Difference between revisions of "Shared Media and data URIs"

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== About ==
 
'''[http://en.wikipedia.org/wiki/Data_Uri Data: URIs] can be used with [[Shared Media]].''' If you're not a geek, why should you care?
 
In short, one possible use is: say you have some content you want to show on a prim face, but you don't want to go through the trouble of creating an HTML file and uploading it to a webserver. (Or, you don't have a server.)
 
'''You can use a data: URI tool to convert web content into a long link you can paste into Shared Media.''' It saves time and trouble.
 
Here's a simple example:
 
# In your web browser, go to '''[http://software.hixie.ch/utilities/cgi/data/data The data: URI kitchen]'''. This is an easy tool to convert HTML into a data: URI.
# Insert your HTML between the <code><nowiki><body></nowiki></code> tags. Change <code><nowiki><p></p></nowiki></code> to <code><nowiki><p>This is a test!</p></nowiki></code>
# Click the '''Generate''' button.
# Copy the ''full'' data: URI in your web browser's address bar. It should look like this: <code><nowiki>data:text/html;charset=utf-8,<!DOCTYPE HTML PUBLIC "-%2F%2FW3C%2F%2FDTD HTML 4.0%2F%2FEN">%0D%0A<html lang%3D"en">%0D%0A <head>%0D%0A  <title>Test<%2Ftitle>%0D%0A  <style type%3D"text%2Fcss">%0D%0A  <%2Fstyle>%0D%0A <%2Fhead>%0D%0A <body>%0D%0A  <p>This is a test!<%2Fp>%0D%0A <%2Fbody>%0D%0A<%2Fhtml>%0D%0A</nowiki></code>
# Using the steps described in "'''[[Adding Shared Media to an object]]'''", paste that exact URI into Shared Media on a prim.
# The result should look like this:
 
[[File:Data_URI_with_Shared_Media.png|640px]]
 
Feel free to use more advanced code to gain familiarity.
 
{{KBtip|A data: URI can be up to 32 kilobytes. The maximum length of an URI/URL in the Viewer is 1024 characters, although an URL-shortening service (as described below) can prevent this limit from being reached.}}
 
== Examples ==
 
This shows several lines of styled text:
 
: <code><nowiki>data:text/html;charset=utf-8,<!DOCTYPE HTML PUBLIC "-%2F%2FW3C%2F%2FDTD HTML 4.0%2F%2FEN">%0D%0A<html lang%3D"en">%0D%0A <head>%0D%0A  <title>Test<%2Ftitle>%0D%0A  <style type%3D"text%2Fcss">%0D%0A  <%2Fstyle>%0D%0A <%2Fhead>%0D%0A <body>%0D%0A  <p>This is a test!<%2Fp>%0D%0A%0D%0A<p><strong>But it gets fancier because we're using styled text.<%2Fstrong><%2Fp>%0D%0A%0D%0A<p><em>Feel free to play with HTML snippets and jazz it up.<%2Fem><%2Fp>%0D%0A%0D%0A<h2><font color%3D"%23ff0080"><strong>That's why we call it rich content%2C yeah%3F<%2Fstrong><%2Ffont><%2Fh2>%0D%0A%0D%0A<p><strike>This line has intentionally been struck out.<%2Fstrike><%2Fp>%0D%0A <%2Fbody>%0D%0A<%2Fhtml>%0D%0A</nowiki></code>
 
This embeds a Flash video:
 
: <code><nowiki>data:text/html;charset=utf-8,<!DOCTYPE HTML PUBLIC "-%2F%2FW3C%2F%2FDTD HTML 4.0%2F%2FEN">%0D%0A<html lang%3D"en">%0D%0A <head>%0D%0A  <title>Test<%2Ftitle>%0D%0A  <style type%3D"text%2Fcss">%0D%0A  <%2Fstyle>%0D%0A <%2Fhead>%0D%0A <body>%0D%0A  <p><object width%3D"640" height%3D"480"><param name%3D"allowfullscreen" value%3D"true" %2F><param name%3D"allowscriptaccess" value%3D"always" %2F><param name%3D"movie" value%3D"http%3A%2F%2Fvimeo.com%2Fmoogaloop.swf%3Fclip_id%3D9656041%26amp%3Bserver%3Dvimeo.com%26amp%3Bshow_title%3D0%26amp%3Bshow_byline%3D0%26amp%3Bshow_portrait%3D0%26amp%3Bcolor%3DFF0080%26amp%3Bfullscreen%3D1" %2F><embed src%3D"http%3A%2F%2Fvimeo.com%2Fmoogaloop.swf%3Fclip_id%3D9656041%26amp%3Bserver%3Dvimeo.com%26amp%3Bshow_title%3D0%26amp%3Bshow_byline%3D0%26amp%3Bshow_portrait%3D0%26amp%3Bcolor%3DFF0080%26amp%3Bfullscreen%3D1" type%3D"application%2Fx-shockwave-flash" allowfullscreen%3D"true" allowscriptaccess%3D"always" width%3D"640" height%3D"480"><%2Fembed><%2Fobject><%2Fp>%0D%0A <%2Fbody>%0D%0A<%2Fhtml>%0D%0A</nowiki></code>
 
