Upload Files in Lightning Component

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Hey guys, In this post we are going to learn about how to upload files in Salesforce lightning component.

In this example we will attached the files from Custom sObject by help of wrapper apex class in lightning component.

Files we used in this post example:-

File Name	File Type	Description
uploadAttachmentCmp.cmp	Lightning Component	It is used to user interface display upload button and toast success message on browser.
uploadAttachmentCmpConroller.js	JavaScript Controller File	It is used for client side javascript function that is communicate to apex class method.
uploadFileController.apxc	Apex Class Controller	Upload the file into database server
Custom Object:- childObjTrigger__c	Custom Object	Upload the attachment files on custom sObject Files & Attechment section.

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Note:- Custom sObject >> childObjTrigger__c

You need to change custom sObject name with your custom sObject name.

Step 1:- Create Lightning Component : uploadAttachmentCmp.cmp

From Developer Console >> File >> New >> Lightning Component

uploadAttachmentCmp.cmp [Lightning Component File]

   <aura:component controller="uploadFileController" implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction" access="global" >
	<aura:attribute name="wrapListItems" type="childObjTrigger__c[]"/>
       <aura:handler name="init" value="{!this}" action="{!c.doInit}"/>
    
       <aura:attribute name="accept" type="List" default="['.jpg', '.jpeg','.pdf']"/>
       <aura:attribute name="multiple" type="Boolean" default="true"/>
       <aura:attribute name="disabled" type="Boolean" default="false"/>   
    
    <div class="slds">        
        
        <table class="slds-table slds-table--bordered slds-table--col-bordered" style="border-collapse:collapse;">
            <thead> 
                <tr>                    
                    <th>Attachment</th>                   
                </tr>
            </thead>
            <tbody>
                <aura:iteration items="{!v.wrapListItems}" var="childObjVar" indexVar="index">
                    <tr id="{!childObjVar.recordId}">                        
                        <td>
                            <lightning:fileUpload
                              multiple="{!v.multiple}" 
                              accept="{!v.accept}"
                              recordId="{!childObjVar.recordId}" 
                              onuploadfinished="{!c.uploadFileAction}" disabled="{!v.disabled}"/>
                        </td>
                    </tr>
                </aura:iteration>
            </tbody>
        </table>        
        
    </div>
    
   </aura:component>

<aura:component controller="uploadFileController" implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction" access="global" >

<aura:attribute name="wrapListItems" type="childObjTrigger__c[]"/>

<aura:handler name="init" value="{!this}" action="{!c.doInit}"/>

<aura:attribute name="accept" type="List" default="['.jpg', '.jpeg','.pdf']"/>

<aura:attribute name="multiple" type="Boolean" default="true"/>

<aura:attribute name="disabled" type="Boolean" default="false"/>

<thead>

<tr>

<th>Attachment</th>

</tr>

</thead>

<tbody>

<aura:iteration items="{!v.wrapListItems}" var="childObjVar" indexVar="index">

<td>

<lightning:fileUpload

multiple="{!v.multiple}"

accept="{!v.accept}"

recordId="{!childObjVar.recordId}"

onuploadfinished="{!c.uploadFileAction}" disabled="{!v.disabled}"/>

</td>

</tr>

</aura:iteration>

</tbody>

</table>

</div>

</aura:component>

Step 2:- Create Lightning Component : uploadAttachmentCmpController.js

From Developer Console >> File >> New >> Lightning Component >> JavaScript Controller

uploadAttachmentCmpController.js [JavaScript Controller]

   ({
    doInit : function(component, event, helper) {
        var action = component.get("c.childObjWrapMethod"); 
        
        action.setCallback(this, function(response){
            var state = response.getState();
            
            if(state=='SUCCESS'){
                var result = response.getReturnValue();                
                component.set('v.wrapListItems',result);
            }
        });
        $A.enqueueAction(action);
    },
    
    uploadFileAction : function(component, event, helper) {
        var uploadedFiles = event.getParam("files");
        var documentId = uploadedFiles[0].documentId;
        var fileName = uploadedFiles[0].name;
        var toastEvent = $A.get("e.force:showToast");
        toastEvent.setParams({
            "title": "Success!",   
            "type": "success",
            "message": "File "+fileName+" Uploaded successfully."
        });
        toastEvent.fire();
        $A.get('e.force:refreshView').fire();         
       },
   })

({

doInit : function(component, event, helper) {

var action = component.get("c.childObjWrapMethod");

action.setCallback(this, function(response){

var state = response.getState();

if(state=='SUCCESS'){

var result = response.getReturnValue();

component.set('v.wrapListItems',result);

}

});

$A.enqueueAction(action);

uploadFileAction : function(component, event, helper) {

var uploadedFiles = event.getParam("files");

var documentId = uploadedFiles[0].documentId;

var fileName = uploadedFiles[0].name;

var toastEvent = $A.get("e.force:showToast");

toastEvent.setParams({

"title": "Success!",

"type": "success",

"message": "File "+fileName+" Uploaded successfully."

});

toastEvent.fire();

$A.get('e.force:refreshView').fire();

})

Step 3:- Create Lightning Application : uploadFileController.apxc

From Developer Console >> File >> New >> Apex Class

uploadFileController.apxc [Apex Class Controller]

   public class cloneFilesFromOldCaseToNew {
    
    public class wrapperChildObjClass{                
        @AuraEnabled
        public Id recordId;        
        
        public wrapperChildObjClass(Id recordId){            
            this.recordId = recordId;                
        }
    }
    
    
    @AuraEnabled
    public static List<wrapperChildObjClass> childObjWrapMethod(){
      List<wrapperChildObjClass> wrapObj = new List<wrapperChildObjClass>();   
       List<childObjTrigger__c> childObjList = [Select Id, Name From childObjTrigger__c limit 1];         
        for(childObjTrigger__c childObjWrp: childObjList){
            wrapObj.add(new wrapperChildObjClass(childObjWrp.Id));
        }     
        return wrapObj;
     }    
   }

public class cloneFilesFromOldCaseToNew {

public class wrapperChildObjClass{

@AuraEnabled

public Id recordId;

public wrapperChildObjClass(Id recordId){

this.recordId = recordId;

}

@AuraEnabled

public static List<wrapperChildObjClass> childObjWrapMethod(){

List<wrapperChildObjClass> wrapObj = new List<wrapperChildObjClass>();

List<childObjTrigger__c> childObjList = [Select Id, Name From childObjTrigger__c limit 1];

for(childObjTrigger__c childObjWrp: childObjList){

wrapObj.add(new wrapperChildObjClass(childObjWrp.Id));

}

return wrapObj;

}

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Step 4:-Final >> Check Output