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| 1 /* |
| 2 Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 3 Use of this source code is governed by a BSD-style license that can be |
| 4 found in the LICENSE file. |
| 5 */ |
| 6 |
| 7 /** |
| 8 * @fileoverview Collection of functions which operate on DOM. |
| 9 */ |
| 10 |
| 11 var domUtils = window['domUtils'] || {}; |
| 12 |
| 13 /** |
| 14 * Returns pageX and pageY of the given element. |
| 15 * |
| 16 * @param {Element} element An element of which the top-left position is to be |
| 17 * returned in the coordinate system of the document page. |
| 18 * @return {Object} A point object which has {@code x} and {@code y} fields. |
| 19 */ |
| 20 domUtils.pageXY = function(element) { |
| 21 var x = 0, y = 0; |
| 22 for (; element; element = element.offsetParent) { |
| 23 x += element.offsetLeft; |
| 24 y += element.offsetTop; |
| 25 } |
| 26 return {'x': x, 'y': y}; |
| 27 }; |
| 28 |
| 29 /** |
| 30 * Returns pageX and pageY of the given event. |
| 31 * |
| 32 * @param {Event} event An event of which the position is to be returned in |
| 33 * the coordinate system of the document page. |
| 34 * @return {Object} A point object which has {@code x} and {@code y} fields. |
| 35 */ |
| 36 domUtils.pageXYOfEvent = function(event) { |
| 37 return (event.pageX != null && event.pageY != null) ? |
| 38 {'x': event.pageX, 'y': event.pageY} : |
| 39 {'x': event.clientX + document.body.scrollLeft + |
| 40 document.documentElement.scrollLeft, |
| 41 'y': event.clientY + document.body.scrollTop + |
| 42 document.documentElement.scrollTop}; |
| 43 }; |
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