50 lines
1.4 KiB
JavaScript
50 lines
1.4 KiB
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Copyright (c) 2013-present, Facebook, Inc.
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* This source code is licensed under the BSD-style license found in the
|
||
|
|
* LICENSE file in the root directory of this source tree. An additional grant
|
||
|
|
* of patent rights can be found in the PATENTS file in the same directory.
|
||
|
|
*
|
||
|
|
* @typechecks
|
||
|
|
*/
|
||
|
|
|
||
|
|
var containsNode = require('./containsNode');
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Gets an element's bounding rect in pixels relative to the viewport.
|
||
|
|
*
|
||
|
|
* @param {DOMElement} elem
|
||
|
|
* @return {object}
|
||
|
|
*/
|
||
|
|
function getElementRect(elem) {
|
||
|
|
var docElem = elem.ownerDocument.documentElement;
|
||
|
|
|
||
|
|
// FF 2, Safari 3 and Opera 9.5- do not support getBoundingClientRect().
|
||
|
|
// IE9- will throw if the element is not in the document.
|
||
|
|
if (!('getBoundingClientRect' in elem) || !containsNode(docElem, elem)) {
|
||
|
|
return {
|
||
|
|
left: 0,
|
||
|
|
right: 0,
|
||
|
|
top: 0,
|
||
|
|
bottom: 0
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
// Subtracts clientTop/Left because IE8- added a 2px border to the
|
||
|
|
// <html> element (see http://fburl.com/1493213). IE 7 in
|
||
|
|
// Quicksmode does not report clientLeft/clientTop so there
|
||
|
|
// will be an unaccounted offset of 2px when in quirksmode
|
||
|
|
var rect = elem.getBoundingClientRect();
|
||
|
|
|
||
|
|
return {
|
||
|
|
left: Math.round(rect.left) - docElem.clientLeft,
|
||
|
|
right: Math.round(rect.right) - docElem.clientLeft,
|
||
|
|
top: Math.round(rect.top) - docElem.clientTop,
|
||
|
|
bottom: Math.round(rect.bottom) - docElem.clientTop
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = getElementRect;
|