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Editorial Team
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Asked: 2026-06-13T21:59:56+00:00

I am trying to get all <TR> tags within <TABLE> tag in an array

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I am trying to get all <TR> tags within <TABLE> tag in an array and I am trying to refer it like arrayname[1], arrayname[2] . Then I am looking forward to set a unique title attribute to <TR> tag’s, using idArr[1].setAttribute("title", "myClass");

Here is the code I have written, which does not works. Can anyone guide me what’s wrong in it !!

<html>
<head>
<script type="text/javascript" >
var idArr = [];
var formm=document.getElementById("form1");
var trs = formm.getElementsByTagName("tr");
alert(trs.length);
for(var i=0;i<trs.length;i++)
{
   idArr.push(trs[i].id);
   alert(idArr.innerText);
}
idArr[1].setAttribute("title", "myClass");
</script>

</head>
<body>
<form id="form1">
<table border="1">
<tr>
<td>One</td>
<td>Two</td>
</tr>
<tr>
<td>ABC</td>
<td>EFG</td>
</tr>

</table>
</form>
</body>
</html>
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1 Answer

  1. Editorial Team

    A couple considerations:

    • The elements do not exist when the code runs,
    • You don’t need the Array for what you’re doing.
    <html>
<head>
    <title>My Page</title>
</head>
<body>
    <form id="form1">
        <table border="1">
        <tr>
            <td>One</td>
            <td>Two</td>
        </tr>
        <tr>
            <td>ABC</td>
            <td>EFG</td>
        </tr>

        </table>
    </form>

 <!-- Now your script will not run until the elements above are loaded-->
    <script type="text/javascript" >
    var formm=document.getElementById("form1");
    var trs = formm.getElementsByTagName("tr");
    for(var i = 0, len = trs.length; i < len; i++) {
        trs[i].setAttribute("title", "myClass");
    }
    </script>

</body>
</html>

    So I got rid of the extra Array code, and I moved the script to the bottom of the page so that it doesn’t run until the DOM above it has loaded.

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