如何通过 ID 获取 xhtml 元素？

Question

I am trying to get the xhtml element ID in javascript to change an element color when I click a button.我正在尝试获取 javascript 中的 xhtml 元素 ID，以在单击按钮时更改元素颜色。 I expect the browser to find an element added via an function other than querySelector and getElementById .我希望浏览器能够找到通过 function 添加的元素，而不是querySelector和getElementById 。

As a alternative to the dom default methods, I wrote this function to find element from the nodes tree.作为 dom 默认方法的替代方法，我编写了这个 function 从节点树中查找元素。 I it didn't worked because I used the wrong NodeFilters.我没有用，因为我使用了错误的 NodeFilters。

function findById(id) {
    const treewalker = document.createTreeWalker(document.body, NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_ATTRIBUTE 
        | NodeFilter.SHOW_TEXT, { acceptNode: function (node) { 
            return NodeFilter.FILTER_ACCEPT;
        } }, false);
    let node;
    let nodes = [];
    while (node = treewalker.nextNode())
        nodes.push(node);
    return nodes.filter(node => node.id === id);
}

Here is a minimum reproductable example of what I am trying to do.这是我正在尝试做的最小可复制示例。

 /* Display the foobar text (cannot be directly written in the html file) */ let foobar = document.createElement('p'); foobar.innerHTML = 'Foo bar'; foobar.id = 'foobar'; // foobar.setAttributeNS(null, 'id', 'foobar'); document.body.appendChild(foobar); function findById(id) { const treewalker = document.createTreeWalker(document.body, NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_ATTRIBUTE | NodeFilter.SHOW_TEXT, { acceptNode: function (node) { return NodeFilter.FILTER_ACCEPT; } }); let node; let nodes = []; while (node = treewalker.nextNode()) nodes.push(node); return nodes.filter(node => node.id === id); } function displayFoobar() { let e = findById('foobar'); setTimeout(function () { e.style.color = 'blue'; }, 1000); setTimeout(function () { e.style.color = 'black'; }, 2000); }

 <html> <head> <title>Test</title> </head> <body> <h1>Foo bar app</h1> <button onclick="displayFoobar();">display foobar</button> </body> </html>

Answer 1

Your code with document.getElementById working:您使用document.getElementById工作的代码：

 /* Display the foobar text (cannot be directly written in the html file) */ let foobar = document.createElement('p'); foobar.innerHTML = 'Foo bar'; foobar.id = 'foobar'; document.body.appendChild(foobar); function displayFoobar() { let e = document.getElementById('foobar'); setTimeout(function () { e.style.color = 'blue'; }, 1000); setTimeout(function () { e.style.color = 'black'; }, 2000); }

 <html> <head> <title>Test</title> </head> <body> <h1>Foo bar app</h1> <button onclick="displayFoobar();">display foobar</button> </body> </html>

如何通过 ID 获取 xhtml 元素？

问题描述

1 个解决方案

解决方案1
1 2022-02-04 00:52:36

如何通过 ID 获取 xhtml 元素？

问题描述

1 个解决方案

解决方案1 1 2022-02-04 00:52:36

解决方案1
1 2022-02-04 00:52:36