else 
             {
              OppNewStage='Quoted';
             }
             
       opp=[select id, Name, StageName from Opportunity where id=:salesorders.Quote__c]; 
     opp.StageName=OppNewStage;
     update opp;
     
    
     }
     

   
  }
}

@isTest
public class SalesOrderScheduleTest {
    static testMethod void myTestMethod() {        
         test.starttest();
     SalesOrderSchedule.checkrun();
     
   String chron = '0 0 12 15 9 ? 2015' ;        
         system.schedule('job', chron, new SalesOrderSchedule());
         test.stopTest();
    }
}

Static checkrun method is not covering, how to increase the code coverage ?? Guys help 

I have integrated my heroku apps in sales force using canvus, every thing was fine , apps were wroking fine in salesforce, but now when i tried to acces my apps in salesforce it's giving the following error 

Authentication Failed: OAuth login invalid or expired access token error

what can be the possible reason of this issue, Guys help. 

String theId = ApexPages.currentPage().getParameters().get('id');
 List<OpportunityLineItem> currentOppLI = [
                                SELECT PricebookEntryId, Quantity, UnitPrice,
                                       TotalPrice, ListPrice, Description
                                FROM OpportunityLineItem
                                WHERE OpportunityId = :theId];
 //Create the Order
                    Order odr = new Order(  
                    OpportunityId=o.id
                    ,AccountId = o.AccountId
                    ,Name = o.Name
                    ,EffectiveDate=Date.today()
                    ,Status='Draft'
                    ,Pricebook2Id = o.Pricebook2Id
                    );
                insert odr;
                //copy Opportunity line items to Order line items
                  List<OrderItem> newOrderProductsList = new List<OrderItem>();
    
        for (OpportunityLineItem item : currentOppLI) {
             newOrderProductsList.add(new OrderItem(
                    PricebookEntryId = item.PricebookEntryId,
                    Quantity = item.Quantity,
                    UnitPrice = item.UnitPrice,
                    Description = item.Description,
                    OrderId = odr.Id));
         }
             insert newOrderProductsList;  

 List<OpportunityLineItem> newOppLI = new List<OpportunityLineItem>();
        
        for (OpportunityLineItem item : currentOppLI) {
             newOppLI.add(new OpportunityLineItem(
             PricebookEntryId = item.PricebookEntryId,   
             Quantity = item.Quantity,
             UnitPrice = item.UnitPrice,
             Description = item.Description,
             OpportunityId = opp.Id));
         }
            
    insert newOppLI;   


//opp is newly created opportunity and odr is newly created order

public class myclass{
 
    
    public Opportunity o;
    String theId = ApexPages.currentPage().getParameters().get('id');
  
    
   @TestVisible public List<WrapperSObject> records {get; set;}
    public Contract con {get; set;}
    public String selectedValue {get; set;}
  
  public  myclass(ApexPages.StandardController stdController) {
        this.o = (Opportunity)stdController.getRecord();
    }
     
    public PageReference autoRun() {
 
        String theId = ApexPages.currentPage().getParameters().get('id');
         if (theId == null) {
            return null;
        }
    
records = new List<WrapperSObject>();
 for (Contract c : [select id, Name, AccountId, StartDate, Status, ContractNumber from Contract where Status='Activated'  ])
 {
 records.add(new WrapperSObject(c, getOptions(), 'Activated')); //this line is not getting covered
 }
     return null;
          
}
 public PageReference MainMethod() {
 
/// other code
    
        return null;        
  }


// To Update contracts 
 public PageReference back() {
       List<Contract> contractToBeUpdate = new List<Contract>();
    for(WrapperSObject wrapper : records){
        wrapper.con.status = wrapper.selectedValue;
        contractToBeUpdate.add(wrapper.con);
    }
    update contractToBeUpdate;
    PageReference pageRef ;    
     return pageRef= MainMethod();
  }
 


@TestVisible public class WrapperSObject {
public Contract con {get; set;}
 public List < SelectOption > options {get; set;}
        public String selectedValue {get; set;}
  
     
    public WrapperSObject( Contract c,List < SelectOption > options, String selectedValue) {
    con=c;
     this.options = options;
     this.selectedValue = selectedValue;
     }
  
  }

public List < SelectOption > getOptions() {
List<SelectOption> options = new List<SelectOption>();
        options.add(new SelectOption('Activated','Activated'));
        options.add(new SelectOption('Expired','Expired'));
        options.add(new SelectOption('LAPSE','Lapse'));
        return options;
    }
  }

@isTest
private class myclassTest {
    private static testMethod void testAutoRun() {

    
        Account acc = new Account(Name='Abce');
  insert acc;
 
  Opportunity  testOppty = new Opportunity();
  testOppty.name='testOppty';
  testOppty.AccountId=acc.id;
  testOppty.CloseDate=System.today();
  testOppty.StageName= 'Closed Won';
  testOppty.Type='EnerLead Renewal';
  testOppty.Description='Newly created Oppertunity';
  insert testOppty;
  
        insert odr;
                  Contract c = new Contract(
                ,StartDate=testOppty.CloseDate
                ,AccountId = testOppty.AccountId
                ,Name = testOppty.Name
                );
            insert c;
  
 List<SelectOption> options = new List<SelectOption>();
        options.add(new SelectOption('Activated','Activated'));
        options.add(new SelectOption('Expired','Expired'));
        options.add(new SelectOption('LAPSE','Lapse'));
        
  
        
        test.startTest();
        
            PageReference pageRef = Page.myclass;
            Test.setCurrentPage(pageRef);
            
            pageRef.getParameters().put('id',testOppty.id);
            ApexPages.StandardController sc = new ApexPages.standardController(testOppty);
            
            myclass  controller = new myclass(sc);
            controller.autoRun();
            controller.back();
            controller.MainMethod();
            myclass.WrapperSObject psec = new myclass.WrapperSObject( con, options, 'Activated' );
        
       test.stopTest();
}
}

public class myclass{
 
    
    public Opportunity o;
    String theId = ApexPages.currentPage().getParameters().get('id');
  
    
   @TestVisible public List<WrapperSObject> records {get; set;}
    public Contract con {get; set;}
    public String selectedValue {get; set;}
  
  public  myclass(ApexPages.StandardController stdController) {
        this.o = (Opportunity)stdController.getRecord();
    }
     
    public PageReference autoRun() {
 
        String theId = ApexPages.currentPage().getParameters().get('id');
         if (theId == null) {
            return null;
        }
    
records = new List<WrapperSObject>();
 for (Contract c : [select id, Name, AccountId, StartDate, Status, ContractNumber from Contract where Status='Activated'  ])
 {
 records.add(new WrapperSObject(c, getOptions(), 'Activated'));
 }
     return null;
          
}
 public PageReference MainMethod() {
 
  try{
     //Create new Oppertunity
             Opportunity opp = new Opportunity(
                     Name = 'TESTACCOUNT_test july' +'Date.today()'
                     ,CloseDate=Date.today()
                     ,StageName= 'Renewal'
                     ,Type='EnerLead Renewal'
                     ,Description='Newly created Oppertunity' 
                );
            insert opp;
   
