Question

I want if empty between tag ul alert hello. how is it?

<button class="click">Click</button><p>

<span>
    <ul></ul>
</span>

js:

$('.click').click(function() {
    if('span ul' == ''){alert('hello')};
});

EXAMPLE: http://jsfiddle.net/KDAwP/1/

Answer 1

Try this using jQuery :empty selector which selects empty elements. An empty element is an element without child elements or text.

$('.click').click(function() {
    if($('ul:empty').length){alert('hello')};
});

jQuery is not finding ul inside a span tag. Actually you should not have ul inside a span tag.

Try this fiddle it works perfectly fine.

http://jsfiddle.net/KDAwP/6/