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:
- The
MyView
View object is created by extending theBackbone.View
object. - The
el
property is set to#my-view
. This will be the element that thekeyup
event is bound to. - The
events
property is set to an object that maps thekeyup
event to theonKeyup
callback function. - The
onKeyup
callback function is defined, which logs a message to the console when the user presses a key. - 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
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