Select first sibling

Question

I'm trying to select the inner value of the first sibling - using jQuery - in an environment where I cannot alter the html markup.

I have the following:

<tr>
    <td>3</td>
    <td>bob</td>
    <td>smith</td>
    <td>[email protected]</td>
    <td>
        <img src="bobsmith.png" onclick="doSomething()" />
    </td>
</tr>

I'm trying to get the value of the first <td> with the following:

function doSomething() {
    var temp = $(this).parent().parent().children().filter(':first');
    alert("you clicked person #" + temp.html());
}

All I get from this is null.

I've tried various combinations with with the .siblings() function too, but to no avail.

Any ideas?

Thanks,

Note: I forgot to mention that the table the excerpt is from is dynamically loaded & refreshed from an ajax call. This may be pertinent for suggestions that include binds.

Solution: I've gone with the following solution, inspired by the accepted answer:

<tr>
    <td>3</td>
    <td>bob</td>
    <td>smith</td>
    <td>[email protected]</td>
    <td>
        <img src="bobsmith.png" onclick="doSomething(this)" />
    </td>
</tr>

and for the jQuery javascript:

function startStopNode(el) {
    var temp = $(el).parent().siblings(':first').html();
    alert("you clicked: " + temp);
}

Answer 1

$( 'td:first-child', $( this ).parents ( 'tr' ) ).html ();

This will select the first TD element (:first-child filter) in the parent TR of the image. parents() returns all parents of the element, and we filter the parents so that only TR elements are returned.

Also try writing your image like so:

<img src="bobsmith.png" onclick="doSomething(this)" />

and your function like so:

function doSomething ( imgEl ) {
}

and use imgEl instead of this