72 lines
2.7 KiB
JavaScript
72 lines
2.7 KiB
JavaScript
/* Copyright 2012 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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var FirefoxCom = (function FirefoxComClosure() {
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'use strict';
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return {
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/**
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* Creates an event that the extension is listening for and will
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* synchronously respond to.
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* NOTE: It is reccomended to use request() instead since one day we may not
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* be able to synchronously reply.
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* @param {String} action The action to trigger.
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* @param {String} data Optional data to send.
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* @return {*} The response.
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*/
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requestSync: function(action, data) {
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var request = document.createTextNode('');
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document.documentElement.appendChild(request);
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var sender = document.createEvent('CustomEvent');
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sender.initCustomEvent('pdf.js.message', true, false,
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{action: action, data: data, sync: true});
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request.dispatchEvent(sender);
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var response = sender.detail.response;
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document.documentElement.removeChild(request);
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return response;
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},
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/**
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* Creates an event that the extension is listening for and will
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* asynchronously respond by calling the callback.
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* @param {String} action The action to trigger.
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* @param {String} data Optional data to send.
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* @param {Function} callback Optional response callback that will be called
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* with one data argument.
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*/
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request: function(action, data, callback) {
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var request = document.createTextNode('');
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if (callback) {
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document.addEventListener('pdf.js.response', function listener(event) {
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var node = event.target,
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response = event.detail.response;
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document.documentElement.removeChild(node);
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document.removeEventListener('pdf.js.response', listener, false);
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return callback(response);
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}, false);
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}
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document.documentElement.appendChild(request);
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var sender = document.createEvent('CustomEvent');
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sender.initCustomEvent('pdf.js.message', true, false,
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{action: action, data: data, sync: false,
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callback: callback});
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return request.dispatchEvent(sender);
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}
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};
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})();
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