Questions tagged [lightning-message-service]

Questions related to the Lightning message service when communicating across DOM between Visualforce pages, Aura components, and Lightning web components, including components in a pop-out utility bar.

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12 views

Is there a way to know the Publisher details in Lightning Message Channel?

I have 5 lightning web componet on my flex page. One of the components like to maintain the list of components and run some business logic on one of the events? I know I can send the component name or ...
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28 views

Is it possible to use LMS in Screen Flows?

I wanted to ask whether there is a possibility to use LMS - Lightning Message Service on Screen Flows in order to enable communication between its components.
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40 views

Lightning Message Service doesn't work between community pages

I have two Lightning Web Components. One is on Community Page #1, the other is on Community Page #2. The first LWC creates a record and then navigates to the second Community page. I need to send ...
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42 views

Can I have multiple instances of the same component using a Lightning Message Service channel?

If I create an lwc app component that uses an LMS message channel, will I run into problems if I have multiple instances of that app in a record page? By problems, I mean all instances of the ...
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66 views

Lightning Message Service is not working

I have implemented the LMS(Lightning Message Service) concept in my project because I have to pass some parameter values from LWC component to Aura component. the problem is my LWC component is not ...
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1answer
140 views

Should Lightning Message Service (LMS) work from a Lightning Web Component Action?

I've just moved some logic from one LWC into a "headless" @api invoke() LWC that is configured as an Action that appears as a button in the standard "Highlights Panel" LWC. The ...
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1answer
23 views

Use message channel in both direction

I am using message channel to communicate between 2 lwc and both lwc must send and retrieve data. So i am passing value to subscriber and after that to publisher. How can i do it? Do i need to create ...
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1answer
27 views

LMS send multiple message to one component

I need to send multiple message into one component via Lightning message system using one message channel.Is it possible or i must use multiple message channel? I tried to google, but didn't found ...
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1answer
90 views

Can I use wire adapter in classes that do not inherit from LightningElement?

Is it possible to use @wire in classes that do not inherit from LightningElement? Example: export default class A { @wire messageContext; } What I want to achieve: I want to create a ...
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1answer
266 views

Is a headless daemon LWC a good pattern?

I want to write an LWC that listens for a small set of LMS messages, performs database operations sometimes and sometimes forwards new LMS messages for the benefit of another LWC that may or may not ...
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1answer
80 views

How to check if LWC component is available for Lightning out

I have several components which have complex logic (Platforn events , Message service) How to check if LWC component/module is available for Lightning out and will work there ? Any help will be ...
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63 views

Suscribe to LMS published from an LWC in other package namespace

In a Managed Package, am publishing a message using a Lightning Message Channel in a Lightning Web Component. I want to be able to suscribe to this Lightning Message Channel from a Lightning Web ...
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232 views

Best practises with Lightning Message Service

As an ISV, I need to establish communication between LWC and Visualforce page. I am planning to leverage LMS and I have 2 questions: Which are the best practices regarding Lightning Message Channels? ...
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1answer
174 views

'sforce is not defined' on Visualforce page when trying to publish with LMS

I'm trying to use the lightning message service on a visualforce page. To simplify things, I'm using the exact code supplied by Salesforce with the one exception I've updated the SAMPLEMC variable to ...
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2answers
103 views

Is lightning message channel package-able

I have used the lightning message channel in LWC and I want to package the same. But lightning message channel is not available in the list. Also, the component available in the managed pacakge ...
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1answer
648 views

How to Pass the Data from One LWC to Another LWC during Navigation when using Lightning Messaging Service

Requirement: I want to pass the data from One LWC to another LWC. Both LWC are not on the same page but added in Different Tab. So, when I pass the Data from LWC lmsNavComA, I should expect to see the ...
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1answer
79 views

What are the risks of using LMS on an Experience Cloud Site, and is it on the Roadmap to be GA?

Currently I have a few components that use the Lightning Message Service, but I realize that this feature is in beta for Experience Builder sites. As of right now, my components seem to work as ...
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40 views

Send message from aura component to JS app onInit

I embedded a JS application into my aura component. I would like to send a message containing a product info from aura component to my JS app <aura:component controller="Controller" ...
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1answer
256 views

Publish/Subscribe Message Service VS Parent to Child LWC

Quick theoritical question. I've read about the lightning message service communication between Lightning Web Components and it was specified that this type of communication is between unrelated ...
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1answer
1k views

LightningMessageChannel error

I'm trying to do some trainning for LWC using LMS, but when I push my source I get below error org.auraframework.throwable.AuraRuntimeException: Unable to retrieve metadata for descriptor: markup://c:...
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1answer
702 views

Communication between two child LWC Components

What is the best way to realize bi-directional communication between two LWC components. Is it better approach to pass values throught parent component or use Lightning message service? Dispatch ...
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37 views

Events between components not on the same system

As the question goes, what can I use to communicate between 2 LWC components which are accessed by different users? I am trying to build a Sprint planning poker app in LWC, where the vote submitted by ...
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1answer
328 views

Communicate across tabs in LWC using Message service

I am trying to send info across components which are not on the same lightning page. They are on different tabs of the App. When the components are placed on the same page, Lightining message service ...
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0answers
307 views

Odd Error Returned When Using Lightning Message Service in LWC - WindowMessengerNoConnectionError

