Cross Browser Ajax (success_function needs tweaking)

cross-browser-ajax.js

!(function ($){

    "use strict";

    window.FF_AJAX = {};
    var FF      = window.FF_AJAX;

    /* ================================================================ */
    /*                                                                  */
    /*                     CROSS BROWSER AJAX                           */
    /*                                                                  */
    /* ================================================================ */


    FF.isIE8orIE9 = function() {
        return !!( ( (/msie 8./i).test(navigator.appVersion) || (/msie 9./i).test(navigator.appVersion)  ) && !(/opera/i).test(navigator.userAgent) && window.ActiveXObject && XDomainRequest && !window.msPerformance );
    };

    FF.make_ajax_request = function(url, data, success_function){
        if( data === undefined ){ return false;}
        var result;
        if ( FF.isIE8orIE9() ) {
            var xdr = new XDomainRequest();
            xdr.open("post", url);
            xdr.onerror = function() {
                FF.display_errors(response.error);
            }
            xdr.ontimeout = function() { /* only needed for IE9 support */ }
            xdr.onprogress = function() { /* only needed for IE9 support */ }
            xdr.onload = function() {
                var dom = new ActiveXObject("Microsoft.XMLDOM");
                dom.async = false;
                dom.loadXML(xdr.responseText);
                var response = JSON.parse(dom.parseError.srcText);
                if(response.success){ FF.handle_response(xdr.responseText, success_function); }
                else{ FF.handle_response(xdr.responseText, success_function, true); }
            };
            xdr.send(jQuery.param(data));
        }
        else {
            result = jQuery.ajax({
                'type'       : 'post',
                'url'        : url,
                'data'       : data,
                'async'      : false,
                'error'      : function(response) { FF.handle_response(response, success_function, true); },
                'success'    : function(response) { FF.handle_response(response, success_function); }
            })
        }
    };

    FF.display_errors = function(message){
        if( typeof(message) != 'string' ){
            alert("Error\n\nRemote Connection Error");
        }
        else {
            alert( "Error\n\n" + message );
        }
    };

    FF.handle_response = function(response, success_function, error){
        if(success_function === undefined){success_function = null;}
        if(error === undefined){error = false;}
        try{
            var r = JSON.parse(response);
        }
        catch(e){
            var r = response;
        }
        if(error){
            console.log('success', response);
            if( typeof(r.error) == 'undefined' ){console.log(response);r = {};r.error = {};r.error.message = 'unknown error';}
            else if( r.error.message === undefined ){console.log(r);r.error.message = r.error;}
            //FF.display_errors(r.error.message);
        }
        else{
            if( success_function ){ eval(success_function); }
        }
    };

})(jQuery);