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The onload attribute fires when an object has been loaded."
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.
The onload attribute is part of the Event Attributes, and can be used on the following elements:
Execute a JavaScript immediately after a page has been loaded:
<body onload="myFunction()">
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>
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>
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 |