Created
January 22, 2012 14:48
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A small shim for the setImmediate() that creates a callback similar to process.nextTick() on node.js
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| (function (global, prefixes, timeouts, id, i) { | |
| if (typeof process !== 'undefined' && process && process.nextTick) { | |
| global.setImmediate = function (callback, args) { | |
| var i = id; | |
| timeouts[id] = { | |
| c: callback, | |
| a: args || [], | |
| }; | |
| process.nextTick(function () { | |
| var t = timeouts[i]; | |
| if (t) { | |
| t.c.apply(global, t.a); | |
| delete timeouts[i]; | |
| } | |
| }); | |
| return id++; | |
| }; | |
| global.clearImmediate = function (id) { | |
| timeouts[id] && delete timeouts[id]; | |
| }; | |
| return; | |
| } | |
| for (i=0; !global.setImmediate && i<prefixes.length; i++) { | |
| global.setImmediate = global[prefixes[i] + 'SetImmediate']; | |
| global.clearImmediate = global[prefixes[i] + 'ClearImmediate']; | |
| } | |
| if (!global.setImmediate && global.postMessage && global.addEventListener) { | |
| global.addEventListener('message', function (e) { | |
| if (!e.data || e.source !== global || !e.data.setImmediate) return; | |
| e.preventDefault && e.preventDefault(); | |
| e.stopPropagation && e.stopPropagation(); | |
| var t = timeouts[e.data.setImmediate]; | |
| if (t) { | |
| t.c.apply(global, t.a); | |
| delete timeouts[e.data.setImmediate]; | |
| } | |
| }, true); | |
| global.setImmediate = function (callback, args) { | |
| timeouts[id] = { | |
| c: callback, | |
| a: args || [], | |
| }; | |
| global.postMessage({ | |
| setImmediate: id, | |
| }, '*'); | |
| return id++; | |
| }; | |
| global.clearImmediate = function (id) { | |
| timeouts[id] && delete timeouts[id]; | |
| }; | |
| return; | |
| } | |
| if (!global.setImmediate && global.setInterval) { | |
| global.setImmediate = function (callback, args) { | |
| return global.setTimeout(callback, 0, args); | |
| }; | |
| global.clearImmediate = global.clearTimeout; | |
| return; | |
| } | |
| }(typeof global !== 'undefined' && global ? global : this, ['webkit', 'moz', 'ms', 'o'], {}, +new Date)); |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| </head> | |
| <body> | |
| <div id="r"></div> | |
| <script src="setImmediate.js"></script> | |
| <script> | |
| function printResult () { | |
| var e = document.createElement('div'); | |
| e.appendChild(document.createTextNode([].slice.call(arguments).join(' '))); | |
| document.getElementById('r').appendChild(e); | |
| } | |
| var start = +new Date; | |
| setImmediate(function (s) { | |
| printResult('It worked and took', +new Date - s, 'milliseconds.'); | |
| }, [start]); | |
| var canceling = setImmediate(function () { | |
| printResult('ERROR: this should not have appeared.'); | |
| }); | |
| printResult('Attempting to cancel immediate with id:', canceling); | |
| clearImmediate(canceling); | |
| </script> | |
| </body> | |
| </html> |
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| // Test for node.js and jsshell (unsupported because it doesn't even have setTimeout) | |
| typeof require === 'undefined' ? load('setImmediate.js') : require('./setImmediate.js'); | |
| function printResult () { | |
| var msg = [].slice.call(arguments).join(' '); | |
| typeof print === 'undefined' ? console.log(msg) : print(msg); | |
| } | |
| var start = +new Date; | |
| setImmediate(function (s) { | |
| printResult('It worked and took', +new Date - s, 'milliseconds.'); | |
| }, [start]); | |
| var canceling = setImmediate(function () { | |
| printResult('ERROR: this should not have appeared.'); | |
| }); | |
| printResult('Attempting to cancel immediate with id:', canceling); | |
| clearImmediate(canceling); |
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