Salesforce: Call Apex From Lightning Web Components (LWC)
Summary
The content explains two primary ways to call Apex methods from Lightning Web Components: using the @wire decorator for automatic, read-only data retrieval with caching, and calling Apex imperatively for more controlled, on-demand interactions such as button clicks. It demonstrates these methods with practical examples fetching Account records, showing how to handle data and errors in both approaches, and how to expose and deploy LWCs on Lightning pages. Understanding these patterns allows Salesforce developers to choose the right technique for various business needs and ensures efficient integration between frontend components and backend logic.
Takeaways
- Use @wire decorator for automatic, cacheable, read-only Apex calls in LWCs.
- Invoke Apex imperatively for manual control and on-demand data fetching.
- Annotate Apex methods with @AuraEnabled(cacheable=true) for wire compatibility.
- Define LWC columns for lightning-datatable to display fetched records properly.
- Expose LWCs in XML metadata to add components to Lightning pages.
In Salesforce LWC (Lightning Web Component), we need to call Apex to access and manipulate data on the Salesforce backend, performing complex business logic operations that cannot be handled solely within the LWC. To call an Apex method from LWC in Salesforce, we can use the wire property or the wire function, or call it imperatively. In this Salesforce tutorial, we will learn how to call Apex from Lightning Web Components (LWC) using the wire and imperative methods. Call Apex From Lightning Web Components (LWC) Below, I will explain how to call an Apex class and its methods from Lightning web components to access their functionality. Call Apex Using @wire Decorator in LWC In the steps below, we will call an Apex method from Lightning Web Components (LWC) using the @wire function. First, we will create an Apex class that contains the method that we will call from LWC. The class method must be static, either global or public, and annotated with @AuraEnabled.