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Scarygami/cast_loader.js

Last active August 29, 2015 13:56
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Loads and prepares the Google Cast Chrome SDK. Just include the cast_loader.js then call cast_loader.onReady(function (result) { .... }), see included sample to see what the result codes mean.
Raw
cast_loader.js
/*
* Copyright (c) 2014 Gerwin Sturm, FoldedSoft e.U. / www.foldedsoft.at
*
* 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.
*/
(function (global) {
var doc = global.document, callbacks = [], loading = true, script;
global.cast_loader = {
READY: "ready",
WRONG_BROWSER: "wrong browser",
EXTENSION_MISSING: "extension missing",
SDK_NOT_FOUND: "sdk not found"
};
function safe_callback(cb, result) {
if (!!cb && typeof cb === "function") {
global.setTimeout(function () {
try { cb(result); } catch (e) {}
}, 0);
}
}
function finish(state) {
var cb;
loading = false;
global.cast_loader.state = state;
while (callbacks.length > 0) {
cb = callbacks.shift();
safe_callback(cb, state);
}
}
global.cast_loader.onReady = function (cb) {
if (loading) {
callbacks.push(cb);
} else {
safe_callback(cb, global.cast_loader.state);
}
};
if (!global.chrome) {
finish(global.cast_loader.WRONG_BROWSER);
return;
}
script = doc.createElement("script");
script.type = "text/javascript";
script.onload = function () {
function waitForApi() {
if (!global.chrome.cast.isAvailable) {
global.setTimeout(waitForApi, 100);
} else {
finish(global.cast_loader.READY);
}
}
if (!global.chrome.cast) {
finish(global.cast_loader.SDK_NOT_FOUND);
return;
}
if (global.chrome.cast.extensionId) {
waitForApi();
} else {
global.chrome.cast.ApiBootstrap_.findInstalledExtension_(function (extensionId) {
if (!extensionId) {
finish(global.cast_loader.EXTENSION_MISSING);
} else {
waitForApi();
}
});
}
};
script.onerror = function (e) {
finish(global.cast_loader.SDK_NOT_FOUND);
};
script.src = "https://www.gstatic.com/cv/js/sender/v1/cast_sender.js";
doc.getElementsByTagName("head")[0].appendChild(script);
}(this));
Raw
cast_loader_sample.html
<!DOCTYPE html>
<html>
<head>
<title>Google Cast Loader Sample</title>
<script src="cast_loader.js"></script>
</head>
<body>
<div id="debug"></debug>
<script type="text/javascript">
var debug = document.getElementById("debug");
cast_loader.onReady(function (result) {
switch (result) {
case cast_loader.READY:
debug.innerHTML = "Ready to cast, chrome.cast methods/objects can be used";
break;
case cast_loader.WRONG_BROWSER:
debug.innerHTML = "Browser not supported, use Chrome...";
break;
case cast_loader.EXTENSION_MISSING:
debug.innerHTML = "Google Cast extension missing";
break;
case cast_loader.SDK_NOT_FOUND:
debug.innerHTML = "Cast SDK not found, i.e. something went really wrong...";
break;
}
});
</script>
</body>
</html>
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