//try section     
}catch(QueryException e){
}catch(DMLException e){}
    
        return null;        
  }


// To Update contracts 
 public PageReference back() {
       List<Contract> contractToBeUpdate = new List<Contract>();
    for(WrapperSObject wrapper : records){
        wrapper.con.status = wrapper.selectedValue;
        contractToBeUpdate.add(wrapper.con);
    }
    update contractToBeUpdate;
    PageReference pageRef ;    
     return pageRef= MainMethod();
  }
 


@TestVisible public class WrapperSObject {
public Contract con {get; set;}
 public List < SelectOption > options {get; set;}
        public String selectedValue {get; set;}
  
     
    public WrapperSObject( Contract c,List < SelectOption > options, String selectedValue) {
    con=c;
     this.options = options;
     this.selectedValue = selectedValue;
     }
  
  }

public List < SelectOption > getOptions() {
List<SelectOption> options = new List<SelectOption>();
        options.add(new SelectOption('Activated','Activated'));
        options.add(new SelectOption('Expired','Expired'));
        options.add(new SelectOption('LAPSE','Lapse'));
        return options;
    }
  }

@isTest
private class myclassTest {
    private static testMethod void testAutoRun() {

    
        Account acc = new Account(Name='Abce');
  insert acc;
 
  Opportunity  testOppty = new Opportunity();
  testOppty.name='testOppty';
  testOppty.AccountId=acc.id;
  testOppty.CloseDate=System.today();
  testOppty.StageName= 'Closed Won';
  testOppty.Type='EnerLead Renewal';
  testOppty.Description='Newly created Oppertunity';
  insert testOppty;
  
        insert odr;
                  Contract c = new Contract(
                ,StartDate=testOppty.CloseDate
                ,AccountId = testOppty.AccountId
                ,Name = testOppty.Name
                );
            insert c;
  
  
        
        test.startTest();
        
            PageReference pageRef = Page.myclass;
            Test.setCurrentPage(pageRef);
            
            pageRef.getParameters().put('id',testOppty.id);
            ApexPages.StandardController sc = new ApexPages.standardController(testOppty);
            
            myclass  controller = new myclass(sc);
            controller.autoRun();
            controller.back();
            controller.MainMethod();
        test.stopTest();
}
}

public class myclass{
 
    
    public Opportunity o;
    String theId = ApexPages.currentPage().getParameters().get('id');
    List<OpportunityContactRole> oppRoles;
    Contract[] myContract;
    Opportunity[] myOpportunity;
    
    
    public List<WrapperSObject> records {get; set;}
    public Contract con {get; set;}
    public String selectedValue {get; set;}
    public  myclass(ApexPages.StandardController stdController) {
        this.o = (Opportunity)stdController.getRecord();
    }
     
    public PageReference autoRun() {
 
        String theId = ApexPages.currentPage().getParameters().get('id');
         if (theId == null) {
            return null;
        }
       o=[select id, name, AccountId,  StageName, Type, CloseDate from Opportunity where id =:theId];
 
records = new List<WrapperSObject>();
 for (Contract c : [select id, Name, AccountId, StartDate, Status, ContractNumber from Contract where Status='Activated'  ])
 {
 records.add(new WrapperSObject(c, getOptions(), 'Activated'));
 }
     return null;
          
}
 public PageReference MainMethod() {
 
  try{
       o=[select id, name, AccountId,  StageName, Type, CloseDate from Opportunity where id =:theId];
 
             
             //Create the contract
            Contract c = new Contract(
                ,StartDate=o.CloseDate
                ,AccountId = o.AccountId
                ,Name = o.Name
                );
            insert c;
       
       
       //copy contact roles

            oppRoles = [SELECT Id, OpportunityID, ContactID, IsPrimary, Role FROM OpportunityContactRole WHERE OpportunityId = :theId LIMIT 10000];
             myContract = [SELECT Id, ContractNumber, StartDate, EndDate,
                           AccountId, ContractTerm, Status, CustomerSignedId FROM Contract WHERE Id = :c.Id LIMIT 1];
             
             if ( ! oppRoles.isEmpty()) {
                    myContract[0].CustomerSignedId = oppRoles.get(0).ContactId;
              }  
              
              if ( ! oppRoles.isEmpty()){
                    List<ContractContactRole> conRoles = new List<ContractContactRole>();
                      
                      for (OpportunityContactRole oppRole : oppRoles)
                        { 
                             conRoles.add(new ContractContactRole(
                             ContactId = oppRole.ContactId,
                             IsPrimary = oppRole.IsPrimary,
                             Role = oppRole.Role,
                             ContractId = myContract[0].Id));                       
                         }
                         insert conRoles;
              }
                
     //Create new Oppertunity
             Opportunity opp = new Opportunity(
                     Name = 'TESTACCOUNT_test july' +'Date.today()'
                     ,CloseDate=Date.today()
                     ,StageName= 'Renewal'
                     ,Type='EnerLead Renewal'
                     ,Description='Newly created Oppertunity'
                     ,Product_Family__c='EnerLead' 
                );
            insert opp;
        //Copy roles of old opportunity to new
            
             myOpportunity = [SELECT Id, StageName, Type FROM Opportunity WHERE Id = :opp.Id LIMIT 1];
             
          
              
              if ( ! oppRoles.isEmpty()){
                    List<OpportunityContactRole> newoppRoles = new List<OpportunityContactRole>();
                      
                      for (OpportunityContactRole oppRole : oppRoles)
                        { 
                             newoppRoles.add(new OpportunityContactRole(
                             ContactId = oppRole.ContactId,
                             IsPrimary = oppRole.IsPrimary,
                             Role = oppRole.Role,
                             OpportunityId = myOpportunity[0].Id));                       
                         }
                         insert newoppRoles;
              
              }          
   
//try section     
}catch(QueryException e){
      ApexPages.Message msg = new Apexpages.Message(ApexPages.Severity.Warning,'Something is wrong' );
      ApexPages.addmessage(msg);
}catch(DMLException e){}
    
        return null;        
  }


// To Update contracts 
 public PageReference back() {
       List<Contract> contractToBeUpdate = new List<Contract>();
    for(WrapperSObject wrapper : records){
        wrapper.con.status = wrapper.selectedValue;
        contractToBeUpdate.add(wrapper.con);
    }
    update contractToBeUpdate;
    PageReference pageRef ;    
     return pageRef= MainMethod();
  }
 


public class WrapperSObject {
public Contract con {get; set;}
 public List < SelectOption > options {get; set;}
        public String selectedValue {get; set;}
  
     
    public WrapperSObject( Contract c,List < SelectOption > options, String selectedValue) {
    con=c;
     this.options = options;
     this.selectedValue = selectedValue;
     }
  
  }

public List < SelectOption > getOptions() {
List<SelectOption> options = new List<SelectOption>();
        options.add(new SelectOption('Activated','Activated'));
        options.add(new SelectOption('Expired','Expired'));
        options.add(new SelectOption('LAPSE','Lapse'));
        return options;
    }
  
     

}

@isTest
private class myclassTest {
    private static testMethod void testAutoRun() {

    
        Account acc = new Account(Name='Abce');
  insert acc;
 
