SO - 18657106

by Arun P Johny

HTML

<table>
    <tr id="a" class="red"><td>test</td></tr>
    <tr id="b" class="red"><td>test</td></tr>
    <tr id="c" class="red"><td>test</td></tr>
    <tr id="d" class="red"><td>test</td></tr>
    <tr id="e" class="green"><td>test</td></tr>
    <tr id="f" class="blue"><td>test</td></tr>
</table>

JavaScript

//ids is an array of the element ids with class red
var ids = $('table .red').map(function(){
    return this.id
}).get();

console.log(ids)