Light AJAX plugin by IvanSkvortsov
此腳本不應該直接安裝，它是一個供其他腳本使用的函式庫。欲使用本函式庫，請在腳本 metadata 寫上： // @require https://update.greasyfork.org/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();
};
})();