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JavaScript HTML DOM - Changing HTML

The HTML DOM allows JavaScript to change the content of HTML elements.

Changing HTML Output Stream

JavaScript can create dynamic HTML content:

Today's date is:

In JavaScript, document.write() can be used to write directly to the HTML output stream.

Example

| | Never use document.write() after the document (DOM) has finished loading. This will overwrite the document. | | --- | --- |

Changing HTML Content

The easiest way to modify the content of an HTML element is by using the innerHTML property.

To change the content of an HTML element, use this syntax:

This example changes the content of a <p> element:

Example

<html>
<body>
<p id="p1">Hello World!</p>
<script>
document.getElementById("p1").innerHTML = "New text!";
</script>
</body>
</html>

This example changes the content of an <h1> element:

Example

Example explanation:

Changing HTML Attributes

To change the attribute of an HTML element, use this syntax:

This example changes the src attribute of an <img> element:

Example

Example explanation:

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