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@lwc/wire-service
Advanced tools
This code is the implementation of the Lightning Web Component wire service. The wire service enables declarative binding of data providers called wire adapters to a Lightning web component using the @wire
decorator. It fulfills the goals of the data service proposal.
Wire adapters simply provide data. A wire adapter doesn't know anything about the components that it provides data to.
In a component, declare its data needs by using the @wire
decorator to connect (or wire) it to a wire adapter. In this example, the component is wired to the getBook
wire adapter. This declarative technique makes component code easy to read and reason about.
// bookItem.js
import { LightningElement } from 'lwc';
export default class WireExample extends {
@api bookId;
@wire(getBook, { id: '$bookId'})
book;
}
Wire adapters are part of LWC's reactivity system. An @wire
takes the name of a wire adapter and an optional configuration object, which is specific to the wire adapter. You can use a $
to mark the property of a configuration object as reactive. When a reactive property’s value changes, the wire adapter's update
method executes with the new value. When the wire adapter provisions new data, the component rerenders if necessary.
// wire-adapter.js
import { bookEndpoint } from './server';
export class getBook {
connected = false;
bookId;
constructor(dataCallback) {
this.dataCallback = dataCallback;
}
connect() {
this.connected = true;
this.provideBookWithId(this.bookId);
}
disconnect() {
this.connected = false;
}
update(config) {
if (this.bookId !== config.id) {
this.bookId = config.id;
this.provideBookWithId(this.bookId);
}
}
providBookWithId(id) {
if (this.connected && this.bookId !== undefined) {
const book = bookEndpoint.getById(id);
if (book) {
this.dataCallback(Object.assign({}, book));
} else {
this.dataCallback(null);
}
}
}
}
For complete information about syntax, see lwc.dev/guide/wire_adapter.
The RCast App is a PWA podcast player written with Lightning Web Components.
FAQs
@wire service
We found that @lwc/wire-service demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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