Basic rough for implementing a Deferred process.
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/* | |
* referenced jQuery's Deferred pattern | |
*/ | |
(function(window, undefined){ | |
window.when = function() | |
{ | |
var _int = function(a) | |
{ | |
this.success = function(){}; | |
this.failure = function(){}; | |
this.dependents = []; | |
this.count = 0; | |
this.fire = 0; | |
this.stop = false; | |
var deferreddata = [].slice.call(a,0); | |
for( var i=0; i < deferreddata.length; i++ ) | |
{ | |
this.count += 1; | |
if( !deferreddata[i].promise ) | |
{ | |
deferreddata[i] = {value:deferreddata[i]}; | |
} | |
deferreddata[i].when = this; | |
this.dependents.push( deferreddata[i] ); | |
} | |
}; | |
_int.prototype.then = function(s, f) | |
{ | |
var istype = function(o) | |
{ | |
return {}.toString.call(o).match(/\s([a-z|A-Z]+)/)[1].toLowerCase(); | |
}; | |
if(istype(s) == "function") | |
{ | |
this.success = s; | |
} | |
if(istype(f) == "function") | |
{ | |
this.failure = f; | |
} | |
for( var i=0; i < this.dependents.length; i++ ) | |
{ | |
if( this.dependents[i].value ) | |
{ | |
process.call(this.dependents[i], this.dependents[i].value, 1); | |
} | |
} | |
}; | |
return new _int(arguments); | |
} | |
window.deferred = function() | |
{ | |
var _int = function(a){}; | |
_int.prototype.promise = function() | |
{ | |
return this; | |
}; | |
_int.prototype.resolve = function(v) | |
{ | |
if(!this.when.stop) | |
{ | |
process.call(this, v); | |
} | |
}; | |
_int.prototype.error = function(v) | |
{ | |
this.fail = true; | |
process.call(this, v); | |
}; | |
_int.prototype.cancel = function() | |
{ | |
this.when.stop = true; | |
}; | |
return new _int(arguments); | |
} | |
function process(v) | |
{ | |
this.value = v; | |
var howmany = this.when.count, | |
howmanyfired = (this.when.fire += 1), | |
dependents = this.when.dependents, | |
callback = (this.fail)? this.when.failure : this.when.success; | |
if( this.fail ) | |
{ | |
this.when.stop = true; | |
} | |
if(howmany == howmanyfired || this.fail) | |
{ | |
var temp = []; | |
for( var i=0; i < dependents.length; i++ ) | |
{ | |
temp.push(dependents[i].value); | |
if( this.fail && this===dependents[i] ) | |
{ | |
break; | |
} | |
} | |
callback.apply(this, temp); | |
} | |
} | |
})(this); |
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<!doctype html> | |
<html> | |
<head> | |
<meta charset="utf-8" /> | |
<title>JS.Deferred</title> | |
</head> | |
<body> | |
<div> | |
<!-- Begin Body - - - - - - - - - - - - - - - - - - - - - - - - - - --> | |
<h1>JS.Deferred</h1> | |
<p> | |
Sets out a rough Deferred pattern. | |
</p> | |
<!-- End Body - - - - - - - - - - - - - - - - - - - - - - - - - - --> | |
</div> | |
<script src="deferred.js"></script> | |
<script> | |
(function(window, undefined){ | |
//-- use deferred | |
when( DelayFunc1("one", 5000), DelayFunc2("two", 7000), "three" ) | |
.then(function( one, two, three ) | |
{ | |
console.log("success one = " + Array.prototype.join.call(arguments,",")); | |
}, | |
function( one, two, three ) | |
{ | |
console.log("error one = " + Array.prototype.join.call(arguments,",")); | |
}); | |
//-- no deferred | |
when( "one", "two", {"three":true} ) | |
.then(function( one, two, three ) | |
{ | |
console.log("success two = " + Array.prototype.join.call(arguments,",")); | |
}, | |
function( one, two, three ) | |
{ | |
console.log("error two = " + Array.prototype.slice.call(arguments,",")); | |
}); | |
//-- delay resolve | |
function DelayFunc1( str, time ) | |
{ | |
var def = deferred(); | |
setTimeout(function() | |
{ | |
def.resolve( "Success-"+str ); | |
},time); | |
return def.promise(); | |
} | |
//-- delay error | |
function DelayFunc2( str, time ) | |
{ | |
var def = deferred(); | |
setTimeout(function() | |
{ | |
def.error( "Error-"+str ); | |
},time); | |
return def.promise(); | |
} | |
//-- | |
function StringFormat() | |
{ | |
var args = Array.prototype.slice.call(arguments, 0), | |
string = args.shift(); | |
for(var i=0; i<args.length; i++) | |
{ | |
string = string.replace( new RegExp('\\{'+i+'\\}','g'), args[i]); | |
} | |
return string; | |
} | |
})(); | |
</script> | |
</body> | |
</html> |
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