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Asked: 2026-05-29T12:33:19+00:00

I want to extract a value from my hidden inputbox, by using javascript, but

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I want to extract a value from my hidden inputbox, by using javascript, but sometimes i am getting a “undefined” error and sometimes no output.
when i did 

alert(document.getElementById('hhh').value);

from inside a printIt() function i get the output. but i think somehow it is not going in to “var a”, and also 

var a =22;

works if i remove the

var a =document.getElementById('hhh').value;

in below code.

<script type="text/javascript">
var a =document.getElementById('hhh').value;
function startTime()
{

document.getElementById('txt').innerHTML=a;
a=a-1;
t=setTimeout('startTime()',600);
}
</script>

<body    onLoad="startTime()">
<form name="form1"   id="form11" method="post" action="">
<input type="hidden" id="hhh" name="time" value="11" />
</form>
<div id="txt"></div>
</body>

Any help would be appreciated.
Thanks.

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1 Answer

  1. Editorial Team

    var a =document.getElementById('hhh').value;

    This runs before the document is loaded so the underlying element may not exist in the DOM.

    You call document.getElementById('hhh') before hhh exists. Move it into a function you call onload.

    var a;
function setup() {
    a = document.getElementById('hhh').value;
    startTime();
}
function startTime() {
    document.getElementById('txt').innerHTML = a--;
    setInterval(startTime, 600);
}

    and run setup(); in your onload.

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