Lightning Components Developer Guide

What is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Communicating with Events
Creating Apps
App Overview
Designing App UI
Creating App Templates
Developing Secure Code
Styling Apps
Using JavaScript
JavaScript Cookbook
Dynamically Creating Components
Detecting Data Changes
Finding Components by ID
Dynamically Adding Event Handlers
Dynamically Showing or Hiding Markup
Adding and Removing Styles
Which Button Was Pressed?
Using Apex
Controlling Access
Using Object-Oriented Development
Caching with Storage Service
Using the AppCache
Distributing Applications and Components
Debugging
Reference
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Dynamically Adding Event Handlers

You can dynamically add a handler for an event that a component fires. The component can be created dynamically on the client-side or fetched from the server at runtime.

This sample code adds an event handler to instances of c:sampleComponent.

You can also add an event handler to a component that is created dynamically in the callback function of $A.createComponent(). For more information, see Dynamically Creating Components.

addHandler() adds an event handler to a component.

Note that you can’t force a component to start firing events that it doesn't fire. c.someAction can be an action in a controller in the component's hierarchy. someAction and cmp refers to the event name and value provider respectively. someAction must match the name attribute value in the aura:registerEvent or aura:handler tag. Refer to the JavaScript API reference for a full list of methods and arguments.