getViewport

[Dean A. Hoover]

I just wrote the following code to get the "viewport"
in the browser. Its the x, y, width, and height in
the scroll view. I only have IE 6 and Opera 7 on
windows 2000, and Mozilla 1.72 on linux. On those
platforms the code appears to work. Any suggestions
on how to ensure that it works on other platforms?

Dean Hoover

function getViewport()
{
var viewport = {x:0,y:0,width:0,height:0};

if (typeof window.scrollX != 'undefined')
{
viewport.x = window.pageXOffset;
viewport.y = window.pageYOffset;
viewport.width = window.innerWidth;
viewport.height = window.innerHeight;
return viewport;
}
else
{
if (document.documentElement &&
(typeof document.documentElement.scrollLeft != 'undefined') &&
(document.documentElement.scrollLeft != 0))
{
viewport.x = document.documentElement.scrollLeft;
viewport.y = document.documentElement.scrollTop;
viewport.width = document.documentElement.clientWidth;
viewport.height = document.documentElement.clientHeight;
return viewport;
}
else
{
if (document.body &&
(typeof document.body.scrollLeft != 'undefined'))
{
viewport.x = document.body.scrollLeft;
viewport.y = document.body.scrollTop;

if (document.compatMode == "CSS1Compat")
{
viewport.width = document.body.parentNode.clientWidth;
viewport.height = document.body.parentNode.clientHeight;
}
else
{
viewport.width = document.body.clientWidth;
viewport.height = document.body.clientHeight;
}

return viewport;
}
}
}

return null;
}