ApexLWC

Mass Attachments/Documents Download in Salesforce LWC

cafeforce
cafeforce 5.9k Views 18 comments
Mass Bulk Attachment Download LWC

Isn’t it painful if you have multiple Attachments on a record and you have multiple such records and you need to download all attachments/Documents?

Contents
Component Features:Demo GIF:Screenshots:Step-1: Create an Apex controllerStep-2: Now we will create the massFilesDownload Lightning Web Component.Step-3: Now we will add the component on record Lightning Page.

Clicking every record and then opening each attachment and clicking download is a long and fussy process.

This component is a dual component and it will work 2-way.

  1. Download mass Attachments of a particular record by adding component on the record lightning page.
  2. Bulk download Attachments of any Object by adding component on the non-record page.

Component Features:

  • Download attachments of any object.
  • Download attachments of a particular record only.
  • Pagination buttons to navigate.
  • Set custom record display size.
  • Filter attachments by Year/Month of any object.

Demo GIF:

  1. Record Lightning Page LWC Component

Mass Attachments LWC

2. Home Lightning Page LWC Component

Mass Files Download LWC

Screenshots:

Mass Files Attachment LWC Filter Mass Files Document Download LWC

Mass Files LWC Record Filter

 

Step-1: Create an Apex controller

Our apex controller will fetch the Object list if the component is added on the home lightning page and query the ContentDocument Records. Here we are using a wrapper class for object list which will return records in the form of value and label.

Create MassFilesDownloadController.cls Apex class.

MassFilesDownloadController.cls
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/* Code by CafeForce || www.cafeforce.com || support@cafeforce.com || Mandatory Header */
public with sharing class MassFilesDownloadController {
    
    @AuraEnabled
    public static List<PicklistOptions> fetchObjectList() {
        List<PicklistOptions> objectList = new List<PicklistOptions>();
        for(Schema.SObjectType objTyp : Schema.getGlobalDescribe().Values()) {
            Schema.DescribeSObjectResult describeSObjectRes = objTyp.getDescribe();
            if(describeSObjectRes.isQueryable() && describeSObjectRes.isUpdateable() && describeSObjectRes.isSearchable() &&
            describeSObjectRes.isAccessible() && describeSObjectRes.isCreateable() && !describeSObjectRes.isCustomSetting()) {
                String name = objTyp.getDescribe().getName();
                if(!name.containsignorecase('history') && !name.containsignorecase('tag')&&
                 !name.containsignorecase('share') && !name.containsignorecase('feed'))
                {
                    objectList.add( new PicklistOptions(describeSObjectRes.getLabel(), describeSObjectRes.getName()) );
                }
            }
        }
        objectList.sort();
        return objectList;
    }
 
    @AuraEnabled
    public static List<ContentDocumentLink> fetchFiles(String objectName, String recordId, String year, String month) {
        try {
            String query = 'SELECT ContentDocumentId, ContentDocument.Title, ContentDocument.FileType, ContentDocument.ContentSize, ContentDocument.LastModifiedDate, ContentDocument.CreatedDate, LinkedEntity.Type FROM ContentDocumentLink ';
            if(String.isNotBlank(objectName)) {
                query += ' where LinkedEntityId in ( SELECT Id FROM '+objectName+') and LinkedEntity.Type =: objectName';
                if(String.isNotBlank(year)) {
                        query += ' AND calendar_year(ContentDocument.LastModifiedDate) = ' + year;
                }
                if(String.isNotBlank(month)) {
                    query += ' AND calendar_month(ContentDocument.LastModifiedDate) = '+month;
                }
            }
            if(String.isNotBlank(recordId)) {
                query += ' where LinkedEntityId = \'' + recordId + '\'';
            }
            return Database.query(query);
        } catch(Exception ex) {
            throw new AuraHandledException(ex.getMessage());
        }
    }
 
    public class PicklistOptions implements Comparable {
        @AuraEnabled public String label;
        @AuraEnabled public String value;
        public PicklistOptions(String label, String value) {
            this.label = label;
            this.value = value;
        }
        public Integer compareTo(Object ObjToCompare) {
            return label.CompareTo(((PicklistOptions)ObjToCompare).label);
        }
    }
}
/*
    Code by CafeForce
    Website: http://www.cafeforce.com
    DO NOT REMOVE THIS HEADER/FOOTER FOR FREE CODE USAGE
*/
 

Step-2: Now we will create the massFilesDownload Lightning Web Component.

