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Light AJAX plugin

Light AJAX plugin by IvanSkvortsov

Script này sẽ không được không được cài đặt trực tiếp. Nó là một thư viện cho các script khác để bao gồm các chỉ thị meta // @require https://update.greatest.deepsurf.us/scripts/32001/209692/Light%20AJAX%20plugin.js 

// ==UserScript==
// @name           Light AJAX plugin
// @description    Light AJAX plugin by IvanSkvortsov
// @description:ru Упрощенная версия AJAX плагина от IvanSkvortsov
// @include        *://*
// @author         IvanSkvortsov
// @date           2017.08.04
// @version        1.0.0
// @grant          none
// ==/UserScript==

(function(){
	var queue = [], requestInProgress = false, queueCleaned = true;
	function createXHttp()
	{
		if( window.XMLHttpRequest )
			return new XMLHttpRequest();
		else if( window.ActiveXObject ){
			var types = [
				'Msxml3.XMLHTTP',
				'Msxml2.XMLHTTP.6.0',
				'Msxml2.XMLHTTP.3.0',
				'Msxml2.XMLHTTP',
				'Microsoft.XMLHTTP',
			];
			for( let i = 0; i < types.length; ++i )
			{
				try{
					return new ActiveXObject(types[i]);
				}catch(error){}
			}
			console.error("[createXHttp] can't create ActiveXObject");
		}else{
			console.error("[createXHttp] can't create xhttp object");
		}
		return null;
	}
	function getXHttpRequest(){
		if( !(queue.length > 0) )
			return null;
		var request = queue[0];
		request.method = request.method || 'GET';
		if( request.method.toUpperCase() === 'GET' && request.data && request.data !== '' )
		{
			request.url += '?' + request.data;
			request.data = '';
		}
		request.async = (typeof request.async !== 'boolean' ? true : request.async );
		return request;
	}
	function handleXHttpEvent( type, xhttp, request, event ){
		var response;
		if( request[type] )
		{
			response = xhttp;
			response.lengthComputable = xhttp.lengthComputable || event.lengthComputable || false;
			response.loaded = xhttp.loaded || event.loaded || 0;
			response.total = xhttp.total || event.total || 0;
			response.url = xhttp.responseURL || request.url;
			
			request[type].call( response, response.responseText );
			if( type === 'onerror' || type === 'onload' ||
				(type === 'onreadystatechange' && response.readyState == 4 && response.status == 200 && !request.onload ) )
			{
				requestInProgress = false;
				request.delay = request.delay > 20 ? request.delay : 20;
				setTimeout( XHttpRequest, request.delay );
			}
		}
	}
	function initXHttpEvents( xhttp, request ){
		var types = ['onabort', 'onerror', 'onload', 'onloadend', 'onloadstart', 'onprogress',
			'onreadystatechange', 'ontimeout',];
		function addXHttpEventListener(type){
			if( request[type] )
				xhttp[type] = function XHttpEvents(event){handleXHttpEvent(type, xhttp, request, event);};
		}
		types.forEach( addXHttpEventListener );
	}
	function initXHttp( xhttp, request ){
		initXHttpEvents( xhttp, request );
		for( let key in request.headers )
			xhttp.setRequestHeader( key, request.headers[key] );
	}
	function XHttpRequest(){
		var request, xhttp;
		request = getXHttpRequest();
		if( request && (requestInProgress === false || request.async === true) && queue.length > 0 )
		{
			queue.shift();
			requestInProgress = true;
			xhttp = createXHttp();
			initXHttp( xhttp, request );
			xhttp.open( request.method, request.url, request.async );
			xhttp.send( request.data || null );
		}
	}
	function constructXHttpRequest( url, settings ){
		var request = createNewObject(settings);
		request.url = url;
		return request;
	}
	function createNewObject( obj ){
		if( !obj )
			return {};
		var new_obj = {}, key, val;
		for( key in obj )
		{
			val = obj[key];
			if( Object.prototype.hasOwnProperty.call(obj, key) && val )
				new_obj[key] = val;
		}
		return new_obj;
	}
	window.ISL = window.ISL || {};
	// AJAX API
	ISL.ajaxClean = function(){
		queue.length = 0;
		requestInProgress = false;
		queueCleaned = true;
	};
	ISL.ajaxLength = function(){ return queue.length; };
	ISL.ajaxAddXHR = function(){
		var request, url, settings;
		switch( arguments.length )
		{
			case 0:
				return;
			case 1:
				request = arguments[0];
				if( request.length )
					request.forEach( function(req){ queue.push(req);} );
				else
					queue.push(request);
				break;
			case 2:
				url = arguments[0];
				settings = arguments[1];
				if( url.length )
					url.forEach( function(u){queue.push(constructXHttpRequest(u, settings));});
				else
					queue.push( constructXHttpRequest(url, settings) );
				break;
			default:
				console.error("[ajaxAddXHR] invalid number of arguments");
				return;
		}
		queueCleaned = false;
	};
	ISL.ajax = function(){
		this.ajaxAddXHR(arguments);
		XHttpRequest();
	};
})();