The page below creates a popup message on the screen. It printed the
popup box 30 pixels from the left:
document.getElementById("dwindow").style.left="30p x"
How do I modify it so that the popup box is always centered on the
screen regardless of the monitor resolution of the users?
I do not know JS and I have been testing without success. Anybody can
help? Thanks.
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<html>
<head>
<script>
var dragapproved=false
var minrestore=0
var initialwidth,initialheight
var ie5=document.all&&document.getElementById
var ns6=document.getElementById&&!document.all
function iecompattest(){
return (!window.opera && document.compatMode &&
document.compatMode!="BackCompat")? document.documentElement : document.body
}
function drag_drop(e){
if (ie5&&dragapproved&&event.button==1){
document.getElementById("dwindow").style.left=temp x+event.clientX-offsetx+"px"
document.getElementById("dwindow").style.top=tempy +event.clientY-offsety+"px"
}
else if (ns6&&dragapproved){
document.getElementById("dwindow").style.left=temp x+e.clientX-offsetx+"px"
document.getElementById("dwindow").style.top=tempy +e.clientY-offsety+"px"
}
}
function initializedrag(e){
offsetx=ie5? event.clientX : e.clientX
offsety=ie5? event.clientY : e.clientY
document.getElementById("dwindowcontent").style.di splay="none" //extra
tempx=parseInt(document.getElementById("dwindow"). style.left)
tempy=parseInt(document.getElementById("dwindow"). style.top)
dragapproved=true
document.getElementById("dwindow").onmousemove=dra g_drop
}
function loadwindow(url,width,height){
if (!ie5&&!ns6)
window.open(url,"","width=width,height=height,scro llbars=1")
else{
document.getElementById("dwindow").style.display=' '
document.getElementById("dwindow").style.width=ini tialwidth=width+"px"
document.getElementById("dwindow").style.height=in itialheight=height+"px"
document.getElementById("dwindow").style.left="30p x"
document.getElementById("dwindow").style.top=ns6?
window.pageYOffset*1+30+"px" : iecompattest().scrollTop*1+30+"px"
document.getElementById("cframe").src=url
}
}
function maximize(){
if (minrestore==0){
minrestore=1 //maximize window
document.getElementById("maxname").setAttribute("s rc","restore.gif")
document.getElementById("dwindow").style.width=ns6 ?
window.innerWidth-20+"px" : iecompattest().clientWidth+"px"
document.getElementById("dwindow").style.height=ns 6?
window.innerHeight-20+"px" : iecompattest().clientHeight+"px"
}
else{
minrestore=0 //restore window
document.getElementById("maxname").setAttribute("s rc","max.gif")
document.getElementById("dwindow").style.width=ini tialwidth
document.getElementById("dwindow").style.height=in itialheight
}
document.getElementById("dwindow").style.left=ns6?
window.pageXOffset+"px" : iecompattest().scrollLeft+"px"
document.getElementById("dwindow").style.top=ns6?
window.pageYOffset+"px" : iecompattest().scrollTop+"px"
}
function closeit(){
document.getElementById("dwindow").style.display=" none"
}
function stopdrag(){
dragapproved=false;
document.getElementById("dwindow").onmousemove=nul l;
document.getElementById("dwindowcontent").style.di splay="" //extra
}
</script>
</head>
<body>
<div id="dwindow"
style="position:absolute;cursor:hand;left:0px;top: 0px;display:none"
onMousedown="initializedrag(event)" onMouseup="stopdrag()"
onSelectStart="return false">
<div align="right" style="background-color:gray"><img src="max.gif"
id="maxname" onClick="maximize()"><img src="close.gif"
onClick="closeit()"></div>
<div id="dwindowcontent" style="height:100%">
<table width="100%" cellpadding="5" cellspacing="5"
style="border-collapse: collapse; border: 1px solid #000000"
bordercolor="#111111" id="AutoNumber1">
<tr>
<td>This is the popup message. This is the popup message.</td>
</tr>
</table>
</div>
</div>
<script>
//Use below code to load DHTML Window as page loads
if (ns6) window.onload=new Function('loadwindow("",350,150)')
else
loadwindow("",350,250)
</script>
</body>
</html>