For creating a new LWC component, you need to use the VS Code IDE.

Open the HTML file massFilesDownload.html and paste the below code.

massFilesDownload.html
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<!-- Code by CafeForce || www.cafeforce.com || support@cafeforce.com || Mandatory Header -->
 
<template>
    <div class="MFD">
        <div if:true={showSpinner}>
            <lightning-spinner alternative-text="Loading" size="small" ></lightning-spinner>
        </div>
        <div class="slds-clearfix slds-var-p-around_medium headerTopDiv">
            <div class="slds-float_left">
                <p class="slds-text-heading_small slds-p-around_x-small"><b>Mass Files Download
                    <template if:true={data}> | Total Files - {totalFiles}</template>
                </b></p>
            </div>
            <div class="slds-float_right">
                <lightning-button-group>
                    <lightning-button-icon icon-name="utility:refresh" variant="border-filled" alternative-text="Refresh" onclick={fetchDocumentRecords} disabled={disableRecordDropdown}></lightning-button-icon>
                    <lightning-button label="Download" icon-name="utility:download" onclick={downloadFiles}></lightning-button>
                    <lightning-button-icon icon-name="utility:chevronleft" variant="border-filled" name="Previous" alternative-text="previous" onclick={handleNavigation} disabled={disablePreviousButton}></lightning-button-icon>
                    <lightning-button-icon icon-name="utility:chevronright" variant="border-filled" name="Next" alternative-text="next" onclick={handleNavigation} disabled={disableNextButton}></lightning-button-icon> &nbsp;
                    <lightning-combobox name="recordSize"
                        variant="label-hidden" value={recordSize}
                        placeholder="Page" options={recordSizeList} disabled={disableRecordDropdown}
                        class="pageCombobox" onchange={handleRecordSizeChange} ></lightning-combobox>
                </lightning-button-group>
            </div>
        </div>
        <div if:false={recordId} class="slds-p-bottom_medium slds-p-left_medium slds-p-right_medium headerTopDiv">
            <div class="displayInline">
                <lightning-combobox name="object" variant="label-hidden" value={selectedbject} placeholder="Select Object" options={objectOptions} onchange={handleObjectChange} required></lightning-combobox> &nbsp;
                <lightning-combobox name="year" variant="label-hidden" value={selectedYear} placeholder="Year" options={yearOptions} class="yearCombobox" onchange={handleYearChange} ></lightning-combobox> &nbsp;
                <lightning-combobox name="month" variant="label-hidden" value={selectedMonth} placeholder="Month" options={monthOptions} class="monthCombobox" onchange={handleMonthChange} ></lightning-combobox> &nbsp;
                <lightning-button label="Fetch" variant="label-hidden" name="Fetch" onclick={fetchDocumentRecords} disabled={disableFetch}></lightning-button>
            </div>
        </div>
        <div class="bodyDiv">
            <template if:true={recordList}>
                <div class="slds-grid slds-wrap tableHeader">
                    <div class="slds-col slds-size_1-of-12 slds-p-around_xx-small">
                    </div>
                    <div class="slds-col slds-size_4-of-12 slds-p-top_x-small slds-p-bottom_x-small slds-p-right_x-small slds-p-left_small displayInline">
                        <lightning-input type="checkbox" data-id="headerCheckbox" onclick={handleHeaderCheckbox} name="headerCheckbox" variant="label-hidden"></lightning-input>
                        <span class="slds-p-left_small">Title</span>
                    </div>
                    <div class="slds-col slds-size_2-of-12 slds-p-around_x-small">
                        Size
                    </div>
                    <div class="slds-col slds-size_2-of-12 slds-p-around_x-small">
                        Type
                    </div>
                    <div class="slds-col slds-size_2-of-12 slds-p-around_x-small">
                        Last Modified
                    </div>
                    <div class="slds-col slds-size_1-of-12 slds-p-around_x-small">
                        Download
                    </div>
                </div>
                <template for:each={recordList} for:item="rec" for:index="index">
                    <div key={rec.Id} class="slds-grid slds-wrap tableBody">
                        <div class="slds-col slds-size_1-of-12 slds-p-left_large slds-p-top_small">
                            {rec.count}
                        </div>
                        <div class="slds-col slds-size_4-of-12 slds-p-around_small slds-truncate displayInline">
                            <lightning-input type="checkbox" data-id="checkbox" value={rec.check} name={rec.ContentDocumentId} onchange={handleCheckbox} variant="label-hidden" style="min-width: 24px;"></lightning-input>
                            <a target="_blank" onclick={navigateToRecordViewPage} data-key={rec.ContentDocumentId} class="slds-p-left_small slds-truncate">{rec.ContentDocument.Title}</a>
                        </div>
                        <div class="slds-col slds-size_2-of-12 slds-p-around_small slds-truncate">
                            {rec.size}
                        </div>
                        <div class="slds-col slds-size_2-of-12 slds-p-around_small">
                            {rec.ContentDocument.FileType}
                        </div>
                        <div class="slds-col slds-size_2-of-12 slds-p-around_small">
                            <lightning-formatted-date-time value={rec.ContentDocument.LastModifiedDate}></lightning-formatted-date-time>
                        </div>
                        <div class="slds-col slds-size_1-of-12 slds-p-around_x-small tableCell">
                            <lightning-button-icon name={rec.ContentDocumentId} icon-name="utility:download" variant="border-filled" alternative-text="download" onclick={downloadFile}></lightning-button-icon>
                        </div>
                    </div>
                </template>
            </template>
            <template if:false={recordList}>
                <p class="noDataDiv">No Files Found</p>
            </template>
        </div>
    </div>
</template>
<!--
    Code by CafeForce
    Website: http://www.cafeforce.com
    DO NOT REMOVE THIS HEADER/FOOTER FOR FREE CODE USAGE
-->
 

