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    <p><strong>About firing twice:</strong></p> <p>If the page contains <code>&lt;iframe&gt;</code>s, userscript will fire in each of them.</p> <p>You need to determine if you are inside <code>&lt;iframe&gt;</code> or not. The simplest way to fire only in main page, and not iframes, is to wrap all code with:</p> <pre class="lang-js prettyprint-override"><code>if(top==self) { ... } </code></pre> <p>To see if there are <code>&lt;iframe&gt;s</code> in the page (either hardcoded in HTML or dynamically generated) I always use AdBlock Plus ("Open blockable items" dialog).</p> <p>I'm not sure however why the second "inside" alert does not launch. I've created a simple HTML page containing <code>&lt;iframe&gt;</code> and I get two alerts fired.</p> <p><strong>About the script generally:</strong></p> <p>You're doing double work here. You don't have to wrap everything to execute the script. What Greasemonkey does is executing the code lines after page loads (on <code>DOMContentLoaded</code>). So you don't have to create <code>&lt;script&gt;</code> tag, set it's body and append to document. You can just write</p> <p><code>document.getElementById("postingHtmlToolbar").firstChild.innerHTML += ...</code></p> <p>and it should do what you want (you don't need <code>contentEval</code> function at all).</p> <p>I don't have any blog on blogger so I can't log and see any URL and the problematic behavior, but playing step by step with the code should be enough to debug.</p> <p><strong>Edit 2:</strong></p> <p>Seems that you should change <code>firstChild</code> to <code>firstElementChild</code>. </p> <ul> <li><a href="https://developer.mozilla.org/en/DOM/element.firstChild" rel="nofollow"><code>firstChild</code></a> returns <code>Node</code></li> <li><a href="https://developer.mozilla.org/En/DOM/Element.firstElementChild" rel="nofollow"><code>firstElementChild</code></a> returns <code>Element</code>.</li> </ul> <p>There is <code>innerHTML</code> property in <code>Element</code> (since Firefox 3.5), but not in <code>Node</code>. Yeah, it's really inconsistent and annoying at times. I've come into similar problem recently.</p> <p><strong>Edit 3:</strong></p> <p>There's a couple of things there. Please don't tell me it doesn't work still :)</p> <pre class="lang-js prettyprint-override"><code>var func = function() { var obj = document.getElementById("postingHtmlToolbar"); if(obj !== null){ // only if object exists, so we don't have errors //alert(obj); obj.style.display = 'block'; // it's hidden by default obj.firstElementChild.innerHTML += "FOO"; } } window.setTimeout(func, 3000); // execute with delay -- let's give Google's JS time to be loaded first </code></pre>
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    1. COInteresting to know, still if gives me no ideas about why my script is not doing what it is supposed to do. All in all I do not care if my script fires 100 times as long as it eventually works. Do you think it is possible that the problem is occurring only because of the multiple runnings?
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    2. COI didn't look much in detail at your script before, please see the edit, and say precisely what happens and what should have happened. The problem is with appending HTML, or the button click? Does `document.getElementById("postingHtmlToolbar").firstChild.innerHTML += "FOO" ` work? About firing multiple times, I think each execution is in separate page context, so they should not affect each other (but I'm not entirely sure).
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    3. CO@edit: I don't think that greasemonkey can do things like that, it cannot directly edit the page. Don't ask me why GM cannot just come with a easy way to run code you 100% trust but instead for security reasons I cannot understand they restrict what you can do.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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