Solutions to problems with the jquery selector [attribute=value]-JS Tutorial-php.cn

Solutions to problems with the jquery selector [attribute=value]

黄舟

Release： 2017-06-23 13:48:19

Original

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jquery Problem with attribute selector[attribute=value]

$("img").mouseenter(function (){ 
var bigimgsrc = $(this).attr(&#39;src&#39;);       
var liindex = $(this).siblings("ul").children("[datasrc=bigimgsrc]").index();
       alert(liindex);
       });

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The problem is: liindex is always -1;
So what’s wrong with my var liindex = $(this).siblings("ul").children("[datasrc=bigimgsrc]").index();? Please give me some advice.

"[datasrc=&#39;" + bigimgsrc + "&#39;]"

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I am usually used to using quotation marks, but I didn’t see it clearly at first. Variables You should use splicing.

The grammar is not wrong, check if there are any spelling errors. index() returns -1 if the element cannot be found, so is there a typo in the selector for children?

 <div>
        <img src="http://apeclass.cn/1212/img/photo_01.jpg">
        <ul>
            <li data-src="http://apeclass.cn/1212/img/photo_01.jpg"></li>
            <li></li>
            <li></li>
        </ul>
    </div>
    <div>
        <img src="http://apeclass.cn/1212/img/photo_02.jpg">
        <ul>
            <li></li>
            <li data-src="http://apeclass.cn/1212/img/photo_02.jpg"></li>
            <li></li>
        </ul>
    </div>
    <div>
        <img src="http://apeclass.cn/1212/img/photo_03.jpg">
        <ul>
            <li></li>
            <li></li>
            <li data-src="http://apeclass.cn/1212/img/photo_03.jpg"></li>
        </ul>
    </div>
    <script>
    $(&#39;img&#39;).mouseenter(function() {        var bigimgsrc = $(this).attr(&#39;src&#39;),
            liindex = $(this).siblings(&#39;ul&#39;).children("[data-src=&#39;" + bigimgsrc + "&#39;]").index()
        alert(liindex );
    });    </script>

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Explanation $(this).siblings("ul").children("[datasrc=bigimgsrc]") did not select any elements.

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