 

Now open the JS file massFilesDownload.js and paste the below code.

massFilesDownload.js
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/* Code by CafeForce || www.cafeforce.com || support@cafeforce.com || Mandatory Header */
 
import { LightningElement, track, api } from 'lwc';
import { NavigationMixin } from 'lightning/navigation';
import { ShowToastEvent } from 'lightning/platformShowToastEvent';
import fetchObjectList from '@salesforce/apex/MassFilesDownloadController.fetchObjectList';
import fetchFiles from '@salesforce/apex/MassFilesDownloadController.fetchFiles';
 
export default class MassFilesDownload extends NavigationMixin(LightningElement) {
 
    @api objectApiName;
    @api recordId;
    @track objectOptions = [];
    @track yearOptions = [];
    @track monthOptions = [];
    @track selectedObject;
    @track selectedYear;
    @track selectedMonth;
    @track recordList;
    @track data;
    @track pageNumber = 1;
    @track recordSize = '10';
    @track totalRecords;
    @track totalPages;
    @track showSpinner;
    @track selectedFiles = new Set();
 
    connectedCallback() {
        if(this.recordId) {
            this.fetchDocumentRecords();
        } else {
            this.showSpinner = true;
            fetchObjectList()
            .then(result => {
                this.objectOptions = result;
 
                var today = new Date();
                var yearList = [];
                yearList.push({'label': (today.getFullYear() - 2).toString(), 'value': (today.getFullYear() - 2).toString()});
                yearList.push({'label': (today.getFullYear() - 1).toString(), 'value': (today.getFullYear() - 1).toString()});
                yearList.push({'label': today.getFullYear().toString(), 'value': today.getFullYear().toString()});
                this.yearOptions = yearList;
 
