jQuery form input select by id

Question

Code

<form id='a'>
  <input id='b' value='dave'>
</form>

Question

How do I get the value from input 'b' while at the same time make sure it is inside 'a' (something like $('#a:input[id=b]')).

I only ask because I might have other inputs called 'b' somewhere else in my page and I want to make sure I'm getting the value from the correct form.

Answer 1

You can just target the id directly:

var value = $('#b').val();

If you have more than one element with that id in the same page, it won't work properly anyway. You have to make sure that the id is unique.

If you actually are using the code for different pages, and only want to find the element on those pages where the id:s are nested, you can just use the descendant operator, i.e. space:

var value = $('#a #b').val();