73 lines
2.1 KiB
Plaintext
73 lines
2.1 KiB
Plaintext
/**
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* Copyright (c) 2013-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @providesModule EventListener
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* @typechecks
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*/
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var emptyFunction = require('./emptyFunction');
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/**
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* Upstream version of event listener. Does not take into account specific
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* nature of platform.
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*/
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var EventListener = {
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/**
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* Listen to DOM events during the bubble phase.
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*
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* @param {DOMEventTarget} target DOM element to register listener on.
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* @param {string} eventType Event type, e.g. 'click' or 'mouseover'.
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* @param {function} callback Callback function.
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* @return {object} Object with a `remove` method.
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*/
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listen: function (target, eventType, callback) {
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if (target.addEventListener) {
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target.addEventListener(eventType, callback, false);
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return {
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remove: function () {
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target.removeEventListener(eventType, callback, false);
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}
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};
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} else if (target.attachEvent) {
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target.attachEvent('on' + eventType, callback);
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return {
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remove: function () {
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target.detachEvent('on' + eventType, callback);
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}
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};
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}
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},
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/**
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* Listen to DOM events during the capture phase.
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*
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* @param {DOMEventTarget} target DOM element to register listener on.
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* @param {string} eventType Event type, e.g. 'click' or 'mouseover'.
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* @param {function} callback Callback function.
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* @return {object} Object with a `remove` method.
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*/
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capture: function (target, eventType, callback) {
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if (target.addEventListener) {
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target.addEventListener(eventType, callback, true);
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return {
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remove: function () {
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target.removeEventListener(eventType, callback, true);
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}
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};
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} else {
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if (__DEV__) {
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console.error('Attempted to listen to events during the capture phase on a ' + 'browser that does not support the capture phase. Your application ' + 'will not receive some events.');
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}
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return {
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remove: emptyFunction
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};
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}
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},
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registerDefault: function () {}
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};
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module.exports = EventListener; |