How to use event handler in Lightning tab?

How to use event handler in Lightning tab?

The lightning:tab component enables you to obtain a reference to the target component when it becomes active using the onactive handler. Clicking the component multiple times invokes the handler once only. Some components provide event handlers to pass in events to child components, such as the onselect event handler on the following components.

How to handle event in base Lightning component?

For events fired by standard HTML elements, you can use event.currentTarget and event.target. For events fired by base Lightning components, use event.getSource () instead.

How to get the name of an event in Lightning?

event.getSource () helps you determine which component fired an event. Let’s say you have several buttons that reuse the same onclick handler. To retrieve the name of the button that fired the event, use event.getSource ().get (“v.name”).

How to handle event in Lightning aura component?

In your client-side controller, use the event handler to get the textvalue attribute value. Alternatively, to retrieve the component that fired the event, use event.getSource (). //DOM elements. For events fired by standard HTML elements, you can use event.currentTarget and event.target.

Why do I get null pointer in Lightning component?

Search for an answer or ask a question of the zone or Customer Support. Need help? Dismiss Don’t have an account? Don’t have an account? In the “Input Data Using Forms”, I am getting NULL pointer error when I call “campingListItem” LIghtning component and I can’t seem to figure out why.

How does data binding between components work in Lightning?

The data binding between components for property values is one-way. To communicate down from a parent component to a child component, set a property or call a method on the child component. To communicate up from a child component to a parent component, send an event.

How to handle events in Salesforce Lightning Component Library?

A click listener on always receives my-button as the target, even if the click happened on the button element. Imagine an event is dispatched from a div element in the c-todo-item component. Within the component’s shadow DOM, Event. target is div.

How to create a Notifier component in Lightning aura?

A user clicks a button in the notifier component, ceNotifier.cmp. The client-side controller for ceNotifier.cmp sets a message in a component event and fires the event. The handler component, ceHandler.cmp, contains the notifier component, and handles the fired event.