Select element unless it has an ancestor of a give

问题:

Suppose I have the following HTML:

<div class="foo">
  <ul>
    <li>One</li>
    <li>Two</li>
  </ul>
</div> <!-- not originally here -->
<div class="bar">
  <ul>
    <li>Three</li>
    <li>Four</li>
  </ul>
</div>

I want to select all li elements that are not descendants of an element with class foo. I know I can do it with a fancy filter function, but I'm wondering whether I can do it with just a selector. First I tried:

$(":not(.foo) li")

Unfortunately this doesn't work since the li has other ancestors without the style (the ul in this case). The following seems to work;

$(":not(.foo) :not(.foo) li")

In other words, select all li elements that have no ancestor that either has class foo or has an ancestor of its own with class foo. Perhaps this is the best/only way to do it with a selector, but I'm not thrilled about the repetition of the :not selector. Any better ideas out there?

fiddle

回答1:

You can do it like this

$("li").not('.foo li')

http://jsfiddle.net/y7s54/

or

$("li:not(.foo li)")

http://jsfiddle.net/QpCYY/

Select all li's that don't have an ancestor with class foo

回答2:

Try li:not(.foo > ul > li); that selects all lis minus those with a parent .foo two levels up.

回答3:

You can do it using context along with selector as under,

$('li', $('div:not(.foo)'))

LIve Demo

$('li', $('div:not(.foo)')).each(function(){
    alert($(this).text());
});​

回答4:

How about this:

$("li:not(.foo > li)")

The comments in the docs are quite useful if this doesn't work:

http://api.jquery.com/not-selector/

回答5:

I think this solution looks a little nicer, but there's a bit of controversy on the API comments about speed differences.

$("li").not(".foo li")

fiddle