i am doing a Todo application in backbone. The sample was in Underscore template, but i am trying to use backbone with hogan template. its compiling good, but rendering is not working. It throws error.. Uncaught TypeError: Property 'template' of object [object Object] is not a function
This is my js file:
var app = app || {};
(function ($) {
'use strict';
// Todo Item View
// --------------
_.templateSettings = {
evaluate : /\{\[([\s\S]+?)\]\}/g,
interpolate : /\{\{([\s\S]+?)\}\}/g
};
app.TodoView = Backbone.View.extend({
//... is a list tag.
tagName: 'li',
template: Hogan.compile($('#item-template').html()),
// The DOM events specific to an item.
events: {
'click .toggle': 'toggleCompleted',
'dblclick label': 'edit',
'click .destroy': 'clear',
'keypress .edit': 'updateOnEnter',
'keydown .edit': 'revertOnEscape',
'blur .edit': 'close'
},
initialize: function () {
this.listenTo(this.model, 'change', this.render);
this.listenTo(this.model, 'destroy', this.remove);
this.listenTo(this.model, 'visible', this.toggleVisible);
},
render: function () {
if (this.model.changed.id !== undefined) {
return;
}
//_.each(myAlbum,function(album) {
// this.el.append(template.render(album.toJSON()));
//});
console.log(Hogan.compile($('#item-template').html()));
this.$el.html(this.template(this.model.toJSON()));
// Error in the above line
this.$el.toggleClass('completed', this.model.get('completed'));
this.toggleVisible();
this.$input = this.$('.edit');
return this;
},
toggleVisible: function () {
this.$el.toggleClass('hidden', this.isHidden());
},
isHidden: function () {
var isCompleted = this.model.get('completed');
return (// hidden cases only
(!isCompleted && app.TodoFilter === 'completed') ||
(isCompleted && app.TodoFilter === 'active')
);
},
toggleCompleted: function () {
this.model.toggle();
},
edit: function () {
this.$el.addClass('editing');
this.$input.focus();
},
close: function () {
var value = this.$input.val();
var trimmedValue = value.trim();
if (!this.$el.hasClass('editing')) {
return;
}
if (trimmedValue) {
this.model.save({ title: trimmedValue });
if (value !== trimmedValue) {
this.model.trigger('change');
}
} else {
this.clear();
}
this.$el.removeClass('editing');
},
updateOnEnter: function (e) {
if (e.which === ENTER_KEY) {
this.close();
}
},
revertOnEscape: function (e) {
if (e.which === ESC_KEY) {
this.$el.removeClass('editing');
}
},
clear: function () {
this.model.destroy();
}
});
})(jQuery);
This is my Html
<!doctype html>
<html lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>Backbone.js • TodoMVC</title>
<link rel="stylesheet" href="js/assets/base.css">
</head>
<body>
<section id="todoapp">
<header id="header">
<h1>todos</h1>
<input id="new-todo" placeholder="What needs to be done?" autofocus>
</header>
<section id="main">
<input id="toggle-all" type="checkbox">
<label for="toggle-all">Mark all as complete</label>
<ul id="todo-list"></ul>
</section>
<footer id="footer"></footer>
</section>
<div id="form-horizontal">
<p>Double-click to edit a todo</p>
<p>Written by <a href="https://github.com/addyosmani">Addy Osmani</a></p>
<p>Part of <a href="http://todomvc.com">TodoMVC</a></p>
</div>
<script type="text/template" id="item-template">
<div class="view">
<input class="toggle" type="checkbox" {{ completed ? 'checked' : '' }}>
<label>{{ title }}</label>
<button class="destroy"></button>
</div>
<input class="edit" value="{{ title }}">
</script>
<script type="text/template" id="stats-template">
<span id="todo-count"><strong>{{ remaining }}</strong> {{ remaining === 1 ? 'item' : 'items' }} left</span>
<ul id="filters">
<li>
<a class="selected" href="#/">All</a>
</li>
<li>
<a href="#/active">Active</a>
</li>
<li>
<a href="#/completed">Completed</a>
</li>
</ul>
{[ if (completed) { ]}
<button id="clear-completed">Clear completed ({{ completed }})</button>
{[ } ]}
</script>
<script src="js/lib/base.js"></script>
<script src="js/lib/hogan-2.0.0.js"></script>
<script src="js/lib/jquery.js"></script>
<script src="js/lib/underscore.js"></script>
<script src="js/lib/backbone.js"></script>
<script src="js/lib/backbone.localStorage.js"></script>
<script src="js/models/todo.js"></script>
<script src="js/collections/todos.js"></script>
<script src="js/views/todos.js"></script>
<script src="js/views/app.js"></script>
<script src="js/routers/router.js"></script>
<script src="js/app.js"></script>
</body>
</html>
That was awesome .. you made it great. But i have another js file to add a new todo. This also give error. Uncaught TypeError: Cannot call method 'toJSON' of undefined. i am very new to this please help me. My another js file:
var app = app || {};
(function ($) {
'use strict';
_.templateSettings = {
evaluate : /\{\[([\s\S]+?)\]\}/g,
interpolate : /\{\{([\s\S]+?)\}\}/g
};
// The Application
// ---------------
// Our overall **AppView** is the top-level piece of UI.
