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Cheat Sheet Backbone.js

Collegamento Eventi (Binding Events)

.on('event', callback)
.on('event', callback, context)
.on({
  'event1': callback,
  'event2': callback
})
.on('all', callback)
.once('event', callback)   // Aggiunge un evento personalizzato che viene eseguito una sola volta

Scollegamento Eventi (Unbinding Events)

object.off('change', onChange)    // solo il callback `onChange`
object.off('change')              // tutti i callback 'change'
object.off(null, onChange)        // callback `onChange` per tutti gli eventi
object.off(null, null, context)   // tutti i callback per `context` tutti gli eventi
object.off()                      // tutti

Attivazione Eventi (Trigger Events)

object.trigger('event')
view.listenTo(object, event, callback)
view.stopListening()

Elenco Eventi Predefiniti (Built-in Events)

  • Collezione (Collection):

    • add (model, collection, options)
    • remove (model, collection, options)
    • reset (collection, options)
    • sort (collection, options)
  • Modello (Model):

    • change (model, options)
    • change:[attr] (model, value, options)
    • destroy (model, collection, options)
    • error (model, xhr, options)
  • Modello e collezione:

    • request (model, xhr, options)
    • sync (model, resp, options)
  • Router:

    • route:[name] (params)
    • route (router, route, params)

Viste (Views)

Definire le Viste

// Tutti gli attributi sono opzionali
var View = Backbone.View.extend({
  model: doc,
  tagName: 'div',
  className: 'document-item',
  id: "document-" + doc.id,
  attributes: { href: '#' },
  el: 'body',
  events: {
    'click button.save': 'save',
    'click .cancel': function() { ··· },
    'click': 'onclick'
  },
  constructor: function() { ··· },
  render: function() { ··· }
})

Istanziazione della Vista (View Instantiation)

view = new View()
view = new View({ el: ··· })

Metodi della Vista (View Methods)

view.$el.show()
view.$('input')
view.remove()
view.delegateEvents()
view.undelegateEvents()

Modelli (Models)

Definire i Modelli

// Tutti gli attributi sono opzionali
var Model = Backbone.Model.extend({
  defaults: {
    'author': 'unknown'
  },
  idAttribute: '_id',
  parse: function() { ··· }
})

Istanziazione del Modello (Model Instantiation)

var obj = new Model({ title: 'Lolita', author: 'Nabokov' })
var obj = new Model({ collection: ··· })

Metodi del Modello (Model Methods)

obj.id
obj.cid   // → 'c38' (ID lato client)
obj.clone()
obj.hasChanged('title')
obj.changedAttributes()  // false o hash
obj.previousAttributes() // false o hash
obj.previous('title')
obj.isNew()
obj.set({ title: 'A Study in Pink' })
obj.set({ title: 'A Study in Pink' }, { validate: true, silent: true })
obj.unset('title')
obj.get('title')
obj.has('title')
obj.escape('title')     /* Come .get() ma con escape HTML */
obj.clear()
obj.clear({ silent: true })
obj.save()
obj.save({ attributes })
obj.save(null, {
  silent: true, patch: true, wait: true,
  success: callback, error: callback
})
obj.destroy()
obj.destroy({
  wait: true,
  success: callback, error: callback
})
obj.toJSON()
obj.fetch()
obj.fetch({ success: callback, error: callback })

Validazione (Validation)

var Model = Backbone.Model.extend({
  validate: function(attrs, options) {
    if (attrs.end < attrs.start) {
      return "Can't end before it starts"
    }
  }
})

{: data-line=“2”}

obj.validationError  //=> "Can't end before it starts"
obj.isValid()
obj.on('invalid', function (model, error) { ··· })
// Attivato su:
obj.save()
obj.set({ ··· }, { validate: true })

URL Personalizzati (Custom URLs)

var Model = Backbone.Model.extend({
  // URL singolo (stringa o funzione)
  url: '/account',
  url: function() { return '/account' },
  // Entrambi funzionano allo stesso modo
  url: function() { return '/books/' + this.id }),
  urlRoot: '/books'
})
var obj = new Model({ url: ··· })
var obj = new Model({ urlRoot: ··· })