using the DOM to change the CLASS attribute

[silly putty]

hello. i have a <tablewith each cell having its own unique ID (see
below). What i want to do is change the CLASS attribute for the SPAN
in one of the cells. i'm currently testing this in IE 6. In my
javascript, i wrote

document.getEle mentById('0_1') .getElementsByT agName("span")[0].setAttribute(" className",
"hasEvents" );

However, i get the following error message:

'document.getEl ementById(...). getElementsByTa gName(...).0' is null or
not an object.

Can someone please help? thanks

HTML code:

<table>
<tr>
<td id="0_0"><span class="noEvents ">1</span></td>
<td id="0_1"><span class="noEvents ">2</span></td>
<td id="0_2"><span class="noEvents ">3</span></td>
</tr>
</table>

[nic.j.roche]

document.getEle mentById('YO'). getElementsByTa gName("span")[0].className
= "hasEvents" ;
silly putty wrote:

hello. i have a <tablewith each cell having its own unique ID (see
below). What i want to do is change the CLASS attribute for the SPAN
in one of the cells. i'm currently testing this in IE 6. In my
javascript, i wrote

document.getEle mentById('0_1') .getElementsByT agName("span")[0].setAttribute(" className",
"hasEvents" );

However, i get the following error message:

'document.getEl ementById(...). getElementsByTa gName(...).0' is null or
not an object.

Can someone please help? thanks

HTML code:

<table>
<tr>
<td id="0_0"><span class="noEvents ">1</span></td>
<td id="0_1"><span class="noEvents ">2</span></td>
<td id="0_2"><span class="noEvents ">3</span></td>
</tr>
</table>

[silly putty]

didn't work

ni*********@gma il.com wrote:

document.getEle mentById('YO'). getElementsByTa gName("span")[0].className
= "hasEvents" ;
silly putty wrote:

hello. i have a <tablewith each cell having its own unique ID (see
below). What i want to do is change the CLASS attribute for the SPAN
in one of the cells. i'm currently testing this in IE 6. In my
javascript, i wrote

document.getEle mentById('0_1') .getElementsByT agName("span")[0].setAttribute(" className",
"hasEvents" );

However, i get the following error message:

'document.getEl ementById(...). getElementsByTa gName(...).0' is null or
not an object.

Can someone please help? thanks

HTML code:

<table>
<tr>
<td id="0_0"><span class="noEvents ">1</span></td>
<td id="0_1"><span class="noEvents ">2</span></td>
<td id="0_2"><span class="noEvents ">3</span></td>
</tr>
</table>

[nic.j.roche]

did you change the id of the TD to "YO"

silly putty wrote:

didn't work

ni*********@gma il.com wrote:

document.getEle mentById('YO'). getElementsByTa gName("span")[0].className
= "hasEvents" ;
silly putty wrote:

hello. i have a <tablewith each cell having its own unique ID (see
below). What i want to do is change the CLASS attribute for the SPAN
in one of the cells. i'm currently testing this in IE 6. In my
javascript, i wrote
>
document.getEle mentById('0_1') .getElementsByT agName("span")[0].setAttribute(" className",
"hasEvents" );
>
However, i get the following error message:
>
'document.getEl ementById(...). getElementsByTa gName(...).0' is null or
not an object.
>
Can someone please help? thanks
>
HTML code:
>
<table>
<tr>
<td id="0_0"><span class="noEvents ">1</span></td>
<td id="0_1"><span class="noEvents ">2</span></td>
<td id="0_2"><span class="noEvents ">3</span></td>
</tr>
</table>

[Matt Kruse]

silly putty wrote:

didn't work

Could you be any more vague?

>>document.getE lementById('0_1 ').getElementsB yTagName("span" )[0].setAttribute(" className",
"hasEvents" );

An ID attribute value cannot start with a digit. Your ID is invalid, so
results of the getElementById( ) call are unpredictable.

One way of debugging your own problem is to do an alert at each stage to see
where your problem is happening:

alert(document. getElementById( '0_1'));
alert(document. getElementById( '0_1').getEleme ntsByTagName("s pan"));
alert(document. getElementById( '0_1').getEleme ntsByTagName("s pan")[0]);

--
Matt Kruse
http://www.JavascriptToolbox.com
http://www.AjaxToolbox.com

[silly putty]

Matt was right in that the ID can't begin with a digit. Thanks Matt
for figuring out the problem.

Just curious, ni*********@gma il.com suggested that I change the ID to
Y0. what does Y0 mean? Thanks
Matt Kruse wrote:

silly putty wrote:

didn't work

Could you be any more vague?

>document.getEl ementById('0_1' ).getElementsBy TagName("span")[0].setAttribute(" className",
"hasEvents") ;

An ID attribute value cannot start with a digit. Your ID is invalid, so
results of the getElementById( ) call are unpredictable.

One way of debugging your own problem is to do an alert at each stage to see
where your problem is happening:

alert(document. getElementById( '0_1'));
alert(document. getElementById( '0_1').getEleme ntsByTagName("s pan"));
alert(document. getElementById( '0_1').getEleme ntsByTagName("s pan")[0]);

--
Matt Kruse
http://www.JavascriptToolbox.com
http://www.AjaxToolbox.com

[RobG]

silly putty wrote:

Matt was right in that the ID can't begin with a digit. Thanks Matt
for figuring out the problem.

Please don't top-post here, reply below a trimmed quote of whatever you
are replying to.

>
Just curious, ni*********@gma il.com suggested that I change the ID to
Y0. what does Y0 mean?

Nothing, it just means your ID doesn't start with a digit.

Incidentally, since you are looking for spans within the table, have
you consdered using an ID on the table and just getting all the spans
once? If you base the function on just getting an element reference,
you can re-use the code for any kind of element.

e.g.

<table id="theTable">
<tr>
<td><span class="noEvents ">...</span>.
<td><span class="hasEvent s">...</span>
<td><span class="noEvents ">...</span>
</tr>
</table>

<script type="text/javascript">
function doSpanStuff(el) {
var allSpans = el.getElementsB yTagName('span' );
var i = allSpans.length ;
var aSpan;
while (i--){
aSpan = allSpans[i];
if ('hasEvents' == aSpan.className ){
/* do stuff */
}
}
}

doSpanStuff(doc ument.getElemen tById('theTable '));

</script>
--
Rob