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From: Zlatko Duric <zladuric@gmail.com>
Newsgroups: comp.lang.javascript
Subject: Re: Duplicating the last row of a Table
Date: Sat, 18 Jan 2014 01:52:53 +0100
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That's a good behavior, because with the first quoted statement you're 
not getting a tbody element. You're getting its rows, and an array has 
no method appendChild (by default).

On 01/17/2014 10:44 PM, Dr J R Stockton wrote:

 > var Rose = document.getElementById("TB").rows

[cut]

 > Rose.appendChild(newnode);

[cut]

 > Cel = Rose.item(Y).cells.item(X)


So, you can do something like this to get the tbody:

     var tb = document.getElementById('tb');

and then use that in further code and append a row to tb.

You get rows with something like document.getElementById('table-id').rows.

-- 
Zlatko