  Opportunity  testOppty = new Opportunity();
  testOppty.name='testOppty';
  testOppty.AccountId=acc.id;
  testOppty.CloseDate=System.today();
  testOppty.StageName= 'Closed Won';
  testOppty.Type='EnerLead Renewal';
  testOppty.Description='Newly created Oppertunity';
  testOppty.Product_Family__c='EnerLead'; 
  insert testOppty;
  
        //Create the Order
                    Order odr = new Order(  
                    OpportunityId=testOppty.id
                    ,AccountId = testOppty.AccountId
                    ,Name = testOppty.Name
                    ,EffectiveDate=Date.today()
                    ,Status='Draft'
                    );
        insert odr;
                  Contract c = new Contract(
                ,StartDate=testOppty.CloseDate
                ,AccountId = testOppty.AccountId
                ,Name = testOppty.Name
                );
            insert c;
  
  
        
        test.startTest();
        
            PageReference pageRef = Page.myclass;
            Test.setCurrentPage(pageRef);
            
            pageRef.getParameters().put('id',testOppty.id);
            ApexPages.StandardController sc = new ApexPages.standardController(testOppty);
            
            myclass  controller = new myclass(sc);
            controller.autoRun();
            controller.back();
            controller.MainMethod();
        test.stopTest();
}
}

• "copying contact roles from old to new opportunity and contract"
• "Wrapper class and last getoptions() selection method"?

String theId = ApexPages.currentPage().getParameters().get('id');
List<OpportunityContactRole> oppRoles;
oppRoles = [SELECT Id, OpportunityID, ContactID, IsPrimary, Role FROM OpportunityContactRole WHERE OpportunityId = :theId LIMIT 10000];
            
//copying contact roles of old opportunity to new opportunity

if ( ! oppRoles.isEmpty()){
                    List<ContractContactRole> conRoles = new List<ContractContactRole>();
                      
                      for (OpportunityContactRole oppRole : oppRoles)
                        { 
                             conRoles.add(new ContractContactRole(
                             ContactId = oppRole.ContactId,
                             IsPrimary = oppRole.IsPrimary,
                             Role = oppRole.Role,
                             ContractId = myContract[0].Id));                       
                         }
                         insert conRoles;
              }
// myContract[0] is also defined and working fine,  code will become long so  here not mentioned, 
/// also copying the contact roles of opportunity to newly created contract

if ( ! oppRoles.isEmpty()){
                    List<ContractContactRole> conRoles = new List<ContractContactRole>();
                      
                      for (OpportunityContactRole oppRole : oppRoles)
                        { 
                             conRoles.add(new ContractContactRole(
                             ContactId = oppRole.ContactId,
                             IsPrimary = oppRole.IsPrimary,
                             Role = oppRole.Role,
                             ContractId = myContract[0].Id));                       
                         }
                         insert conRoles;
              }

<apex:page standardController="Opportunity"
 extensions="Opp2Order"
 action="{!autoRun}">
  
  <apex:form >

<apex:pageBlock title="My Active Contracts" > 
        <apex:pageBlockTable value="{!records}"  var="wrapper"> 
             <apex:column > 
                <apex:facet name="header">Contract Number</apex:facet> 
                <apex:outputText value="{!wrapper.con.ContractNumber}"/> 
            </apex:column> 
            <apex:column > 
                <apex:facet name="header">Contract ID</apex:facet> 
                <apex:outputText value="{!wrapper.con.id}"/> 
            </apex:column> 
            
            <apex:column > 
                <apex:facet name="header">Change Status</apex:facet> 
                <apex:selectList value="{!wrapper.selectedValue}" size="1" onchange="changeStatus()" >
                            <apex:selectOptions value="{!wrapper.options}" />  
                        </apex:selectList>
                        
           </apex:column> 
              </apex:pageBlockTable>    
         </apex:pageBlock> 
  <apex:commandButton action="{!back}" value="Save!" />
  
    </apex:form>
  
  
</apex:page>

public class Opp2Order {
 
    
    String theId = ApexPages.currentPage().getParameters().get('id');
    
    
    public List<WrapperSObject> records {get; set;}
    public Contract con {get; set;}
    public String selectedValue {get; set;}
 
   public Opp2Order(ApexPages.StandardController stdController) {
        this.o = (Opportunity)stdController.getRecord();
    }
     
    public PageReference autoRun() {
  records = new List<WrapperSObject>();
 for (Contract c : [select id, Name, AccountId, StartDate, Status, ContractNumber from Contract where Status='Activated'])
 {
 records.add(new WrapperSObject(c, getOptions(), 'Activated'));
 }

             return null;         
}

 public PageReference back() {
  // How to here update the status of all contracts 
  }
 
 public void changeStatus()
 {
    // in back() method or in this method ? I am confused
 }

public class WrapperSObject {
public Contract con {get; set;}
 public List < SelectOption > options {get; set;}
        public String selectedValue {get; set;}
  
     
    public WrapperSObject( Contract c,List < SelectOption > options, String selectedValue) {
    con=c;
     this.options = options;
     this.selectedValue = selectedValue;
     }
  
  }

public List < SelectOption > getOptions() {
List<SelectOption> options = new List<SelectOption>();
        options.add(new SelectOption('Activated','Activated'));
        options.add(new SelectOption('Expired','Expired'));
        options.add(new SelectOption('LAPSE','Lapse'));
        return options;
    }
}

<apex:page standardController="Opportunity"
 extensions="Opp2Order"
 action="{!autoRun}">
  
  <apex:form >

<apex:pageBlock title="My Active Contracts" > 
        <apex:pageBlockTable value="{!records}"  var="wrapper"> 
             <apex:column > 
                <apex:facet name="header">Contract Number</apex:facet> 
                <apex:outputText value="{!wrapper.con.ContractNumber}"/> 
            </apex:column> 
            <apex:column > 
                <apex:facet name="header">Contract ID</apex:facet> 
                <apex:outputText value="{!wrapper.con.id}"/> 
            </apex:column> 
            
            <apex:column > 
                <apex:facet name="header">Change Status</apex:facet> 
                <apex:selectList value="{!wrapper.selectedValue}" size="1" onchange="changeStatus()" >
                            <apex:selectOptions value="{!wrapper.options}" />  
                        </apex:selectList>
                        
           </apex:column> 
              </apex:pageBlockTable>    
         </apex:pageBlock> 
  <apex:commandButton action="{!back}" value="Save!" />
  
    </apex:form>
  
  
</apex:page>

public class Opp2Order {
 
    
    String theId = ApexPages.currentPage().getParameters().get('id');
    
    
    public List<WrapperSObject> records {get; set;}
    public Contract con {get; set;}
    public String selectedValue {get; set;}
 
   public Opp2Order(ApexPages.StandardController stdController) {
        this.o = (Opportunity)stdController.getRecord();
    }
     
    public PageReference autoRun() {
  records = new List<WrapperSObject>();
 for (Contract c : [select id, Name, AccountId, StartDate, Status, ContractNumber from Contract where Status='Activated'])
 {
 records.add(new WrapperSObject(c, getOptions(), 'Activated'));
 }

             return null;         
}

 public PageReference back() {
  // How to here update the status of all contracts 
  }
 
 public void changeStatus()
 {
    // in back() method or in this method ? I am confused
 }

public class WrapperSObject {
public Contract con {get; set;}
 public List < SelectOption > options {get; set;}
        public String selectedValue {get; set;}
  
     
    public WrapperSObject( Contract c,List < SelectOption > options, String selectedValue) {
    con=c;
     this.options = options;
     this.selectedValue = selectedValue;
     }
  
  }

public List < SelectOption > getOptions() {
List<SelectOption> options = new List<SelectOption>();
        options.add(new SelectOption('Activated','Activated'));
        options.add(new SelectOption('Expired','Expired'));
        options.add(new SelectOption('LAPSE','Lapse'));
        return options;
    }
}

I want to update the status of all contracts according to selection in VF page. How to get selected value from VF pick list and how to use in Apex class. 

