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    <p>According to <a href="http://api.jquery.com/insertBefore/" rel="nofollow">http://api.jquery.com/insertBefore/</a></p> <p>you want this:</p> <pre><code>$('#example thead tr').each( function () { $(nCloneTh).insertBefore(this.childNodes[0]); }); </code></pre> <p>although maybe the more "jQuery" way to do this would be:</p> <pre><code>$('#example thead tr').prepend(nCloneTh); //untested but should work </code></pre> <p><strong>EDIT</strong>:</p> <p>OK, the only real difference I see in his example vs. yours is that he's appending the "row-expander" td's before initializing dataTables.</p> <p>I'm not sure what your JSON input looks like, but this is how I do mine (I'll try to make it somewhat generic):</p> <pre><code>aoColumns: [{ mDataProp: 'Id', sClass: 'center', bUseRendered: false, fnRender: function (o) { return '&lt;img src="media/open.png" class="row-expander" alt="" /&gt;'; } }, { mDataProp: 'NoteCount', sClass: 'center', bUseRendered: false, fnRender: function (o) { return String.format('&lt;img src="media/blue/{0}.png" alt="" class="notes-count" /&gt;', o.aData.NoteCount); } }, { mDataProp: 'Name', bUseRendered: false, fnRender: function (o) { return String.format('&lt;a href="./MyObjHome.aspx?ID={1}"&gt;{0}&lt;/a&gt;', o.aData.Name, o.aData.Id); } }, // add more columns ] </code></pre> <p>This way you don't need to mess around with adding the extra cells every time the table re-renders... the internals of dataTables will handle your 'fake' column which only exists to hold an image for the expansion state.</p> <p>This gets a bit trickier if you are using a 2D array rather than an array of objects. My data source for the above example looks something like:</p> <pre><code>[{ Id: some-guid, Name: 'My Object Name', NoteCount: 4 }, { Id: some-guid-2, Name: 'My Second Name', NoteCount: 10 }] </code></pre>
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    1. POHow to insert TD in datatables
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    1. COAccording to their example, a clone isn't required for each: http://datatables.net/release-datatables/examples/api/row_details.html
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    2. CO@GDP: You're right, I missed the 'cloneNode' call on there, sorry about that.
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