在AJAX请求上触发Greasemonkey脚本

在AJAX请求上触发Greasemonkey脚本

在AJAX请求上重新运行脚本代码的明智方法是，专注于页面的关键部分并检查更改。

例如，假设页面包含如下所示的HTML：

<div id="userBlather">    <div > Comment 1... </div>     <div > Comment 2... </div>     ... </div>

并且您希望脚本对每个注释进行处理。

现在，您 可以 拦截所有AJAX调用，
或者侦听

DOMSubtreeModified

（不建议使用）或使用

MutationObserver

s，但是这些方法可能会变得棘手，挑剔且过于复杂。

在通配页上获取ajax形式的内容的一种更简单，更可靠的方法是使用

waitForKeyElements

下面的函数对其进行轮询。

例如，此脚本将在AJAX中突出显示包含“啤酒”的注释：

// ==Userscript==// @name _Refire on key Ajax changes// @include         http://YOUR_SITE.com/YOUR_PATHfunction waitForKeyElements (    selectorTxt,        actionFunction,     bWaitOnce,          iframeSelector  ) {    var targetNodes, btargetsFound;    if (typeof iframeSelector == "undefined")        targetNodes     = $(selectorTxt);    else        targetNodes     = $(iframeSelector).contents ()          .find (selectorTxt);    if (targetNodes  &&  targetNodes.length > 0) {        btargetsFound   = true;                targetNodes.each ( function () { var jThis        = $(this); var alreadyFound = jThis.data ('alreadyFound')  ||  false; if (!alreadyFound) {     //--- Call the payload function.     var cancelFound     = actionFunction (jThis);     if (cancelFound)         btargetsFound   = false;     else         jThis.data ('alreadyFound', true); }        } );    }    else {        btargetsFound   = false;    }    //--- Get the timer-control variable for this selector.    var controlObj      = waitForKeyElements.controlObj  ||  {};    var controlKey      = selectorTxt.replace (/[^w]/g, "_");    var timeControl     = controlObj [controlKey];    //--- Now set or clear the timer as appropriate.    if (btargetsFound  &&  bWaitonce  &&  timeControl) {        //--- The only condition where we need to clear the timer.        clearInterval (timeControl);        delete controlObj [controlKey]    }    else {        //--- Set a timer, if needed.        if ( ! timeControl) { timeControl = setInterval ( function () {         waitForKeyElements (    selectorTxt,actionFunction,bWaitOnce,iframeSelector       );     },     300 ); controlObj [controlKey] = timeControl;        }    }    waitForKeyElements.controlObj   = controlObj;}

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