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rohitash yadavrohitash yadav 

Pass picklist selected value from visualforce page to apex class

Hi

I have some records listing on visualforce page . I want to filter these records based on selected value of custom picklist. I am not able to get selected value of this picklist in apex class.

My visualforce page is:
  
<apex:page standardController="Line_Item__c" extensions="LineItemPackagesExtensions" recordSetVar="lineitems" >
	<apex:pageBlock title="Search for Packages">
        	<apex:outputLabel >Packages Category</apex:outputLabel>
		<apex:inputField value="{!prdcat.Product_Category__c}" >
                	<apex:actionSupport event="onchange" rerender="packagesList" action="{!filterPackages}"/>
		</apex:inputField>
            	<apex:outputPanel id="packagesList">
                	<apex:pageBlockTable value="{!Packages}" var="a">
                    		<apex:column value="{!a.Name}"/>
                    		<apex:column value="{!a.Product_Category__c}"/>
                    		<apex:column value="{!a.Cost__c}"/>
                    		<apex:column value="{!a.Stay__c}"/>
                    		<apex:column value="{!a.Activity__c}"/>
                    		<apex:column value="{!a.Description__c}"/>
                	</apex:pageBlockTable>
           	</apex:outputPanel>
        </apex:pageBlock>
</apex:page>

Apex class is:
  
public class LineItemPackagesExtensions {

    public Package__c pkgs;
    public List<Package__c> Packages { get; set; }
    public Package__c prdcat{get;set;}
    


    public LineItemPackagesExtensions(ApexPages.StandardSetController controller) {
        Packages = [SELECT Name,Product_Category__c,Cost__c,Stay__c,Activity__c,Description__c FROM Package__c ];
    }

    public List<Package__c> getPackages(){
        Packages = [SELECT Name,Product_Category__c,Cost__c,Stay__c,Activity__c,Description__c FROM Package__c ];
        return Packages;
    }
    
    public void filterPackages() {
    	Packages = [SELECT Name,Product_Category__c,Cost__c,Stay__c,Activity__c,Description__c FROM Package__c 
           where Product_Category__c=:prdcat.Product_Category__c ];
    }

}

When I change the value of picklist it throws the following error

Attempt to de-reference a null object
Error is in expression '{!filterPackages}' in page addopportunitylineitem1: Class.LineItemPackagesExtensions.filterPackages: line 35, column 1


Please help to achieve this.
Thanks
Rohitash
Best Answer chosen by rohitash yadav
Michael DsozaMichael Dsoza
Hello Rohitash Yadav,

Initialize your package in controller before accessing it in UI. as it seems that you haven't initialized it.
  
public class LineItemPackagesExtensions {

    public Package__c pkgs;
    public List<Package__c> Packages { get; set; }
    public Package__c prdcat{get;set;}
    
   public LineItemPackagesExtensions() {
         prdcat = new Package__c();
   }

    public LineItemPackagesExtensions(ApexPages.StandardSetController controller) {
        Packages = [SELECT Name,Product_Category__c,Cost__c,Stay__c,Activity__c,Description__c FROM Package__c ];
    }

    public List<Package__c> getPackages(){
        Packages = [SELECT Name,Product_Category__c,Cost__c,Stay__c,Activity__c,Description__c FROM Package__c ];
        return Packages;
    }
    
    public void filterPackages() {
    	Packages = [SELECT Name,Product_Category__c,Cost__c,Stay__c,Activity__c,Description__c FROM Package__c 
           where Product_Category__c=:prdcat.Product_Category__c ];
    }

}

Hope it will help you.

Mark it as best answer if it resolves your query.

Thanks

All Answers

Michael DsozaMichael Dsoza
Hello Rohitash Yadav,

Initialize your package in controller before accessing it in UI. as it seems that you haven't initialized it.
  
public class LineItemPackagesExtensions {

    public Package__c pkgs;
    public List<Package__c> Packages { get; set; }
    public Package__c prdcat{get;set;}
    
   public LineItemPackagesExtensions() {
         prdcat = new Package__c();
   }

    public LineItemPackagesExtensions(ApexPages.StandardSetController controller) {
        Packages = [SELECT Name,Product_Category__c,Cost__c,Stay__c,Activity__c,Description__c FROM Package__c ];
    }

    public List<Package__c> getPackages(){
        Packages = [SELECT Name,Product_Category__c,Cost__c,Stay__c,Activity__c,Description__c FROM Package__c ];
        return Packages;
    }
    
    public void filterPackages() {
    	Packages = [SELECT Name,Product_Category__c,Cost__c,Stay__c,Activity__c,Description__c FROM Package__c 
           where Product_Category__c=:prdcat.Product_Category__c ];
    }

}

Hope it will help you.

Mark it as best answer if it resolves your query.

Thanks
This was selected as the best answer
rohitash yadavrohitash yadav
Hello Michael Dsoza,

Thanks, It is working now. I will let you know if I need more help to complete task further.

Thanks, 
Rohitash singh yadav