                var monthList= [];
                for(var i = 1; i <= 12; i++) {
                    monthList.push({'label': i.toString(), 'value': i.toString()});            
                }
                this.monthOptions = monthList;
                this.showSpinner = false;
            }).catch(error => {
                console.log(error);
                this.showSpinner = false;
            })
        }
    }
 
    handleObjectChange(event) {
        this.selectedObject = event.detail.value;
    }
 
    handleYearChange(event) {
        this.selectedYear = event.detail.value;
    }
 
    handleMonthChange(event) {
        this.selectedMonth = event.detail.value;
    }
 
    get disableFetch() {
        if(!this.selectedObject)
            return true;
    }
 
    get totalFiles() {
        return this.data.length;
    }
 
    get recordSizeList() {
        let recordSizeList = [];
        recordSizeList.push({'label':'10', 'value':'10'});
        recordSizeList.push({'label':'25', 'value':'25'});
        recordSizeList.push({'label':'50', 'value':'50'});
        recordSizeList.push({'label':'100', 'value':'100'});
        return recordSizeList;
    }
 
    get disablePreviousButton() {
        if(!this.data || this.data.length == 0 || this.pageNumber == 1)
            return true;
    }
 
    get disableNextButton() {
        if(!this.data || this.data.length == 0 || this.pageNumber == this.totalPages)
            return true;
    }
 
    get disableRecordDropdown() {
        if(!this.data || this.data.length == 0)
            return true;
    }
 
    downloadFiles() {
        if(this.selectedFiles && this.selectedFiles.size > 0) {
            for(let item of this.selectedFiles) {
                this.download(item);
            }
        } else {
            this.showNotification('Please select a File', 'error');
        }
    }
 
    handleCheckbox(event) {
        let checkbox = this.template.querySelectorAll('[data-id="headerCheckbox"]');
        if(this.selectedFiles.has(event.target.name) && !event.target.checked) {
            checkbox[0].checked = false;
            this.selectedFiles.delete(event.target.name);
        } else {
            this.selectedFiles.add(event.target.name);
            if(this.selectedFiles.size == this.recordList.length) {
                checkbox[0].checked = true;
            }
        }
    }
 
    handleHeaderCheckbox(event) {
        let checkboxes = this.template.querySelectorAll('[data-id="checkbox"]')
        for(let i=0; i<checkboxes.length; i++) {
            checkboxes[i].checked = event.target.checked;
        }
        
        for(let i = 0; i < this.recordList.length; i++) {
            if(event.target.checked) {
                this.selectedFiles.add(this.recordList[i].ContentDocumentId);
            } else {
                this.selectedFiles.delete(this.recordList[i].ContentDocumentId);
            }
        }
        this.headerCheckbox = true;
    }
 
    resetCheckboxes() {
        let checkboxes = this.template.querySelectorAll('[data-id="checkbox"]')
        for(let i=0; i<checkboxes.length; i++) {
            checkboxes[i].checked = false;
        }
        let headerCheckbox = this.template.querySelectorAll('[data-id="headerCheckbox"]');
        if(headerCheckbox && headerCheckbox.length > 0)
            headerCheckbox[0].checked = false;
    }
 
    handleRecordSizeChange(event) {
        this.recordSize = event.detail.value;
        this.pageNumber = 1;
        this.totalPages = Math.ceil(this.totalRecords / Number(this.recordSize));
        this.processRecords();
    }
 
    handleNavigation(event){
        let buttonName = event.target.name;
        if(buttonName == 'Next') {
            this.pageNumber = this.pageNumber >= this.totalPages ? this.totalPages : this.pageNumber + 1;
        } else if(buttonName == 'Previous') {
            this.pageNumber = this.pageNumber > 1 ? this.pageNumber - 1 : 1;
        }
        this.processRecords();
    }
 
