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7.7 Reading a Frame's Dimensions
NN 6, IE 4(Win)/5(Mac)
7.7.1 Problem
You want to know the
precise pixel dimensions of a frame after the frameset is rendered.
7.7.2 Solution
Because it is not uncommon to specify a percentage or
* wildcard character for one or more frame size
specifications, the actual rendered size is unknown until the browser
completes all of its calculations for rendering. A script running in
one of the frames can access the interior dimensions of any sibling
frame (and its own frame) with the following
function:
function getFrameSize(frameID) {
var result = {height:0, width:0};
if (document.getElementById) {
var frame = parent.document.getElementById(frameID);
if (frame.scrollWidth) {
result.height = frame.scrollHeight;
result.width = frame.scrollWidth;
}
}
return result;
}The function returns an object with height and
width properties containing the rendered pixel
measures of the frame whose ID is passed as a parameter. You get
accurate readings in IE 4 or later for Windows and Netscape 7 or
later. IE for Macintosh through Version 5.x
provides accurate readings when the frame in question does not have
scrollbars. When
scrollbars are present, the
returned sizes are reduced by the thickness of the scrollbars.
Unfortunately, no property reveals whether a scrollbar is visible in
the frame if the frame's scroll
attribute defaults to the auto setting.
7.7.3 Discussion
The keys to making the function work include referencing the
parent (or top) of the
individual frames and the actual frame element as
opposed to the frame-as-window object. Thus, the more common
parent.frameName or
parent.frames["frameName"]
types of reference will not suffice. By referencing the
frame element directly, you get the browser to
report the rendered size of the element, irrespective of the content
of the frame.
You can also install this function inside the frameset
document's script. But you must then remove the
reference to the parent in the fourth line of the function. Because
the script already operates in the parent, its own element collection
includes the frame elements. You can install this
function in the frameset, yet still invoke it from one of the frames,
as in:
var frameSize = parent.getFrameSize("myFrame4");The parent window is part of the equation in one
form or another.
7.7.4 See Also
Recipe 7.8 for resizing a frame under script control.
