get count of diagonal td jquery

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how can i select all diagonal cells(td) using jquery selector , suppose i have a nxn table and i want to select both '/' and '\' diagonals cells separately.

some thing like this

function getLDCount()
{
return $("#mytable td").......length
}

function getRDCount()
{
return $("#mytable td")..........length
}

Posted 25-Aug-12 18:38pm

agha_ali22

Updated 25-Aug-12 19:01pm

v2

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2 solutions

Solution 2

try this.

JavaScript

$('#tableId tr').each(function(index){
       if ($(this).find('td:eq(' + (index) + ')').length == 1)
      a ++;
        var  tdLength = $(this).find('td').length;
      // alert(tdLength );

       if ($(this).find('td:eq(' + (tdLength - 1 - index) + ')').length == 1)
      b ++;


   });
   $("#mybutton").click(function(){
       alert(a);
       alert(b)
   });

Posted 5-Nov-12 22:58pm

deepak.m.shrma

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Karthik. A · Accepted Answer · 2012-08-25T19:14:00

Solution 1

As the table is N x N - the length is obviously going to be N. To get the diagonal cells, the following logic would work:

Left to right:

You just need the cell whose index is equal to the row index

Right to left:

This is a bit involved than left to right. The following equation would get you the required cells:= N - 1 - Row<index>

Here is a jsfiddle for the same!

http://jsfiddle.net/kFP4D/[^]

Hope this helps!

Posted 25-Aug-12 19:14pm

Karthik. A

Updated 25-Aug-12 19:16pm

v2

Comments

agha_ali22 26-Aug-12 1:20am

lets suppose we have 5x5 table now can we use any jquery selector

Karthik. A 26-Aug-12 1:24am

The jquery I've written will work for any N x N table. Try it out by adding a 4th & 5th column and a 4th & 5th row to that example!