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button Event Attribute
Event Object
Definition and Usage
The button event attribute returns a number that indicates which mouse button was clicked when an event was triggered.
Syntax
event.button=0|1|2
| Parameter | Description |
|---|---|
| 0 | Specifies the left mouse-button |
| 1 | Specifies the middle mouse-button |
| 2 | Specifies the right mouse-button |
Note: Internet Explorer 8 and earlier has different parameters:
| Parameter | Description |
|---|---|
| 1 | Specifies the left mouse-button (IE8 and earlier) |
| 4 | Specifies the middle mouse-button (IE8 and earlier) |
| 2 | Specifies the right mouse-button |
Tips and Notes
Note: For left-handed configured mice the button parameter values are reversed.
Tip: Mozilla gives a Ctrl–Click a button value of 2 (same as right-click).
Example
Example
The following example alerts which mouse button was clicked:
<html>
<head>
<script type="text/javascript">
function whichButton(event)
{
if (event.button==2)
{
alert("You clicked the right mouse button!")
}
else
{
alert("You clicked the left mouse button!")
}
}
</script>
</head>
<body onmousedown="whichButton(event)">
<p>Click in the document. An alert box will
alert which mouse button you clicked.</p>
</body>
</html>
<head>
<script type="text/javascript">
function whichButton(event)
{
if (event.button==2)
{
alert("You clicked the right mouse button!")
}
else
{
alert("You clicked the left mouse button!")
}
}
</script>
</head>
<body onmousedown="whichButton(event)">
<p>Click in the document. An alert box will
alert which mouse button you clicked.</p>
</body>
</html>
Try it yourself »
Event Object
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W3Schools is optimized for learning, testing, and training. Examples might be simplified to improve reading and basic understanding.
Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.
While using this site, you agree to have read and accepted our terms of use and privacy policy.
Copyright 1999-2012 by Refsnes Data. All Rights Reserved.
Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.
While using this site, you agree to have read and accepted our terms of use and privacy policy.
Copyright 1999-2012 by Refsnes Data. All Rights Reserved.