I am confused wether i can pick selected value and update contract status in Onchange() method or in back() method i should update the status of all contracts. How i am supposed to do that. I am stucked badly. Guy's help.  
 

public class myclass {
 
    
    String theId = ApexPages.currentPage().getParameters().get('id');
    
    
    public List<WrapperSObject> records {get; set;}
    public Contract con {get; set;}
    
    public myclass(ApexPages.StandardController stdController) {
        this.o = (Opportunity)stdController.getRecord();
    }
     
    public PageReference autoRun() {
  
 records = new List<WrapperSObject>();
 for (Contract c : [select Name, AccountId, StartDate, Status, ContractNumber from Contract where Status='Pending'])
 {
 records.add(new WrapperSObject(c));
 records.add(new WrapperSObject(getOptions(), '--None--'));
}

             return null;
          
}

 

public class WrapperSObject {
public Contract con {get; set;}
 public List < SelectOption > options {get; set;}
        public String selectedValue {get; set;}
  
      
    public WrapperSObject( List < SelectOption > options, String selectedValue) {
    
     this.options = options;
     this.selectedValue = selectedValue;

     }
     public WrapperSObject(Contract c) {
     con=c;
     }
     
     
  }

public List < SelectOption > getOptions() {
List<SelectOption> options = new List<SelectOption>();
        options.add(new SelectOption('Expired','Expired'));
        options.add(new SelectOption('LAPSE','Lapse'));
        return options;
    }

}

<apex:page standardController="Opportunity"
 extensions="myclass"
 action="{!autoRun}">
  
  <apex:form >

<apex:pageBlock title="My Pending Contracts"> 
        <apex:pageBlockTable value="{!records}"  var="wrapper"> 
             <apex:column > 
                <apex:facet name="header">Contract Number</apex:facet> 
                <apex:outputText value="{!wrapper.con.ContractNumber}"/> 
            </apex:column> 
            <apex:column > 
                <apex:facet name="header">Contract Name</apex:facet> 
                <apex:outputText value="{!wrapper.con.Status}"/> 
            </apex:column>
            
            <apex:column > 
                <apex:facet name="header">Change Status</apex:facet> 
                <apex:selectList value="{!wrapper.selectedValue}" size="1" >
                            <apex:selectOptions value="{!wrapper.options}" />
                        </apex:selectList>
            </apex:column>
                       
        </apex:pageBlockTable>
        
    </apex:pageBlock> 
    </apex:form>
    
   
  
 </apex:page>

public class myclass {
 
    
    String theId = ApexPages.currentPage().getParameters().get('id');
    
    
    public List<WrapperSObject> records {get; set;}
    public Contract con {get; set;}
    
    public myclass(ApexPages.StandardController stdController) {
        this.o = (Opportunity)stdController.getRecord();
    }
     
    public PageReference autoRun() {
  
 records = new List<WrapperSObject>();
 for (Contract c : [select Name, AccountId, StartDate, Status, ContractNumber from Contract where Status='Pending'])
 {
 records.add(new WrapperSObject(c));
 records.add(new WrapperSObject(getOptions(), '--None--'));
}

             return null;
          
}

 

public class WrapperSObject {
public Contract con {get; set;}
 public List < SelectOption > options {get; set;}
        public String selectedValue {get; set;}
  
      
    public WrapperSObject( List < SelectOption > options, String selectedValue) {
    
     this.options = options;
     this.selectedValue = selectedValue;

     }
     public WrapperSObject(Contract c) {
     con=c;
     }
     
     
  }

public List < SelectOption > getOptions() {
List<SelectOption> options = new List<SelectOption>();
        options.add(new SelectOption('Expired','Expired'));
        options.add(new SelectOption('LAPSE','Lapse'));
        return options;
    }

}

<apex:page standardController="Opportunity"
 extensions="myclass"
 action="{!autoRun}">
  
  <apex:form >

<apex:pageBlock title="My Pending Contracts"> 
        <apex:pageBlockTable value="{!records}"  var="wrapper"> 
             <apex:column > 
                <apex:facet name="header">Contract Number</apex:facet> 
                <apex:outputText value="{!wrapper.con.ContractNumber}"/> 
            </apex:column> 
            <apex:column > 
                <apex:facet name="header">Contract Name</apex:facet> 
                <apex:outputText value="{!wrapper.con.Status}"/> 
            </apex:column>
            
            <apex:column > 
                <apex:facet name="header">Change Status</apex:facet> 
                <apex:selectList value="{!wrapper.selectedValue}" size="1" >
                            <apex:selectOptions value="{!wrapper.options}" />
                        </apex:selectList>
            </apex:column>
                       
        </apex:pageBlockTable>
        
    </apex:pageBlock> 
    </apex:form>
    
   
  
 </apex:page>

Why this small blank Dropdown menu is showing ? 
How to fix this ?

Now how to change the status of these contracts ? I mean how to return the value "Expired or Lapse" and update crosponding Contract ? 

Guys ay help ?

I have a button in Opportuinty page which calls myclass, i am trying to show the contracts in visual force page, my controler is Opportunity type so now i am getting error when i try to access the "ContractNumber" in SObject Opportunity, But i need to use Opportunity controler.  NOw how should i access ContractNumber and Status in Visual force page. 
Here is my Visual force page. 

<apex:page standardController="Opportunity"
 extensions="myclass"
 action="{!autoRun}">
  
<apex:pageBlock title="My  Contracts"> 
        <apex:pageBlockTable value="{!Records}"  var="Record"> 
            <apex:column > 
                <apex:facet name="header">Contract Name</apex:facet> 
                <apex:outputText value="{!Record.Name}"/> 
            </apex:column> 
             <apex:column > 
                <apex:facet name="header">Contract Number</apex:facet> 
                <apex:outputText value="{!Record.ContractNumber}"/> 
            </apex:column> 
           <apex:column > 
                <apex:facet name="header">Contract Status</apex:facet> 
                <apex:outputText value="{!Record.Status"/> 
            </apex:column> 
          </apex:pageBlockTable> 
    </apex:pageBlock> 
</apex:page>

public class  myclass {
 
    
    String theId = ApexPages.currentPage().getParameters().get('id');
    public List<Contract> Records {get; set;}

   public myclass(ApexPages.StandardController stdController) {
        this.o = (Opportunity)stdController.getRecord();
    }
     
    public PageReference autoRun() {
 Records = [select Name, AccountId, StartDate, Status, ContractNumber from Contract where Status='Pending']; 
 return null;
 }

I have a button in my opporunity which calls a apex class, Now what i want is: If the Opportunity "Type" field = MyProduct I would like an Visual force page that displays all the active Contracts related to the Account in the Opportunity. I want to be able to change the Status of the existing Contract to Expired or Lapse in visual force page. How should i do all this. I am new to Sales force. That would be a great help if some one can provide some sample code. 

