Question

Is it possible to retrieve variable set in onreadystatechange function from outside the function?
–edit–
Regarding execution of functions:
If its possible i would like to execute ajaxFunction() with one click
and then popup() with next click, or somehow wait for ajax function to end and then call for alert box

In pseudocode:

function ajaxFunction(){     //creating AJAX      ...     // Create a function that will receive data sent from the server     ajaxRequest.onreadystatechange = function (){         if(ajaxRequest.readyState == 4){             //success code             ======>Here i want to set variable <=====             var MyVariable='MyContent';         }     }     //Retrieving page     .... }  function popup(){     ajaxFunction();     alert(MyVariable); } 

Answer 1

The following code assumes that the ajax-request is synchronous:

function popup(){     ajaxFunction();     alert(MyVariable); } 

But since synchronous requests are blocking the browser you should in almost all cases use asynchronous calls (If I remember correctly onreadystatechange should not be called on synchronous request but different browsers behaves differently)

What you could do is:

function ajaxFunction(callback){     //creating AJAX       ...     // Create a function that will receive data sent from the server     ajaxRequest.onreadystatechange = function (){         if(ajaxRequest.readyState == 4){             //success code             callback('MyContent')         }     }     //Retrieving page      .... }  function popup() {   ajaxFunction(function(MyVariable){alert(MyVariable);); }