JavaScript setInterval() Method
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JavaScript setInterval() Method
The setInterval() method calls a function at specified intervals (in milliseconds).
Note: Unlike setTimeout(), the setInterval() method will continue calling the function until clearInterval() method is called, or the window is closed.
The following example will call the function (myCountDown()) for every second.
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<button onclick="myFunction()">Start Count Down</button>
<p id="point"></p>
<script>
var count = 0;
var x = document.getElementById("point");
function myFunction(){
setInterval(myCountDown, 1000)
}
function myCountDown(){
count = count + 1;
x.innerHTML = count;
}
</script>
</body>
</html>
Syntax
setInterval(function, gap, param1, ..., paramN);
//or
setInterval(function, gap);
Parameter Values
| Value | Type | Explanation |
|---|---|---|
| function | Required | Specifies a function to be executed. |
| gap | Optional | Specifies a time interval in millisecond. If omitted, the default value is 0. Note: 1000ms = 1sec. |
| param1, ..., paramN | Optional | Specifies the additional parameters to pass to the function. Param is not supported in IE9 and earlier. |
setInterval() with Self Function
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<button onclick="myFunction()">Start Count Down</button>
<p id="point"></p>
<script>
var count = 0;
var x = document.getElementById("point");
function myFunction(){
setInterval(function(){
count = count + 1;
x.innerHTML = count;
}, 1000)
}
</script>
</body>
</html>
setInterval() with Optional Parameter
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<button onclick="myFunction()">Start Count Down</button>
<p id="point"></p>
<script>
var count = 0;
var x = document.getElementById("point");
function myFunction(){
setInterval(myCountDown, 1000, myMessage())
}
function myCountDown(){
count = count + 1;
x.innerHTML = count;
}
function myMessage(){
alert("I will Execute once");
}
</script>
</body>
</html>
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