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 Below example changes the background color of the <body> element:

Example

<html>
<body>

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

</body>
</html>

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 Below example changes the text of a <p> element:

Example

<html>
<body>

<p id="p1">Hai Everyone</p>

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

</body>
</html>

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

Example

<html>
<body>

<input type="button" onclick="document.body.bgColor='lavender';"
value="Change background color" />

</body>
</html>

Change the Text of an Element - with a Function

The Below 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">Hai Everyone</p>
<input type="button" onclick="ChangeText()" value="Change text" />
</body>
</html>

Using the Style Object

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

The Below 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>

Change the font and color of an Element

The Below 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">Hai Everyone</p>
<input type="button" onclick="ChangeStyle()" value="Change style" />
</body>
</html>

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