getElementsByTagName does not return comment nodes in javascript
I want to retrieve all the nodes present in particular DIV element.see the below test page (firefox)
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style="display:block"
data-ad-client="ca-pub-5408099190056760"
data-ad-slot="7305827575"
data-ad-format="auto"
data-full-width-responsive="true"></ins>
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<span>(楼主)</span>
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<span>2021-01-24 19:51</span>
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<p>The heart of the problem is that these methods...</p>
<pre><code>document.getElementById(...)
document.getElementsByTagName(...)
</code></pre>
<p>... return <em>elements</em>, as indicated by their names. However, comments and text nodes are not elements. They are nodes, but not elements.</p>
<p>So you need to do some traditional old fashioned DOM scripting, using <code>childNodes</code> like Vincent Robert suggested. Since - as you indicate in your comment to him - that <code>.childNodes</code> only goes one 'layer' deep, you need to define a recursive function to find the comment nodes: (I'm naming mine <code>document.getCommentNodes()</code>)</p>
<pre><code>document.getCommentNodes = function() {
function traverseDom(curr_element) { // this is the recursive function
var comments = new Array();
// base case: node is a comment node
if (curr_element.nodeName == "#comment" || curr_element.nodeType == 8) {
// You need this OR because some browsers won't support either nodType or nodeName... I think...
comments[comments.length] = curr_element;
}
// recursive case: node is not a comment node
else if(curr_element.childNodes.length>0) {
for (var i = 0; i<curr_element.childNodes.length; i++) {
// adventures with recursion!
comments = comments.concat(traverseDom(curr_element.childNodes[i]));
}
}
return comments;
}
return traverseDom(document.getElementsByTagName("html")[0]);
}
</code></pre>
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initialContent:'',
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