IE8 Ajax Request always fails

[lenny87]

Hi all,

New to using Ext and have come across an issue with Ext Ajax requests and IE8. A very simple GET or POST request within IE8 always returns as a failure. However the same code returns success in firefox, safari and even GET requests work fine in IE9.

Is there anything I am missing? Below is my very simple Ajax request.

 Ext.Ajax.request(
            {
                url: '/php/TestIEReq.php',
                method: "GET",
                success: function(response)
                {
                    Ext.Msg.alert("GET Status","Request was successful");
                },
                failure: function(response)
                {
                    Ext.Msg.alert("GET Status","Request was NOT successful");
                }
            }
        );

Any help would be much appreciated. Thanks in advance.

[lenny87]

Found the problem through testing other peoples IE Ajax examples. What I have found is that having Ext.Ajax.cors = true set in IE makes the AJAX requests not work properly.

Is this a bug in 4.1.1?

[mitchellsimoens]

IE has no or bad support for CORS. IE10 should have much better support.

[lenny87]

thanks for the response, does this mean we should abandon CORS for ie8? many of my clients still use it unfortunately.

[mitchellsimoens]

Yes, you will likely need to use JsonP instead which does require a little server side setup but it's super simple in most cases.

[lenny87]

thanks for the clarification mitchell. much appreciated