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Super Light AJAX plugin

Super Light AJAX plugin by IvanSkvortsov

Verzia zo dňa 04.08.2017. Pozri najnovšiu verziu.

Tento skript by nemal byť nainštalovaný priamo. Je to knižnica pre ďalšie skripty, ktorú by mali používať cez meta príkaz // @require https://update.greatest.deepsurf.us/scripts/32009/209806/Super%20Light%20AJAX%20plugin.js 

// ==UserScript==
// @name           Super Light AJAX plugin
// @description    Super Light AJAX plugin by IvanSkvortsov
// @description:ru Супер упрощенная версия AJAX плагина от IvanSkvortsov
// @include        *://*
// @author         IvanSkvortsov
// @date           2017.08.04
// @version        1.0.2
// @grant          none
// ==/UserScript==
(function(){
	var lqueue = [], lrequestInProgress = false, lqueueCleaned = true;
	function XHttpRequestLight(){
		var request = lqueue[0], xhttp = null, i, key,
			activeXs = ['Msxml3.XMLHTTP', 'Msxml2.XMLHTTP.6.0', 'Msxml2.XMLHTTP.3.0', 'Msxml2.XMLHTTP', 'Microsoft.XMLHTTP',];
		if(!( request && (lrequestInProgress === false || request.async === true) && lqueue.length > 0 ))
			return;
		// handle request:
		request.method = request.method || 'GET';
		if( request.method.toUpperCase() === 'GET' && request.data ){
			request.url += '?' + request.data;
			request.data = null;
		}
		request.async = typeof request.async === 'boolean' ? request.async : true;
		// createXmlHttpRequest:
		if( window.XMLHttpRequest )
			xhttp = new XMLHttpRequest();
		else if( window.ActiveXObject ){
			for( i = 0; i < activeXs.length; ++i ){
				try{xhttp = new ActiveXObject(activeXs[i]);}
				catch(error){continue;}
				break;
			}
			if( !xhttp ){
				console.error("[XHttpRequestLight] can't create ActiveXObject");
				return;
			}
		}else{
			console.error("[XHttpRequestLight] can't create XmlHttpRequest object");
			return;
		}
		xhttp.open( request.method, request.url, request.async );
		lrequestInProgress = true;
		lqueue.shift();
		for( key in request.headers )
			xhttp.setRequestHeader( key, request.headers[key] );
		xhttp.url = request.url;
		var events = ['onabort', 'onerror', 'onload', 'onloadend', 'onloadstart', 'onprogress', 'onreadystatechange', 'ontimeout',];
		// handle XmlHttpRequest events
		events.forEach(function(type){
			if( request[type] ){
				xhttp[type] = function(event){
					xhttp.lengthComputable = event.lengthComputable || false;
					xhttp.loaded = event.loaded || 0;
					xhttp.total = event.total || 0;
					request[type].call(xhttp, xhttp.responseText);
					if( type === 'onerror' || type === 'onload' || (type === 'onreadystatechange' && xhttp.readyState == 4 && xhttp.status == 200 && !request.onload)){
						lrequestInProgress = false;
						request.delay = request.delay > 20 ? request.delay : 20;
						setTimeout( XHttpRequestLight, request.delay );
					}
				};
			}
		});
	}
	window.ISL = window.ISL || {};
	// AJAX API
	ISL.lajaxAddXHR = function(){
		var request;
		switch(arguments.length){
			case 0:
				return;
			case 1:
				request = arguments[0];
				if( request.length )
					request.forEach( function(req){ lqueue.push(req);} );
				else
					lqueue.push(request);
				break;
			default:
				console.error("[lajaxAddXHR] invalid number of arguments: " + arguments.length);
				return;
		}
		lqueueCleaned = false;
	};
	ISL.lajax = function(){
		this.lajaxAddXHR(arguments);
		XHttpRequestLight();
	};
	ISL.lajaxClean = function(){
		lqueue.length = 0;
		lrequestInProgress = false;
		lqueueCleaned = true;
	};
	ISL.lajaxLength = function(){ return lqueue.length; };
})();