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Pattern Examples
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<html> | |
<head> | |
<title>Facade Pattern</title> | |
</head> | |
<body> | |
<h1>Facade Pattern Example</h1> | |
<script type="text/javascript"> | |
!function (window, document) { | |
var module = window.module = {}, | |
i = 5; | |
module.get = function() { | |
document.write('<h2>current value:' + i + "</h2>"); | |
}; | |
module.set = function(val) { | |
i = val; | |
}; | |
module.run = function() { | |
document.write('<h3 style="color:blue">running</h3>'); | |
}; | |
module.jump = function() { | |
document.write('<h4>jumping</h4>'); | |
}; | |
}(window, document); | |
!function(window, module) { | |
var facade = window.facade = {}; | |
facade.module = module; | |
facade.setVal = function(val) { | |
module.set(val); | |
module.get(); | |
}; | |
facade.runAndJump = function() { | |
module.run(); | |
module.jump(); | |
}; | |
}(window, module); | |
facade.setVal(10); | |
facade.runAndJump(); | |
facade.module.run(); | |
</script> | |
</body> | |
</html> |
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<html> | |
<head> | |
<title>Mediator Pattern</title> | |
</head> | |
<body> | |
<h1>Mediator Pattern Example</h1> | |
<script type="text/javascript"> | |
!function() { | |
var mediator = window.mediator = {}, | |
channels = []; | |
mediator.subscribe = function(channel, func) { | |
if (!channels[channel]) { | |
channels[channel] = []; | |
} | |
channels[channel].push({ context: this, callback: func }); | |
return this; | |
}; | |
mediator.publish = function(channel) { | |
if(!channels[channel]) { | |
return false; | |
} | |
var args = Array.prototype.slice.call(arguments, 1); | |
for (var i=0,l=channels[channel].length; i<l; i=i+1) { | |
var subscription = channels[channel][i]; | |
subscription.callback.apply(subscription.context, args); | |
} | |
return this; | |
}; | |
mediator.installTo = function(obj) { | |
obj.subscribe = this.subscribe; | |
obj.publish = this.publish; | |
} | |
}(); | |
//Pub/sub on a centralized mediator | |
mediator.name = "tim" | |
mediator.subscribe('nameChange', function(arg) { | |
document.write("<h2>Centralized Mediator</h2>"); | |
document.write("<p>Old name: " + this.name + "</p>"); | |
this.name = arg; | |
document.write("<p>New name: " + this.name + "</p>"); | |
}); | |
mediator.publish('nameChange', 'david'); //tim, david | |
//Pub/sub via third party mediator | |
var obj = { name: 'sam' }; | |
mediator.installTo(obj); | |
obj.subscribe('nameChange', function(arg) { | |
document.write("<h3>Third Party Mediator</h3>"); | |
document.write("<p>Old name: " + this.name + "</p>"); | |
this.name = arg; | |
document.write("<p>New name: " + this.name + "</p>"); | |
}); | |
obj.publish('nameChange', 'john'); //sam, john | |
</script> | |
</body> | |
</html> |
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<html> | |
<head> | |
<title>Module Pattern</title> | |
</head> | |
<body> | |
<h1>Module Pattern Example</h1> | |
<script type="text/javascript"> | |
!function() { | |
var basketModule = window.basketModule = {}, | |
basket = []; | |
basketModule.addItem = function(values) { | |
basket.push(values); | |
}; | |
basketModule.getItemCount = function() { | |
return basket.length; | |
}; | |
basketModule.getTotal = function() { | |
var index = this.getItemCount(), | |
total = 0; | |
while(index--) { | |
total = total + basket[index].price; | |
} | |
return total; | |
}; | |
}(); | |
basketModule.addItem({item:'bread', price:2.5}); | |
basketModule.addItem({item:'butter', price:1.3}); | |
document.write("<h2>Item Count: " + basketModule.getItemCount() + "</h2>"); | |
document.write("<h3>Total: " + basketModule.getTotal() + "</h3>"); | |
document.write("<p>basketModule.basket: " + basketModule.basket + "</p>"); | |
</script> | |
</body> | |
</html> |
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