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How to i change the class name inside <td>

<table id="results">
<thead>
<tr>
<td>1st</td>
<td class="horse1"></td>
</tr>
<tr>
<td>1st</td>
<td class="horse2"></td>
</tr>
<tr>
<td>1st</td>
<td class="horse3"></td>
</tr>
</thead>
</table>
i used this way it didnt worked .
document.getElementById("result").className=horseId;
horseId is an variable and contains value
and there are multiple classes insede so how do i select a specific class to change.

You missed two things; first, you attempted to target by ID result, when you need results. Second, you need to wrap the desired class names in quotes. You can use a variable for the assignment, assuming the variable maps to a string.
It's also worth mentioning that your existing class horse1 is several nodes down from your target ID results. I assume this is the element you're trying to change.
To change the class of the #results element, you can use document.getElementById('results').className = horseId;.
To change the class of the .horse1 element, you can use document.getElementsByClassName('horse1').className = horseId;.
Here's an example of the latter:
var horseId = 'rainbow_dash';
document.getElementsByClassName('horse1').className = horseId;
console.log(document.getElementsByClassName('horse1').className);
<table id="results">
<thead>
<tr>
<td>1st</td>
<td class="horse1"></td>
</tr>
</thead>
</table>
Hope this helps! :)

It should be "results"
document.getElementById("results").className=horseId;

DataTables: TypeError: i is undefined

I have a table like the following
the table as rowspans because for some users I need to have 2 lines (Like you see at column 'D')
I am trying to use datatables:
<table class="table table-bordered table-hover table-striped" id="myTable">
(...)
</table>
And I call this at the begining of the code:
<script>
$( document ).ready(function() {
$('#myTable').DataTable();
});
</script>
But I have this error:
TypeError: i is undefined
And the table is not like a datatable type!
Maybe it doesn't work with rowspans?
Any idea??

FWIW you can also get this error if you don't have the same number of <td></td> elements in every row. Make sure you aren't adding any rows with nav buttons or links or anything like that that may not be formatted the same way as the other rows.

jQuery DataTables plug-in doesn't support ROWSPAN attribute by default. However there is a RowsGroup plugin for jQuery DataTables that groups cells together to make them look like as if ROWSPAN attribute is used.
See this example for code and demonstration.
See jQuery DataTables – ROWSPAN in table body TBODY for more details.

For future referer.
It is because you are using Rowspan or colspan which is not supportable.
If you want to use colspan you can use it outside </tbody>.
Thanks.

This problem happens if your table is not well formed, for example you should have
<table>
<thead>
<th>
<tbody>
<tr>
<td>
And then the id of the table should not overlap with id of any thing else on the same page. Other wise you will get errors like i is udefined or c is undefined.

I'd say your table is not a data table because you have undefined data and the 'i' referred to is the internal iterator of the DataTable loop, the use of rowspans is the problem - I would redesign your table to have an entire row for each piece of data (in your example 250 would require an entire row with duplicate values for all other columns except D) - it is wholly possible to use css to hide values that are duplicated for the same visual effect, this would allow datatable filtering to still work on those rows (although you may need some hooks to reveal hidden data when these 'extra' rows are filtered).

I was facing the same issue. The main reason for the error is due to using the colspan & rowspan. Because the jQuery DataTables plug-in does not support them and hence causing the error.
TypeError: i is undefined
So, If you are using any colspan or rowspan within any <tr></tr> inside the <tbody></tbody> then make sure that each <tr></tr> having the same no of <td></td> for each row. If not, then repeat the <td style='display:none'></td> to match the same no e.g
<table border='1' cellspacing='2'>
<thead>
<tr>
<td>A</td>
<td>B</td>
<td>C</td>
</tr>
</thead>
<tbody>
<tr>
<td rowspan="2">1</td>
<td rowspan="2">name</td>
<td>200</td>
<td style='display:none'></td>
<td style='display:none'></td>
</tr>
<tr>
<td >300</td>
<td style='display:none'></td>
<td style='display:none'></td>
</tr>
</tbody>
</table>
I think by following the above suggestion will help you sure.

