'document.getElementById(' ') is null error' Thread RSS Feed

document.getElementById(' ') is null error

Thu, 03 Dec 2009 00:48:02 -0700

Hello,
i got an error on my php page.my code is bellow.

<?php
$year = $_GET['year'];
$month = $_GET['month'];
$day = $_GET['day'];

?>

<script type="text/javascript">
function GetCount(y,m,d){

/* Here is some logic and get output on 'out'. */

out = "some result";
document.getElementById('countbox').innerHTML=out;

}
}

</script>

<script type="text/javascript" >
GetCount('<?php echo $year; ?>','<?php echo $month; ?>','<?php echo $day; ?>');
</script>

<div id="countbox"></div>

and bellow is my url.

countdown.php?year=2009&month=12&day=19

in this code i got an javascript error."document.getElementById('countbox')is null".
please help me.

Re: document.getElementById(' ') is null error

Sun, 06 Dec 2009 12:19:21 -0700

The code is ran before countbox is initialized. You need to run it after the page has loaded.

<script type="text/javascript" >
function DoGetCount()
{
  GetCount('<?php echo $year; ?>','<?php echo $month; ?>','<?php echo $day; ?>');
}
window.onload=DoGetCount;
</script>

Re: document.getElementById(' ') is null error

Tue, 29 Dec 2009 00:45:23 -0700

Hello,

anthrax11 is right. Your code is running before the initialization the countbox. First you declare the variable and then declare the values.

Regards,
Olivia

Web Security & Video Conference UK