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Populate value on a VF page

I want to populate Manager's Name for the user selected in a lookup field in VF page ..

When user select EmpName -  Lookup field to user on VF apge,

I want to populate its corresponding manager's name..


Kindly suggest



VF page :


<apex:column headerValue="QC/DM Name">
<apex:inputField value="{!obj.dsObj.EmpName}" rendered="{!NOT(obj.isSummaryRecord) && NOT(obj.isFirstRecord)}"/>
<apex:outputLabel value="" style="text-align:right; font-weight: bold;" rendered="{!obj.isSummaryRecord}"/>
<apex:OutputField value="{!obj.dsObj.EmpName}" rendered="{!NOT(obj.isSummaryRecord)&& (obj.isFirstRecord)}"/>
<apex:actionsupport event="onchange" action="{!SelectManager}" rerender="!obj.isSummaryRecord, mgrName" status="waitingStatus"/>
<apex:param name="UsrId" value="{!obj.dsObj.EmpName}" assignTo="{!UsrId}"/>


<apex:column headerValue="Manager Name" id="mgrName">
<apex:OutputField value="{!obj.dsObj.Manager__c}" rendered="{!NOT(obj.isSummaryRecord)}"/>



Controller Class :


public PageReference SelectManager()
String UsrId;
String UsrName ;
User usr = [Select Id, Name , Reports_To__c from User where IsActive = true and Id =: UsrId Limit 1];
UsrName = usr.Reports_To__c ;
return Null;