The Document Object Model (DOM) is a standard programming interface recommended by the W3C organization for processing extensible markup languages. On a web page, the objects that organize the page (or document) are organized in a tree structure. The standard model used to represent the objects in the document is called DOM. In this chapter, we will share with you how to add or delete HTML dom elements. Tutorial, come and learn now.
Create a new HTML element
To add a new element to the HTML DOM, you must first create the element (element node ), and then appends the element to an existing element.
<div id="div1"> <p id="p1">这是一个段落。</p> <p id="p2">这是另一个段落。</p> </div> <script> var para=document.createElement("p"); var node=document.createTextNode("这是一个新段落。"); para.appendChild(node); var element=document.getElementById("div1"); element.appendChild(para); </script>
This code creates a new
element:
var para=document.createElement("p");
To add text to a
element, you must first create a text node. This code creates a text node:
var node=document.createTextNode("这是一个新段落。");
Then you have to append the text node to the
element:
para.appendChild(node);
Finally you have to append the new element to an existing element .
This code finds an existing element:
var element=document.getElementById("div1");
The following code adds a new element after an existing element:
element.appendChild(para);
Delete existing HTML Element
<div id="div1"> <p id="p1">这是一个段落。</p> <p id="p2">这是另一个段落。</p> </div> <script> var parent=document.getElementById("div1"); var child=document.getElementById("p1"); parent.removeChild(child); </script>
It would be nice if you could delete an element without referencing the parent element.
But it’s a pity. The DOM needs to know the element you need to delete, and its parent element.
This is a common solution: find the child element you wish to remove, and then use its parentNode attribute to find the parent element:
var child=document.getElementById("p1"); child.parentNode.removeChild(child);
The above is a related tutorial on adding or removing HTML dom elements , hope it can help everyone.
Related recommendations:
How to use DOM to allocate events
The difference between empty and remove in DOM node deletion
jQuery’s method of manipulating DOM
The above is the detailed content of Add or remove HTML dom elements. For more information, please follow other related articles on the PHP Chinese website!

本篇文章带大家了解一下HTML(超文本标记语言),介绍一下HTML的本质,HTML文档的结构、HTML文档的基本标签和图像标签、列表、表格标签、媒体元素、表单,希望对大家有所帮助!

不算。html是一种用来告知浏览器如何组织页面的标记语言,而CSS是一种用来表现HTML或XML等文件样式的样式设计语言;html和css不具备很强的逻辑性和流程控制功能,缺乏灵活性,且html和css不能按照人类的设计对一件工作进行重复的循环,直至得到让人类满意的答案。

总结了一些web前端面试(笔试)题分享给大家,本篇文章就先给大家分享HTML部分的笔试题(附答案),大家可以自己做做,看看能答对几个!

HTML5中画布标签是“<canvas>”。canvas标签用于图形的绘制,它只是一个矩形的图形容器,绘制图形必须通过脚本(通常是JavaScript)来完成;开发者可利用多种js方法来在canvas中绘制路径、盒、圆、字符以及添加图像等。

html5废弃了dir列表标签。dir标签被用来定义目录列表,一般和li标签配合使用,在dir标签对中通过li标签来设置列表项,语法“<dir><li>列表项值</li>...</dir>”。HTML5已经不支持dir,可使用ul标签取代。

在html中,document是文档对象的意思,代表浏览器窗口的文档;document对象是window对象的子对象,所以可通过“window.document”属性对其进行访问,每个载入浏览器的HTML文档都会成为Document对象。

html5支持boolean值属性;boolean值属性指是属性值为true或者false的属性,如input元素中的disabled属性,不使用该属性表示值为flase,不禁用元素,使用该属性可以不设置属性值表示值为true,禁用元素。


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