JavaScript setTimeout() Method
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JavaScript setTimeout() Method
The setTimeout() method starts a timer that executes a piece of code after the specified number of milliseconds have elapsed.
Note: Unlike setInterval(), the setTimeout() method will execute a function only once, after a specified number of milliseconds.
The following example will call the function (myFunction()) after 3 seconds.
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<p>Click the button and wait for 3 seconds.</p>
<button onclick="myFunction()">Click Me</button>
<script>
function myFunction(){
setTimeout(myDisplay, 3000)
}
function myDisplay(){
alert("I'm 3 seconds delay");
}
</script>
</body>
</html>
Syntax
setTimeout(function, delay, param1, ..., paramN);
//or
setTimeout(function, delay);
Parameter Values
| Value | Type | Explanation |
|---|---|---|
| function | Required | Specifies a function to be executed. |
| delay | Optional | Specifies a time delay 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. |
setTimeout() with Self Function
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<p>Click the button and wait for 3 seconds.</p>
<button onclick="myFunction()">Click Me</button>
<script>
function myFunction(){
setTimeout(function(){
alert("I'm 3 seconds delay");
}, 3000)
}
</script>
</body>
</html>
setTimeout() with Optional Parameter
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<p>Click the button</p>
<button onclick="myFunction()">Click Me</button>
<script>
function myFunction(){
setTimeout(myDisplay , 3000, sayHello())
}
function myDisplay(){
alert("I'm 3 seconds delay");
}
function sayHello(){
alert("Hello");
}
</script>
</body>
</html>
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