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POJavascript throwing TypeError, document.getElementById when passed PHP variable
 

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  1. POJavascript throwing TypeError, document.getElementById when passed PHP variable
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    <p>I'm trying to write a function that will dynamically display a form (inside a div, of which there will be several instances, thus the weird "id" name) when you click a button. Then, it should POST to a separate PHP file. Here's the code I have so far:</p> <pre><code>function add_comment_url($table, $id) { $html = '&lt;div id="comment' . $id . '" name="comment_box" style="display: none"&gt; &lt;form action="cgi-bin/add_comment.php" method="post"&gt; &lt;textarea id="comment" name="comment"&gt;&lt;/textarea&gt; &lt;input type="hidden" name="id" value="' . $id . '"&gt; &lt;input type="hidden" name="table" value="' . $table . '"&gt; &lt;input type="submit" name="submit" value="Submit Comment"&gt; &lt;/form&gt;&lt;/div&gt; &lt;input type="button" value="Add Comment" onclick="showComment();"&gt; &lt;script&gt; var id= ' . json_encode($id) . '; showComment(id); &lt;/script&gt;'; return($html); } </code></pre> <p>The "Add Comment" button shows up fine, but I can't get the to display, and the Firefox console shows a "TypeError: div is null" error when I click on the button.</p> <p>I'm guessing I screwed up the JS variable assignment, but I'm at a loss as to how to fix it. Any thoughts?</p> <p>EDIT - Final code</p> <p>I figured out what I did wrong... I was defining the <code>var</code> when I didn't need to! Here's the new function, which works:</p> <pre><code>function add_comment_url($table, $id) { $html = '&lt;div id="comment' . $id . '" name="comment_box" style="display: none"&gt; &lt;form action="cgi-bin/add_comment.php" method="post"&gt; &lt;textarea id="comment" name="comment"&gt;&lt;/textarea&gt; &lt;input type="hidden" name="id" value="' . $id . '"&gt; &lt;input type="hidden" name="table" value="' . $table . '"&gt; &lt;input type="submit" name="submit" value="Submit Comment"&gt; &lt;/form&gt;&lt;/div&gt; &lt;input type="button" value="Add Comment" onclick="showComment(' . $id . ');"&gt;'; return($html); </code></pre> <p>}</p>
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    1. COIf you had looked at the page source your browser receives, you would have noticed that `var id= "<?php echo json_encode($id); ?>";` does not produce the expected output.
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    2. COI did notice that, which is why I knew it was a variable issue. Thanks!
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