Window clearTimeout() Method

Example

Prevent the function set with the setTimeout() to execute:

var myVar;

function myFunction() {
myVar = setTimeout(function(){ alert("Hello"); }, 3000);
}

function myStopFunction() {
clearTimeout(myVar);
}

Try it Yourself »

More "Try it Yourself" examples below.

Definition and Usage

The clearTimeout() method clears a timer set with the setTimeout() method.

The ID value returned by setTimeout() is used as the parameter for the clearTimeout() method.

Note: To be able to use the clearTimeout() method, you must use a global variable when creating the timeout method:

myVar = setTimeout("javascript function",milliseconds);

Then, if the function has not already been executed, you will be able to stop the execution by calling the clearTimeout() method.

Browser Support

The numbers in the table specify the first browser version that fully supports the method.

Method
clearTimeout()	1.0	4.0	1.0	1.0	4.0

Syntax

clearTimeout(id_of_settimeout)

Parameter Values

Parameter	Description
id_of_settimeout	Required. The ID value of the timer returned by the setTimeout() method

Technical Details

Return Value:	No return value

More Examples

Example

The following example has a "Start count!" button to start a timer, an input field that will count forever, and a "Stop count!" button that will stop the timer:

<button onclick="startCount()">Start count!</button>
<input type="text" id="txt">
<button onclick="stopCount()">Stop count!</button>

<script>
var c = 0;
var t;
var timer_is_on = 0;

function timedCount() {
    document.getElementById("txt").value = c;
    c = c + 1;
    t = setTimeout(function(){timedCount()}, 1000);
}

function startCount() {
    if (!timer_is_on) {
        timer_is_on = 1;
        timedCount();
    }
}

function stopCount() {
    clearTimeout(t);
    timer_is_on = 0;
}
</script>

Try it Yourself »

Window Object: href="met_win_settimeout.html">setTimeout() Method

Window Object: href="met_win_setinterval.html">setInterval() Method

Window Object: href="met_win_clearinterval.html">clearInterval() Method

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