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Mashing up JavaScript @BastianHofmann

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Wtf?

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• JavaScript Apps • CORS and OAuth2 • Local Storage • OEmbed and Caja • WebSockets, ActivityStrea.ms and PubsubHubbub • What‘s next?

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http://speakerdeck.com/u/bastianhofmann

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Let‘s write a JS App

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https://github.com/bashofmann/statusnet_js_mashup_2nd

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CSS Bastian

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http://twitter.github.com/bootstrap

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History & Bookmarking

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www.example.com#Page

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www.example.com/Page

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http://sammyjs.org/

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API Access

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Same Origin Policy

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Cross-Origin Resource Sharing Backend api.twitter.com Client client.net AJAX Access-Control-Allow-Origin: * http://www.w3.org/TR/cors/

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var html="
    "; for (var i=0; i < viewers.length; i++) { html += "
  • " + viewers[i].displayName + "
    • "; } html += "
      "; document.getElementById("#div").innerHTML = html; Where is the error?

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Templates

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Mustache.JS https://github.com/janl/mustache.js }

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var app = Sammy('#main', function() { var feed = []; this.use(Mustache, 'ms'); this.get('/', function() { this.trigger('getFeed'); }); ... }); jQuery(function() { app.run(); });

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this.bind('getFeed', function() { var that = this; $.ajax({ url: 'http://..._timeline.json', success: function(response) { feed = response; that.trigger('renderFeed'); } }); }); this.bind('renderFeed', function() { this.feed = feed; this.partial('js/templates/feed.ms'); });

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    {{#feed}}

  • {{{statusnet_html}}}

    {{created_at}} {{#user}} {{name}} {{/user}}

    • {{/feed}}

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Authorization

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http://oauth.net/

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User-Agent Profile

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http://twitter.com/authorize?&clientId=... Open Popup lanyrd.com

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http://twitter.com/authorize?&clientId=... Open Popup lanyrd.com HTTPS GET twitter.co m/ authorize

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http://twitter.com/authorize?&clientId=... Open Popup lanyrd.com Login twitter.co m/ authorize

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http://twitter.com/authorize?&clientId=... Open Popup lanyrd.com Grant Permission twitter.co m/ authorize

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lanyrd.com HTTPS Redirect RedirectURI# accessToken twitter.co m/ authorize RedirectURI# accessToken lanyrd.com

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lanyrd.com RedirectURI# accessToken Parse Access Token from Fragment Send it to opening window Close popup lanyrd.com

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Same Origin Policy

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lanyrd.com HTTPS Ajax Request to API Access Token twitter.com

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Storing the access token

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Local Storage http://www.w3.org/TR/webstorage/

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this.around(function(callback) { ... if (! oauth2.isLoggedIn()) { this.redirect('/Login'); return; } callback(); });

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this.get('/Login', function() { this.partial('login.ms'); });

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this.post('/Login', function() { var consumerKey = 'abc....'; window.open('http://status.net/api/oauth2/ authorize?response_toke=token&client_id=' + consumerKey); });

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var fragment = location.hash.substr(1); opener.parent.oauth2.storeToken(fragment); window.close();

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this.post('/Entry', function() { var that = this; $.ajax({ url: 'http://status.net/.../ update.json?oauth_token=' + oauth2.store['access_token'], type: 'POST', data: { 'status': that.params['status'] }, success: function() { that.redirect('/'); } }); });

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DEMO

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Mash it up!

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cool video: http://www.youtube.com/ watch?v=OFzkTxiwziQ

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OEmbed http://oembed.com/

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http://www.youtube.com/watch?v=OyJd2qsRkNk

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http://www.youtube.com/oembed?url=http%3A%2F %2Fwww.youtube.com%2Fwatch%3Fv %3DOyJd2qsRkNk&maxwidth=500&format=json

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{ "provider_url":"http:\/\/www.youtube.com\/", "title":"Jupiter Jones - Das Jahr in dem ich schlief (Musik Video)", "html":"\u003cobject width=\"500\" height=\"306\"\u003e \u003cparam name=\"movie\" value=\"http:\/\/www.youtube.com\/v\/ OyJd2qsRkNk?version=3\"\u003e\u003c\/param\u003e\u003cparam name= \"allowFullScreen\" value=\"true\"\u003e\u003c\/param\u003e \u003cparam name=\"allowscriptaccess\" value=\"always\"\u003e \u003c\/param\u003e\u003cembed src=\"http:\/\/www.youtube.com\/v\/ OyJd2qsRkNk?version=3\" type=\"application\/x-shockwave-flash \" width=\"500\" height=\"306\" allowscriptaccess=\"always \" allowfullscreen=\"true\"\u003e\u003c\/embed\u003e\u003c\/object \u003e", "author_name":"St182", "height":306, "thumbnail_width":480, "width":500, "version":"1.0", "author_url":"http:\/\/www.youtube.com\/user\/Stinkfist182", "provider_name":"YouTube", "thumbnail_url":"http:\/\/i4.ytimg.com\/vi\/OyJd2qsRkNk\/ hqdefault.jpg", "type":"video", "thumbnail_height":360 }

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cool video:

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http://embed.ly/

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this.bind('changed', function() { embeds = []; $('div.feed-item h3').embedly({ key:'...', maxWidth: 450, wmode: 'transparent', method: 'after' }); });

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Caja http://code.google.com/p/google-caja/

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html_sanitize(result.html);

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DEMO

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Instant updates without reloading

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PubSubHubbub retrieves Atom feed with Hub URL Hub posts sth pings every subscriber subscribes for feed acks subscription http://code.google.com/p/pubsubhubbub/

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http://activitystrea.ms/schema/1.0/ note http://status.net.xyz:8061/index.php/notice/20 hello from client hello from client http://activitystrea.ms/schema/1.0/post 2011-05-23T21:07:33+00:00 2011-05-23T21:07:33+00:00 52.52437 13.41053

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http://activitystrea.ms/

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PubSubHubbub retrieves Atom feed with Hub URL Hub posts sth pings every subscriber subscribes for feed acks subscription http://code.google.com/p/pubsubhubbub/

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http://nodejs.org/

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HTTP Server for PubsubHubbub

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WebSockets http://dev.w3.org/html5/websockets/

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socket.io http://socket.io/

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(Webkit) Browser Notifications

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retrieve Stream with Hub Ajax: request Subscription WebSockets: new Post subscribe at hub challenge ack new post Notification new post

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DEMO

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Meteor http://www.meteor.com

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https://github.com/bashofmann/meteor_shoutbox_demo

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DEMO

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Did you like this talk? http://bit.ly/oscon12_js_mashup h"p://twi"er.com/Bas2anHofmann h"p://profiles.google.com/bashofmann h"p://lanyrd.com/people/Bas2anHofmann h"p://speakerdeck.com/u/bas2anhofmann h"ps://github.com/bashofmann [email protected]