<apex:page standardController="Opportunity"
 extensions="myclass"
 action="{!autoRun}">
</apex:page>

public class myclass {
    private final Opportunity o;
    String tmp;
   public myclass(ApexPages.StandardController stdController) {
        this.o = (Opportunity)stdController.getRecord();
    }
    public PageReference autoRun() {
        String theId = ApexPages.currentPage().getParameters().get('id');
 
        for (Opportunity o:[select id, name, AccountId,  from Opportunity where id =:theId]) {
 
                 //Create the Order
                    Order odr = new Order( 
                    OpportunityId=o.id
                    ,AccountId = o.AccountId
                    ,Name = o.Name
                    ,EffectiveDate=Date.today()
                    ,Status='Draft'
                    );
                insert odr;
                tmp=odr.id;            
              }                 
        PageReference pageRef = new PageReference('/' + tmp); 
        pageRef.setRedirect(true);
        return pageRef;
      }
}

I am new to apex, I have created a button to call the apex class through the visual force page. 

Here is my visual force page code. 

<apex:page standardController="Opportunity"
 extensions="myclass"
 action="{!autoRun}">
</apex:page>

public class myclass {
    private final Opportunity o;
    String tmp;
    
   public myclass(ApexPages.StandardController stdController) {
        this.o = (Opportunity)stdController.getRecord();
    }
    public PageReference autoRun() { 
        String theId = ApexPages.currentPage().getParameters().get('id');

        for (Opportunity o:[select id, name, AccountId,  from Opportunity where id =:theId]) {

                 //Create the Order
                    Order odr = new Order(  
                    OpportunityId=o.id
                    ,AccountId = o.AccountId
                    ,Name = o.Name
                    ,EffectiveDate=Date.today()
                    ,Status='Draft'
                    );
                insert odr;
                tmp=odr.id;             
              }                  
        PageReference pageRef = new PageReference('/' + tmp);  
        pageRef.setRedirect(true);
        return pageRef;
      }
}

I am totaly new to salesforce, want to do this. 
- Create a Button on Opportunity Details Page.
- Write the code to convert Opportunity to a Contract and Order, when the button is pressed.

I am realy confused how to start ? I am unable to find a solution.  I am hoping that someone here has the knowledge on how to accomplish this.  Thank in advance for your time and help

I have integrated my heroku apps in sales force using canvus, every thing was fine , apps were wroking fine in salesforce, but now when i tried to acces my apps in salesforce it's giving the following error 

Authentication Failed: OAuth login invalid or expired access token error

what can be the possible reason of this issue, Guys help. 

String theId = ApexPages.currentPage().getParameters().get('id');
List<OpportunityContactRole> oppRoles;
oppRoles = [SELECT Id, OpportunityID, ContactID, IsPrimary, Role FROM OpportunityContactRole WHERE OpportunityId = :theId LIMIT 10000];
            
//copying contact roles of old opportunity to new opportunity

if ( ! oppRoles.isEmpty()){
                    List<ContractContactRole> conRoles = new List<ContractContactRole>();
                      
                      for (OpportunityContactRole oppRole : oppRoles)
                        { 
                             conRoles.add(new ContractContactRole(
                             ContactId = oppRole.ContactId,
                             IsPrimary = oppRole.IsPrimary,
                             Role = oppRole.Role,
                             ContractId = myContract[0].Id));                       
                         }
                         insert conRoles;
              }
// myContract[0] is also defined and working fine,  code will become long so  here not mentioned, 
/// also copying the contact roles of opportunity to newly created contract

if ( ! oppRoles.isEmpty()){
                    List<ContractContactRole> conRoles = new List<ContractContactRole>();
                      
                      for (OpportunityContactRole oppRole : oppRoles)
                        { 
                             conRoles.add(new ContractContactRole(
                             ContactId = oppRole.ContactId,
                             IsPrimary = oppRole.IsPrimary,
                             Role = oppRole.Role,
                             ContractId = myContract[0].Id));                       
                         }
                         insert conRoles;
              }

<apex:page standardController="Opportunity"
 extensions="myclass"
 action="{!autoRun}">
</apex:page>

public class myclass {
    private final Opportunity o;
    String tmp;
   public myclass(ApexPages.StandardController stdController) {
        this.o = (Opportunity)stdController.getRecord();
    }
    public PageReference autoRun() {
        String theId = ApexPages.currentPage().getParameters().get('id');
 
        for (Opportunity o:[select id, name, AccountId,  from Opportunity where id =:theId]) {
 
                 //Create the Order
                    Order odr = new Order( 
                    OpportunityId=o.id
                    ,AccountId = o.AccountId
                    ,Name = o.Name
                    ,EffectiveDate=Date.today()
                    ,Status='Draft'
                    );
                insert odr;
                tmp=odr.id;            
              }                 
        PageReference pageRef = new PageReference('/' + tmp); 
        pageRef.setRedirect(true);
        return pageRef;
      }
}

String theId = ApexPages.currentPage().getParameters().get('id');
 List<OpportunityLineItem> currentOppLI = [
                                SELECT PricebookEntryId, Quantity, UnitPrice,
                                       TotalPrice, ListPrice, Description
                                FROM OpportunityLineItem
                                WHERE OpportunityId = :theId];
 //Create the Order
                    Order odr = new Order(  
                    OpportunityId=o.id
                    ,AccountId = o.AccountId
                    ,Name = o.Name
                    ,EffectiveDate=Date.today()
                    ,Status='Draft'
                    ,Pricebook2Id = o.Pricebook2Id
                    );
                insert odr;
                //copy Opportunity line items to Order line items
                  List<OrderItem> newOrderProductsList = new List<OrderItem>();
    
        for (OpportunityLineItem item : currentOppLI) {
             newOrderProductsList.add(new OrderItem(
                    PricebookEntryId = item.PricebookEntryId,
                    Quantity = item.Quantity,
                    UnitPrice = item.UnitPrice,
                    Description = item.Description,
                    OrderId = odr.Id));
         }
             insert newOrderProductsList;  

 List<OpportunityLineItem> newOppLI = new List<OpportunityLineItem>();
        
        for (OpportunityLineItem item : currentOppLI) {
             newOppLI.add(new OpportunityLineItem(
             PricebookEntryId = item.PricebookEntryId,   
             Quantity = item.Quantity,
             UnitPrice = item.UnitPrice,
             Description = item.Description,
             OpportunityId = opp.Id));
         }
            
    insert newOppLI;   


//opp is newly created opportunity and odr is newly created order

public class myclass{
 
    
    public Opportunity o;
    String theId = ApexPages.currentPage().getParameters().get('id');
  
    
   @TestVisible public List<WrapperSObject> records {get; set;}
    public Contract con {get; set;}
    public String selectedValue {get; set;}
  
  public  myclass(ApexPages.StandardController stdController) {
        this.o = (Opportunity)stdController.getRecord();
    }
     
    public PageReference autoRun() {
 
        String theId = ApexPages.currentPage().getParameters().get('id');
         if (theId == null) {
            return null;
        }
    
records = new List<WrapperSObject>();
 for (Contract c : [select id, Name, AccountId, StartDate, Status, ContractNumber from Contract where Status='Activated'  ])
 {
 records.add(new WrapperSObject(c, getOptions(), 'Activated'));
 }
     return null;
          
