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Page scroll when using document.body.scrollTop

Posted on 2003-10-31
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Last Modified: 2010-08-05
Please check www.VisionSimulations.com. I want to show a full size image when the user clicks a thumbnail on the right. I want to show the image in the middle of the viewport, so I need to find out if the page is scrolled. Scroll down to the bottom of www.VisionSimulations.com and then click an image. You'll see that the page scrolls back to the top. It's as if positioning the ShowImagesDiv causes the page to scroll back. Below is the javascript.

Why does this happen and how can I prevent it?

Roger

function ShowImage(stPicture, iWidth, iHeight)
  {
  stPicture="url(" + stPicture + ")" ;
  iLeft = document.body.clientWidth/2-iWidth/2;
  document.getElementById("ShowImagesDIV").style.left=iLeft ;
  //document.getElementById("ShowImagesDIV").style.top=document.body.scrollTop + document.body.clientHeight/2 - iHeight/2;
  document.getElementById("ShowImagesDIV").style.top=document.body.scrollTop;
  document.getElementById("ShowImagesDIV").style.width=iWidth;
  document.getElementById("ShowImagesDIV").style.height=iHeight;
  document.getElementById("ShowImagesDIV").style.background=stPicture;
  document.getElementById("ShowImagesDIV").style.visibility="visible" ;
  return false;
  }
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Question by:rdavis101
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5 Comments
 
LVL 10

Expert Comment

by:NetGroove
ID: 9659296
I remember this question with the same site.
The solution was the ";retern false" suffix.

Did you ask this question before?

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LVL 10

Accepted Solution

by:
NetGroove earned 500 total points
ID: 9659320
I found your question:
http://oldlook.experts-exchange.com/Web/Web_Languages/JavaScript/Q_20733806.html

Could it be you are catching hits here?
Or do you remember Alsheimer?

0
 

Author Comment

by:rdavis101
ID: 9659365
You guys have a better memory than I do. Thanks.
0
 
LVL 10

Expert Comment

by:NetGroove
ID: 9659392
Oh, then please take my apologize for bad assumptions :)

Thanks for the points (in spite of my typo!)

See you,
NetGroove

0
 

Author Comment

by:rdavis101
ID: 9659407
Oops...I accepted the answer and just assumed I'd made a stupid mistake. But, that doesn't seem to be the case, since return false; is in the code.

So what's the deal?

Roger
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