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05/06/2009 at 03:58PM PDT, ID: 24387070
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8.5

Detect screen resolution in javascript and dynamically change a .css file

Asked by joaochagas in JavaScript, Cascading Style Sheets (CSS)

Tags: detect, javascript, script, dynamic, css, style, file, screen, resolution

Hi E's, I have a page that contain a 'Drop-in content box', and that box appear every time the page is load, you can see in attach image.
I want put this box in the middle of the page, I try change the css in this line, but don't work:
CODE:<div id="dropin" style="position:absolute;visibility:hidden;left:200px;top:100px;width:500px;height:300px;
(I try change left and top to auto but the box open in position zero).

So, the only solution I see for this issue is take the measure of screen and give values to left and top dinamically.
Example, the box size is 200*200, screen resolution is 800*600, so, for open in the center: left 300px and top 200px.

How I do this in javascript?

Regards, JC 
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<!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>
<script language="JavaScript1.2">
 
// Drop-in content box- By Dynamic Drive
// For full source code and more DHTML scripts, visit http://www.dynamicdrive.com
// This credit MUST stay intact for use
 
var ie=document.all
var dom=document.getElementById
var ns4=document.layers
var calunits=document.layers? "" : "px"
 
var bouncelimit=32 //(must be divisible by 8)
var direction="up"
 
function initbox(){
if (!dom&&!ie&&!ns4)
return
crossobj=(dom)?document.getElementById("dropin").style : ie? document.all.dropin : document.dropin
scroll_top=(ie)? truebody().scrollTop : window.pageYOffset
crossobj.top=scroll_top-250+calunits
crossobj.visibility=(dom||ie)? "visible" : "show"
dropstart=setInterval("dropin()",50)
}
 
function dropin(){
scroll_top=(ie)? truebody().scrollTop : window.pageYOffset
if (parseInt(crossobj.top)<100+scroll_top)
crossobj.top=parseInt(crossobj.top)+40+calunits
else{
clearInterval(dropstart)
bouncestart=setInterval("bouncein()",50)
}
}
 
function bouncein(){
crossobj.top=parseInt(crossobj.top)-bouncelimit+calunits
if (bouncelimit<0)
bouncelimit+=8
bouncelimit=bouncelimit*-1
if (bouncelimit==0){
clearInterval(bouncestart)
}
}
 
function dismissbox(){
if (window.bouncestart) clearInterval(bouncestart)
crossobj.visibility="hidden"
}
 
function truebody(){
return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}
 
 
window.onload=initbox
 
</script>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
 
<body>
<div id="dropin" style="position:absolute;visibility:hidden;left:200px;top:100px;width:500px;height:300px;background-color:#F5F5F5">
 
<div align="right"><a href="#" onClick="dismissbox();return false">[Close Box] </a></div>
 
SPECIFY YOUR CONTENT HERE. IT COULD BE TEXT, IMAGES, OR RICH HTML
 
</div>
</body>
</html>
Attachments:
 
onload.gif (53 KB) (File Type Details) 
drop in content box
drop in content box
 
 
Keywords: Detect screen resolution in javascript a…
Title
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[+][-]05/07/09 02:45 PM, ID: 24330992

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About this solution

Zones: JavaScript, Cascading Style Sheets (CSS)
Tags: detect, javascript, script, dynamic, css, style, file, screen, resolution
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Solution Provided By: bugada
Participating Experts: 1
Solution Grade: A
 
 
[+][-]05/06/09 04:32 PM, ID: 24320979

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[+][-]05/07/09 01:30 PM, ID: 24330273

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20091028-EE-VQP-86 - Hierarchy / EE_QW_3_20080625