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With Javascript you can execute functions or statements not immediately but after a specified time interval. The two methods (of the HTML DOM Window object) are: - setTimeout() - execute a code some time in the future
- clearTimeout() - cancel the setTimeout()
setTimeout()
Sintax:
var t=setTimeout(function, delay*) *(in milliseconds: 2 seconds = 2 * 1000)
setTimeout() returns a value we have stored in the 't' variable. You can refer to this value if you want to cancel the setTimeout().
The first parameter is a string containing a Javascript statement or function.
The second parameter specifies how many milliseconds you want to delay the your function or statement.
The example below shows a message after a 5 seconds delay var t=setTimeoout("alert('5 seconds')",5000);
clearTimeout()
Sintax: clearTimeout(setTimeout_variable) example: <html>
<head>
<script type="text/javascript">
var t
function time(){
setTimeout("alert()",5000);
}
function stoptime(){
clearTimeout(t);
}
</script>
</head>
<form>
<input type="button" value="count" onClick="time()"><br>
<input type="button" value="stop" onClick="stoptime()">
</form>
</html> This example shows the two timing functions: the first button starts a 5 second delay before an alert message and the second one stops this counter cleaning the operation.
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