Created
May 6, 2016 03:19
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Javascript Promise Example
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| // simulation library | |
| function asyncLib() { | |
| return { | |
| CallfnSyncLib: CallfnSyncLib | |
| } | |
| function CallfnSyncLib(params) { | |
| return new Promise(function(resolve, reject) { | |
| fnSyncLib(params, resolve, reject); | |
| }); | |
| } | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <!-- fallback for browsers which do not support promise --> | |
| <script src="es6-promise.min.js"></script> | |
| <script src="syncLib.js"></script> | |
| <script src="asyncLib.js"></script> | |
| <script> | |
| function onSuccess(response) | |
| { | |
| document.getElementById("divresponse").innerHTML = response; | |
| } | |
| function onError(error) | |
| { | |
| document.getElementById("divresponse").innerHTML = error.message; | |
| } | |
| function demoCallPromiseFn(params){ | |
| document.getElementById("divresponse").innerHTML = "computing...."; | |
| var objsyncLib=asyncLib(); | |
| objsyncLib.CallfnSyncLib(params).then(onSuccess, onError); | |
| } | |
| </script> | |
| <body onload="javascript:demoCallPromiseFn(null);"> | |
| <div id="divresponse"> | |
| </div> | |
| </body> | |
| </html> |
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| // simulation library | |
| function fnSyncLib(params, onSuccess, onError) { | |
| function fnTry(fn) { | |
| try { | |
| return fn(); | |
| } catch (ex) { | |
| console.log(ex.message + "\r\n\r\n" + ex.stack); | |
| fnOnError(ex); | |
| } | |
| } | |
| function fnOnError(error) { | |
| console.log("fnSyncLib error: " + error.message); | |
| onError(error); | |
| } | |
| function fnSimulateRemoteCall() { | |
| var startdate = new Date().getTime(); | |
| //hang on for a while | |
| sleepFor(5000); | |
| var endDate = new Date().getTime(); | |
| console.log(startdate); | |
| console.log(endDate); | |
| var response = "It took me 5 seconds"; | |
| onSuccess(response); | |
| } | |
| function sleepFor(sleepDuration) { | |
| var now = new Date().getTime(); | |
| while (new Date().getTime() < now + sleepDuration) { /* do nothing */ } | |
| } | |
| // initialize function here | |
| fnTry(fnSimulateRemoteCall); | |
| } |
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