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How to wire APEX methods to lightning Web Components?
The component’s JavaScript code imports the Apex method and invokes it via the wire service. The wire service provisions the results to the wiredContacts() function via an object with either an error or data property. If the wire service provisions data, it’s assigned to this. contacts, which is used in the template.
What is the second wire parameter in Lightning?
The second @wire parameter is an object that contains the parameters to pass to the Apex method. So, for example, even though findContacts takes a string, we don’t pass a string as the second @wire parameter. Instead, we pass an object that contains a property whose value is a string: { searchKey: ‘$searchKey’ }.
When to use wire service instead of JavaScript?
Delegating control is great for read operations, but it isn’t great for create, update, and delete operations. As a developer, you want complete control over operations that change data. That’s why you perform create, update, and delete operations with a JavaScript API instead of with the wire service.
What happens when a function is decorated with @ wire?
If a function is decorated with @wire, the results are returned in an object with a data property and an error property. Note The data property and the error property are hardcoded values in the API. You must use these values. Example To follow along with some code samples, see the lwc-recipes repo.
How to wire a component in Salesforce Lightning?
The @wire syntax is the same for any Apex method, but this example shows a pattern for building and passing an object. The component has three input fields that take a string, a number, and a number of list items that the component uses to generate a list. The Apex method simply concatenates and returns a string based on the values.
How to overload APEX methods in Salesforce Lightning?
Don’t overload @AuraEnabled Apex methods. Important apexMethodParams is an object. To pass parameter values to an Apex method, pass an object whose properties match the parameters of the Apex method. For example, if the Apex method takes a string parameter, don’t pass a string directly.
How to wire a component to the APEX method?
Important To @wire the component to the Apex method, the first parameter is a string, which is the name of the Apex method—in this case, findContacts. The second @wire parameter is an object that contains the parameters to pass to the Apex method.