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POChange existing JavaScript object functions with prototype?
 

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  1. POChange existing JavaScript object functions with prototype?
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    <p>I'm trying to hook PageDown into my Rails app, because the Markdown editor is awesome.</p> <p>However, I'm finding this difficult because Rails auto-assigns ids via form helpers, and PageDown expects the id "wmd-input" to be assigned to a textarea field. In my model I have a text property named "body" that I want to serve as the editor, but <code>f.text_area :body</code> yields a textarea with the id <code>post_body</code>.</p> <p>So, my current approach is to tell PageDown to associate the editor with a textarea with a particular class name rather than associating it with a particular ID. This is where I'm confused as to how to proceed. Here's a <a href="http://code.google.com/p/pagedown/source/browse/Markdown.Editor.js?r=46bb422ffaa27b3a2895ff3ce8c31f8b491fa9a9" rel="nofollow">link to Markdown.Editor.js</a>.</p> <p>Navigate to <code>function PanelCollection(postfix) {</code> (on line 244). I want to change the third line in that function from:</p> <pre><code>this.input = doc.getElementById("wmd-input" + postfix); </code></pre> <p>to</p> <pre><code>this.input = doc.getElementsByClassName("wmd-input" + postfix)[0]; </code></pre> <p>I've never done anything like this. Also, editing the source for Markdown.Editor.js isn't really an option since it is auto-generated. I need to alter the function after it's been created. How can I do this?</p> <p><strong>EDIT #1:</strong></p> <p>So, this was my first time forking and contributing back to anything on GitHub, but I forked the pagedown-rails gem and made my change and ensured it worked by connecting the gem listed in my Gemfile to my fork. Worked beautifully, thanks for the suggestion. I contributed back <a href="https://github.com/rh/pagedown-rails/pull/2" rel="nofollow">via this pull request</a>.</p>
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    1. USLester Peabody
    1. USLester Peabody
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    1. COI don't think the question has anything to do with ruby-on-rails or prototypes.
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      1. USBergi
    2. COWhy not host the source yourself, and edit that one line yourself? oh, and if it can only be edited at a certain point in time, simply expose the constructor...
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      1. USElias Van Ootegem
    3. COIf my reason for making the change is rails-specific, does that not merit an inclusion of the rails tag?
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      1. USLester Peabody
 

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