DOM element

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.

Instance

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文网(php.cn)</title>
</head>
<body>

<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>

</body>
</html>

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Example analysis:

This code creates a new <p> element:

var para=document.createElement(" p");

To add text to the <p> element, you must first create a text node. This code creates a text node:

var node=document.createTextNode("This is a new paragraph.");

Then you must add < The p> element appends this text node:

para.appendChild(node);

Finally you must 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 the existing element:

element.appendChild(para);

Delete existing HTML elements

The following code demonstrates how to delete elements:

Instance

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文网(php.cn)</title>
</head>
<body>

<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>

</body>
</html>

Run instance»

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Instance analysis

This HTML document contains a <div> element with two child nodes (two <p> elements):

<div id="div1">
<p id="p1">This is a paragraph. </p>
<p id="p2">This is another paragraph. </p>
</div>

Find the element with id="div1":

var parent=document.getElementById("div1" );

Find the <p> element with id="p1":

var child=document.getElementById("p1");

Remove child elements from parent elements:

parent.removeChild(child);

	It would be nice if I 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, then use its parentNode property to find the parent element:

var child=document.getElementById("p1");
child.parentNode.removeChild(child);

HTML DOM Tutorial

In our In the HTML DOM section of the JavaScript tutorial, you have learned:

How to change the content of an HTML element (innerHTML)
How to change an HTML element Styles (CSS)
How to react to HTML DOM events
How to add or remove HTML elements

If you want to learn more about accessing the HTML DOM using JavaScript, visit our complete HTML DOM tutorial.