Executing form validation upon submission of a form from the view in BackboneJS

Recently, I delved into using Backbone.js to organize my JavaScript code and create modular applications. However, I encountered a snag when dealing with events.

My goal is to develop a simple View that can handle forms and validate them. Eventually, I plan to integrate additional JavaScript functionality like live validation and hover effects.

Here is the basic code snippet I currently have:

var Form = Backbone.View.extend({
    attributes: {
        att1 = 'att1',
        att2 = 'att2'
    },
    events: {
        'submit': 'validateFields'
    },
    initialize: function(element) {
        this.el = $(element);
    },
    validateFields: function() {
        alert(this.attributes.att1); //do something
        return false;
    }
});

var f = new Form('#formid');

The issue I encountered is that the validateFields function is not triggered when I submit the form. I attempted to bind the event in the constructor as follows:

this.el.bind('submit', this.validateFields);

Although the above code works, the "this" within the validateFields function refers to the $('#formid') object rather than my Form object.

Answer №1

In Backbone, the events are bound to the callbacks in the events hash using jQuery's delegate method.

A known issue is that the delegate method does not properly handle the submit event in IE. The comment in the Backbone source points this out.

A simple solution is to include the following line in your render method:

render: function() {
  //render the view
  $(this.el).submit(this.validateFields);
}

Don't forget to bind the context for validateFields in the initialize method as well:

initialize: function() {
  _.bindAll(this, 'render', 'validateFields');
}

Answer №2

Consider adjusting how you define your el:

var form = new Form({el: '#formid'});

You may also update or remove the initialize method as needed:

var Form = Backbone.View.extend({
    // ...
    initialize: function() {
        // Some code
    },
    // ...
});

Regarding the code snippet

this.el.bind('submit', this.validateFields);
, if you wish to maintain the context of the Form object, you should utilize binding methods:

this.el.bind('submit', _.bind(this.validateFields, this)); // using Underscore method
this.el.bind('submit', $.proxy(this.validateFields, this)); // using jQuery method

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