Detect If Scrollbars Visible

delraydog · May 19, 2005

Is there anyway to detect if scrollbars were made visible in a
textarea? I'm not talking about initial setting of the scrolling
attribute, but rather whether scrollbars have been added either
horizontally or vertically based on the users text input?

Thanks,
Cliff.

Randy Webb · May 19, 2005

Is there anyway to detect if scrollbars were made visible in a
textarea? I'm not talking about initial setting of the scrolling
attribute, but rather whether scrollbars have been added either
horizontally or vertically based on the users text input?

Nope. Well, maybe make the textarea just large enough for a scrollbar
and 1 character visible. But to make a textarea of significant size and
then determine if scrollbars are present, no.

RobB · May 19, 2005

Is there anyway to detect if scrollbars were made visible in a
textarea? I'm not talking about initial setting of the scrolling
attribute, but rather whether scrollbars have been added either
horizontally or vertically based on the users text input?

Thanks,
Cliff.

Have a play at this:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
</head>
<body>
<form>
<input type="text" name="sc" value="">
<br>
<textarea
rows="3"
cols="24"
wrap="soft"
onkeyup="
sH.value=a=this.scrollHeight;
oH.value=b=this.offsetHeight;
sW.value=c=this.scrollWidth;
oW.value=d=this.offsetWidth;
sc.value=(a>b||c>d)?'scrolling...':''"></textarea>
<hr>
<input type="text" name="sH" value="">__scrollHeight
<br>
<input type="text" name="oH" value="">__offsetHeight
<hr>
<input type="text" name="sW" value="">__scrollWidth
<br>
<input type="text" name="oW" value="">__offsetWidth
<hr>
</form>
</body>
</html>

Some sort of algorithm in there somewhere...

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Detect If Scrollbars Visible

delraydog

Randy Webb

RobB

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