Learn how to handle errors effectively in Salesforce Lightning Components using the aura:handler tag and custom error components. Provide meaningful error messages to users for a better experience.
Table of Contents
Question
A user receives the generic “An internal server error has occurred” while interacting with a custom Lightning Component.
What should the developer do to ensure a more meaningful message?
A. Add an onerror event handler to the tag.
B. Add an error-view component to the markup.
C. Use an AuraHandledException in a try/catch block.
D. Use ProcessBuilder to catch the error.
Answer
A. Add an onerror event handler to the tag.
Explanation
The best approach to ensure a more meaningful error message is displayed to the user when an internal server error occurs in a custom Lightning Component is to add an onerror event handler to the aura:component tag (Option A).
By adding an onerror event handler, you can catch and handle errors that occur within the component. This allows you to customize the error message displayed to the user, providing more specific and meaningful information about the error.
Here’s an example of how to add an onerror event handler to a Lightning Component:
<aura:component>
<aura:handler event="aura:systemError" action="{!c.handleError}"/>
<!-- Component markup -->
</aura:component>
In the JavaScript controller, you can define the handleError function to process the error and display a custom error message:
handleError: function(component, event, helper) {
var error = event.getParam("error");
console.log(error.message);
// Display a custom error message to the user
helper.showToast("Error", error.message, "error");
}
Using an AuraHandledException in a try/catch block (Option C) is useful for handling expected exceptions within the component’s server-side controller, but it doesn’t directly address the generic “An internal server error has occurred” message.
Adding an error-view component (Option B) is not a standard approach in Lightning Components, and using ProcessBuilder (Option D) is not directly related to handling errors in Lightning Components.
By implementing an onerror event handler, you can provide a better user experience by displaying meaningful error messages when internal server errors occur in your custom Lightning Components.
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