/modules/M5/todos.js
JavaScript | 305 lines | 175 code | 57 blank | 73 comment | 19 complexity | dabc1103fdfa06388bef7be6b1dc03f8 MD5 | raw file
- // 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.
- // Load the application once the DOM is ready, using `jQuery.ready`:
- $(function(){
- // Todo Model
- // ----------
- // Our basic **Todo** model has `content`, `order`, and `done` attributes.
- window.Todo = Backbone.Model.extend({
- // If you don't provide a todo, one will be provided for you.
- EMPTY: "empty todo...",
- // Ensure that each todo created has `content`.
- initialize: function() {
- if (!this.get("content")) {
- this.set({"content": this.EMPTY});
- }
- },
- countSheep: function() {
- var start = new Date();
- while (true) {
- var now = new Date();
- if (now - start > 500) {
- return;
- }
- }
- },
- // Toggle the `done` state of this todo item.
- toggle: function() {
- //this.countSheep();
- this.save({done: !this.get("done")});
-
- if (Todos.remaining().length == 0){
- window.console && console.log('woohoo! you finished all your items! highfive! _o/\o_');
- }
-
- },
- // Remove this Todo from *localStorage* and delete its view.
- clear: function() {
- this.destroy();
- this.view.remove();
- },
- // Set this Todo's location to be the current one
- setCurrentLocation: function() {
- // TODO(M3): Implement this
- var todo = this;
- // Check that we're using a supported API
- if (Modernizr.geolocation) {
- navigator.geolocation.getCurrentPosition(function(position) {
- todo.set({'lat': position.coords.latitude,
- 'lon': position.coords.longitude});
- });
- }
- }
- });
- // Todo Collection
- // ---------------
- // The collection of todos is backed by *localStorage* instead of a remote
- // server.
- window.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**.
- window.Todos = new TodoList;
- // Todo Item View
- // --------------
- // The DOM element for a todo item...
- window.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-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: function() {
- _.bindAll(this, 'render', 'close');
- this.model.bind('change', this.render);
- this.model.view = this;
- },
- // Re-render the contents of the todo item.
- render: function() {
- var el = $(this.el);
- var model = this.model;
- el.html(this.template(this.model.toJSON()));
- this.setContent();
- return this;
- },
- // To avoid XSS (not that it would be harmful in this particular app),
- // we use `jQuery.text` to set the contents of the todo item.
- setContent: function() {
- var content = this.model.get('content');
- this.$('.todo-content').text(content);
- this.input = this.$('.todo-input');
- this.input.bind('blur', this.close);
- this.input.val(content);
- // Render location
- if (this.model.get('lat') && this.model.get('lon')) {
- this.$('.todo-location').text(
- this.model.get('lat') + ',' + this.model.get('lon')
- );
- }
- },
- // Toggle the `"done"` state of the model.
- toggleDone: function() {
- this.model.toggle();
- // Since the view will get regenerated every time we change the
- // DOM, set a class on the li element
- $(this.el).toggleClass('complete', this.model.done);
- },
- // 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({content: 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() {
- var el = $(this.el);
- // Remove the element once the transition is complete
- el.bind('webkitTransitionEnd', function() {
- el.remove();
- });
- // Add a "removing" class
- el.addClass('removing');
- },
- // Remove the item, destroy the model.
- clear: function() {
- this.model.clear();
- },
- });
- // The Application
- // ---------------
- // Our overall **AppView** is the top-level piece of UI.
- window.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() {
- _.bindAll(this, 'addOne', 'addAll', 'render');
- this.input = this.$("#new-todo");
- Todos.bind('add', this.addOne);
- Todos.bind('refresh', this.addAll);
- Todos.bind('all', this.render);
- Todos.fetch();
- },
- // Re-rendering the App just means refreshing the statistics -- the rest
- // of the app doesn't change.
- render: function() {
- var done = Todos.done().length;
- this.$('#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.$("#todo-list").append(view.render().el);
- },
- // Add all items in the **Todos** collection at once.
- addAll: function() {
- Todos.each(this.addOne);
- },
- // Generate the attributes for a new Todo item.
- newAttributes: function() {
- return {
- content: this.input.val(),
- order: Todos.nextOrder(),
- done: false,
- old: false
- };
- },
- // If you hit return in the main input field, create new **Todo** model,
- // persisting it to *localStorage*.
- createOnEnter: function(e) {
- if (e.keyCode != 13) return;
- var todo = Todos.create(this.newAttributes());
- todo.setCurrentLocation();
- this.input.val('');
- },
- // Clear all done todo items, destroying their models.
- clearCompleted: function() {
- _.each(Todos.done(), function(todo){ todo.clear(); });
- return false;
- },
- // Lazily show the tooltip that tells you to press `enter` to save
- // a new todo item, after one second.
- showTooltip: function(e) {
- var tooltip = this.$(".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**.
- window.App = new AppView;
- });