I am trying to assign value to a controller variable using assignTo attribute of apex:param component as shown below

<apex:page controller="PageRefController">
<apex:form >
    <apeX:pageBlock title="Contacts">
        <apex:dataTable value="{!contacts}" var="con" cellpadding="4" border="1">
            <apex:column >
                <apex:facet name="header">Name</apex:facet>
                <apex:commandLink action="{!redirPage}">
                    <apex:param assignTo="{!name}" value="{!con.FirstName}" />
            <apex:column >
                <apeX:facet name="header">Phone</apex:facet>

public class PageRefController {
    public String name{get;set;}
    public List<Contact> getContacts(){
        return [Select firstname,phone from Contact limit 5];
    public PageReference redirPage(){
        PageReference pg = new PageReference('/apex/TestPageRefEx?'+'name='+name);
        return pg;

But my controller variable name is set to null with the above code snippet.However,if I use name attribute inside apex:param

<apex:param assignTo="{!name}" value="{!con.FirstName}" name="abc"/>

the value is set properly. Can anyone please explain this behavior ?

1 Answer 1


It is sent to salesforce as a name,value pair. If it doesn't have a name, it isn't available. It is not required because <apex:param> has other uses to like in <apex:outputText>. The value is therefore the only required field.

  • 4
    +1.Nice answer and common problem developers suffer from.Compiler allows to compile and then we wonder whats going on Commented Oct 30, 2013 at 9:28

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