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todos.coffee
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todos.coffee
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# An example Backbone application contributed by
# [Jérôme Gravel-Niquet](http://jgn.me/). This demo uses a simple
# [LocalStorage adapter](backbone-localstorage.html)
# to persist Backbone models within your browser.
#
# This [CoffeeScript](http://jashkenas.github.com/coffee-script/) variation has been provided by [Jason Giedymin](http://jasongiedymin.com/).
#
# Note: two things you will notice with my CoffeeScript are that I prefer to
# use four space indents and prefer to use `()` for all functions.
# Load the application once the DOM is ready, using a `jQuery.ready` shortcut.
$ ->
### Todo Model ###
# Our basic **Todo** model has `content`, `order`, and `done` attributes.
class Todo extends Backbone.Model
# Default attributes for the todo.
defaults:
content: "empty todo..."
done: false
# Ensure that each todo created has `content`.
initialize: ->
if !@get("content")
@set({ "content": @defaults.content })
# Toggle the `done` state of this todo item.
toggle: ->
@save({ done: !@get("done") })
# Remove this Todo from *localStorage* and delete its view.
clear: ->
@destroy()
@view.remove()
### Todo Collection ###
# The collection of todos is backed by *localStorage* instead of a remote
# server.
class TodoList extends Backbone.Collection
# Reference to this collection's model.
model: Todo
# Save all of the todo items under the `"todos"` namespace.
localStorage: new Store("todos")
# Attribute getter/setter
getDone = (todo) ->
return todo.get("done")
# Filter down the list of all todo items that are finished.
done: ->
return @filter( getDone )
# Filter down the list to only todo items that are still not finished.
remaining: ->
return @without.apply( this, @done() )
# We keep the Todos in sequential order, despite being saved by unordered
# GUID in the database. This generates the next order number for new items.
nextOrder: ->
return 1 if !@length
return @last().get('order') + 1
# Todos are sorted by their original insertion order.
comparator: (todo) ->
return todo.get("order")
### Todo Item View ###
# The DOM element for a todo item...
class TodoView extends Backbone.View
#... is a list tag.
tagName: "li"
# Cache the template function for a single item.
template: _.template( $("#item-template").html() )
# The DOM events specific to an item.
events:
"click .check" : "toggleDone",
"dblclick div.todo-content" : "edit",
"click span.todo-destroy" : "clear",
"keypress .todo-input" : "updateOnEnter"
# The TodoView listens for changes to its model, re-rendering. Since there's
# a one-to-one correspondence between a **Todo** and a **TodoView** in this
# app, we set a direct reference on the model for convenience.
initialize: ->
@model.bind('change', this.render);
@model.view = this;
# Re-render the contents of the todo item.
render: =>
this.$(@el).html( @template(@model.toJSON()) )
@setContent()
return this
# To avoid XSS (not that it would be harmful in this particular app),
# we use `jQuery.text` to set the contents of the todo item.
setContent: ->
content = @model.get("content")
this.$(".todo-content").text(content)
@input = this.$(".todo-input");
@input.bind("blur", @close);
@input.val(content);
# Toggle the `"done"` state of the model.
toggleDone: ->
@model.toggle()
# Switch this view into `"editing"` mode, displaying the input field.
edit: =>
this.$(@el).addClass("editing")
@input.focus()
# Close the `"editing"` mode, saving changes to the todo.
close: =>
@model.save({ content: @input.val() })
$(@el).removeClass("editing")
# If you hit `enter`, we're through editing the item.
updateOnEnter: (e) =>
@close() if e.keyCode is 13
# Remove this view from the DOM.
remove: ->
$(@el).remove()
# Remove the item, destroy the model.
clear: () ->
@model.clear()
### The Application ###
# Our overall **AppView** is the top-level piece of UI.
class AppView extends Backbone.View
# Instead of generating a new element, bind to the existing skeleton of
# the App already present in the HTML.
el_tag = "#todoapp"
el: $(el_tag)
# Our template for the line of statistics at the bottom of the app.
statsTemplate: _.template( $("#stats-template").html() )
# Delegated events for creating new items, and clearing completed ones.
events:
"keypress #new-todo" : "createOnEnter",
"keyup #new-todo" : "showTooltip",
"click .todo-clear a" : "clearCompleted"
# At initialization we bind to the relevant events on the `Todos`
# collection, when items are added or changed. Kick things off by
# loading any preexisting todos that might be saved in *localStorage*.
initialize: =>
@input = this.$("#new-todo")
Todos.bind("add", @addOne)
Todos.bind("reset", @addAll)
Todos.bind("all", @render)
Todos.fetch()
# Re-rendering the App just means refreshing the statistics -- the rest
# of the app doesn't change.
render: =>
this.$('#todo-stats').html( @statsTemplate({
total: Todos.length,
done: Todos.done().length,
remaining: Todos.remaining().length
}))
# Add a single todo item to the list by creating a view for it, and
# appending its element to the `<ul>`.
addOne: (todo) =>
view = new TodoView( {model: todo} )
this.$("#todo-list").append( view.render().el )
# Add all items in the **Todos** collection at once.
addAll: =>
Todos.each(@addOne);
# Generate the attributes for a new Todo item.
newAttributes: ->
return {
content: @input.val(),
order: Todos.nextOrder(),
done: false
}
# If you hit return in the main input field, create new **Todo** model,
# persisting it to *localStorage*.
createOnEnter: (e) ->
return if (e.keyCode != 13)
Todos.create( @newAttributes() )
@input.val('')
# Clear all done todo items, destroying their models.
clearCompleted: ->
_.each(Todos.done(), (todo) ->
todo.clear()
)
return false
# Lazily show the tooltip that tells you to press `enter` to save
# a new todo item, after one second.
showTooltip: (e) ->
tooltip = this.$(".ui-tooltip-top")
val = @input.val()
tooltip.fadeOut()
clearTimeout(@tooltipTimeout) if (@tooltipTimeout)
return if (val is '' || val is @input.attr("placeholder"))
show = () ->
tooltip.show().fadeIn()
@tooltipTimeout = _.delay(show, 1000)
# Create our global collection of **Todos**.
# Note: I've actually chosen not to export globally to `window`.
# Original documentation has been left intact.
Todos = new TodoList
App = new AppView()