Question

how to dynamically resize div height with js/css

Asked by: jmoriarty

hey folks,

How would I go about dynamically resizing an element based on a user's browser/screen size? Basically, I have a page with a footer element 100px in height. the footer is a white background against a black background body. I want to increase the footer in height when the user resizes the browser so the white background footer continues for the overflow portion, if that makes sense.

Here's a copy of the mock up I'm working with. Ignore the god-awful coloring used for illustration purposes; and I made each style in-line for easy reading.


Thanks!

<html>
<body style="color:red;background-color:black">
 
<!-- begin background-header wrapper div -->
<div id="appheader_wrapper" style="	width: 100%;height: 170px;border-bottom:1px solid red; background-color: white;position:relative;top:0;left:0">
 
<!-- begin header content wrapper div -->
<div id="" style="position:relative; z-index:5; top:0; width:925px; height:170px; margin-left: auto; margin-right: auto; text-align: right; border:1px solid fuchsia; background-color:white">
 
 
<!-- begin welcome wrapper div -->
	<div style="height:25px; text-align:right; margin-top:3px; position:relative; border:1px solid pink">
	
	<div style="height:20px; width:10%; text-align:right;  position:relative; border:1px solid pink;float:right">
	contact
	</div>
	<div style="height:20px; width:10%; text-align:right; position:relative; border:1px solid green;float:right">
	welcome
	</div>
 
</div> <!-- end welcome wrapper div -->
 
<!-- begin shopping cart div -->
<div style="height:20px; width:100%; text-align:right;  position:relative; border:1px solid red;">
	view cart
	</div> <!-- end shopping cart div -->
 
<!-- BEGIN LOGO DIV -->
<div style="height:80px; width:100%; text-align:center;  position:relative; border:1px solid red;">
	logo
	</div> 
<!--END LOGO DIV-->
 
<!--BEGIN NAV BAR-->	
<div style="height:30px; width:100%; text-align:left;  position:relative; border:1px solid teal">
 
</div> 
<!--END NAV BAR-->
 
 
 
 
</div> <!-- end header content wrapper -->
</div> <!-- end background-header wrapper -->
 
<!-- MAIN CONTENT WRAPPER -->
<div style="position:relative;width:925px;height:600px;margin-left: auto; margin-right: auto; text-align:left;border:1px solid red">
 
</div><!-- END MAIN CONTENT WRAPPER -->
 
<!-- FOOTER FOOTER -->
<div id="appfooter_wrapper" style="width: 100%; height:100px; overflow:hidden; border-bottom:1px solid red; background-color: white;position:relative;top:0;left:0">
<!-- FOOTER CONTENT -->
<div style="position:relative;width:925px;height:100px;margin-left: auto; margin-right: auto; text-align:left;background-color:white;border:1px solid red">
 
footer
</div><!-- END FOOTER CONTENT -->
 
</div> <!-- END FOOTER WRAPPER -->
 
 
</body>
</html>

                                  
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Asked On
2009-08-07 at 03:30:12ID24634279
Topics

JavaScript

,

Cascading Style Sheets (CSS)

,

Dynamic HTML (DHTML)

Participating Experts
1
Points
500
Comments
3

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Answers

 

by: strickddPosted on 2009-08-07 at 07:09:40ID: 25042803

Check the following to get the height of the window.

window.innerHeight

Then set the div elements .height property

 

by: jmoriartyPosted on 2009-08-07 at 13:51:30ID: 25046838

exactly what I was looking for.

Thanks a bunch.

 

by: jmoriartyPosted on 2009-08-07 at 13:59:44ID: 25046909

Side note for those that may read this thread, see attached code snippet for solution example. Note: only tested in FF3/IE8, but should work fine in other browsers as well.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
 
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
<title>Untitled 2</title>
<script type="text/javascript">
function adjustFooterSize() {
  var CurrentWidth = 0, CurrentHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    CurrentWidth = window.innerWidth;
    CurrentHeight = window.innerHeight;
  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    //IE 6+ in 'standards compliant mode'
    CurrentWidth = document.documentElement.clientWidth;
    CurrentHeight = document.documentElement.clientHeight;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    CurrentWidth = document.body.clientWidth;
    CurrentHeight = document.body.clientHeight;
  }
  //subtract height of other elements on page; in my case, header = 150px, body = 300px for a total of 450.
  //window.alert(CurrentHeight);
  CurrentHeight = CurrentHeight - 450;
  //window.alert(CurrentHeight);
  //set height property of document footer to fill the remainder of the browser window
  document.getElementById('footer').style.height=CurrentHeight+'px';
}
</script>
 
</head>
<!-- call your resize function when the body element first loads, as well as when the window is resized. -->
<body onload="adjustFooterSize();" onresize="adjustFooterSize();" style="background-color:black">
 
<div id="header" style="height:150px;background-color:white"></div>
 
<div id="main" style="height:300px;background-color:black;color:red;">
</div>
 
<div id="footer" style="height:150px; min-height:150px;background-color:white"></div>
</body>
 
</html>
                                              
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