Lightning Events

Lightning Events:

• Component Events
• Application Events

Component Events:

    The way of communication between the same component or the component in the hierarchy.

    The sequence of component event propagation:

• Event fired
• Capture phase - the event is navigated from root component to source(Component that fired the event)
• Bubble phase - the event is navigated from the source component to the root container.
• The event can be stopped at any component by calling stopPropogation().

Application Events:

    The way of communication between the same component or the component in the hierarchy in a traditional publish-subscribe model. All components that provide a handler for the event are notified.

    The sequence of Application event propagation:

• Event fired
• Capture phase - the event is navigated from root component to source(Component that fired the event)
• Bubble phase - the event is navigated from the source component to the root container.
• The event can be stopped at any component by calling stopPropogation().

event.getSource() helps you determine which component fired an event. Same can be achieved by event.target for DOM elements

ex: event.getSource().get("v.name")

ex: var el = event.target;

event.getParam("value") helps getting the parameter values passed in the event