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define([
'jquery',
'underscore',
'backbone',
'collections/todos',
'views/todos',
'text!templates/stats.html'
], function($, _, Backbone, Todos, TodoView, statsTemplate){
var AppView = Backbone.View.extend({
// Instead of generating a new element, bind to the existing skeleton of
// the App already present in the HTML.
el: $("#todoapp"),
// Our template for the line of statistics at the bottom of the app.
statsTemplate: _.template(statsTemplate),
// Delegated events for creating new items, and clearing completed ones.
events: {
"keypress #new-todo": "createOnEnter",
"keyup #new-todo": "showTooltip",
"click .todo-clear a": "clearCompleted"
},
// At initialization we bind to the relevant events on the `Todos`
// collection, when items are added or changed. Kick things off by
// loading any preexisting todos that might be saved in *localStorage*.
initialize: function() {
_.bindAll(this, 'addOne', 'addAll', 'render');
this.input = this.$("#new-todo");
Todos.bind('add', this.addOne);
Todos.bind('reset', 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
};
},
// 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;
Todos.create(this.newAttributes());
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);
}
});
return AppView;
});
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