    processRecords() {
        this.selectedFiles = new Set();
        this.resetCheckboxes();
        this.showSpinner = true;
        var uiRecords = [];
        var startLoop = ((this.pageNumber - 1) *  Number(this.recordSize));
        var endLoop =  (this.pageNumber *  Number(this.recordSize) >= this.totalRecords) ? this.totalRecords : this.pageNumber *  Number(this.recordSize);
        for(var i = startLoop; i < endLoop; i++) {
            uiRecords.push(JSON.parse(JSON.stringify(this.data[i])));
        }
        this.recordList = JSON.parse(JSON.stringify(uiRecords));
        this.showSpinner = false;
    }
 
    fetchDocumentRecords() {
        this.showSpinner = true;
        this.pageNumber = 1;
        this.recordList = [];
        this.data = [];
        this.selectedFiles = new Set();
        this.resetCheckboxes();
        fetchFiles({
            objectName : this.selectedObject,
            recordId : this.recordId,
            year : this.selectedYear,
            month : this.selectedMonth
        })
        .then(result => {
            //console.log(result);
            if(result && result.length > 0) {
                for(var i = 0; i < result.length; i++) {
                    var contentSize = result[i].ContentDocument.ContentSize;
                    var size = (contentSize >= 1024) ? ((contentSize/1024 >= 1024) ? (Number(contentSize/1048576).toFixed(2) + ' MB') : (Number(contentSize/1024).toFixed(2) + ' KB')) : (Number(contentSize).toFixed(2) + ' Bytes');
                    result[i].size = size;
                    result[i].count = i+1;
                    result[i].check = false;
                }
                this.totalRecords = result.length;
                this.totalPages = Math.ceil(Number(result.length)/Number(this.recordSize));
                this.data = JSON.parse(JSON.stringify(result));
                
                var uiRecords = [];
                var recordDisplaySize = result.length < Number(this.recordSize) ? result.length : Number(this.recordSize);
                for(var i = 0; i < recordDisplaySize; i++) {
                    uiRecords.push(JSON.parse(JSON.stringify(result[i])));
                }
                this.recordList = JSON.parse(JSON.stringify(uiRecords));
            }
            this.showSpinner = false;
        }).catch(error => {
            console.log(error);
            if(error && error.body && error.body.message)
                this.showNotification(error.body.message, 'error');
            this.showSpinner = false;
        })
    }
 
    showNotification(message, variant) {
        const evt = new ShowToastEvent({
            'message': message,
            'variant': variant
        });
        this.dispatchEvent(evt);
    }
 
    navigateToRecordViewPage(event) {
        if(event.currentTarget.dataset.key) {
            this[NavigationMixin.Navigate]({
                type: 'standard__recordPage',
                attributes: {
                    recordId: event.currentTarget.dataset.key,
                    objectApiName: 'ContentDocument',
                    actionName: 'view'
                }
            });
        }
    }
 
    downloadFile(event) {
        if(event.target.name) {
            this.download(event.target.name);
        }
    }
 
    download(recordId) {
        this[NavigationMixin.Navigate]({
            type: 'standard__webPage',
            attributes: {
                url: window.location.origin + '/sfc/servlet.shepherd/document/download/' + recordId
            }
        }, false);
    }
}
/*
    Code by CafeForce
    Website: http://www.cafeforce.com
    DO NOT REMOVE THIS HEADER/FOOTER FOR FREE CODE USAGE
*/
 

 

Now paste the CSS in the massFilesDownload.css file.

massFilesDownload.css
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.MFD {
    background: #fff;
    position: relative;
}
.MFD .headerTopDiv {
    background-color: #F3F2F2;
}
.MFD .headerText {
    font-size: 17px;
}
.MFD .tableHeader {
    font-weight: 600;
    color: #777;
    background-color: #FAFAF9;
    border-top: 1px solid #ddd;
    border-bottom: 1px solid #ddd;
}
.MFD .tableCell {
    padding: 5px;
}
.MFD .tableBody {
    border-bottom: 1px solid #ddd;
}
.MFD .tableBody:hover {
    background-color:#eee;
}
.MFD .bodyDiv {
    height: 265px;
    max-height: 300px;
    overflow: auto;
}
.MFD .displayInline {
    display: inline-flex;
}
.MFD .yearCombobox, .monthCombobox, .pageCombobox {
    width: 100px;
}
.MFD .noDataDiv {
    text-align: center;
    font-size: 16px;
    font-weight: 700;
    padding: 20px;
}
/* For Scrolling */
::-webkit-scrollbar {
    width: 7px;
    height: 7px;
}
::-webkit-scrollbar-track {
   display: none !important;
}
::-webkit-scrollbar-thumb {
    border-radius: 10px;
    background: rgba(0,0,0,0.4);
}
 

