Jquery get element containing child element with specific html value

Question

I would like to use Jquery to add a class to "li" element that contains a "span" element with a html/val equal to zero.

For Example if my code looks like this:

<ul>
    <li><span>Item 1</span><span class="num">30</span></li>
    <li><span>Item 2</span><span class="num">0</span></li>
    <li><span>Item 3</span><span class="num">20</span></li>
</ul>

I want to change it to the following:

<ul>
    <li><span>Item 1</span><span class="num">30</span></li>
    <li class="disabled"><span>Item 2</span><span class="num">0</span></li>
    <li><span>Item 3</span><span class="num">20</span></li>
</ul>

In the past I have used code to check elements attribute values, but never their html/val doing something to this effect...

$('li').has('span.num').addClass('disabled');

However in this case that would result in:

<ul>
    <li class="disabled"><span>Item 1</span><span class="num">30</span></li>
    <li class="disabled"><span>Item 2</span><span class="num">0</span></li>
    <li class="disabled"><span>Item 3</span><span class="num">20</span></li>
</ul>

Which is obviously not going work... Thanks

Answer 1

This should do what you want.

$('li').each(function(){
    if( $(this).find('span.num').text() == '0' ) $(this).addClass('disabled')
});

JS Fiddle

I would have suggested the following:

$('li').has('span.num:contains(0)').addClass('disabled')

But it doesn't work, as it checks if the value exists inside the html — not for an exact match. In this case, each of the span.num elements have a 0 in them, so every li would get the selected class. There doesn't seem to be an :equals() counterpart to the :contains() selector.