How do you create a lightning message channel?

How do you create a lightning message channel?

The MessageContext object provides information about the Lightning web component that is using the Lightning message service. To import a message channel, use the scoped module @salesforce/messageChannel . To create a message channel in an org, use the LightningMessageChannel metadata type.

What is lightning messaging service?

Introduced in the Winter ’20 release by Salesforce, Lightning Message Service is the out-of-the-box functionality that empowers you to communicate between Visualforce and Lightning Components, including Aura web components (AWC) and Lightning web components (LWC).

How do I create a lightning message channel in Salesforce?

To create a lightning:messageChannel component in your org, use the LightningMessageChannel metadata type and append it with __c . The message channel isn’t a custom object, it just uses the same suffix.

What is lightning message in Salesforce?

Lightning Message Service is a unique Salesforce feature that enables communication between Visualforce, Aura, and Lightning Web Components on the same Lightning Page.

Where can we publish to subscribe from a message in LMS?

LMS API allow you to publish message throughout the lightning experience and subscribe the same message anywhere with in lightning page. It is similar to Aura Application Events to communication happens between components.

How do you toast message in lightning component?

Let’s test our component.

1. Click on “Information” button and see “Information Toast”
2. Click on “Error” button and see “Error Toast”
3. Click on “Warning” button and see “Warning Toast”
4. Click on “Success” button and see “Success Toast”

How do you handle errors in lightning component?

Request the Apex controller using a server-side action. The controller processes the requests and all the regular Apex exceptions are applicable. After the transaction, Apex controller sends a response to the Lightning component controller or helper which are on client-side.

How do you use lightning data service?

Actions

1. Creating a Record. To create a record using Lightning Data Service, declare force:recordData without assigning a recordId attribute value.
2. Loading a Record (in APEX language SOQL the record using Id)
3. Saving a Record (in APEX language UPSERT)
4. Deleting a Record (in APEX language Delete)
5. Change Event Handler.

What do you need to know about lightning messagechannel?

This component allows you to subscribe and publish messages via the Lightning Message Service. lightning:messageChannel must be an immediate child of the aura:component tag of its parent. lightning:messageChannel provides access to the Lightning Message Service API.

How to access the Lightning Message Service API?

We need to use Lightning Message Channel to access the Lightning Message Service API. In LWC we can access Lightning Message Channel with the scoped module @salesforce/messageChannel . In Visualforce, we can use global variable $MessageChannel .

When to use multiple lightning messagefield tags?

Use multiple lightningMessageField tags if you need more than one field in the event payload. The isExposed tags allow the channel to be used across namespaces. Once the message channel file is complete, deploy it to your org. Now, you are ready to make use of the message channel.

When does Lightning Message Service come out in Salesforce?

In Winter 20 Salesforce Introduce the new feature Lightning Message Service and it is generally available in Summer 20. Lightning Message Service (LMS) allow you to communicate between Visualforce and Lightning Components (Aura and LWC both) on any Lightning page.