/** * 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. * * @providesModule getElementRect * @typechecks */ const containsNode = require('./containsNode'); /** * Gets an element's bounding rect in pixels relative to the viewport. * * @param {DOMElement} elem * @return {object} */ function getElementRect(elem) { const 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 // 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 const 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;