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Window setInterval() Method

Window Object Reference 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

Internet Explorer Firefox Opera Google Chrome Safari

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>

Try it yourself »


Window Object Reference Window Object

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