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jschain

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jschain - npm Package Compare versions

Comparing version 0.0.2 to 0.0.3

34

jschain.js

@@ -39,6 +39,17 @@ /*

this.____items = []; //this remembers the callback functions list
this.____next = function() //execute next function
this.____finally = null;
this.____next = function(jump) //execute next function
{
var func = self.____items.shift();
if (func) func.call();
if (!jump)
{
var func = self.____items.shift();
if (func) func.call();
}
else self.____items = [];
if (self.____items.length == 0 && typeof self.____finally == 'function')
{
self.____finally.call(obj);
self.____finally = null;
}
};

@@ -48,5 +59,4 @@

{
var args = [].slice.call(arguments,1);
var args = [].slice.call(arguments,1),func = arguments[0];
args.push(self.____next);
var func = arguments[0];
self.____items.push(function()

@@ -59,2 +69,8 @@ {

this.end = function(func) //support for final function
{
self.____finally = func;
return self;
};
//copy and wrap the methods of obj

@@ -69,3 +85,3 @@ for(var func in obj)

{
var args = [].slice.call(arguments); //change arguments as an array
var args = [].slice.call(arguments);
args.push(self.____next); //pass next callback to the last argument

@@ -83,7 +99,3 @@ self.____items.push(function() //wrap the function and push into callbacks array

//start execute the chained functions in next tick
setTimeout(function()
{
self.____next();
},0);
setTimeout(self.____next,0);
return this;

@@ -90,0 +102,0 @@ }

78

node_test.js

@@ -0,1 +1,5 @@

var JSChain = require('./jschain');
new JSChain(

@@ -17,3 +21,3 @@ {

setTimeout(next,1000);
}).exec(function()
}).end(function()
{

@@ -30,3 +34,3 @@

console.log('done');
next();
next( url == 'http://example.com/4' );
},1000);

@@ -37,69 +41,17 @@ }

var chain = new JSChain({getURL: getURL});
for(var i=1;i<100;i++)
chain.end(function()
{
console.log('chain.end');
});
for(var i=1;i<10;i++)
{
chain.getURL('http://example.com/'+i);
}
chain.exec(function()
chain.exec(function(next)
{
console.log('DONE!!!');
console.log('before end');
next();
});
});
function JSChain(obj)
{
var self = this;
this.____items = [];
this.____next = function()
{
var func = self.____items.shift();
if (func) func.call();
}
this.exec = function()
{
var args = [].slice.call(arguments,1);
args.push(self.____next);
var func = arguments[0];
self.____items.push(function()
{
func.apply(obj,args);
});
return self;
}
for(var func in obj)
{
if (typeof obj[func] == 'function' && obj.hasOwnProperty(func))
{
(function(func)
{
self[func] = function()
{
var args = [].slice.call(arguments);
args.push(self.____next);
self.____items.push(function()
{
obj[func].apply(obj,args);
});
return self;
}
})(func);
}
}
//start execute the chained functions in next tick
setTimeout(function()
{
self.____next();
},0);
return this;
}

3

package.json

@@ -10,3 +10,3 @@ {

],
"version": "0.0.2",
"version": "0.0.3",
"author": "Chunlong Liu <longbill.cn@gmail.com>",

@@ -19,3 +19,2 @@ "engines": [

"directories": {
"test": "test"
},

@@ -22,0 +21,0 @@ "scripts": {

95

README.md

@@ -12,3 +12,3 @@ # Javascript Chain #

```javascript
new JSChain(
var _map =
{

@@ -25,7 +25,9 @@ foo: function(next)

}
}).foo().bar('hello','world').exec(function(next)
};
new JSChain(_map).foo().bar('hello','world').exec(function(next)
{
console.log('cumtome function');
setTimeout(next,1000);
}).exec(function()
}).end(function()
{

@@ -36,6 +38,6 @@ console.log('done');

##When to use it?##
## Background ##
Javascript callbacks may looks like this:
Old days, you might write something like this:
```javascript

@@ -81,3 +83,3 @@ ajaxGet('http://something',function(a)

setTimeout(next,1000);
}).exec(function()
}).end(function()
{

@@ -89,2 +91,3 @@ console.log('done');

With the help of JSChain, the first demo code could be written like this:
```javascript

@@ -95,3 +98,3 @@ var myController =

saveToDatabase: function(a,next){ ... ... next(); },
notifyUser: function() { ... arguments[arguments.length-1].call(); ... },
notifyUser: function() { ... next(); },
markNotified: function(next){ ... next(); ... }

@@ -104,2 +107,3 @@ };

And JSChain is very useful for data scraping projects:
```javascript

@@ -124,3 +128,3 @@ function getURL(url,next)

The JSChain itself is very tiny. The full documented source code of JSChain is only 1.6KB. I can paste the source code here, so you can read the source code. This could help you understand how it works.
The JSChain itself is very small. The full documented source code of JSChain is only 1.6KB. I can paste the source code here, so you can read the source code. This could help you understand how it works.

@@ -132,6 +136,17 @@ ```javascript

this.____items = []; //this remembers the callback functions list
this.____next = function() //execute next function
this.____finally = null;
this.____next = function(jump) //execute next function
{
var func = self.____items.shift();
if (func) func.call();
if (!jump)
{
var func = self.____items.shift();
if (func) func.call();
}
else self.____items = [];
if (self.____items.length == 0 && typeof self.____finally == 'function')
{
self.____finally.call(obj);
self.____finally = null;
}
};

@@ -141,5 +156,4 @@

{
var args = [].slice.call(arguments,1);
var args = [].slice.call(arguments,1),func = arguments[0];
args.push(self.____next);
var func = arguments[0];
self.____items.push(function()

@@ -152,2 +166,8 @@ {

this.end = function(func) //support for final function
{
self.____finally = func;
return self;
};
//copy and wrap the methods of obj

@@ -162,3 +182,3 @@ for(var func in obj)

{
var args = [].slice.call(arguments); //change arguments as an array
var args = [].slice.call(arguments);
args.push(self.____next); //pass next callback to the last argument

@@ -171,3 +191,3 @@ self.____items.push(function() //wrap the function and push into callbacks array

}
})(func); // this is the closure trick
})(func); // this is the closure tricks
}

@@ -177,7 +197,3 @@ }

//start execute the chained functions in next tick
setTimeout(function()
{
self.____next();
},0);
setTimeout(self.____next,0);
return this;

@@ -187,3 +203,40 @@ }

Good luck.
##Advanced features##
###end method###
An `end` method can add a function to the end of the chain. You can not define this in the object when new JSChian().
###jump to the end instead of going to next###
When you call `next` method, if you pass a `true` value into `next()` method, that means JUMP TO THE END.
###data passing along functions###
```
var obj =
{
a: function(i,next)
{
this.A = i.toUpperCase();
next();
},
b: function(next)
{
this.B = this.A+'B';
next();
}
};
var c = new JSChain(obj);
c.a('a')
.b()
.exec(function()
{
console.log(this);
});
```
this will output:
```
{ a: [Function], b: [Function], A: 'A', B: 'AB' }
```
test.html

Sorry, the diff of this file is not supported yet

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