}
 public PageReference MainMethod() {
 
  try{
     //Create new Oppertunity
             Opportunity opp = new Opportunity(
                     Name = 'TESTACCOUNT_test july' +'Date.today()'
                     ,CloseDate=Date.today()
                     ,StageName= 'Renewal'
                     ,Type='EnerLead Renewal'
                     ,Description='Newly created Oppertunity' 
                );
            insert opp;
   
//try section     
}catch(QueryException e){
}catch(DMLException e){}
    
        return null;        
  }


// To Update contracts 
 public PageReference back() {
       List<Contract> contractToBeUpdate = new List<Contract>();
    for(WrapperSObject wrapper : records){
        wrapper.con.status = wrapper.selectedValue;
        contractToBeUpdate.add(wrapper.con);
    }
    update contractToBeUpdate;
    PageReference pageRef ;    
     return pageRef= MainMethod();
  }
 


@TestVisible public class WrapperSObject {
public Contract con {get; set;}
 public List < SelectOption > options {get; set;}
        public String selectedValue {get; set;}
  
     
    public WrapperSObject( Contract c,List < SelectOption > options, String selectedValue) {
    con=c;
     this.options = options;
     this.selectedValue = selectedValue;
     }
  
  }

public List < SelectOption > getOptions() {
List<SelectOption> options = new List<SelectOption>();
        options.add(new SelectOption('Activated','Activated'));
        options.add(new SelectOption('Expired','Expired'));
        options.add(new SelectOption('LAPSE','Lapse'));
        return options;
    }
  }

@isTest
private class myclassTest {
    private static testMethod void testAutoRun() {

    
        Account acc = new Account(Name='Abce');
  insert acc;
 
  Opportunity  testOppty = new Opportunity();
  testOppty.name='testOppty';
  testOppty.AccountId=acc.id;
  testOppty.CloseDate=System.today();
  testOppty.StageName= 'Closed Won';
  testOppty.Type='EnerLead Renewal';
  testOppty.Description='Newly created Oppertunity';
  insert testOppty;
  
        insert odr;
                  Contract c = new Contract(
                ,StartDate=testOppty.CloseDate
                ,AccountId = testOppty.AccountId
                ,Name = testOppty.Name
                );
            insert c;
  
  
        
        test.startTest();
        
            PageReference pageRef = Page.myclass;
            Test.setCurrentPage(pageRef);
            
            pageRef.getParameters().put('id',testOppty.id);
            ApexPages.StandardController sc = new ApexPages.standardController(testOppty);
            
            myclass  controller = new myclass(sc);
            controller.autoRun();
            controller.back();
            controller.MainMethod();
        test.stopTest();
}
}

public class myclass{
 
    
    public Opportunity o;
    String theId = ApexPages.currentPage().getParameters().get('id');
    List<OpportunityContactRole> oppRoles;
    Contract[] myContract;
    Opportunity[] myOpportunity;
    
    
    public List<WrapperSObject> records {get; set;}
    public Contract con {get; set;}
    public String selectedValue {get; set;}
    public  myclass(ApexPages.StandardController stdController) {
        this.o = (Opportunity)stdController.getRecord();
    }
     
    public PageReference autoRun() {
 
        String theId = ApexPages.currentPage().getParameters().get('id');
         if (theId == null) {
            return null;
        }
       o=[select id, name, AccountId,  StageName, Type, CloseDate from Opportunity where id =:theId];
 
records = new List<WrapperSObject>();
 for (Contract c : [select id, Name, AccountId, StartDate, Status, ContractNumber from Contract where Status='Activated'  ])
 {
 records.add(new WrapperSObject(c, getOptions(), 'Activated'));
 }
     return null;
          
}
 public PageReference MainMethod() {
 
  try{
       o=[select id, name, AccountId,  StageName, Type, CloseDate from Opportunity where id =:theId];
 
             
             //Create the contract
            Contract c = new Contract(
                ,StartDate=o.CloseDate
                ,AccountId = o.AccountId
                ,Name = o.Name
                );
            insert c;
       
       
       //copy contact roles

            oppRoles = [SELECT Id, OpportunityID, ContactID, IsPrimary, Role FROM OpportunityContactRole WHERE OpportunityId = :theId LIMIT 10000];
             myContract = [SELECT Id, ContractNumber, StartDate, EndDate,
                           AccountId, ContractTerm, Status, CustomerSignedId FROM Contract WHERE Id = :c.Id LIMIT 1];
             
             if ( ! oppRoles.isEmpty()) {
                    myContract[0].CustomerSignedId = oppRoles.get(0).ContactId;
              }  
              
              if ( ! oppRoles.isEmpty()){
                    List<ContractContactRole> conRoles = new List<ContractContactRole>();
                      
                      for (OpportunityContactRole oppRole : oppRoles)
                        { 
                             conRoles.add(new ContractContactRole(
                             ContactId = oppRole.ContactId,
                             IsPrimary = oppRole.IsPrimary,
                             Role = oppRole.Role,
                             ContractId = myContract[0].Id));                       
                         }
                         insert conRoles;
              }
                
     //Create new Oppertunity
             Opportunity opp = new Opportunity(
                     Name = 'TESTACCOUNT_test july' +'Date.today()'
                     ,CloseDate=Date.today()
                     ,StageName= 'Renewal'
                     ,Type='EnerLead Renewal'
                     ,Description='Newly created Oppertunity'
                     ,Product_Family__c='EnerLead' 
                );
            insert opp;
        //Copy roles of old opportunity to new
            
             myOpportunity = [SELECT Id, StageName, Type FROM Opportunity WHERE Id = :opp.Id LIMIT 1];
             
          
              
              if ( ! oppRoles.isEmpty()){
                    List<OpportunityContactRole> newoppRoles = new List<OpportunityContactRole>();
                      
                      for (OpportunityContactRole oppRole : oppRoles)
                        { 
                             newoppRoles.add(new OpportunityContactRole(
                             ContactId = oppRole.ContactId,
                             IsPrimary = oppRole.IsPrimary,
                             Role = oppRole.Role,
                             OpportunityId = myOpportunity[0].Id));                       
                         }
                         insert newoppRoles;
              
              }          
   
//try section     
}catch(QueryException e){
      ApexPages.Message msg = new Apexpages.Message(ApexPages.Severity.Warning,'Something is wrong' );
      ApexPages.addmessage(msg);
}catch(DMLException e){}
    
        return null;        
  }


// To Update contracts 
 public PageReference back() {
       List<Contract> contractToBeUpdate = new List<Contract>();
    for(WrapperSObject wrapper : records){
        wrapper.con.status = wrapper.selectedValue;
        contractToBeUpdate.add(wrapper.con);
    }
    update contractToBeUpdate;
    PageReference pageRef ;    
     return pageRef= MainMethod();
  }
 


public class WrapperSObject {
public Contract con {get; set;}
 public List < SelectOption > options {get; set;}
        public String selectedValue {get; set;}
  
     
    public WrapperSObject( Contract c,List < SelectOption > options, String selectedValue) {
    con=c;
     this.options = options;
     this.selectedValue = selectedValue;
     }
  
