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How method should be defined in Apex class to be used in lightning component?
Lightning web components can import methods from Apex classes into the JavaScript classes. Once after importing the apex class method you can able call the apex methods as functions into the component by calling either via the wire service or imperatively. The Apex Method should be marked with @AuraEnabled.
How do you call a method in lightning component?
Use to define a method as part of a component’s API. This enables you to directly call a method in a component’s client-side controller instead of firing and handling a component event.
How do you add errors to lightning component?
We have to return an error message for an apex controller method of which the return type is anything other than string (e.g., an apex method that returns a list of sObject). To show custom error messages in Lightning: Return the custom error messages from apex method. Show the error messages in the Component.
How does an apex controller respond to a lightning request?
Exchanges between the two sides follow a common request-response pattern. A Lightning component sends a request to its Apex controller using a server-side action. The controller processes the request. This can trigger a server-side error (permission issue, invalid query). The controller sends a response to the Lightning component.
How to define apex class in component controller?
To perform this tasks, we need to define apex class in component controller like defined in below code.
How to call client side method in Lightning component?
To call the server side method we need to create the instance of server side method in client side controller. 1). setParams () : To set the parameter of server side controller method. 2). setCallback (this, function (response) {}) : To perform the tasks when we get the response of server side controller method.
What happens when lightning receives an unexpected response?
The controller sends a response to the Lightning component. The Lightning component processes the response in a callback function. This can trigger a client-side error (unexpected response).