This embeds an SVG (scalable vector graphic) of three interlocking, colored circles. Since SVGs are vectors, they can scale smoothly to any size:
 
: <code><nowiki>http://tinyurl.com/yd5uyfa</nowiki></code>
 
This embeds a Flash panorama of a Second Life scene, [https://blogs.secondlife.com/community/community/tnt/blog/2010/03/17/viewer-2-tip-shared-media-add-custom-content-with-data-uri-no-webpage-upload-needed as explained here]:
 
: <code><nowiki>data:text/html;charset=utf-8,<html lang%3D"en">%0D%0A <head>%0D%0A  <title>Test<%2Ftitle>%0D%0A  <style type%3D"text%2Fcss">%0D%0A  <%2Fstyle>%0D%0A <%2Fhead>%0D%0A <body marginheight%3D"0" marginwidth%3D"0" topmargin%3D"0" leftmargin%3D"0" rightmargin%3D"0" bottommargin%3D"0" style%3D"overflow%3Ahidden">%0D%0A  <p align%3D"center"><object width%3D"100%25" height%3D"100%25">%0D%0A<param name%3D"movie" value%3D"http%3A%2F%2Ftorley.s3.amazonaws.com%2Fpanoramas%2FAmbiant-Waters-S.swf">%0D%0A<embed src%3D"http%3A%2F%2Ftorley.s3.amazonaws.com%2Fpanoramas%2FAmbiant-Waters-S.swf" width%3D"100%25" height%3D"100%25" type%3D"application%2Fx-shockwave-flash">%0D%0A<%2Fembed>%0D%0A<%2Fobject><%2Fp>%0D%0A <%2Fbody>%0D%0A<%2Fhtml></nowiki></code>
 
== Those data: URIs are so long! Can I shorten them? ==
 
Yes, an URL-shortener can make them a lot easier to copy-and-paste, although most popular ones (like bit.ly and snurl.com — no relation to [[SLurl]]) have troubles, and reliability is dependent on the specific service. '''[http://tinyurl.com TinyURL]''' appears to work, as shown above.
 
== Can I embed other data types too? ==
 
Yes, like images. The '''[http://websemantics.co.uk/online_tools/image_to_data_uri_convertor/ Image to data URI convertor]''' can convert small PNG, JPG, or GIF images into a data URI. The resulting code may appear quite lengthy but give it a try.
 
As shown above, SVGs can work, too.
 
== Can I make pure JavaScript work in a data: URI? ==
 
Possibly. This needs to be tested more, so please feel free to report your findings here.
 
== What's the difference between a URI and a URL? ==
 
This gets fairly technical, but "[http://www.damnhandy.com/2009/08/26/url-vs-uri-vs-urn-in-more-concise-terms/ URL vs. URI vs. URN, in More Concise Terms]" has a good explanation.
 
== See also ==
 
* '''[[User:Kelly_Linden/lsl_hacks|Shared Media and HTTP-In]]''' - Kelly Linden compiled these clever tech tricks on making Shared Media integrate SL and the web better, including data: URIs.
* '''[https://blogs.secondlife.com/community/community/tnt/blog/2010/03/17/viewer-2-tip-shared-media-add-custom-content-with-data-uri-no-webpage-upload-needed <nowiki>[VIEWER 2 TIP]</nowiki> Shared Media: Add custom content with data: URI (no webpage upload needed!)]''' - Blog post referring to this article.
 
[[Category:Shared Media]]

Revision as of 09:39, 28 November 2011

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