  }

public List < SelectOption > getOptions() {
List<SelectOption> options = new List<SelectOption>();
        options.add(new SelectOption('Activated','Activated'));
        options.add(new SelectOption('Expired','Expired'));
        options.add(new SelectOption('LAPSE','Lapse'));
        return options;
    }
  
     

}

@isTest
private class myclassTest {
    private static testMethod void testAutoRun() {

    
        Account acc = new Account(Name='Abce');
  insert acc;
 
  Opportunity  testOppty = new Opportunity();
  testOppty.name='testOppty';
  testOppty.AccountId=acc.id;
  testOppty.CloseDate=System.today();
  testOppty.StageName= 'Closed Won';
  testOppty.Type='EnerLead Renewal';
  testOppty.Description='Newly created Oppertunity';
  testOppty.Product_Family__c='EnerLead'; 
  insert testOppty;
  
        //Create the Order
                    Order odr = new Order(  
                    OpportunityId=testOppty.id
                    ,AccountId = testOppty.AccountId
                    ,Name = testOppty.Name
                    ,EffectiveDate=Date.today()
                    ,Status='Draft'
                    );
        insert odr;
                  Contract c = new Contract(
                ,StartDate=testOppty.CloseDate
                ,AccountId = testOppty.AccountId
                ,Name = testOppty.Name
                );
            insert c;
  
  
        
        test.startTest();
        
            PageReference pageRef = Page.myclass;
            Test.setCurrentPage(pageRef);
            
            pageRef.getParameters().put('id',testOppty.id);
            ApexPages.StandardController sc = new ApexPages.standardController(testOppty);
            
            myclass  controller = new myclass(sc);
            controller.autoRun();
            controller.back();
            controller.MainMethod();
        test.stopTest();
}
}

• "copying contact roles from old to new opportunity and contract"
• "Wrapper class and last getoptions() selection method"?

String theId = ApexPages.currentPage().getParameters().get('id');
List<OpportunityContactRole> oppRoles;
oppRoles = [SELECT Id, OpportunityID, ContactID, IsPrimary, Role FROM OpportunityContactRole WHERE OpportunityId = :theId LIMIT 10000];
            
//copying contact roles of old opportunity to new opportunity

if ( ! oppRoles.isEmpty()){
                    List<ContractContactRole> conRoles = new List<ContractContactRole>();
                      
                      for (OpportunityContactRole oppRole : oppRoles)
                        { 
                             conRoles.add(new ContractContactRole(
                             ContactId = oppRole.ContactId,
                             IsPrimary = oppRole.IsPrimary,
                             Role = oppRole.Role,
                             ContractId = myContract[0].Id));                       
                         }
                         insert conRoles;
              }
// myContract[0] is also defined and working fine,  code will become long so  here not mentioned, 
/// also copying the contact roles of opportunity to newly created contract

if ( ! oppRoles.isEmpty()){
                    List<ContractContactRole> conRoles = new List<ContractContactRole>();
                      
                      for (OpportunityContactRole oppRole : oppRoles)
                        { 
                             conRoles.add(new ContractContactRole(
                             ContactId = oppRole.ContactId,
                             IsPrimary = oppRole.IsPrimary,
                             Role = oppRole.Role,
                             ContractId = myContract[0].Id));                       
                         }
                         insert conRoles;
              }

<apex:page standardController="Opportunity"
 extensions="Opp2Order"
 action="{!autoRun}">
  
  <apex:form >

<apex:pageBlock title="My Active Contracts" > 
        <apex:pageBlockTable value="{!records}"  var="wrapper"> 
             <apex:column > 
                <apex:facet name="header">Contract Number</apex:facet> 
                <apex:outputText value="{!wrapper.con.ContractNumber}"/> 
            </apex:column> 
            <apex:column > 
                <apex:facet name="header">Contract ID</apex:facet> 
                <apex:outputText value="{!wrapper.con.id}"/> 
            </apex:column> 
            
            <apex:column > 
                <apex:facet name="header">Change Status</apex:facet> 
                <apex:selectList value="{!wrapper.selectedValue}" size="1" onchange="changeStatus()" >
                            <apex:selectOptions value="{!wrapper.options}" />  
                        </apex:selectList>
                        
           </apex:column> 
              </apex:pageBlockTable>    
         </apex:pageBlock> 
  <apex:commandButton action="{!back}" value="Save!" />
  
    </apex:form>
  
  
</apex:page>

public class Opp2Order {
 
    
    String theId = ApexPages.currentPage().getParameters().get('id');
    
    
    public List<WrapperSObject> records {get; set;}
    public Contract con {get; set;}
    public String selectedValue {get; set;}
 
   public Opp2Order(ApexPages.StandardController stdController) {
        this.o = (Opportunity)stdController.getRecord();
    }
     
    public PageReference autoRun() {
  records = new List<WrapperSObject>();
 for (Contract c : [select id, Name, AccountId, StartDate, Status, ContractNumber from Contract where Status='Activated'])
 {
 records.add(new WrapperSObject(c, getOptions(), 'Activated'));
 }

             return null;         
}

 public PageReference back() {
  // How to here update the status of all contracts 
  }
 
 public void changeStatus()
 {
    // in back() method or in this method ? I am confused
 }

public class WrapperSObject {
public Contract con {get; set;}
 public List < SelectOption > options {get; set;}
        public String selectedValue {get; set;}
  
     
    public WrapperSObject( Contract c,List < SelectOption > options, String selectedValue) {
    con=c;
     this.options = options;
     this.selectedValue = selectedValue;
     }
  
  }

public List < SelectOption > getOptions() {
List<SelectOption> options = new List<SelectOption>();
        options.add(new SelectOption('Activated','Activated'));
        options.add(new SelectOption('Expired','Expired'));
        options.add(new SelectOption('LAPSE','Lapse'));
        return options;
    }
}

I want to update the status of all contracts according to selection in VF page. How to get selected value from VF pick list and how to use in Apex class. 

I am confused wether i can pick selected value and update contract status in Onchange() method or in back() method i should update the status of all contracts. How i am supposed to do that. I am stucked badly. Guy's help.  
 

public class myclass {
 
    
    String theId = ApexPages.currentPage().getParameters().get('id');
    
    
    public List<WrapperSObject> records {get; set;}
    public Contract con {get; set;}
    
    public myclass(ApexPages.StandardController stdController) {
        this.o = (Opportunity)stdController.getRecord();
    }
     
    public PageReference autoRun() {
  
 records = new List<WrapperSObject>();
 for (Contract c : [select Name, AccountId, StartDate, Status, ContractNumber from Contract where Status='Pending'])
 {
 records.add(new WrapperSObject(c));
 records.add(new WrapperSObject(getOptions(), '--None--'));
}

             return null;
          
}

 

public class WrapperSObject {
public Contract con {get; set;}
 public List < SelectOption > options {get; set;}
        public String selectedValue {get; set;}
  
      
    public WrapperSObject( List < SelectOption > options, String selectedValue) {
    
     this.options = options;
     this.selectedValue = selectedValue;

