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HTML DOM - Change HTML Elements

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HTML elements can be changed using JavaScript, the HTML DOM and events.

Change an HTML Element

HTML DOM and JavaScript can change the inner content and attributes of HTML elements.

The following example changes the background color of the <body> element:

Example

<html>
<body>

<script type="text/javascript">
document.body.bgColor="yellow";
</script>

</body>
</html>

Try it yourself »

Change the Text of an HTML Element - innerHTML

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

The following example changes the text of a <p> element:

Example

<html>
<body>

<p id="p1">Hello World!</p>

<script type="text/javascript">
document.getElementById("p1").innerHTML="New text!";
</script>

</body>
</html>

Try it yourself »

Change an HTML Element Using Events

An event handler allows you to execute code when an event occurs.

Events are generated by the browser when the user clicks an element, when the page loads, when a form is submitted, etc.

You can read more about events in the next chapter.

The following example changes the background color of the <body> element when a button is clicked:

Example

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Change the Text of an Element - with a Function

The following example uses a function to change the text of the <p> element when a button is clicked:

Example

<html>
<head>
<script type="text/javascript">
function ChangeText()
{
document.getElementById("p1").innerHTML="New text!";
}
</script>
</head>

<body>
<p id="p1">Hello world!</p>
<input type="button" onclick="ChangeText()" value="Change text" />
</body>
</html>

Try it yourself »

Using the Style Object

The Style object of each HTML element represents its individual style.

The following example uses a function to change the style of the <body> element when a button is clicked:

Example

<html>
<head>
<script type="text/javascript">
function ChangeBackground()
{
document.body.style.backgroundColor="lavender";
}
</script>
</head>

<body>
<input type="button" onclick="ChangeBackground()"
value="Change background color" />
</body>
</html>

Try it yourself »

Change the font and color of an Element

The following example uses a function to change the style of the <p> element when a button is clicked:

Example

<html>
<head>
<script type="text/javascript">
function ChangeStyle()
{
document.getElementById("p1").style.color="blue";
document.getElementById("p1").style.fontFamily="Arial";
}
</script>
</head>

<body>
<p id="p1">Hello world!</p>
<input type="button" onclick="ChangeStyle()" value="Change style" />
</body>
</html>

Try it yourself »

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