redirect to a page from apex in the constructor

Question

I have a method in the page constructor that checks if a user has access to the page. If not, I want to redirect the user to another "Access Denied" page. I know I can use Pagereferences as part of a VF page and return to the page. But since I do my validation in the constructor, I cannot do that. Any solutions to resolve the issue?

Answer 1

You can't redirect from constructor so you need to use the apex:page action attribute for that.

<apex:page controller="YOURCONTROLLERNAME" action="{!YOURMETHODNAME}">
</apex:page>

Your Apex Method:

 public PageReference validateAndRedirect(){

      //Write your logic here and redirect
      PageReference retURL = new PageReference('REDIRECT URL');
      retURL.setRedirect(true);
      return retURL;

 }

Answer 2

use <apex:page> action attribute to call pagereference method

VF page.

<apex:page controller="myCtrl" action="{!pageReferenceMethod}">


</apex:page>

Class

public class myCtrl{

    public myCtrl()
    {

    }

    public PageReference pageReferenceMethod()
    {
          return new PageReference('/001');
     }

}