HTML onload Attribute
Definition and Usage
The onload attribute fires when an object has been loaded.
onload is most often used within the <body> element to execute a script once a web page has completely loaded all content (including images, script files, CSS files, etc.). However, it can be used on other elements as well (see "Supported HTML tags" below).
For input elements, the onload attribute is only supported when <input type="image">
The onload attribute can be used to check the visitor's browser type and browser version, and load the proper version of the web page based on the information.
Applies to
The onload attribute is part of the Event Attributes, and can be used on the following elements:
| Elements |
|---|
| <body> |
| <iframe> |
| <img> |
| <input> |
| <link> |
| <script> |
| <style> |
Examples
Body Example
Execute a JavaScript immediately after a page has been loaded:
<body onload="myFunction()">
Try it Yourself »
Img Example
Using onload on an <img> element. Alert "Image is loaded" immediately after an image has been loaded:
<img src="w3html.gif" onload="loadImage()" width="100" height="132">
<script>
function loadImage() {
alert("Image is loaded");
}
</script>
Try it Yourself »
Input Example
Using onload on an <input type="image"> element. Alert "Image is loaded" immediately after an image has been loaded:
<input type="image" onload="loadImage()" src="img_submit.gif" alt="Submit">
<script>
function loadImage() {
alert("Image is loaded");
}
</script>
Try it Yourself »
Browser Support
The onload attribute has the following browser support for each element:
| Element | |||||
|---|---|---|---|---|---|
| body | Yes | Yes | Yes | Yes | Yes |
| iframe | Yes | Yes | Yes | Yes | Yes |
| img | Yes | Yes | Yes | Yes | Yes |
| input type="image" | Yes | Yes | Yes | Yes | Yes |
| link | Yes | Yes | Yes | Yes | Yes |
| script | Yes | Yes | Yes | Yes | Yes |
| style | Yes | Yes | Yes | Yes | Yes |
