Hi,

I would like to be able to mention users with @mention in my custom feed quick action 

I have created a lightning quick action called "Coworking Comm" on case feed so Company users can communicate internally on cases of certain type that we call "coworking cases".

And I would like for any user to tag or mention another user. Similar to the post feed as shown below:

Thank you

I would like to replicate the same thing with @mention in "coworking comm" quick action.



here is are my codes:

<--- .cmp: --->
<aura:component controller="CoworkingComm" implements="flexipage:availableForRecordHome,force:hasRecordId,force:lightningQuickAction" access="global" >
    
    <aura:attribute name="recordId" type="Id" />
    <aura:attribute name="textPost" type="String" />
    <aura:attribute name="thisCase" type="Case" default="{ 'sobjectType': 'Case' }"/> 
    <aura:handler name="init" value="{!this}" action="{!c.doInit}" />
    
    <div class="coworking_comm">
            <lightning:inputRichText variant="bottom-toolbar" value="{!v.textPost}" formats="['bold','italic','underline','strike','list','clean']" shareWithEntityId="{!v.recordId}">
                <lightning:insertImageButton />             
            </lightning:inputRichText>            
        </div>
    <div class="coworking_comm"><lightning:button label="Share" onclick="{!c.shareComm }"/></div>
    
 </aura:component>

<--- controller.js: --->
({
    doInit: function(cmp) {
             
        cmp.set('v.textPost', '<p><script>alert(this)</script></p><p>hi!</p>');
        
    },
    
    shareComm : function (component, event, helper) {
        var action = component.get("c.ctrlShareComm");
            action.setParams({
                caseid: component.get("v.recordId"),
                textPost: component.get("v.textPost")
                
            });
            
             //force refresh of the page
                action.setCallback(this, function(data) {
                var result = data.getReturnValue();
                $A.get('e.force:refreshView').fire();
                
            });
         //Queue the action
            $A.enqueueAction(action);
        
    },
    
});

<--- controller.apxc: --->
public with sharing class CoworkingComm {
@AuraEnabled
    public static Case getCase(string caseid){
        Case c = [SELECT Id,Status,Owner.Type,First_Reply_Date__c FROM Case WHERE Id=:caseid LIMIT 1];
        return c;
    }
    @AuraEnabled
    public static string ctrlShareComm (String caseid, String textPost)
    {
        string result = 'success';        
              
        // REMOVE BR FROM TEXTPOST
        textPost = textPost.replaceAll('<br>','<p>&nbsp;</p>');
        textPost = textPost.replaceAll('strike>','s>');
        
        // CREATE FEED ITEM AND POST IT
        FeedItem post = new FeedItem();
        post.ParentId = caseid;
        post.IsRichText = true;
        post.type = 'LinkPost'; 
        post.Body = textPost;
        post.Visibility = 'InternalUsers';
                              
        try{
            insert post;
            //ConnectApi.FeedElement feedElement = ConnectApi.ChatterFeeds.postFeedElement('InternalUsers',caseid,ConnectApi.FeedElementType.FeedItem,textPost);
        }
        catch(Exception e)
        {
            System.debug('CoworkingCommunicationController - Error inserting post');
            return 'post_error';
        }
        return 'case_error';
    }
}