some events u mentioned in the code are for what purpose..like event in command button and one more event in <Apex:form> component

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Shashikant Sharma wrote:

Hi Ankita,

 

Wrapper class is some kind of Apex Class Object Type. There are situations when we need to create a list of items which are of various type.

In Apex List can only contain a single type of items like List<Account> , List<Contact> , if I want to have both items then I would create a wrapper class like

 

Basic Structure

 

public class outerClass {
public List<innerWrapperClass> wrapperList {get;set;}

public outerClass()
{
      wrapperList .add(new innerWrapperClass(new Account(Name ='Acc') , new Contact(lastName = 'Con'));
}

public class innerWrapperClass{
public Account a{get;set;}
public Contact c{get;set;}

public innerClass(Account a , Contact c)
{
    this.a = a;
    this.c = c;
}

}
}

 

 Example : When ever you want to show a check box in a table of any list of items you will require wrapper class, like in this example we will show some record on page 1 and user will select some and will click on nextpage button and on page2 we will show only selected records

 

Apex Class :

 

public class demoClass1 {

public demoClass1()
    {
    
        listContactWrapper  = new  List<contactWrapper>(); 
        for(Contact c : [Select Name , Email from Contact limit 20])
            listContactWrapper.add(new contactWrapper(c));
    }


public PageReference previouspage()
    {
        addTextrBox c = new addTextrBox();
        //c.addTextrBox1();
        return new PageReference(Page.page1.getUrl());
        
        
    }
public PageReference nextpage()
    {
        return new PageReference(Page.page2.getUrl());
    }
    
public List<contactWrapper> listContactWrapper {get;set;}
public class contactWrapper
   {
      public Contact c {get;set;}
      public Boolean isChecked {get;set;}
      public contactWrapper(Contact c)
          {
              this.c = c;
              if(isChecked == null)
                  isChecked = false;
              
          } 
   }

}

 

 

Page1

<apex:page controller="demoClass1">
    <apex:form >
    
    
     <apex:pageBlock id="PageBlockId" title="Test Wrapper Class">
         
         <apex:pageBlockButtons >
             <apex:commandButton value="Next Page" action="{!nextpage}" onclick="return openWindow();"/>
         </apex:pageBlockButtons>
         <apex:pageBlockSection >
         
             <apex:pageBlockTable value="{!listContactWrapper}" var="item">
                 
                 <apex:column >
                     <apex:inputCheckbox value="{!item.isChecked}"/>
                 </apex:column>
             
                  <apex:column value="{!item.c.Name}"/>
                  <apex:column value="{!item.c.Email}"/> 
             </apex:pageBlockTable>
             
         </apex:pageBlockSection>
     
     </apex:pageBlock>
     </apex:form>
</apex:page>
 

 

 

Page 2

<apex:page controller="demoClass1" >
    <apex:form onmouseout="closeWindow();">
    
     <apex:pageBlock >
         <apex:pageBlockButtons >
             <apex:commandButton value="Previous Page" action="{!previouspage}"/>
         </apex:pageBlockButtons>
         <apex:pageBlockSection >
         
             <apex:pageBlockTable value="{!listContactWrapper}" var="item">
                  <apex:column value="{!item.c.Name}" rendered="{!item.isChecked}"/>
                  <apex:column value="{!item.c.Email}" rendered="{!item.isChecked}"/> 
             </apex:pageBlockTable>
             
         </apex:pageBlockSection>
     
     </apex:pageBlock>
     </apex:form>
</apex:page>
              

 

 

I hope above example will help you.

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