CODEWITHSUNDEEP
jquerybackbone.js
Evan Emolo
Evan Emolo

Reputation: 1670

Backbone form submission error

I am new to Backbone, and I'm trying to get a form to submit from a tutorial.

I keep getting the following error:

Uncaught TypeError: Cannot call method 'add' of undefined

for the the line this.collection.add( book );

What do I need to correct?

JavaScript:

App.Views.AddBook = Backbone.View.extend({
    events: {
        'click #add': 'submit'
    },
    submit: function(e) {
        e.preventDefault();

        var formData = {};

        $('#addBook div').children('input').each(function(i, el) {
            if($(el).val() !== '') {
                formData[ el.id ] = $(el).val();
            }
        });

        var book = new App.Models.Book( formData );

        this.collection.add(book);
    }
});

var booksCollection = new App.Collections.Books([
    {
        title: 'JS: The Good Parts',
        author: 'Douglas Crockford',
        releaseDate: '2008'
    },
    {
        title: 'The Little Book on CoffeeScript',
        author: 'Alex MacCaw',
        releaseDate: '2012'
    }
]);

var addBook = new App.Views.AddBook({ el: $('#addBook') });

HTML:

<form id="addBook" action="#">
    <div>
        <label for="title">Title: </label><input id="title" type="text" />
        <label for="author">Author: </label><input id="author" type="text" />
        <label for="releaseDate">Release date: </label><input id="releaseDate" type="text" />
        <br>
        <button class="btn" id="add">Add</button>
    </div>
</form>

Upvotes: 0

Views: 82

Answers (1)

Bojangles
Bojangles

Reputation: 101513

You need to pass in your booksCollection to your view, like this:

var addBook = new App.Views.AddBook({ 
    collection: booksCollection,
    el: $('#addBook') 
});

If you don't, this.collection in the view context won't be defined which is why you're getting that error. The collection parameter in the view's initialisation is special in that Backbone will assign it to this.collection inside the view.

Upvotes: 3

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