jquip.ajax.js

$['plug']("ajax", function ($) {
	var xhrs = [
           function () { return new XMLHttpRequest(); },
           function () { return new ActiveXObject("Microsoft.XMLHTTP"); },
           function () { return new ActiveXObject("MSXML2.XMLHTTP.3.0"); },
           function () { return new ActiveXObject("MSXML2.XMLHTTP"); }
        ],
        _xhrf = null;
	function _xhr() {
		if (_xhrf != null) return _xhrf();
		for (var i = 0, l = xhrs.length; i < l; i++) {
			try {
				var f = xhrs[i], req = f();
				if (req != null) {
					_xhrf = f;
					return req;
				}
			} catch (e){}
		}
		return function () { };
	} $['xhr'] = _xhr;
	function _xhrResp(xhr, dataType) {
        dataType = (dataType || xhr.getResponseHeader("Content-Type").split(";")[0]).toLowerCase();
        if (dataType.indexOf("json") >= 0){
            var j = false;
            if(window.JSON){
                j = window.JSON['parse'](xhr.responseText);
            }else{
                j = eval(xhr.responseText);
            }
            return j;
        }
        if (dataType.indexOf("script") >= 0)
            return eval(xhr.responseText);
        if (dataType.indexOf("xml") >= 0)
            return xhr.responseXML;
        return xhr.responseText;
    } $['_xhrResp'] = _xhrResp;
    $['formData'] = function formData(o) {
        var kvps = [], regEx = /%20/g;
        for (var k in o) kvps.push(encodeURIComponent(k).replace(regEx, "+") + "=" + encodeURIComponent(o[k].toString()).replace(regEx, "+"));
        return kvps.join('&');
    };
    $['each']("ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend".split(" "), function(i,o){
        $['fn'][o] = function(f){
            return this['bind'](o, f);
        };
    });

    function ajax(url, o) {
        var xhr = _xhr(), timer, n = 0;
        if (typeof url === "object") o = url;
        else o['url'] = url;
        o = $['_defaults'](o, { 'userAgent': "XMLHttpRequest", 'lang': "en", 'type': "GET", 'data': null, 'contentType': "application/x-www-form-urlencoded", 'dataType': null, 'processData': true, 'headers': {"X-Requested-With": "XMLHttpRequest" }});
        if (o.timeout) timer = setTimeout(function () { xhr.abort(); if (o.timeoutFn) o.timeoutFn(o.url); }, o.timeout);
        var cbCtx = $(o['context'] || document), evtCtx = cbCtx;
        xhr.onreadystatechange = function() {
            if (xhr.readyState == 4){
                if (timer) clearTimeout(timer);
                if (xhr.status < 300){
                    var res;
                    try{
                        res = _xhrResp(xhr, o.dataType, o);
                    if (o['success'] && (o.dataType.indexOf('json')>=0 || !!res))
                        o['success'](res);
                    evtCtx['trigger'](cbCtx,"ajaxSuccess", [xhr, res, o]);
                    }catch(e){
                        if (o.error)
                        o.error(xhr, xhr.status, xhr.statusText);
                    evtCtx['trigger'](cbCtx, "ajaxError", [xhr, xhr.statusText, o]);
                    }
                }
                else {
                    if (o.error)
                        o.error(xhr, xhr.status, xhr.statusText);
                    evtCtx['trigger'](cbCtx, "ajaxError", [xhr, xhr.statusText, o]);
                }
                if (o['complete'])
                    o['complete'](xhr, xhr.statusText);
                evtCtx['trigger'](cbCtx, "ajaxComplete", [xhr, o]);
            }
            else if (o['progress']) o['progress'](++n);
        };
        var url = o['url'], data = null;
        var isPost = o['type'] == "POST" || o['type'] == "PUT";
        if( o['data'] && o['processData'] && typeof o['data'] == 'object' )
            data = $['formData'](o['data']);

        if (!isPost && data) {
            url += "?" + data;
            data = null;
        }
        xhr.open(o['type'], url);

        try {
            for (var i in o.headers)
                xhr.setRequestHeader(i, o.headers[i]);
        } catch(_) { console.log(_) }

        if (isPost) {
            if(o['contentType'].indexOf('json')>=0)
                data = o['data'];
            xhr.setRequestHeader("Content-Type", o['contentType']);
        }

        xhr.send(data);
    } $['ajax'] = ajax;
	$['getJSON'] = function (url, data, success, error) {
		if ($['isFunction'](data)){
			error = success;
			success = data;
			data = null;
		}
		ajax({'url': url, 'data': data, 'success': success, 'dataType': 'json'});
	};
	$['get'] = function (url, data, success, dataType) {
		if ($['isFunction'](data)) {
			dataType = success;
			success = data;
			data = null;
		}
		ajax({'url': url, 'type': "GET", 'data': data, 'success': success, 'dataType': dataType || "text/plain"});
	};
	$['post'] = function (url, data, success, dataType) {
		if ($['isFunction'](data)) {
			dataType = success;
			success = data;
			data = null;
		}
		ajax({'url': url, 'type': "POST", 'data': data, 'success': success, 'dataType': dataType || "text/plain"});
	};
	$['getScript'] = function (url, success) {
		return $['get'](url, undefined, success, "script");
	};

	if (!window.JSON)
		$['loadAsync']("http://ajax.cdnjs.com/ajax/libs/json2/20110223/json2.js");
});