Created
May 8, 2012 17:16
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basic computed properties in backbone
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Namespace.models.Base = Backbone.Model.extend | |
initialize: ()-> | |
Backbone.Model::initialize @, arguments | |
return if _.isUndefined(@computed) | |
@_computed = {} | |
for attr, dependencies of @computed | |
@on "change:#{attr}", ()=> | |
@_computed[attr] = @[attr].call @ | |
_(dependencies).each (dep)=> | |
@on "change:#{dep}", ()=> | |
@trigger "change:#{attr}" | |
@trigger "change:#{attr}" if @has(dep) | |
get: (attr)-> | |
if @computed?.hasOwnProperty(attr) | |
@_computed[attr] | |
else | |
Backbone.Model::get.call @, attr | |
Namespace.models.Example = Namespace.models.Base.extend | |
computed: | |
fullName: ['firstName', 'lastName'] | |
fullName: ()-> | |
"#{@get('firstName')} #{@get('lastName')}" |
Cool, thanks
Greetings,
Here is a small function that implements computed properties for Backbone https://github.com/curran/backboneComputedProperties .
Regards,
Curran
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There are many ways to do it, it's all about pros, cons and personal preferences - to me this seems more complex and doesn't add much value.
I'm not suggesting it doesn't work, however there are a bunch of issues with it: