BlackBerry10 AJAX Fix via QML fix ajax calls via a QML gateway. see story here (fr) : http://www.haploid.fr/blog/2013/09/10/blackberry10-et-ajax/

qml_side.js

/* bind handleAjax native function to a message sent by the webview JavaScript 
   send result to webview
*/
WebView {
    id : webview
	onMessageReceived: {
	    try {
	        if (message && message.data) {
	            var jsonObj = JSON.parse(decodeURIComponent(message.data));
	            
	            switch (jsonObj.type){
	            	case "ajax":
	            		handleAjaxCall(jsonObj.options, function(params){
                            params.callbackID=jsonObj.callbackID;
                            //Send back the result to JS
							webView.postMessage(JSON.stringify(params));
						});
	            	break;
	            }
	        }
	    } catch (e) {
	        console.log('ERROR in received message: ' + e;
	    }
	}
}
/* mimics $.ajax jQuery methods on the native side
    and send a result as a JSON
*/
function handleAjaxCall(options,callback){
    var url= options.url;
	var type= (options.type in [ 'POST', 'GET' ]) ? options.type : "GET"; //default to GET
	var data = options.data ? options.data : {}; //default to empty params
	//add params to url if sending data through GET
	if (type=="GET"){
		url+="?"+serializeAjaxParams(options.data);
	}

	var request = new XMLHttpRequest();
	request.onreadystatechange=function() {
		if(request.readyState === XMLHttpRequest.DONE) {
			if (request.status === 200) {
				try{
					var response = JSON.parse(request.responseText);
				}catch(e){
					var response = request.responseText;
				}
				var params={
						success : true,
						data : response
				}
				callback(params);
			}
			else {
				// This is very handy for finding out why your web service won't talk to you
				console.log("Native Ajax Error " + request.status + ", " + request.statusText);
				var params = {
						error: true,
						status : request.status,
						statusText : request.statusText
				}
				callback(params);
			}
		}
	}
	var encodedString = encodeURIComponent(data);
	request.open(type, url, true); // only async supported
	// You might not need an auth header, or might need to modify - check web service docs
	//request.setRequestHeader("Authorization", "Bearer " + yourAccessToken);
	// Post types other than forms should work fine too but I've not tried
	request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	// Form data is web service dependent - check parameter format
	var requestString = "text=" + encodedString;
	request.send(requestString);
}
//returns the querystring encoding of a javascript object
//also converts recursive objects (using php "array" notation for the query string)
function serializeAjaxParams(obj, prefix) {
    var str = [];
    for(var p in obj) {
        var k = prefix ? prefix + "[" + p + "]" : p, v = obj[p];
        str.push(typeof v == "object" ? 
        		serializeAjaxParams(v, k) :
            encodeURIComponent(k) + "=" + encodeURIComponent(v));
    }
    return str.join("&");
}

webview_side.js

/*
    this is the webview side, add this in a script tag in your webview
*/
var lib=window.Zepto || window.jQuery;
if (lib){
    
	//store callbacks in an array
	var callbacks=[];	

	//replace $.ajax and send options to native	
	lib.ajax=function(options){
		//add a new callback to treat the result of the call
		callbacks.push(function(params){
			if (params.success && options.success){
				options.success(params.data);
	        }else if (params.error){
		    	options.error({ status:params.status, statusText:params.statusText });
			}			
		};
		navigator.cascades.postMessage(encodeURIComponent(JSON.stringify({
			type: "ajax",
			options : options
			callbackID : calbacks.length
		})));
		
	};
	
	//handler for messages sent from the nativeSide
	navigator.cascades.onmessage=function(jsonObj){
		if (jsonObj.callbackID && callbacks[jsonObj.callbackID]){
			//automatically call the result callback
			callbacks[jsonObj.callbackID](jsonObj);
		}else{
			//treat other messages from the native side	
		}
	}
		
}