68 | * elements, and we will render a separate hangout control into each one. These
69 | * may be configured separately, except that the 'lang' and 'parsetags' options,
70 | * which apply globally, are only honored on the first
71 | *
found in the page.
72 | */
73 |
74 | // Default type. See choices at
75 | // https://developers.google.com/+/hangouts/button#hangout_button_parameters
76 | // All modes are supported if render is 'createhangout', but only normal is
77 | // supported if render is 'hangout'. This is not enforced by the API and invalid
78 | // values are silently ignored.
79 | var DEFAULT_HANGOUT_TYPE = 'normal';
80 | // Default widget language code.
81 | var DEFAULT_LANG = 'en';
82 | // Default value for window.___gcfg.parsetags. explicit because we call render
83 | // ourselves and want to avoid time wasted by DOM traversal.
84 | var DEFAULT_PARSETAGS = 'explicit';
85 | // Default publisher_id. We use the id for the Instant Hangouts Plus Page at
86 | // https://plus.google.com/b/112744459749475398119. Users may specify their own
87 | // id if they like, but this is not practically necessary since room uniqueness
88 | // is enforced by having the room_id contain the containing page's URL.
89 | var DEFAULT_PUBLISHER_ID = '112744459749475398119';
90 | // Default render mode. Requires publisher_id, room_id, and topic. Choices are
91 | // 'hangout' for widget that supports rooms and 'createhangout' for plain
92 | // button with no room support.
93 | var DEFAULT_RENDER = 'hangout';
94 | // Default topic, displayed in the Hangout and in the widget (but not button).
95 | var DEFAULT_TOPIC = 'Instant Hangout';
96 | // Default width in pixels if render is 'createhangout'. Ignored if render is
97 | // 'hangout.'
98 | var DEFAULT_WIDGET_SIZE = '136';
99 | // Default width in pixels if render is 'hangout'.
100 | var DEFAULT_WIDTH = '300';
101 | // URL of the script that provides gapi.hangout.
102 | var GAPI_URL = 'https://apis.google.com/js/plusone.js';
103 | // Class of the DOM element that both configures and receives the Hangouts
104 | // render.
105 | var PARENT_CLASS_NAME = 'instanthangouts';
106 | // Valid values for render option to gapi.hangout.render.
107 | var RENDER_CHOICES = ['createhangout', 'hangout'];
108 |
109 | function addOnLoadHook(handler) {
110 | // Cross-browser shim.
111 | if (window.addEventListener) {
112 | window.addEventListener('load', handler, false);
113 | } else if (window.attachEvent) {
114 | window.attachEvent('onload', handler);
115 | }
116 | }
117 |
118 | function configureGlobals(attrs) {
119 | // When loading gapi asychronously, these two vars must be set through the
120 | // global config, not through the script tag. They are documented at
121 | // https://developers.google.com/+/hangouts/button#script_tag_parameters.
122 | // We set these globals unconditionally, so we will overwrite any values set
123 | // by the host page before our script is loaded.
124 | window.___gcfg = {
125 | // Widget language. Choices:
126 | // https://developers.google.com/+/web/api/supported-languages
127 | lang: attrs.lang,
128 | // Loading mechanism.
129 | parsetags: attrs.parsetags
130 | };
131 | }
132 |
133 | function filter(elements, predicateFn) {
134 | // Returns all elements that match a predicateFn that takes a single element
135 | // as its argument.
136 | var matches = [];
137 |
138 | for (var i = 0; i < elements.length; i++) {
139 | var element = elements[i];
140 |
141 | if (predicateFn(element)) {
142 | matches.push(element);
143 | }
144 | }
145 |
146 | return matches;
147 | }
148 |
149 | function getGapiScripts() {
150 | // The host page may have any number of