Created
May 18, 2013 14:51
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Example of using pubsub for communication between Polymer.js widgets. The purpose of this is not to demonstrate pubsub, but to show how to easily blend 'normal' javascript with Polymer components.
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Polymer</title> | |
| <meta charset="utf-8" /> | |
| <script type="text/javascript" charset="utf-8" src="pubsub.js"> </script> | |
| <script type="text/javascript" charset="utf-8" src="polymer/polymer.js"> </script> | |
| <link rel="import" href="publisher.html"> | |
| <link rel="import" href="subscriber.html"> | |
| </head> | |
| <body> | |
| <publisher></publisher> | |
| <subscriber></subscriber> | |
| </body> | |
| </html> |
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| <element name="publisher"> | |
| <template> | |
| <div >Yo i'm the publisher: The value is <strong>{{value}}</strong>.<br> | |
| <h2>that's {{level}}.</h2> | |
| Lower or raise it here:<br> | |
| <input id="valueInput" type="range" value="{{value}}"> | |
| </div> | |
| </template> | |
| <script> | |
| Polymer.register(this, { | |
| value: "50", | |
| level: "medium", | |
| valueChanged: function() { | |
| if(this.value > 95) { | |
| this.level = "god damn high" | |
| } else if(this.value > 80) { | |
| this.level = "high" | |
| } else if(this.value > 50) { | |
| this.level = "medium" | |
| } else { | |
| this.level = "low" | |
| } | |
| pubsub.publish("value:changed", this.value); | |
| } | |
| }); | |
| </script> | |
| </element> |
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| /* | |
| just a shim for some pubsub thing. Ignore and use something else :) | |
| */ | |
| window.pubsub = (function() { | |
| var callbacks = []; | |
| function publish() { | |
| var event = arguments[0], | |
| args = [].slice.call(arguments, 1), | |
| re = new RegExp("^" + event + "$"); | |
| console.log(event); | |
| callbacks.forEach(function(call) { | |
| if(re.test(call.key)) { | |
| call.handler.apply(call.context, args); | |
| } else { | |
| console.log("didn't"); | |
| } | |
| }); | |
| } | |
| function subscribe(key, handler, context) { | |
| context = context || {}; | |
| callbacks.push({ | |
| key: key, | |
| handler: handler, | |
| context: context | |
| }); | |
| } | |
| return { | |
| publish: publish, | |
| subscribe: subscribe | |
| }; | |
| })(); |
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| <element name="subscriber"> | |
| <template> | |
| <h5>The subscriber: {{value}}</h5> | |
| </template> | |
| <script> | |
| Polymer.register(this, { | |
| ready: function() { | |
| pubsub.subscribe("value:changed", function(val) { | |
| this.value = val; | |
| }, this); | |
| }, | |
| value: "unset" | |
| }); | |
| </script> | |
| </element> |
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