Auto Populate visualforce Page Fieldvalues on the basis of lookup fields

Sometimes  requirements comes  when user want to Auto Populate visualforce Page Fieldvalues when  select  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 support  function on lookup field  (the field on change of which we want to autopopulate values)
3.   We call a controller method  using actionsupport
4.  rerender page using action support

Create a Visualforce page having input fields and lookup fields .

<apex:page standardController="Services__c" extensions="ServiceExtController" id="pageId">
    <apex:form id="formId">
        <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:inputField value="{!ser.Name}" taborderhint="1" />
                <apex:inputField value="{!ser.Type__c}" taborderhint="4"/>
                <apex:inputField value="{!ser.SKU__c}" taborderhint="2">
                    <apex:actionSupport event="onchange" action="{!getautopopultevalue}" />
    	         </apex:inputField>
                
                <apex:inputField value="{!ser.Hourly_Amount__c}" taborderhint="5"/>
                <apex:pageblockSectionItem >
                    <apex:outputLabel > Proposal </apex:outputLabel>
                    <apex:outputPanel >
                        <div class="requiredInput">
                            <div class="requiredBlock"></div>
                            <apex:inputField value="{!ser.Proposal__c}" required="false" taborderhint="3"/>
                        </div>
                    </apex:outputPanel>
                </apex:pageblockSectionItem>
            </apex:pageBlockSection> 
            <apex:pageBlockSection columns="1"> 
                <apex:pageblockSectionItem />
          <apex:inputField value="{!ser.Description__c}" taborderhint="6"/>
            </apex:pageBlockSection>
        </apex:pageBlock>
    </apex:form>
</apex:page>

Controller class :  

public class ServiceExtController {
    public Services__c ser {get;set;}
    public ServiceExtController (ApexPages.StandardController stdController){
        this.ser = (Services__c)stdController.getRecord();
    }  
  
    public void getautopopultevalue(){
       
        // checking lookup field is not null
        if( ser.SKU__c != null ){
            
           // fetching values from sku object we need to autopopulate sku values on our vf page 
            SKU__c skuValue =  [select Id,Name,Long_description__c,Price__c,Short_Description__c,Type__c from SKU__c 
                                where Id =: ser.SKU__c limit 1];
            
           
            // assigning value to ser that is of type service. ser is get set variable of our vf page 
            
            ser.Type__c = skuValue.Type__c;
            ser.Description__c = skuValue.Long_description__c;
            ser.Hourly_Amount__c = skuValue.Price__c;
        }else{
            ser.Type__c = '';
            ser.Description__c = '';
            ser.Hourly_Amount__c = null;
        }
    }
}

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