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