Get Index Of Element Within UL

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Using jQuery, I\'d like to be able to get the index of the li where the contained anchor tag\'s HREF equals \"#All\". (In this case the correct result would be 3)

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北恋

2020-12-16 18:18

You want to get an element's index inside another context, as part of a set of elements. See index() in the API documentation for more information, particularly the examples.

<script type="text/javascript">
$(document).ready(function(){

    var which_index = $("#tabs ul li a").index($("a[href='#All']"));
    alert(which_index);
});
</script>

<body>
<div id="tabs">
    <ul>
        <li><a href="#CPU"><span>CPU</span></a></li>
        <li><a href="#Pickup"><span>Pickup</span></a></li>
        <li><a href="#Breakfix"><span>Breakfix</span></a></li>
        <li><a href="#All"><span>All</span></a></li>
    </ul>
</div>
</body>

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旧巷少年郎

2020-12-16 18:25
This should do it:
```
var index = $("#tabs ul li").index($("li:has(a[href='#All'])"));
```
- You were selecting all <ul> instead of all <li>s you wanted to get the index out of.
- You have to check if the <li> element :has a link with what you want by using the :has selector, otherwise the matched element will be the <a> itself instead of the <li>.
Tested the above and it gives me the correct answer, 3, as the index is 0-based.
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耶瑟儿～

2020-12-16 18:29
I think it's because your first rule is matching all UL elements, when you want it to match all LI elements. Try:
```
$("#tabs ul li").index($("li a[href='#All']"))
```
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