在 MouseEvent 上找到 NodeList 中的确切位置

Question

似乎很明显，但找不到 solution.I 有几个 Div 具有相同的 class，当您将鼠标悬停在它们上面时，我想知道您是哪一个准确悬停，作为 NodeList 位置值。

HTML

<div id="summary">

    <div class="articles"></div>
    <div class="articles"></div>
    <div class="articles"></div>
    <div class="articles"></div>
    <div class="articles"></div>
    <div class="articles"></div>
    <div class="articles"></div>

</div>

JS

let articles = document.querySelectorAll(".articles");

    for (let x of articles) {

        x.addEventListener('mouseenter', (e) => {

            p = Exact Position in Nodelist??
    
            console.log(articles[p]);

        });
    }

谢谢。

Answer 1

你应该获取父节点的子节点并找到它的索引，如下所示。

试试这个

let articles = document.querySelectorAll(".articles");

for (let x of articles) {
  x.addEventListener("mouseenter", (e) => {
    console.log([...e.target.parentNode.children].indexOf(e.target));
  });
}

代码沙箱 => https://codesandbox.io/s/young-frost-x6u1x?file=/src/index.js

Answer 2

这是我想出的一个简单的解决方案：

let articles = document.querySelectorAll(".articles");

for (let [position, article] of articles.entries()) {
 
  article.addEventListener('mouseenter', (e) => {
    
    console.log(position) // Exact Position in Nodelist
    console.log(articles[position]) // The Node hovered

  });

}

希望我的帮助有用。

Answer 3

您可以在父级上使用鼠标悬停，这样您只会添加一个侦听器：

let articles = document.querySelectorAll(".articles");
var summary = document.getElementById("summary");
summary.addEventListener("mouseover", (e) => {
  if (e.target.classList.contains("articles")) {
    let position = Array.from(e.target.parentNode.children).indexOf(e.target);
    console.log(position,articles[position]);
  }
});

.articles {
  width: 100px;
  height: 100px;
  border: solid 1px red;
}

<div id="summary">

  <div class="articles">a</div>
  <div class="articles">b</div>
  <div class="articles">c</div>
  <div class="articles">d</div>
  <div class="articles">e</div>
  <div class="articles">f</div>
  <div class="articles">g</div>

</div>

在 MouseEvent 上找到 NodeList 中的确切位置

Find exact Position in NodeList on MouseEvent

javascript

html

mouseevent