Question

hi i want to loop through some tr’s like this .

<tr>
 <td> <input type="radio" id="r11"   value="a" name="r1_selectedobjects" /> </td>
   <td><input type="radio" id="r12"   value="b" name="r1_selectedobjects" /> <td>
</tr>
<tr>
   <td><input type="radio" id="r21"   value="a" name="r2_selectedobjects" /></td>
  <input type="radio" id="r22"   value="b" name="r2_selectedobjects" /></td>
</tr>
   <td><input type="radio" id="r31"   value="a" name="r3_selectedobjects" /></td>
   <td><input type="radio" id="r32"   value="b" name="r3_selectedobjects" /></td>
<tr>
<tr>
<td><input type="submit" id="matbutton" data-inline="true"  value="Submit" onclick="return CheckMatrixRadio(this);" /></td>
    </tr>

i can do this by $('tr').each(function(){});

i want to skip the 3 rd tr

this one

</tr>
   <td><input type="radio" id="r31"   value="a" name="r3_selectedobjects" /></td>
   <td><input type="radio" id="r32"   value="b" name="r3_selectedobjects" /></td>
<tr>

how to do this . think that i don’t know any calss or id names , only thing i know is index of my tr , in this case , 3

how to skip that tr in my each loop . please help………..

Answer 1

The each callback receives a zero-based index telling you which matched item you’re looking at, so:

$('tr').each(function(index){
    // If not the third one...
    if (index !== 2) {
        // ...do something
    }
});

If for any reason you don’t want to use each (you mentioned it in your question, but just covering bases) but instead want to create a jQuery instance with all the rows except the third one, the most efficient way I know is:

var rows = $('tr');
rows = rows.not(rows[2]);

…which removes the third row from the matched set via not. You could also achieve the same thing with a selector involving :not and :eq:

$('tr:not(:eq(2))')

…but then you’re requiring jQuery to process the selector rather than allowing it to pass the selector off to the browser’s querySelectorAll implementation (if it has one). *

Examples of all three

---

(Side note: If there are unrelated trs anywhere on the page, you may need to make your selector more specific to the group of rows you’re looking at.)

---

* PiTheNumber points out in his answer that $('tr:not(:nth-child(3))') should do it, too. And that’s useful because it has the advantage that both :not and :nth-child can be processed by the browser natively. Note that :nth-child uses 1-based indexes, and is very different from :eq — it checks which child an element is of its container, not whether it’s the nth matched element. Should work for a table with tr elements provided they’re all in the same tbody, though.