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Home » JavaScript » How to set delay time in JavaScript

How to set delay time in JavaScript

In this article you will get the knowledge of how to execute a code after a specified amount of time.

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Introduction:

 

In this article you will learn how the delay time is being set in JavaScript. Timeouts are like a timer. It can allow you to execute a section of code after a specified amount of time has passed. If any user wants to display the output after some time then you will set time as follows:

 

Syntax:

 

setTimeout("function expression",delaytime)

 

The delaytime is entered as milliseconds (1 second=1000 millisecond).

 

Example: In this example you will see how to display an alert box automatically after some time.

 

<html>

  <head>

    <title>Time in alert box</title>

  </head>

  <script type="text/javascript">

  function timedMsg()

  {

    var t=setTimeout("alert('Welcome to dotnetheaven.com')",4000)

  }

  </script>

  <body>

    <input type="button" value="Display Timed alertbox!"  onClick = "timedMsg()">

    <form>

      <p>

        <font color="maroon">

        Click on the button. An alert box will be displayed after 4 seconds.

        </font>

      </p>

    </form>

  </body>

</html>

 

Once the button is activated, the OnClick event goes to the function called "timedMsg". The function creates an ALERT box to appear after 4 seconds.

 

Output: Output of this script is as follows:

 

 

 

Figure 1: Output of the above script.

 

When you click on "Display timed alertbox" button then alert box will open after four second (see figure 2).

 

 

 

Figure 2: Display alert box after four second.

 

In this example I have set delaytime for four second (4000 milliseconds). So the alert box will display after four second.

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Purushottam Rathore

I am working as a Software Developer and has 4 years of experience on Microsoft Technology and having a Master Degree in Computer Application. I really like to work in the .NET platform. and working with ASP.NET 2.0/3.5, Web Services, WPF, WCF, Silverlight, AJAX, JavaScript, JQuery, Ado.net, MsAccess, SQL Server 2005/2008.

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 Comments
JavaScript Delay by Binod On July 1, 2009

Very nice tutorial. But there is one more way to put the delay in javascript function using false looping. Check this below code

function pauseJS(timeInMilliS) {
var date = new Date();
var curDate = null;
do { curDate = new Date(); }
while(curDate-date < timeInMilliS);
}

source: http://binodservlet.blogspot.com/2009/06/how-to-set-wait-in-javascript.html

Thanks,

Binod Suman

http://binodsuman.blogspot.com

Reply | Email | Modify 
Re: JavaScript Delay by Purushottam On July 1, 2009
Thanks Binod
Ur article is very nice.
Reply | Email | Modify 
Re: Re: JavaScript Delay by vince On July 30, 2010
Could this also work for creating a delay in a looped event, such as a random image program?
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