获取jQuery中元素的第n个子编号 [英] get the nth-child number of an element in jquery

问题描述

我有一类包含多个"DIV"元素的元素，并且其中包含"p"元素的列表.见下文:

I have a class of multiple 'DIV' elements and inside it are list of 'p' elements. See below:

<div class="container">
    <p>This is content 1</p>
    <p>This is content 2</p>
    <p>This is content 3</p>
</div>
<div class="container">
    <p>This is content 1</p>
    <p>This is content 2</p>
    <p>This is content 3</p>
</div>

这是我通过悬停调用'p'元素的jQuery代码:

Here's my jQuery code on calling the 'p' elements through hover:

$('.container').children('p').hover(function(){
    //get the nth child of p from parent class 'container'
});

如何从其父容器类容器"中获取元素"p"的第n个子代号?

How can I get the nth child number of the element 'p' from its parent container class 'container'?

就像你悬停一样

这是内容1

This is content 1

应将输出触发为1；

推荐答案

您可以为此使用jQuery的 index函数 .它会告诉您给定元素相对于其同级元素的位置:

You can use jQuery's index function for that. It tells you where the given element is relative to its siblings:

var index = $(this).index();

在线示例 | 源

索引是从0开始的，因此，如果您要查找从1开始的索引(例如，第一个是1而不是0)，只需向其添加一个:

The indexes are 0-based, so if you're looking for a 1-based index (e.g., where the first one is 1 rather than 0), just add one to it:

var index = $(this).index() + 1;

---

如果您不使用jQuery并遇到此问题和答案(OP使用jQuery)，则没有它也很简单. nth-child仅考虑元素，因此:

---

If you're not using jQuery and came across this question and answer (the OP was using jQuery), this is also quite simple to do without it. nth-child only considers elements, so:

function findChildIndex(node) {
    var index = 1;                         // nth-child starts with 1 = first child
    // (You could argue that you should throw an exception here if the
    // `node` passed in is not an element [e.g., is a text node etc.]
    // or null.)
    while (node.previousSibling) {
        node = node.previousSibling;
        if (node && node.nodeType === 1) { // 1 = element
            ++index;
        }
    }
    return index;
}

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