Remove <tr> tags between two <tr> tags with a id pattern of a specified format

I want to remove all the <tr> tags between two <tr> tags with their id starting with this format id="IT_BGJ_I_...."
For example
<tr id="IT_BGJ_I_6262626_IW_7373737_IWL_4></tr>
<tr id="AB_C"></tr>
<tr id="AB_D"></tr>
<tr id="AB_R"></tr>
<tr id="IT_BGJ_I_434343_IW_4343434_IWL_4></tr>
<tr id="IT_BGJ_I_45456_IW_7373737_IWL_4></tr>
<tr id="AB_F"></tr>
<tr id="AB_G"></tr>
<tr id="AB_RE"></tr>
<tr id="IT_BGJ_I_443433_IW_4343434_IWL_4></tr>
I need to remove
<tr id="AB_C"></tr>
<tr id="AB_D"></tr>
<tr id="AB_R"></tr>
<tr id="AB_F"></tr>
<tr id="AB_G"></tr>
<tr id="AB_RE"></tr>
from them.
The top and bottom ids will be starting with the format "IT_BGJ_I_....."
using jQuery or javascript

You can do this using ^ jQuery selector which indicated ID or Class or any attribute that are start with.
$('tr:not([id^="IT_BGJ_I_"])').remove()
OR
As i can see you want to remove DOM which id is starting with AB_, so you can do this by
$('tr:[id^="AB_"])').remove()

attribute-equals-selector
^ attribute-starts-with-selector
Description: Selects elements that have the specified attribute with
a value beginning exactly with a given string.
code
$('tr:not([id^="IT_BGJ_I_"])').remove();
or
$('tr[id^="AB_"])').remove();

Or try :not :
$("tr:not([id^='IT_BGJ_I_'])").remove();
Fiddle: http://jsfiddle.net/SawmJ/11/

Remove table row that contains a table

I have html that displays a table similar to:
<table>
<tr>
<th>col1</th>
<th>col2</ht>
</tr>
<tr>
<td>0001</td>
<td>Test</td>
</tr>
<tr>
<td colspan="2" id="detailsTable">
<table>
<tr>
<th>one</th>
<th>two</th>
</tr>
<tr>
<td>xxxxxx</td>
<td>xxxxxxx</td>
</tr>
</table>
</td>
</tr>
There is a column of expand and contract buttons on the outer table so that the nested table is only shown when the user clicks to expand.
The expansion works and the table gets displayed. However when when I try and remove the row from the outer table that contains the child table it doesn't work.
I had code like:
var rowIndex = $(this).parent().parent().prevAll().length;
$("table[id$=gvParentAccounts] tr").eq(rowIndex + 1).remove();
If the row only contains text it works as I'd like and removes the row, however if like in this case the row contains a table it is unable to remove the row as required.
I'm using ASP.Net and jQuery for this.
Thanks
Alan.

How about:
$(this).parent().parent().remove();
I'm not sure if this is exactly what you have, but here's a JSFiddle demonstrating that it works:
http://jsfiddle.net/9TQG9/1/
EDIT: Actually this:
$(this).parents("tr").eq(0).remove();
would be much nicer and more reliable. See here:
http://jsfiddle.net/9TQG9/2/

Remove all but a specific row from a table

I want to remove all rows apart from the row with id 'row0' from a table:
<table class="mytable">
<tr id="row0" class="myrow">
<td>aaa</td>
</tr>
<tr class="myrow">
<td>bbb</td>
</tr>
<tr class="myrow">
<td>ccc</td>
</tr>
</table>
But the following JQuery code removes ALL rows:
$('.mytable').children().not('#row0').remove();
Could someone explain why this happens? I would think that the child with id 'row0' would be excluded, but obviously that's not the case.
I have found another way to do this but still curious why the above method doesn't work:
$('.mytable').find('tr:not(#row0)').remove();

Because the children of a table element are thead, tfoot or tbody elements. A tbody element is always created in the generated DOM, even if it is not explicitly written in the HTML code.
You can also do:
$('.mytable tr').not('#row0').remove();
or
$('#row0').siblings().remove();