Call JSONP

call_jsonp.js

function callJsonp(url, callbackFunc){
	var callbackName;
	
	if (callbackFunc == null || callbackFunc.length == 0){
		callbackName = "dummy";
	}
	else if (typeof(callbackFunc) == "function"){
		callbackName = functionName(callbackFunc);
		if (window[callbackName] == undefined){
			callbackName = 'jsonp_callback_' + Math.floor(Math.random() * 100000);
			window[callbackName] = callbackFunc;
		}
	}
	
	getJsonp(url, callbackName);
}

/** 
 * perform GET on url, 
 * pass callback function to handle response
 */
function getJsonp(url, callback){
	
	$.ajax({
	    url: url,
	    
	    // the name of the callback function
	    jsonpCallback: callback,
	 
	    //timeout in ms
	    timeout : 30000,
	    
	    // tell jQuery we're expecting JSONP
	    dataType: "jsonp",
	 
	    // work with the response
	    success: function( response ) {
	    	
	    },
	    error: function(jqXHR, textStatus, errorThrown){

    		if (textStatus == "parsererror"){
   	    		alert("Parsing error, please retry");
    		}
    		else if (textStatus == "error"){
    	    		alert("Error: " + errorThrown);
 	    	}
   	    	else if (textStatus == "timeout"){
   	    		alert("Request timedout, please retry");
   	    	}
   	    	else if (textStatus == "abort"){
   	    		alert("Error: Action aborted" );
   	    	}
   	    	else{
   	    		alert("Error performing action");
   	    	}
    		
	    }
	});
}


function functionName(fun) {
	  var ret = fun.toString();
	  ret = ret.substr('function '.length);
	  ret = ret.substr(0, ret.indexOf('('));
	  return ret;
}

function dummy(){}