Use of ActionRegion,rerender,Param and Id

Controller Code :-

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public class ActionReson3{ public List<opportunity> opplist{get;set;} public opportunity opp_var{get;set;} Public id Recid{get;set;} public boolean ShowHide {get;set;} public ActionReson3() { ShowHide=False; opplist = [SELECT ID, Name,closedate FROM opportunity limit 5] ; } public void getRecordID() { showHide= True; opp_var= [select name, accountid,closedate,ForecastCategoryName,Amount,leadsource from opportunity where id=:Recid ]; } }

Visualforce Page :-

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<apex:page controller="ActionReson3"> <apex:form > <apex:pageblock Title="List of Opportunity"> <apex:pageblockTable value="{!opplist}" var="opp"> <apex:column headerValue="Opportunity Name"> <apex:actionregion > <apex:commandLink action="{!getRecordID}" value="{!opp.name}" rerender="pb" > <apex:param assignTo="{!Recid}" name="testuser" value="{!opp.id}"/> </apex:commandLink> </apex:actionregion> </apex:column> <apex:column headerValue="Close Date"> <apex:outputLink value="/{!opp.id}" >{!opp.closedate}</apex:outputLink> </apex:column> </apex:pageblockTable> </apex:pageblock> <apex:pageBlock rendered="true" id="pb" > <apex:pageBlockSection > <apex:outputField value="{!opp_var.name}" /> <apex:outputField value="{!opp_var.accountid}"/> <apex:outputField value="{!opp_var.closedate}"/> <apex:outputField value="{!opp_var.ForecastCategoryName}"/> <apex:outputField value="{!opp_var.Amount}"/> <apex:outputField value="{!opp_var.leadsource}"/> </apex:pageBlockSection> </apex:pageBlock> </apex:form> </apex:page>

OutPut Screen :-