Userscript to hide a child node of a cross-domain iframe

I want to hide the comments with some words inside by a (Tampermonkey) user script. As an example, I tried to apply a script

// ==UserScript==
// @name       Hide CNN
// @match      http://www.cnn.com/*
// @require     http://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js
// @grant       GM_addStyle
// @run-at document-end
// ==/UserScript==

$('div.post-body:contains("Abbas")').hide()

to the page http://www.cnn.com/2014/07/08/world/meast/mideast-tensions/index.html?hpt=hp_t1 with the following code for posts

<div class="post-body">
 <header>
 ...
 </header>
 <div class="post-body-inner">
 <div class="post-message-container" data-role="message-container">
 <div class="publisher-anchor-color" data-role="message-content">
 <div class="post-message " data-role="message" dir="auto">
 <p>Abbas is nothing but puppet dog of Western savages and Nazis who want to enslave entire world.</p>
 </div>
 ...
</div>

But the script does not seem to do anything. What am I doing wrong? Is it possible at all to filter a dynamically-loaded part of a webpage with a user script?

UPD: The problem is that comments are loaded in the iframe from another domain. How do I hide a child node of such an iframe with Tampermonkey? Do I need to use GM_xmlhttpRequest somehow?

Brock Adams

Disqus-powered comments are typically loaded in an <iframe>. So rather than set your script to run on the main site, you set it to run on the iframe src URL. In this case, http://disqus.com/embed/comments/...

Also, these comments are AJAX driven. So you must use AJAX savvy techniques.

A script like this should work (selector might need tuning):

// ==UserScript==
// @name     Hide select CNN comments
// @match    http://disqus.com/embed/comments/*
// @require  http://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js
// @require  https://gist.github.com/raw/2625891/waitForKeyElements.js
// @grant    GM_addStyle
// ==/UserScript==
/*- The @grant directive is needed to work around a design change
    introduced in GM 1.0.   It restores the sandbox.
*/

//--- Only run on comments for CNN pages
if (/&f=cnn&/i.test (location.search) ) {
    waitForKeyElements ('li.post:contains("Abbas")', hideComment);
}

function hideComment (jNode) {
    jNode.hide ();
}

来源：https://stackoverflow.com/questions/24633393/userscript-to-hide-a-child-node-of-a-cross-domain-iframe

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tampermonkey