AJAX + JQuery synchronization issue

Question

From another method I am calling the method below, the problem is its always returning 0 while data[4] is not 0. If javascript is single threaded how come there is a synchronization problem here? if not can you please explain and suggest a fix.

function GetVMData(url_s){
    var cpu_USG = 0;
    $.ajax({
           url: url_s,
           crossDomain: true, 
           dataType: 'jsonp',
           success: function(data) {
                   cpu_USG = data[4];
           },
           error: function(xhr, status, error) { 
               alert('failed')
            } 
       });
    return cpu_USG;
}

zerkms · Accepted Answer · 2012-08-23 00:27:22Z

2

You may use jquery deferreds:

// the function definition
function GetVMData(url_s){
    return $.ajax({
           url: url_s,
           crossDomain: true, 
           dataType: 'jsonp',
           error: function(xhr, status, error) { 
               alert('failed')
            } 
       }).pipe(function(data) { return data[4]; });
}

// function call example
GetVMData('some url').done(function(cpu_USG) {
    alert(cpu_USG);
});

This solution is MUCH better than making ajax request synchronous.

answered Aug 23, 2012 at 0:27

zerkms

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