Created
August 24, 2014 13:14
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Convert Cordova-style callbacks to Nodejs-style callbacks
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| /** | |
| * Copy-paste this in your console to test if function works as expected | |
| **/ | |
| function toNodejsFn(cordovaFn,self){ | |
| return function(){ | |
| var args = Array.prototype.slice.call(arguments,0); | |
| var callback = args.splice(args.length-1,1)[0]; | |
| args.push(function onSuccess(){ | |
| var args = Array.prototype.slice.call(arguments, 0); | |
| args.unshift(null); | |
| callback.apply(self,args); | |
| }); | |
| args.push(function onError(){ | |
| var args = Array.prototype.slice.call(arguments, 0); | |
| // ensure the first argument is not-null | |
| if(args.length === 0 || !args[0]) args.unshift(true); | |
| callback.apply(self,args); | |
| }); | |
| cordovaFn.apply(cordovaFn,args); | |
| }; | |
| } | |
| function isSmaller(a,b,success,error){ | |
| if(a < b){ | |
| success(b-a); | |
| } else { | |
| error(); | |
| } | |
| } | |
| var isSmallerTest = toNodejsFn(isSmaller); | |
| isSmallerTest(1,3,function(err,res){ | |
| console.log('isSmaller(1,3): err === null',err === null); | |
| console.log('isSmaller(1,3): res === 2 (difference)',res === 2); | |
| }); | |
| isSmallerTest(4,1,function(err,res){ | |
| console.log('isSmaller(4,1): err !== null',err !== null); | |
| }); |
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| /** | |
| * convert a cordova-style function: fn(a,b,c,onSuccess,onError) | |
| * to a nodejs-style function: fn(a,b,c,callback) | |
| * | |
| * where callback is fn(err,response) and err should be falsy (null,false,0,'') for success responses | |
| * | |
| **/ | |
| module.exports = function toNodejsFn(cordovaFn,self){ | |
| return function(){ | |
| var args = Array.prototype.slice.call(arguments,0); | |
| var callback = args.splice(args.length-1,1)[0]; | |
| args.push(function onSuccess(){ | |
| var args = Array.prototype.slice.call(arguments, 0); | |
| args.unshift(null); | |
| callback.apply(self,args); | |
| }); | |
| args.push(function onError(){ | |
| var args = Array.prototype.slice.call(arguments, 0); | |
| // ensure the first argument is not-null | |
| if(args.length === 0 || !args[0]) args.unshift(true); | |
| callback.apply(self,args); | |
| }); | |
| cordovaFn.apply(cordovaFn,args); | |
| }; | |
| } |
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