backbone.jsHow can I use the Backbone.js keyup event to detect user input?

Backbone.js provides a keyup event for detecting user input. To use it, you must first create a View object. Then, you can bind the keyup event to a callback function. The callback function will be triggered whenever the user presses a key.

For example, the following code will log a message to the console when the user presses a key:

var MyView = Backbone.View.extend({
  el: '#my-view',

  events: {
    'keyup': 'onKeyup'
  },

  onKeyup: function() {
    console.log('User pressed a key!');
  }
});

var myView = new MyView();

The code above consists of the following parts:

1. The MyView View object is created by extending the Backbone.View object.
2. The el property is set to #my-view. This will be the element that the keyup event is bound to.
3. The events property is set to an object that maps the keyup event to the onKeyup callback function.
4. The onKeyup callback function is defined, which logs a message to the console when the user presses a key.
5. The MyView View object is instantiated.

Whenever the user presses a key while the element with the ID my-view is focused, the message User pressed a key! will be logged to the console.

Helpful links

• Backbone.View
• Backbone.View Events

Edit this code on GitHub