app.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($('#stats-template').html()),
statsTemplate:Hogan.compile($('#stats-template').html()),
// Delegated events for creating new items, and clearing completed ones.
events: {
'keypress #new-todo': 'createOnEnter',
'click #clear-completed': 'clearCompleted',
'click #toggle-all': 'toggleAllComplete'
},
// 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.allCheckbox = this.$('#toggle-all')[0];
this.$input = this.$('#new-todo');
this.$footer = this.$('#footer');
this.$main = this.$('#main');
this.$list = $('#todo-list');
this.listenTo(app.todos, 'add', this.addOne);
this.listenTo(app.todos, 'reset', this.addAll);
this.listenTo(app.todos, 'change:completed', this.filterOne);
this.listenTo(app.todos, 'filter', this.filterAll);
this.listenTo(app.todos, 'all', this.render);
// Suppresses 'add' events with {reset: true} and prevents the app view
// from being re-rendered for every model. Only renders when the 'reset'
// event is triggered at the end of the fetch.
app.todos.fetch({reset: true});
},
// Re-rendering the App just means refreshing the statistics -- the rest
// of the app doesn't change.
render: function () {
var completed = app.todos.completed().length;
var remaining = app.todos.remaining().length;
if (app.todos.length) {
this.$main.show();
this.$footer.show();
this.$el.html(this.template.render(this.model.toJSON()));
this.$footer.html(this.statsTemplate.render({
completed: completed,
remaining: remaining
}));
this.$('#filters li a')
.removeClass('selected')
.filter('[href="#/' + (app.TodoFilter || '') + '"]')
.addClass('selected');
} else {
this.$main.hide();
this.$footer.hide();
}
this.allCheckbox.checked = !remaining;
},
// 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 app.TodoView({ model: todo });
this.$list.append(view.render().el);
},
// Add all items in the **Todos** collection at once.
addAll: function () {
this.$list.html('');
app.todos.each(this.addOne, this);
},
filterOne: function (todo) {
todo.trigger('visible');
},
filterAll: function () {
app.todos.each(this.filterOne, this);
},
// Generate the attributes for a new Todo item.
newAttributes: function () {
return {
title: this.$input.val().trim(),
order: app.todos.nextOrder(),
completed: false
};
},
// If you hit return in the main input field, create new **Todo** model,
// persisting it to *localStorage*.
createOnEnter: function (e) {
if (e.which !== ENTER_KEY || !this.$input.val().trim()) {
return;
}
app.todos.create(this.newAttributes());
this.$input.val('');
},
// Clear all completed todo items, destroying their models.
clearCompleted: function () {
_.invoke(app.todos.completed(), 'destroy');
return false;
},
toggleAllComplete: function () {
var completed = this.allCheckbox.checked;
app.todos.each(function (todo) {
todo.save({
'completed': completed
});
});
}
});
})(jQuery);
You are using the compiled Hogan template incorrectly.
The result of Hogan.compile() is not a function, but an object. That's why you get the "... template ... is not a function" error. To render the compiled Hogan template, you need to call the "render" function of the object.
So in your case, you need to use
instead of
Visit http://twitter.github.io/hogan.js for more information.