Google Gadget to embed YouTube videos.

youtube-iframe.xml

<?xml version="1.0" encoding="UTF-8"?>
<Module>
<ModulePrefs title="YouTube iframe embed" author="Stefan Sundin" width="640" height="390"></ModulePrefs>
<UserPref name="id" datatype="string" default_value="" />
<UserPref name="width" datatype="string" default_value="" />
<UserPref name="height" datatype="string" default_value="" />
<UserPref name="args" datatype="string" default_value="" />
<Content type="html">
<![CDATA[
<script type="text/javascript">

var prefs = new gadgets.Prefs();
var width = prefs.getString("width");
var height = prefs.getString("height");
var args = prefs.getString("args");
var video_id = prefs.getString("id");

//IE
if (!window.innerWidth && document.body.offsetWidth) {
	window.innerWidth = document.body.offsetWidth;
	window.innerHeight = document.body.offsetHeight;
}

if (width == "") {
	if (window.innerWidth) {
		width = window.innerWidth;
		height = window.innerHeight;
	}
	else {
		width = 640;
		height = 390;
	}
}

var iframe = document.createElement("iframe");
iframe.setAttribute("class", "youtube-player");
iframe.setAttribute("type", "text/html");
iframe.setAttribute("seamless", "seamless");
iframe.setAttribute("frameborder", 0);
iframe.setAttribute("width", width);
iframe.setAttribute("height", height);
iframe.setAttribute("src", "https://www.youtube.com/embed/"+video_id+(args?"?"+args:""));
document.body.appendChild(iframe);



/* Developer notes:
https://gist.github.com/stefansundin/8194147

Example use (Google Project Hosting):
<wiki:gadget border="0" url="https://gist.githubusercontent.com/stefansundin/8194147/raw/youtube-iframe.xml" up_id="LLtxSkoWKfc" width="640" height="390" />
<wiki:gadget border="0" url="https://gist.githubusercontent.com/stefansundin/8194147/raw/youtube-iframe.xml" up_id="LLtxSkoWKfc" width="1280" height="750" up_args="start=8" />
<wiki:gadget border="0" url="https://gist.githubusercontent.com/stefansundin/8194147/raw/youtube-iframe.xml" up_id="LLtxSkoWKfc" width="1280" height="750" up_args="start=8&rel=0" />

width/height combinations and resulting default quality:
560x345   (320p)
640x390   (320p)
853x510   (480p)
1280x750  (720p)
1920x1110 (1080p)
You can also use parameters up_width=1280 up_height=750 to override detection code.

You can specify the parameter "args" if you want to give the player additional arguments.
List of available arguments here: https://developers.google.com/youtube/player_parameters
One useful argument is "start" which specifies where in the video to start playing.
Separate arguments with "&".
*/

</script>
]]>
</Content>
</Module>