Auto Populate visualforce page fieldvalues on the basis of lookup fields

Sometimes  Requirements comes when user want to Auto Populate visualforce page fieldvalues on the basis of lookup fields.

To solve this requirement we follow the below steps:

1. Create a Visualforce page having input fields and lookup fields .
2.   We use action function  on lookup field  (the field on change of which we want to autopopulate values)
3.   We call a controller method  using actionfunction
4.  rerender page using action functino

Create a Visualforce page having input fields and lookup fields .

<apex:page standardController="Services__c" extensions="ServiceExtController" id="pageId">
    <script>
     function getServiceData(){
         var skuId = document.getElementById("pageId:formId:pgBlkId:pgBlkSecId:skuId_lkid").value;
         console.log('value of skuid ',skuId);
         getServiceDataAF(skuId);
     }
    </script>
    <apex:form id="formId">
        <apex:actionFunction name="getServiceDataAF" action="{!getServiceData}" immediate="true" rerender="">
            <apex:param name="skuId" value="" assignTo="{!skuId}"/>
        </apex:actionFunction>
        <apex:pagemessages ></apex:pagemessages>
        <apex:pageBlock title="Service Edit" id="pgBlkId">
      <apex:pageBlockButtons>
         <apex:commandButton action="{!Save}" value="Save"/>
                		<apex:commandButton action="{!Cancel}" value="Cancel"/>
      </apex:pageBlockButtons>
      <apex:pageBlockSection title="Service Information" collapsible="false" id="pgBlkSecId">
        <apex:pageBlockSectionItem >
          <apex:outputText value="Name"/>
          <apex:outputPanel >
            <apex:inputField value="{!Services__c.Name}" style="margin-left:5px;"/>
          </apex:outputPanel>
        </apex:pageBlockSectionItem>
    			<apex:inputField value="{!Services__c.SKU__c}" id="skuId" onchange="getServiceData();"/>
    			<apex:inputField value="{!Services__c.Proposal__c}"/>
    			<apex:inputField value="{!Services__c.Hourly_Amount__c}"/>
          <apex:inputField value="{!Services__c.Description__c}"/>
    			<apex:inputField value="{!Services__c.Type__c}"/>
      
              
      </apex:pageBlockSection> 
        </apex:pageblock>
    </apex:form>
</apex:page>

Controller Class:

  public class ServiceExtController {
    
    public Services__c ser {get;set;}
   
    public string skuId{get;set;}
    public ServiceExtController (ApexPages.StandardController stdController) 
    {
         this.ser = (Services__c)stdController.getRecord();
    }
    
    public void getServiceData()
    {
        system.debug('skuId = '+skuId);
        
        SKU__c skuValue =  [select Id,Name,Long_description__c,Price__c,Short_Description__c,Type__c from SKU__c 
                        where id=: skuId limit 1];
        
        ser.Type__c = skuValue.Type__c;
        ser.Description__c = skuValue.Long_description__c;
        ser.Hourly_Amount__c = skuValue.Price__c;
    }
}

You can also Auto Populate visualforce page fieldvalues  by another approach by using action support insted of action function:

Note:  Action Function cannot render richtext area fields use action support  instead of action function

here is the link for another related post : http://himanshurana.in/auto-populate-visualforce-page-fieldvalues-on-the-basics-of-lookup-fields/

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