 

Now open the meta file massFilesDownload.js-meta.xml and paste the below code.

massFilesDownload.js-meta.xml
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<?xml version="1.0" encoding="UTF-8"?>
<LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata">
    <apiVersion>49.0</apiVersion>
    <isExposed>true</isExposed>
    <targets>
        <target>lightning__AppPage</target>
        <target>lightning__RecordPage</target>
        <target>lightning__HomePage</target>
    </targets>
</LightningComponentBundle>
 

 

Step-3: Now we will add the component on record Lightning Page.

  1. Go to the record where you want to put this component.
  2. Click on Setting Icon on top and click on Edit Page.
  3. Now on the Lightning Builder drop the massFilesDownload component from the left pane onto the screen.
  4. Save the page and Activate for Org Default and click on the back button.
  5. Your component is visible now on the screen.

Finally, our component is ready to use. You can change the record display size in the component. You can either download a single Attachment or bulk select the attachment and click on the download button on top.

Mass Attachments Download LWC

Bulk File LWC Download

Also Check:

Custom Lookup in LWC

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Pooja

Nice Post, Really Helpful in downloading Bulk Attachments of any Object but showing error on few Objects that this Object is not supported.

Reply
cafeforce

Thank You Pooja for the Appreciation… 🙂 Yes, few Standard Objects are not supported to store Attachments. Although many useless objects are filtered still a few are left on which Content Document query or Attachment is not supported by Salesforce.

Reply
Ayush

Hello,

I hope you are doing.

Could you please let me know if this supports Opportunity?

Thanks.

Reply
cafeforce

Hi Ayush,

Yes, it absolutely supports Opportunity.

Reply
Juan Sesan

Hi, how are you?

Could you please let me know if this supports Cases?

Thank you very much!

Reply
cafeforce

Hi Juan,

Definitely, Cases are supported by this component

Reply
Juan Sesan

Hey thank you so much, it was realy useful.

Do you know what adjustment do i need to implement for download all the files in a zip?

Thank you again, have a nice day.

Reply
cafeforce

Hi Juan,
Thanks for the appreciation.

For downloading all files into a zip, you need to use a third-party zip library in your code. I will share the code soon for the same.

Reply
Regi Varghese

Hi Suyash,
Do you have the code for downloading all the files into a zip?

Reply
cafeforce

Hi Regi,

No, Not yet. You have to use a third-party library for downloading files into the zip.

Reply
alex

hi,
nice work! I thought about improving UX little bit and wonder if you know any possibility to prevent redirects to new tabs in browser when we download multiple files?

Reply
cafeforce

Hi Alex,

Thanks! You can use a third party library to download selected files into a Zip format.

Reply
Ram

Hi , Can you share the code on how to download all files as Zip

Reply
cafeforce

Hi Ram,

That code is not ready yet. You need to use a third-party library for that.

Reply
Ryan

Hi Ram,

If you want to download the selected files as a zip, you need to adjust the URL like this:

/sfc/servlet.shepherd/document/download/ContentDocumentId/ContentDocumentId/ContentDocumentId

where each ContentDocumentId is the ID from the selected file you want to download. This works perfectly for me, I found out through this link below.

https://developer.salesforce.com/forums/?id=9060G0000005mu8QAA

Kind Regards,
Ryan

Reply
Oscar|

Do you have the test class for the controller?

Reply
cafeforce

Hi,

I don’t have a test class as of now. I will publish soon.

Reply
Sri

I have the exact requirement but for custom object, can you help if this can work on custom objects with few changes.

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