Where am I on the page?

[MartinSmith]

Some of the pages on my site are dynamically generated and may be quite long.

It occurred to me that if I put something similar to below on the bottom of my page I could check whether the page extended below the bottom of the Client's screen and provide a link to the top if it did.

<P id=BenchMark name=BenchMark></P>
<SCRIPT LANGUAGE=javascript>
<!--
if (window.BenchMark.style.top>screen.availHeight)
{window.document.write("<A href='javascript: void(0)' onclick='return window.scrollTo(0,0)'>Go To Top</A>")}
//-->
</SCRIPT>

Unfortunately however window.BenchMark.style.top just returns a blank string.

Can anyone else think of a way of doing this client side?

[MartinSmith]

OK I have now given up on the above idea and am using this instead.

<SCRIPT LANGUAGE=javascript>
<!--
var oApp = navigator.appName;
 
var ie = (oApp.indexOf("Microsoft")!=-1);
 
if (ie){
if (document.body.scrollHeight>screen.availHeight)
{window.document.write("<A href='javascript: void(0)' onclick='return window.scrollTo(0,0)'>Go To Top</A>")}
}
else{
if (window.document.body.offsetHeight>screen.availHeight)
{window.document.write("<A href='javascript: void(0)' onclick='return window.scrollTo(0,0)'>Go To Top</A>")}
}
</SCRIPT>

Unfortunately it doesn't work on Netscape 4 any ideas?

[CiberTHuG]

*shudder* I give up. Can someone give me a JavaScript manual. I really need to know why people write pages like this.

[scoutt]

try what is in bold

<SCRIPT LANGUAGE=javascript>
<!--
var oApp = navigator.appName;
 
var ie = (oApp.indexOf("Microsoft")!=-1);
 
if (ie){
if (document.body.scrollHeight>screen.availHeight)
{window.document.write("<A href='javascript: void(0)' onclick='return window.scrollTo(0,0)'>Go To Top</A>")}
}
else{
if (window.document.body.offsetHeight>screen.availHeight)
{window.document.[b]writeln[/b]("<A href='javascript: void(0)' onclick='return window.scrollTo(0,0)'>Go To Top</A>")}
}
</SCRIPT>

[CiberTHuG]

Uhm, the page may be severly broken, Scoutt, but that isn't it. document.writeln() appends a newline where document.write() doesn't. Since new lines do not matter....

[MartinSmith]

Hmm, it appears from http://developer.irt.org/script/1400.htm that I would need to stick it all into a layer which isn't really suitable for me so looks like NS 4.0 users are just going to have to scroll to the top manually.

Scoutt thank you very much for your help.

CiberTHuG - What possible objection can you have to people displaying a Scroll to Top hyperlink when the page is longer than the screen?

Is it the principle or do you think my solution is badly coded?

If the latter please put up or shut up!

[CiberTHuG]

Putting up:

ECMA-262
getElementById()
document is not part of window

[MartinSmith]

You're right of course but I am not getting any problems with Level 1 DOM browsers.

My problem is with netscape 4.0 which as far as I know has never heard of getElementById()

[CiberTHuG]

True that.

[scoutt]

Sorry I wasn't much of help. I pretty much guessed at that. it looked good though.

I haven't studied javascript or even worite my own. so I am not that versed in it.