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Easy multiple-inheritance in Backbone.js
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/* | |
multiple inheritance/mixins for backbone js | |
automatic init call to super classes and defaults attribute inheritance | |
clsbla = Backbone.Model.extend4000(cls1,cls2,mixin6,{ bla: 3 }) | |
*/ | |
(function () { | |
function extend4000 () { | |
var args = Array.prototype.slice.call(arguments), | |
child = this; | |
var initf = [] | |
var defaults = {} | |
if (child.prototype.defaults) { | |
defaults = _.clone(child.prototype.defaults) | |
} | |
_.each(args, function (superc) { | |
// did I receive a dictionary or an object/backbone model? | |
if (superc.prototype) { superc = superc.prototype } | |
// inherit defaults | |
if (superc.defaults) { | |
defaults = _.extend(defaults,superc.defaults) | |
} | |
// build a list of initialize functions if you find more then one | |
if (superc.initialize) { | |
(initf.length) || initf.push(child.prototype.initialize); | |
initf.push(superc.initialize) | |
} | |
child = child.extend(superc); | |
}); | |
// construct a combined init function | |
if (initf.length) { | |
child = child.extend({ initialize : function(attributes,options) { | |
var self = this | |
_.map(initf,function(initf) { initf.call(self,attributes,options) }) | |
}}) | |
} | |
child.prototype.defaults = defaults | |
return child; | |
} | |
Backbone.Model.extend4000 = | |
Backbone.Collection.extend4000 = | |
Backbone.Router.extendEach = | |
Backbone.View.extend4000 = extend4000; | |
})(); |
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