How to upload files in Lightning Web Component (LWC) Salesforce

by Rijwan Mohmmed
6 comments

We will use lightning-file-upload for file upload. We can upload multiple files with this.

lightning-file-upload base component with the below attributes :

  • label: Label for the Upload Files button.
  • name: Name of the component.
  • accept: To restrict the File Types. Only Files Types provided in the list are supported for uploading.
  • record-id: To associate uploaded files to a particular record.
  • onuploadfinished: This method will be called once the file is uploaded successfully.
  • multiple : To upload multiple files
<lightning-file-upload
            label="File Upload"
            name="fileUploader"
            accept={acceptedFormats}
            record-id={myRecordId}
            onuploadfinished={handleUploadFinished}
            multiple>
    </lightning-file-upload>

fileupload.html :

<template>
    <lightning-card title="File Upload in LWC">
        <div class="slds-p-horizontal_x-small" >
            <lightning-layout>
                <lightning-layout-item size="12">
                    <div class="slds-p-left_medium">
                        <lightning-file-upload
                            label="Attach Files"
                            name="uploadFile"
                            accept={acceptedFormats}
                            record-id={recordId}    
                            onuploadfinished={handleUploadFinished} multiple>
                        </lightning-file-upload>
                    </div> 
                </lightning-layout-item>
            </lightning-layout>
            <br/>
            <lightning-layout>    
                <lightning-layout-item size="12">
                    <div class="slds-p-left_medium">
                       <h2> Uploaded Files:</h2> <br/>
                        <table class="slds-table slds-table_cell-buffer slds-table_bordered" aria-label="Example default base table of Opportunities">
                            <thead>
                                <tr class="slds-line-height_reset">
                                    <th class="" scope="col">
                                        <div class="slds-truncate" title="File Name">File Name</div>
                                    </th>
                                    <th class="" scope="col">
                                        <div class="slds-truncate" title="File Size">File Type</div>
                                    </th>
                                    <th class="" scope="col">
                                        <div class="slds-truncate" title="File Size">File Size</div>
                                    </th>
                                </tr>
                            </thead>
                            <tbody>
                                <template for:each={lstAllFiles} for:item="fileIterator">
                                    <tr class="slds-hint-parent" key={fileIterator}>
                                        <th data-label="Opportunity Name" scope="row">
                                            <lightning-icon icon-name="doctype:image" size="small" title="Image"></lightning-icon>
                                            {fileIterator.ContentDocument.Title}
                                        </th>
                                        <td data-label="Account Name">
                                            <div class="slds-truncate" title="Cloudhub">
                                                {fileIterator.ContentDocument.FileType}
                                            </div>
                                        </td>
                                        <td data-label="Account Name">
                                            <div class="slds-truncate" title="Cloudhub">
                                                {fileIterator.ContentDocument.ContentSize} Byte
                                            </div>
                                        </td>
                                    </tr>
                                </template>
                            </tbody>
                        </table>
                    </div>
                </lightning-layout-item>
            </lightning-layout>
        </div>
    </lightning-card>
</template>

fileupload.js :

import { LightningElement, track,api } from 'lwc';
import fetchFiles from '@salesforce/apex/Fileuploadcttrl.fetchFiles';
export default class Fileupload extends LightningElement {
    @api recordId;
    @track lstAllFiles;
    @track error;
    get acceptedFormats() {
        return ['.pdf','.png','.jpg'];
    }

    handleUploadFinished(event) {
        this.connectedCallback();
    }

    connectedCallback() {
        fetchFiles({recordId:this.recordId})
        .then(result=>{
            this.lstAllFiles = result; 
            this.error = undefined;
        }).catch(error=>{
            this.lstAllFiles = undefined; 
            this.error = error;
        })
    }
}

fileupload.js-meta.xml :

<?xml version="1.0"?>
<LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata">
	<apiVersion>51.0</apiVersion>
	<isExposed>true</isExposed>
	<targets>
		<target>lightning__RecordPage</target>
	</targets>
</LightningComponentBundle>

Fileuploadcttrl.cls :

public class Fileuploadcttrl {
    @AuraEnabled(cacheable=false)
    public static List<ContentDocumentLink> fetchFiles(String recordId){
        return [SELECT LinkedEntityId, ContentDocument.CreatedDate, ContentDocument.Title, ContentDocument.ContentSize, ContentDocument.FileType 
                    FROM ContentDocumentLink  
                WHERE LinkedEntityId  =:recordId];
    }
}

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6 comments

John May 18, 2022 - 8:27 pm

That is when you have the recordId, What about when is a form ? When Creating a support case you need attachments. who do you add the files?

Reply
Rijwan Mohmmed May 23, 2022 - 3:38 pm

In your case, you can use a custom file upload LWC component.
Upload Custom File in Lightning Web Component(LWC)

Reply
Asad June 23, 2022 - 12:13 pm

How about when I want to send Uploaded file to my Component, how to I catch that?

Reply
Rijwan Mohmmed June 25, 2022 - 6:43 am

Hi @Asad Can you please explain more about this

Reply
anonymous August 5, 2022 - 8:40 am

Hi, I want to upload multiple files of large size to box folder from salesforce. Could you Please tell me how can I do that?

Reply
Rijwan Mohmmed August 6, 2022 - 5:55 pm

By Salesforce Apex, I don’t think so we can but you can do it by LWC HTTP call out, below is my blog
https://techdicer.com/upload-image-by-http-callout-in-lwc/

Reply

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