Convert the AppointmentForm
view below to use Mustache templating. Make sure you remember to change the <%= %>
placeholders with Mustache's {{}}
placeholders.
var AppointmentForm = Backbone.View.extend({ template: Mustache.compile('<form>' + '<input name="title" type="text" value="{{title }}" />' + '<input name="name" type="text" value="{{ name }}" /></form>'), render: function(){ this.$el.html(this.template(this.model.toJSON())); return this; } });
As you can see in our Appointment
view below, we are rendering the list of possible dates an appointment could occur. possibleDates
is an attribute on the Appointment
model, and it's value is always an array of strings.
Convert the view below to use Mustache.
App.Views.Appointment = Backbone.View.extend({ template: Mustache.compile('<h2>{{ title }}</h2>' + 'Possible Dates: <ul>{{ #possibleDates }}' + '<li>{{ . }}</li>' + '{{ /possibleDates }}</ul>'), render: function(){ this.$el.html(this.template(this.model.attributes)); return this; } });
possibleDates
has changed from an Array of strings to an Array of objects with day
and time
properties. Update the Mustache template below to render the li
tag with both day
and time
inside them, like so:
<li>Tuesday at 3:00pm</li>
App.Views.Appointment = Backbone.View.extend({ template: Mustache.compile('<h2>{{ title }}</h2>' + 'Possible Dates: <ul>{{#possibleDates}}' + '<li>{{day}} at {{time}}</li>' + '{{/possibleDates}}</ul>'), render: function(){ this.$el.html(this.template(this.model.attributes)); return this; } });
Dr. Goodparts has instituted a new (possibly controversial) policy: Appointments can not be changed. The office can create appointments, but they will no longer be able to update them or delete them.
To comply with this new policy, modify the Appointment
model's sync
function below to only work on read
andcreate
, but not on delete
and update
.
App.Models.Appointment = Backbone.Model.extend({ sync: function(method, model, options){ if (method === "read" || method === "create"){ Backbone.sync(method, model, options); }else { console.log("Dr. Goodparts says no!"); } } });
Well that was quick. Dr. Goodparts has changed his mind and now wants to be able to update and delete appointments again. Unfortunately, the server team has defected to Dr. Jay Query and so we've had to use HTML5 localStorage to store our appointments.
Below we've started to implement the localStorage strategy, handling the "read"
and "create"
methods. In this challenge, write the code to handle the "delete"
method.
App.Models.Appointment = Backbone.Model.extend({ sync: function(method, model, options){ options = options || {}; switch(method){ case 'delete': var key = "Appointment-" + model.id; localStorage.removeItem(key, JSON.stringify(model)); break; case 'update': break; case 'create': var key = "Appointment-" + model.id; localStorage.setItem(key, JSON.stringify(model)); break; case 'read': var key = "Appointment-" + model.id; var result = localStorage.getItem(key); if(result){ result = JSON.parse(result); options.success && options.success(result); }else if(options.error){ options.error("Couldn't find Appointment with id=" + model.id); } break; } } });
Fantastic! Now to finish it up, all you need to do is implement the update
case below. Use setItem
andJSON.stringify
, just like in the create
case.
App.Models.Appointment = Backbone.Model.extend({ sync: function(method, model, options){ options = options || {}; switch(method){ case "delete": var key = "Appointment-" + model.id; localStorage.removeItem(key); break; case "update": var key = "Appointment-" + model.id; localStorage.setItem(key, JSON.stringify(model)); break; case "create": var key = "Appointment-" + model.id; localStorage.setItem(key, JSON.stringify(model)); break; case "read": var key = "Appointment-" + model.id; var result = localStorage.getItem(key); if(result){ result = JSON.parse(result); options.success && options.success(result); }else if(options.error){ options.error("Couldn't find Appointment with id=" + model.id); } break; } } });