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Window setInterval() Method
Window Object
Definition and Usage
The setInterval() method calls a function or evaluates an expression at specified intervals (in milliseconds).
The setInterval() method will continue calling the function until clearInterval() is called, or the window is closed.
The ID value returned by setInterval() is used as the parameter for the clearInterval() method.
Tip: 1000 ms = 1 second.
Syntax
setInterval(code,millisec,lang)
| Parameter | Description |
|---|---|
| code | Required. The function that will be executed |
| millisec | Required. The intervals (in milliseconds) on how often to execute the code |
| lang | Optional. JScript | VBScript | JavaScript |
Browser Support
The setInterval() method is supported in all major browsers.
Example
Example
Call the clock() function every 1000 millisecond. The clock() function updates the clock. The example also have a button to stop the clock:
<html>
<body>
<input type="text" id="clock">
<script language=javascript>
var int=self.setInterval(function(){clock()},1000);
function clock()
{
var d=new Date();
var t=d.toLocaleTimeString();
document.getElementById("clock").value=t;
}
</script>
<button onclick="int=window.clearInterval(int)">Stop</button>
</body>
</html>
<body>
<input type="text" id="clock">
<script language=javascript>
var int=self.setInterval(function(){clock()},1000);
function clock()
{
var d=new Date();
var t=d.toLocaleTimeString();
document.getElementById("clock").value=t;
}
</script>
<button onclick="int=window.clearInterval(int)">Stop</button>
</body>
</html>
Try it yourself »
Window Object
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