Created
June 12, 2014 19:37
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Event Hub
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| <html> | |
| <head> | |
| <title>Event Hub</title> | |
| <script src="hub.js"></script> | |
| <script> | |
| var subscription = hub.subscribe('/go', function(params) { | |
| console.log('one', params); | |
| }); | |
| var subscription2 = hub.subscribe('/go', function(params) { | |
| console.log('two', params); | |
| }); | |
| hub.subscribe('/extra', function(params) { | |
| console.log('extra', params); | |
| }); | |
| </script> | |
| </head> | |
| <body> | |
| <button id="go">go</button> | |
| <button id="unsubscribe1">unsubscribe 1</button> | |
| <button id="unsubscribe2">unsubscribe 2</button> | |
| <script> | |
| var d = document; | |
| d.getElementById('go').addEventListener('click', function(event) { | |
| hub.publish('/go', event.timeStamp); | |
| }); | |
| d.getElementById('unsubscribe1').addEventListener('click', function() { | |
| console.log('unsubscribe 1'); | |
| subscription.remove(); | |
| }); | |
| d.getElementById('unsubscribe2').addEventListener('click', function() { | |
| console.log('unsubscribe 2'); | |
| subscription2.remove(); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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| var hub = (function(){ | |
| var topics = {}; | |
| return { | |
| subscribe: function(topic, listener) { | |
| // Create the topic's object if not yet created | |
| if(!topics[topic]) topics[topic] = { queue: [] }; | |
| // Add the listener to queue | |
| var index = topics[topic].queue.push(listener) - 1; | |
| // Provide handle back for removal of topic | |
| return (function(topic, index) { | |
| return { | |
| remove: function() { | |
| delete topics[topic].queue[index]; | |
| } | |
| } | |
| })(topic, index); | |
| }, | |
| publish: function(topic, info) { | |
| // If the topic doesn't exist, or there's no listeners in queue, just leave | |
| if(!topics[topic] || !topics[topic].queue.length) return; | |
| // Cycle through topics queue, fire! | |
| var items = topics[topic].queue; | |
| for(var i = 0, len = items.length; i < len; i++) { | |
| if(typeof items[i] === 'function') items[i](info || {}); | |
| } | |
| } | |
| }; | |
| })(); |
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