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How to download selected multiple files for a record using LWC component?

 Here is the LWC component, can be added to record page.

Apex Class

public class MultipleFilesDownLoadController {
    @AuraEnabled()
    public static  List<ContentDocumentLink> retriveFiles(String sLinkEntityId) {
        system.debug('sLinkEntityId--'+sLinkEntityId);
       
       List<ContentDocumentLink> listOfDocumentLink = [Select Id,ContentDocument.LatestPublishedVersionId,ContentDocumentId,ContentDocument.Title,ContentDocument.Owner.Name
                                                        FROM ContentDocumentLink
                                                       WHERE LinkedEntityId =:sLinkEntityId];
         system.debug('listOfDocumentLink---'+listOfDocumentLink);
        return  listOfDocumentLink;
    }
}

Component

<template>

    <lightning-card  variant="Narrow"  title="Files" icon-name="standard:file">
         <p slot="actions">
            <lightning-button class="slds-m-right_x-small slds-float_right" 
            variant="brand" label="Download"  onclick={downloadFiles} 
            icon-name="utility:download" >
            </lightning-button>
        </p> 
        <p class="slds-p-horizontal_small">
            <lightning-datatable data={filesData} 
                columns={columns} 
                key-field="id">
            </lightning-datatable>
        </p>    
    </lightning-card>    
</template>

JS Controller 

import { LightningElement,api } from 'lwc';
import retriveFiles from '@salesforce/apex/MultipleFilesDownLoadController.retriveFiles';
import { ShowToastEvent } from 'lightning/platformShowToastEvent';
import { NavigationMixin } from 'lightning/navigation';
const columns = [
    {label: 'Title', fieldName: 'Title'},  
    {label: 'Owner', fieldName: 'Owner'}          
];
export default class MultipleFilesDownLoad extends NavigationMixin (LightningElement) {
     @api recordId;
     @api columns = columns;
      filesData;
     sSelectedId = [];
     
     connectedCallback() {
        console.log('connected===============');
        console.log(this.recordId);
        if(this.recordId){
            retriveFiles({sLinkEntityId: this.recordId})
            .then(res => {
               console.log('intiala files ',JSON.stringify( res ) );
                 let tempRecords = JSON.parse( JSON.stringify( res ) );
                 console.log('tempRecords--',tempRecords);
                    tempRecords = tempRecords.map( row => {
                    return { ...row, Id:row.ContentDocument.LatestPublishedVersionId,Owner: row.ContentDocument.Owner.Name,Title:row.ContentDocument.Title};
                });
                this.filesData = tempRecords;
            }).catch(err => {
                console.log('error', err);
                this.showError(err.body.message);
            });
        }
    }

     showError(msg){
        const evt = new ShowToastEvent({
            title: 'File delete Error',
            message: msg,
            variant: "error"
        });
        this.dispatchEvent(evt);
    }
    

    downloadFiles(){
        var selectedRecords = this.template.querySelector("lightning-datatable").getSelectedRows(); 
        console.log('selectedRecords--'+JSON.stringify(selectedRecords));
        //this.selectedFiles = selectedRecords;
        // this.sSelectedId = ''
        for (const svalue of selectedRecords) {
            console.log(svalue);
            if(this.sSelectedId){
                this.sSelectedId.push(svalue.Id);
            }       
        
        }
        console.log('this.sSelectedId==',this.sSelectedId);
        if(this.sSelectedId.length > 0){
            let filesDownloadUrl = '/sfc/servlet.shepherd/version/download';
            this.sSelectedId.forEach( item => {
                        filesDownloadUrl += '/' + item
             });
            this[ NavigationMixin.Navigate ]( {
                        type: 'standard__webPage',
                        attributes: {
                            url: filesDownloadUrl
                        }
                    }, false );
            console.log( 'filesDownloadUrl is', filesDownloadUrl );
            this.dispatchEvent(
                        new ShowToastEvent( {
                            title: 'File(s) Download',
                            message: 'File(s) Download Successfully!!!',
                            variant: 'success'
                        } ),
                    );
        }
    }
}

XML 

<?xml version="1.0"?>
<LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata">
    <apiVersion>57.0</apiVersion>
    <isExposed>true</isExposed>
    <targets>
        <target>lightning__RecordPage</target>
    </targets>
</LightningComponentBundle>

Record Page



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