/** * Geometry.js: portable functions for querying window and document geometry * * This module defines functions for querying window and document geometry. * * getWindowX/Y(): return the position of the window on the screen * getViewportWidth/Height(): return the size of the browser viewport area * getDocumentWidth/Height(): return the size of the document. * getHorizontalScroll(): return the position of the horizontal scrollbar * getVerticalScroll(): return the position of the vertical scrollbar * * Note that there is no portable way to query the overall size of the * browser window, so there are no getWindowWidth/Height() functions. * * IMPORTANT: This module must be included in the of a document * instead of the of the document. * * This code is from the book JavaScript: The Definitive Guide, 5th Edition, * by David Flanagan. Copyright 2006 O'Reilly Media, Inc. (ISBN #0596101996) * */ var Geometry = {}; if (window.screenLeft !== undefined) { // IE and others Geometry.getWindowX = function() { return window.screenLeft; }; Geometry.getWindowY = function() { return window.screenTop; }; } else { // Firefox and others Geometry.getWindowX = function() { return window.screenX; }; Geometry.getWindowY = function() { return window.screenY; }; } if (window.innerWidth !== undefined) { // All browsers but IE Geometry.getViewportWidth = function() { return window.innerWidth; }; Geometry.getViewportHeight = function() { return window.innerHeight; }; Geometry.getHorizontalScroll = function() { return window.pageXOffset; }; Geometry.getVerticalScroll = function() { return window.pageYOffset; }; } else if (document.documentElement && document.documentElement.clientWidth) { // These functions are for IE6 when there is a DOCTYPE Geometry.getViewportWidth = function() { return document.documentElement.clientWidth; }; Geometry.getViewportHeight = function() { return document.documentElement.clientHeight; }; Geometry.getHorizontalScroll = function() { return document.documentElement.scrollLeft; }; Geometry.getVerticalScroll = function() { return document.documentElement.scrollTop; }; } else if (document.body.clientWidth) { // These are for IE4, IE5, and IE6 without a DOCTYPE Geometry.getViewportWidth = function() { return document.body.clientWidth; }; Geometry.getViewportHeight = function() { return document.body.clientHeight; }; Geometry.getHorizontalScroll = function() { return document.body.scrollLeft; }; Geometry.getVerticalScroll = function() { return document.body.scrollTop; }; } // These functions return the size of the document. They are not window // related, but they are useful to have here anyway. if (document.documentElement && document.documentElement.scrollWidth) { Geometry.getDocumentWidth = function() { return document.documentElement.scrollWidth; }; Geometry.getDocumentHeight = function() { return document.documentElement.scrollHeight; }; } else if (document.body.scrollWidth) { Geometry.getDocumentWidth = function() { return document.body.scrollWidth; }; Geometry.getDocumentHeight = function() { return document.body.scrollHeight; }; } // This function returns the current X position (relative to the viewport) of an element function getX(e) { var x = 0; while (e) { x += e.offsetLeft; e = e.offsetParent; } return x; } //This function returns the current Y position (relative to the viewport) of an element function getY(e) { var y = 0; while (e) { y += e.offsetTop; e = e.offsetParent; } return y; }