/examples/todos-requirejs-1/todos.js
JavaScript | 237 lines | 130 code | 48 blank | 59 comment | 11 complexity | 7e7b04334ad76d893061c02fcd47b947 MD5 | raw file
- // An example Backbone application contributed by
- // [J茅r么me Gravel-Niquet](http://jgn.me/). This demo uses a simple
- // [LocalStorage adapter](backbone-localstorage.html)
- // to persist Backbone models within your browser.
- // Load the application once the DOM is ready, using `jQuery.ready`:
- define (function () {
- var Todo, TodoList, Todos, TodoView, AppView, module = {};
- // Todo Model
- // ----------
- // Our basic **Todo** model has `text`, `order`, and `done` attributes.
- Todo = Backbone.Model.extend({
- // Default attributes for a todo item.
- defaults: function() {
- return {
- done: false,
- order: Todos.nextOrder()
- };
- },
- // Toggle the `done` state of this todo item.
- toggle: function() {
- this.save({done: !this.get("done")});
- }
- });
- // Todo Collection
- // ---------------
- // The collection of todos is backed by *localStorage* instead of a remote
- // server.
- TodoList = Backbone.Collection.extend({
- // Reference to this collection's model.
- model: Todo,
- // Save all of the todo items under the `"todos"` namespace.
- localStorage: new Store("todos"),
- // Filter down the list of all todo items that are finished.
- done: function() {
- return this.filter(function(todo){ return todo.get('done'); });
- },
- // Filter down the list to only todo items that are still not finished.
- remaining: function() {
- return this.without.apply(this, 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: function() {
- if (!this.length) return 1;
- return this.last().get('order') + 1;
- },
- // Todos are sorted by their original insertion order.
- comparator: function(todo) {
- return todo.get('order');
- }
- });
- // Create our global collection of **Todos**.
- Todos = new TodoList;
- // Todo Item View
- // --------------
- // The DOM element for a todo item...
- TodoView = Backbone.View.extend({
- //... 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-text" : "edit",
- "click span.todo-destroy" : "clear",
- "keypress .todo-input" : "updateOnEnter"
- },
- // The TodoView listens for changes to its model, re-rendering.
- initialize: function() {
- this.model.bind('change', this.render, this);
- this.model.bind('destroy', this.remove, this);
- },
- // Re-render the contents of the todo item.
- render: function() {
- $(this.el).html(this.template(this.model.toJSON()));
- this.setText();
- return this;
- },
- // To avoid XSS (not that it would be harmful in this particular app),
- // we use `jQuery.text` to set the contents of the todo item.
- setText: function() {
- var text = this.model.get('text');
- this.$('.todo-text').text(text);
- this.input = this.$('.todo-input');
- this.input.bind('blur', _.bind(this.close, this)).val(text);
- },
- // Toggle the `"done"` state of the model.
- toggleDone: function() {
- this.model.toggle();
- },
- // Switch this view into `"editing"` mode, displaying the input field.
- edit: function() {
- $(this.el).addClass("editing");
- this.input.focus();
- },
- // Close the `"editing"` mode, saving changes to the todo.
- close: function() {
- this.model.save({text: this.input.val()});
- $(this.el).removeClass("editing");
- },
- // If you hit `enter`, we're through editing the item.
- updateOnEnter: function(e) {
- if (e.keyCode == 13) this.close();
- },
- // Remove this view from the DOM.
- remove: function() {
- $(this.el).remove();
- },
- // Remove the item, destroy the model.
- clear: function() {
- this.model.destroy();
- }
- });
- // The Application
- // ---------------
- // Our overall **AppView** is the top-level piece of UI.
- AppView = Backbone.View.extend({
- // Instead of generating a new element, bind to the existing skeleton of
- // the App already present in the HTML.
- el: $("#todoapp"),
- // Our template for the line of statistics at the bottom of the app.
- statsTemplate: _.template($('#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: function() {
- this.input = this.$("#new-todo");
- Todos.bind('add', this.addOne, this);
- Todos.bind('reset', this.addAll, this);
- Todos.bind('all', this.render, this);
- Todos.fetch();
- },
- // Re-rendering the App just means refreshing the statistics -- the rest
- // of the app doesn't change.
- render: function() {
- this.$('#todo-stats').html(this.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: function(todo) {
- var view = new TodoView({model: todo});
- this.$("#todo-list").append(view.render().el);
- },
- // Add all items in the **Todos** collection at once.
- addAll: function() {
- Todos.each(this.addOne);
- },
- // If you hit return in the main input field, and there is text to save,
- // create new **Todo** model persisting it to *localStorage*.
- createOnEnter: function(e) {
- var text = this.input.val();
- if (!text || e.keyCode != 13) return;
- Todos.create({text: text});
- this.input.val('');
- },
- // Clear all done todo items, destroying their models.
- clearCompleted: function() {
- _.each(Todos.done(), function(todo){ todo.destroy(); });
- return false;
- },
- // Lazily show the tooltip that tells you to press `enter` to save
- // a new todo item, after one second.
- showTooltip: function(e) {
- var tooltip = this.$(".ui-tooltip-top");
- var val = this.input.val();
- tooltip.fadeOut();
- if (this.tooltipTimeout) clearTimeout(this.tooltipTimeout);
- if (val == '' || val == this.input.attr('placeholder')) return;
- var show = function(){ tooltip.show().fadeIn(); };
- this.tooltipTimeout = _.delay(show, 1000);
- }
- });
- // Finally, we kick things off by creating the **App**.
- module.init = function () {
- return new AppView;
- }
-
- return module;
- });