September 22, 2021

Queue Assignment using Lightning Web Component in Salesforce with lightning-dual-listbox or multipicklist

Sample code:
Apex Class:
public class QueueAssignmentController {

    @AuraEnabled( cacheable=true )
    public static QueueWrapper fetchQueueAssignments() {
    
        QueueWrapper objQW = new QueueWrapper();
        Set < String > setAssignedQueueIds = new Set < String >();
        List < QueueOptionWrapper > allGroups = new List < QueueOptionWrapper >();
        
        for ( GroupMember objGM : [ SELECT Id, Group.Name, GroupId FROM GroupMember WHERE UserOrGroupId =: UserInfo.getUserId() AND Group.Type = 'Queue' ] ) {
        
            setAssignedQueueIds.add( objGM.GroupId );
            QueueOptionWrapper objQOW = new QueueOptionWrapper();
            objQOW.label = objGM.Group.Name;
            objQOW.value = objGM.GroupId;
            allGroups.add( objQOW );
        
        }
        
        for ( Group objGroup : [ SELECT Id, Name FROM Group WHERE Type = 'Queue' AND Id NOT IN:setAssignedQueueIds  ] ) {
        
            QueueOptionWrapper objQOW = new QueueOptionWrapper();
            objQOW.label = objGroup.Name;
            objQOW.value = objGroup.Id;
            allGroups.add( objQOW );
        
        }
        
        objQW.availableQueues = allGroups;
        objQW.selectedQueues = new List < String >();
        
        if ( setAssignedQueueIds.size() > 0 )
            objQW.selectedQueues.addAll( setAssignedQueueIds );
        
        return objQW;
    
    }
    
    @AuraEnabled
    public static String addRemoveQueues( List < String > selectedQueues, List < String > updatedQueues ) {
    
        String strUserId = UserInfo.getUserId();
        List < GroupMember > listGroupMembersForInsert = new List < GroupMember >();
        Set < String > setGroupIds = new Set < String >();
    
        try {
        
            Set < String > setSelectedQueues = new Set < String >();
            Set < String > setUpdatedQueues = new Set < String >();
            setSelectedQueues.addAll( selectedQueues );
            setUpdatedQueues.addAll( updatedQueues );
            
            for ( String strQueue : setUpdatedQueues ) {
            
                if ( !setSelectedQueues.contains( strQueue ) ) {
                    
                    GroupMember objGM = new GroupMember();
                    objGM.UserOrGroupId = strUserId;
                    objGM.GroupId = strqueue;
                    listGroupMembersForInsert.add( objGM );
                    
                }
            
            }
            
            for ( String strQueue : setSelectedQueues ) {
            
                if ( !setUpdatedQueues.contains( strQueue ) ) {
                    
                    setGroupIds.add( strQueue );
                    
                }
            
            }
            
            if ( setGroupIds.size() > 0 ) {
                
                delete [ SELECT Id FROM GroupMember WHERE UserOrGroupId =: strUserId AND GroupId IN: setGroupIds ];
            }
            
            if ( listGroupMembersForInsert.size() > 0 ) {
            
                insert listGroupMembersForInsert;
                
            }

            return 'Successful';
            
        
        } catch ( Exception e ) {
        
            throw new AuraHandledException( e.getMessage() );
            
        }
    
    }
    
    public class QueueWrapper {

        @AuraEnabled
        public List < QueueOptionWrapper > availableQueues;
        @AuraEnabled
        public List < String > selectedQueues;

    }

    public class QueueOptionWrapper {

        @AuraEnabled
        public String value;
        @AuraEnabled
        public String label;

    }

}

HTML:
<template>
    <lightning-card>
        <lightning-dual-listbox
            label="Select/Remove Queues"
            source-label="Available Queues(s)"
            selected-label="Selected Queues(s)"
            options={availableQueues}
            value={selectedQueues}
            onchange={handleChange}
            class="slds-m-around_medium">
        </lightning-dual-listbox>
        <p slot="footer">
            <lightning-button
                variant="brand"
                label="Save"
                onclick={saveChanges}>
            </lightning-button>
        </p>
    </lightning-card>    
</template>

JavaScript:
import { LightningElement, wire } from 'lwc';
import fetchQueueAssignments from '@salesforce/apex/QueueAssignmentController.fetchQueueAssignments';
import addRemoveQueues from '@salesforce/apex/QueueAssignmentController.addRemoveQueues';
import { ShowToastEvent } from 'lightning/platformShowToastEvent';

export default class QueueAssignment extends LightningElement {

    availableQueues;
    selectedQueues;
    updatedQueues;

    @wire( fetchQueueAssignments )  
    wiredRecs( { error, data } ) {

        if ( data ) {

            console.log( 'Records are ' + JSON.stringify( data ) );
            this.availableQueues = data.availableQueues;
            this.selectedQueues = data.selectedQueues;

        } else if ( error ) {

            console.log( 'Error ' + JSON.stringify( error ) );

        }
        
    }

    handleChange( event ) {

        const selectedOptionsList = event.detail.value;
        console.log( 'Selected Options are ' + JSON.stringify( selectedOptionsList ) );
        this.updatedQueues = selectedOptionsList;

    }

    saveChanges() {

        addRemoveQueues( { selectedQueues : this.selectedQueues, updatedQueues : this.updatedQueues } )
        .then( result => {

            console.log( 'Result ' + JSON.stringify( result ) );
            let message;
            let variant;

            if ( result === 'Successful' ) {

                message = 'Successfully Processed!';
                variant = 'success';

            } else {

                message = 'Some error occured. Please reach out to your Admin';
                variant = 'error';
                
            }

            const toastEvent = new ShowToastEvent( {

                title: 'Queue(s) Assignment',
                message: message,
                variant: variant

            } );
            this.dispatchEvent( toastEvent );

        } )
        .catch( error => {

            console.log( 'Error ' + JSON.stringify( error ) );
            
        } );
        this.selectedQueues = this.updatedQueues;
            
    }

}

meta.xml:
<?xml version="1.0" encoding="UTF-8"?>
<LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata">
    <apiVersion>52.0</apiVersion>
    <isExposed>true</isExposed>
    <targets>
        <target>lightning__Tab</target>
    </targets>
</LightningComponentBundle>
 
Output:
 

 
Note:
This works only for user assigned to queue. This is not work users assigned via Public Groups.

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