     }
     public WrapperSObject(Contract c) {
     con=c;
     }
     
     
  }

public List < SelectOption > getOptions() {
List<SelectOption> options = new List<SelectOption>();
        options.add(new SelectOption('Expired','Expired'));
        options.add(new SelectOption('LAPSE','Lapse'));
        return options;
    }

}

<apex:page standardController="Opportunity"
 extensions="myclass"
 action="{!autoRun}">
  
  <apex:form >

<apex:pageBlock title="My Pending Contracts"> 
        <apex:pageBlockTable value="{!records}"  var="wrapper"> 
             <apex:column > 
                <apex:facet name="header">Contract Number</apex:facet> 
                <apex:outputText value="{!wrapper.con.ContractNumber}"/> 
            </apex:column> 
            <apex:column > 
                <apex:facet name="header">Contract Name</apex:facet> 
                <apex:outputText value="{!wrapper.con.Status}"/> 
            </apex:column>
            
            <apex:column > 
                <apex:facet name="header">Change Status</apex:facet> 
                <apex:selectList value="{!wrapper.selectedValue}" size="1" >
                            <apex:selectOptions value="{!wrapper.options}" />
                        </apex:selectList>
            </apex:column>
                       
        </apex:pageBlockTable>
        
    </apex:pageBlock> 
    </apex:form>
    
   
  
 </apex:page>

public class myclass {
 
    
    String theId = ApexPages.currentPage().getParameters().get('id');
    
    
    public List<WrapperSObject> records {get; set;}
    public Contract con {get; set;}
    
    public myclass(ApexPages.StandardController stdController) {
        this.o = (Opportunity)stdController.getRecord();
    }
     
    public PageReference autoRun() {
  
 records = new List<WrapperSObject>();
 for (Contract c : [select Name, AccountId, StartDate, Status, ContractNumber from Contract where Status='Pending'])
 {
 records.add(new WrapperSObject(c));
 records.add(new WrapperSObject(getOptions(), '--None--'));
}

             return null;
          
}

 

public class WrapperSObject {
public Contract con {get; set;}
 public List < SelectOption > options {get; set;}
        public String selectedValue {get; set;}
  
      
    public WrapperSObject( List < SelectOption > options, String selectedValue) {
    
     this.options = options;
     this.selectedValue = selectedValue;

     }
     public WrapperSObject(Contract c) {
     con=c;
     }
     
     
  }

public List < SelectOption > getOptions() {
List<SelectOption> options = new List<SelectOption>();
        options.add(new SelectOption('Expired','Expired'));
        options.add(new SelectOption('LAPSE','Lapse'));
        return options;
    }

}

<apex:page standardController="Opportunity"
 extensions="myclass"
 action="{!autoRun}">
  
  <apex:form >

<apex:pageBlock title="My Pending Contracts"> 
        <apex:pageBlockTable value="{!records}"  var="wrapper"> 
             <apex:column > 
                <apex:facet name="header">Contract Number</apex:facet> 
                <apex:outputText value="{!wrapper.con.ContractNumber}"/> 
            </apex:column> 
            <apex:column > 
                <apex:facet name="header">Contract Name</apex:facet> 
                <apex:outputText value="{!wrapper.con.Status}"/> 
            </apex:column>
            
            <apex:column > 
                <apex:facet name="header">Change Status</apex:facet> 
                <apex:selectList value="{!wrapper.selectedValue}" size="1" >
                            <apex:selectOptions value="{!wrapper.options}" />
                        </apex:selectList>
            </apex:column>
                       
        </apex:pageBlockTable>
        
    </apex:pageBlock> 
    </apex:form>
    
   
  
 </apex:page>

Why this small blank Dropdown menu is showing ? 
How to fix this ?

Now how to change the status of these contracts ? I mean how to return the value "Expired or Lapse" and update crosponding Contract ? 

Guys ay help ?

I have a button in Opportuinty page which calls myclass, i am trying to show the contracts in visual force page, my controler is Opportunity type so now i am getting error when i try to access the "ContractNumber" in SObject Opportunity, But i need to use Opportunity controler.  NOw how should i access ContractNumber and Status in Visual force page. 
Here is my Visual force page. 

<apex:page standardController="Opportunity"
 extensions="myclass"
 action="{!autoRun}">
  
<apex:pageBlock title="My  Contracts"> 
        <apex:pageBlockTable value="{!Records}"  var="Record"> 
            <apex:column > 
                <apex:facet name="header">Contract Name</apex:facet> 
                <apex:outputText value="{!Record.Name}"/> 
            </apex:column> 
             <apex:column > 
                <apex:facet name="header">Contract Number</apex:facet> 
                <apex:outputText value="{!Record.ContractNumber}"/> 
            </apex:column> 
           <apex:column > 
                <apex:facet name="header">Contract Status</apex:facet> 
                <apex:outputText value="{!Record.Status"/> 
            </apex:column> 
          </apex:pageBlockTable> 
    </apex:pageBlock> 
</apex:page>

public class  myclass {
 
    
    String theId = ApexPages.currentPage().getParameters().get('id');
    public List<Contract> Records {get; set;}

   public myclass(ApexPages.StandardController stdController) {
        this.o = (Opportunity)stdController.getRecord();
    }
     
    public PageReference autoRun() {
 Records = [select Name, AccountId, StartDate, Status, ContractNumber from Contract where Status='Pending']; 
 return null;
 }

<apex:page standardController="Opportunity"
 extensions="myclass"
 action="{!autoRun}">
</apex:page>

public class myclass {
    private final Opportunity o;
    String tmp;
   public myclass(ApexPages.StandardController stdController) {
        this.o = (Opportunity)stdController.getRecord();
    }
    public PageReference autoRun() {
        String theId = ApexPages.currentPage().getParameters().get('id');
 
        for (Opportunity o:[select id, name, AccountId,  from Opportunity where id =:theId]) {
 
                 //Create the Order
                    Order odr = new Order( 
                    OpportunityId=o.id
                    ,AccountId = o.AccountId
                    ,Name = o.Name
                    ,EffectiveDate=Date.today()
                    ,Status='Draft'
                    );
                insert odr;
                tmp=odr.id;            
              }                 
        PageReference pageRef = new PageReference('/' + tmp); 
        pageRef.setRedirect(true);
        return pageRef;
      }
}

I am new to apex, I have created a button to call the apex class through the visual force page. 

Here is my visual force page code. 

<apex:page standardController="Opportunity"
 extensions="myclass"
 action="{!autoRun}">
</apex:page>

public class myclass {
    private final Opportunity o;
    String tmp;
    
   public myclass(ApexPages.StandardController stdController) {
        this.o = (Opportunity)stdController.getRecord();
    }
    public PageReference autoRun() { 
        String theId = ApexPages.currentPage().getParameters().get('id');

        for (Opportunity o:[select id, name, AccountId,  from Opportunity where id =:theId]) {

                 //Create the Order
                    Order odr = new Order(  
                    OpportunityId=o.id
                    ,AccountId = o.AccountId
                    ,Name = o.Name
                    ,EffectiveDate=Date.today()
                    ,Status='Draft'
                    );
                insert odr;
                tmp=odr.id;             
              }                  
        PageReference pageRef = new PageReference('/' + tmp);  
        pageRef.setRedirect(true);
        return pageRef;
      }
}