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June 8, 2011 22:13
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JS event loop example - uncomment alerts to see how blocking can stop whole app even if it is asynchronous & event based
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta http-equiv="content-type" content="text/html; charset=utf-8"> | |
| <script src="http://yui.yahooapis.com/3.3.0/build/yui/yui-min.js" charset="utf-8" type="text/javascript"> | |
| </script> | |
| <title>Event Loop</title> | |
| <style type="text/css"> | |
| div {height: 5px; margin-bottom: 3px;} | |
| </style> | |
| </head> | |
| <body> | |
| <script type="text/javascript"> | |
| YUI().use('node', 'event-custom', function(Y) { | |
| var create10divs = function(color) { | |
| for(var i = 1; i < 10; i++) { | |
| var d = Y.Node.create('<div style="background:'+color+'"><\/div>'); | |
| Y.one('body').append(d) | |
| } | |
| } | |
| Y.on('event1', function(){ | |
| create10divs('red'); | |
| Y.fire('event4'); | |
| }) | |
| Y.on('event2', function(){ | |
| //alert('block!') | |
| create10divs('green') | |
| }) | |
| Y.on('event3', function(){ | |
| create10divs('blue') | |
| }) | |
| Y.on('event4', function(){ | |
| create10divs('pink') | |
| }) | |
| Y.later(10, Y, function(){ | |
| create10divs('orange') | |
| }); | |
| Y.on('domready', function(){ | |
| //alert('block!') | |
| create10divs('black') | |
| }) | |
| create10divs('purple') | |
| var counter = 0; | |
| var timer = Y.later(10, Y, function() { | |
| counter++; | |
| Y.fire('event'+counter); | |
| if(counter === 3) { | |
| timer.cancel(); | |
| } | |
| }, [], true); | |
| }) | |
| </script> | |
| </body> | |
| </html> |
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