This is my first time using Lightning Message Service. I set it up following the directions on this standard documentation page. After setting this up I am able to communicate between two lightning ...
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1answer
32 views

Alert on account page for a new note being added

I want to be able to create an alert that is displayed on the account page whenever a new note is added. I've seen the Lightning Message Utility managed component in appexchange (https://appexchange....
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1answer
240 views

sforce.one not available in VF page used as CTI adapter

We are using a VF page as a CTI adapter. It does not seem to include sforce.one. I notice on other VF pages this is brought in as part of api.js, but I cannot put my finger on what it is about that VF ...
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11 views

Why define lightningMessageFields in Lightning Message Service? [duplicate]

I am wondering something. In the XML file of a lightning message channel I can specify lightningMessageFields or I can omit this. Either way messages on the channel function correctly whatever you put ...
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1answer
146 views

What is the real use of "lightningMessageFields" while using LightningMessageChannel

I was thinking - while publishing or subscribing to a LightningMessageChannel, the payload has to be in some way match exactly to the names or fields defined in the lightningMessageFields XML ...
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387 views

LMS throwing :sorry to interrupt error[invalid message context]

I am trying to publish a message form lWC , but getting error as below: lightning/messageService: invalid message context] i have created the message channel file added it in the package.xml and ...
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58 views

Sending message from AURA to LWC

I have a requirement to send messages from Aura component to an LWC component. The component exist on the The Aura Component contain an LWC inside it,, i need if the tab of Aura is open the i need to ...
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1answer
288 views

Lightning Messaging Service: sforce.one not defined

I am using Lightning message service to pass message from VF page to LWC. VF page is in iframe and I am using this method to publish message sforce.one.publish(CHANNEL, message); However I am getting ...
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901 views

LWC LMS: Invalid message context error

I ask this question because I did not find any similar. My error is "invalid message context". I will explain it graphically. From tab 1, I create a record, with a navigation mixin, I am ...
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0answers
85 views

Including Lightning Message Service in Managed Package?

I am attempting to make use of the Lightning Message Service to pass events between components when various actions occur (e.g. Sending an email, or authenticating the app. The Salesforce docs suggest ...
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1answer
706 views

Lightning messaging service communities support for guest users

We are working towards building a community where we have the need to communicate with different parts of the page built with LWC and Aura. Since salesforce launched lightning messaging service we ...
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0answers
174 views

Trying to publish Lightning Message Channel from Visualforce page and getting error `Sfdc is not defined`

I am trying to publish a message from a visualforce page into a lightning component and my visualforce page is not able to publish. My Visualforce code : <apex:page applyBodyTag="false" ...
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2answers
445 views

Not able to use LMS in VF page iframe in Aura Component

I want to use LMS to publish data from the VF page and receive it in Aura Component. I have an Aura Component and am trying to iframe a Visualforce page in it. <aura:component> <iframe src='/...
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142 views

Receiving error "Cannot convert a Symbol value to a string" at @wire (MessageContext)

I am getting an error while publishing message from one web Component: [error = TypeError: Cannot convert a Symbol value to a string at], it occurs while receiving MessageContext using @wire(...
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1answer
230 views

ways to create LightningMessageChannel in Salesforce

I know we can create LightningMessageChannel using package.xml but is there any quick way to create it? Any UI alternative would be far better than package.xml route.
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1answer
318 views

Visualforce to Visualforce Lightning Component Communication - postMessage not received

I have two visualforce page lightning components on a lightning page. I am unable to get them to communicate, there are no logs to the console and no errors to report. The posted messages are not ...
2
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0answers
456 views

Lightning Message service error in visualforce page - Cannot read property 'subscribe' of undefined

Was anybody able to work with sforce.one.subscribe for subscribing to lightning message service in visualforce? I keep getting below error: Even after including sforce and ajax js files, sforce.one ...
2
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1answer
482 views

Lightning message service(Build a Bear-Tracking App with Lightning Web Components)

When I am making a bear tracking app this problem arises in the last module. Error - afterRender threw an error in 'c:bearMap' [lightning/messageService: The scope property is required. When you call ...
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1answer
340 views

In Aura Components, is it possible to subscribe and unsubscribe to message channels?

Currently I'm playing around with the Lightning Message Service. I've noticed tha online tutorials for using LMS with both VisualForce and Lightning Web Components demonstrate publish, subscribe, and ...
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1answer
212 views

How to use LMS & EMP-API in the same LWC component

As both empApi and LMS require the import of the subscribe and unsubscribe methods. How can you use both within the same component? import { subscribe, unsubscribe} from 'lightning/empApi'; import { ...
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1answer
127 views

Listening to LMS messages from a background utility bar item

I want to do some background processing so I wrote a background utility bar item, and tried listening to LMS messages, but it didn't work. Then I found this: It is a front-end service that works in ...
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1answer
202 views

Lightning Message Services (beta) - no response

I tried playing around with Lightning Message Services as per the release note. Created a LWC to publish message on the message channel, and a VF page to listen to it. Also the other way around. I am ...
4
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1answer
1k views

Send message to aura components from lwc

I have a requirement to send messages from LWC component to an Aura component. The component exist on the page independently, i.e LWC is not embedded in an aura component. The components are in a ...