How do you handle event in Aura component?

Use in the markup of the handler component. The event attribute specifies the event being handled. The format is namespace : eventName . The action attribute of sets the client-side controller action to handle the event.

How do you fire a application event in lightning component?

Fire an Event The syntax to get an instance of an application event is different than the syntax to get a component event, which is cmp. getEvent(” evtName “) . Use fire() to fire the event.

How do you fire an event in Aura component?

1. Click File | New | select Lightning Event.
2. Name it as desired like cmpEvent just as the one I’m using in this post.
3. Click Submit button. It will give you a default code –
4. Use type=”COMPONENT” and change the self-closing tag to open and close tags like the one below.

How do you call an event in lightning component?

Component Event in Lightning Component | Lightning Component Communication With EVENT | aura:event

1. 1) Create Event Component.
2. 2) Register the Event ( in Child Component )
3. 3) Fire the Event ( from Child Component)
4. 4) Handle the Event (In Parent Event)
5. Here is Code For you.

What is application event in lightning?

An application event is fired from an instance of a component. All components that provide a handler for the event are notified. Application Event Propagation. The framework supports capture , bubble , and default phases for the propagation of application events.

What are events in Aura components?

In the Aura Components programming model, events are fired from JavaScript controller actions. Events can contain attributes that can be set before the event is fired and read when the event is handled. Events are declared by the aura:event tag in a .

How do you register fire and handle a component and application event?

Here are the steps:

1. Step 1: Create the event with the event type as Application.
2. Step 2: Register the event in the sender component A and fire the event using the below code.
3. Event_Name – File name of the event created in Step 1.
4. Step 3: Now handle the fired event inside receiver B as shown below.

What are the two best practices when it comes to component and application event handling?

Events Best Practices

• Use Component Events Whenever Possible. Always try to use a component event instead of an application event, if possible.
• Separate Low-Level Events from Business Logic Events.
• Dynamic Actions Based on Component State.
• Using a Dispatcher Component to Listen and Relay Events.

Why do we prefer component event over application event?

Component events can only be handled by components above them in the containment hierarchy so their usage is more localized to the components that need to know about them. Application events are best used for something that should be handled at the application level, such as navigating to a specific record.

Which application events are handled by?

Application Events are handled by any component have handler defined for event. These events are essentially a traditional publish-subscribe model. Application Event Example: In below example by using Application event, I’m passing the values from Component1 to a Component2 via event.

What is the difference between application level events and component level events in lightning?

Do we need to register application event?

Application Event: – Whenever our component are not connected to each other and in that case we wanted to communicate between the components then we go for application event. We do not need to register the application event, handler is need to handle the application event.