Question

我试图在没有运气的情况下隐藏Twitter中所有受保护的帐户。代码正在处理其他具有不同类别的页面，例如Stack Overflow中的这些。

它与Ajax有关，但是如何在Ajax完成后触发它？

// ==UserScript==
// @name          Hide twitter locked accounts
// @namespace     http://www.multitopia.com
// @description   I want to rule the world
// @include       *
// @require      http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js
// ==/UserScript==


$(document).ready(function() {
$('.stream-item-content:has(.protected-icon)').hide();
});

Answer 1

首先，我会让循环更具可读性：

for (var n = images.length -1 ; n >=0; n--) {

之后设置

img.style.display = "none";

隐藏图片

另一种方法是使用css选择器禁用所有图像元素。您可以使用jQuery和greasemonkey

执行此操作

$('img').css({ 'display': 'none'});

编辑：这将创建一个样式元素，该元素将匹配所有img标记，即使它之后使用ajax加载。

var styleTag = document.createElement('style');
styleTag.type = "text/css";
styleTag.appendChild(document.createTextNode("img {display:none;}");
document.body.appendChild(styleTag);

Answer 2

Twitter使用AJAX引入所有内容 - 文本和图像......所以你需要在AJAX加载运行后运行代码 - 这个答案How to load a greasemonkey script after AJAX-Request提供了这样做的功能....

根据@rlemon关于另一个例子的评论：

How can I intercept XMLHttpRequests from a Greasemonkey script?

Answer 3

最强大的方法是使用有效的间隔计时器轮询页面。在实践中，这比拦截和解密AJAX调用要容易得多。

这是一个使用我的实用程序函数“waitForKeyElements”执行此操作的脚本：

// ==UserScript==
// @name    Twitter: Hide protected accounts
// @include http://twitter.com/*
// @require http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js
// ==/UserScript==

function HideProtectedAccounts (jNode) {

    jNode.hide();
}

waitForKeyElements ( 
    ".stream-item-content:has(.protected-icon)", 
    HideProtectedAccounts
);

/*--- waitForKeyElements():  A handy, utility function that
    does what it says.
*/
function waitForKeyElements (
    selectorTxt,    /* Required: The jQuery selector string that
                        specifies the desired element(s).
                    */
    actionFunction, /* Required: The code to run when elements are
                        found. It is passed a jNode to the matched
                        element.
                    */
    bWaitOnce,      /* Optional: If false, will continue to scan for
                        new elements even after the first match is
                        found.
                    */
    iframeSelector  /* Optional: If set, identifies the iframe to
                        search.
                    */
)
{
    var targetNodes, btargetsFound;

    if (typeof iframeSelector == "undefined")
        targetNodes     = $(selectorTxt);
    else
        targetNodes     = $(iframeSelector).contents ()
                                           .find (selectorTxt);

    if (targetNodes  &&  targetNodes.length > 0) {
        /*--- Found target node(s).  Go through each and act if they
            are new.
        */
        targetNodes.each ( function () {
            var jThis        = $(this);
            var alreadyFound = jThis.data ('alreadyFound')  ||  false;

            if (!alreadyFound) {
                //--- Call the payload function.
                actionFunction (jThis);
                jThis.data ('alreadyFound', true);
            }
        } );
        btargetsFound   = 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
                                        );
                },
                200
            );
            controlObj [controlKey] = timeControl;
        }
    }
    waitForKeyElements.controlObj   = controlObj;
}

注意：

这是主Twitter网站，对吧？如果是包含iFramed twitter内容的页面，请调整传递给waitForKeyElements的参数以匹配。
键可调节是动作功能（在本例中为HideProtectedAccounts）和传递给waitForKeyElements的CSS选择器。

Greasemonkey脚本在Twitter上隐藏AJAXed内容

3 个答案: