Javascript: Selecting an elment with a class within an element with an id

[noahgelman]

I’ve tried the following but that didn’t work. No jQuery.

document.getElementById('theId').getElementsByClassName('theClass');

Turns out this WAS selecting it properly. Something else in my code was broken

[Senff]

You’ll have to use an index number, to indicate which one of the found elements with that class you want to target. This will select the first one:

document.getElementById('theId').getElementsByClassName('theClass')[0];

I’ve never figured out how to select all classes with getElementsByClassName, so that’s why jQuery is so great.

[jamygolden]

Note: getElementsByClassName doesn’t have great browser support

[Author]

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