How to display upload Image if a record existing an attachment in lightning component? | how to display image icon in lightning component from attachment

Hey guys, In this post we are going to learn about how to Display an Upload Icon on the lightning component if a object record has files or any kind of attachment..

Requirement:- If upload a custom file on lightning component such like (jpg’, ‘jpeg’,’pdf’, ‘doc’) etc.. then against of every record display should be an attachment Image on right side of table.

Don’t forget to check out:- Upload Files in Lightning Component Click Here For More Information

Files we used in this post example:-

fileAttachmentCmp.cmp	Lightning Component	It is used for display the name, address, email, and upload file button on the table.
fileAttachmentCmpConroller.js	JavaScript Controller File	It is used for communicate to server side apex method and fetch the record using init fuction.
fileAttachmentCmpHelper.js	JavaScript Helper File	It is used for refresh the page after delete the record.
wrapperCustomObjCtrCmp.apxc	Apex Class Controller	It is used for save the upload images on sObject database.
Custom Object:- NewStudent__c Custom Object Fields:- Name, Email__c Address__c	Custom Object and their fields	Display an upload Image on right side of table in the lightning component if a record has an attachment.

Final Output

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Step 1:- Create Lightning Component : fileAttachmentCmp.cmp

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

fileAttachmentCmp.cmp [Lightning Component File]

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

```
 
```

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

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

    <aura:attribute name="recSelectId" type="String" default=""/>

```
 
```
```
 
```

    <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 slds-p-horizontal--medium">

        <table class="slds-table slds-table--bordered slds-table--col-bordered" style="border-collapse:collapse;">

```
            <thead> 
```
```
                <tr>
```
```
                    <th>Record Id</th>
```

                    <th>Student Name</th>

```
                    <th>Address</th>
```
```
                    <th>Email</th>
```

                     <th>Upload File</th>

```
                    <th></th>
```
```
                </tr>
```
```
            </thead>
```
```
            <tbody>
```

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

                    <tr id="{!wrapVar.recStudentId}">

                        <td>{!wrapVar.recStudentId}</td>

                        <td>{!wrapVar.studentName}</td>

                        <td>{!wrapVar.studentAddress}</td>

                        <td>{!wrapVar.studentEmail}</td>

```
                        <td>
```

                            <lightning:fileUpload

                              multiple="{!v.multiple}"

                              accept="{!v.accept}"

                              recordId="{!wrapVar.recStudentId}"

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

```
                        </td>
```
```
                        <td>
```

                            <aura:if isTrue="{!wrapVar.checkAttachFile}">

                                <lightning:buttonIcon  tabindex="{!wrapVar.recStudentId}" iconName="utility:upload" name="{!wrapVar.recStudentId}" variant="bare" onclick="{!c.navigateAttachFile}"/>

```
                            </aura:if>
```
```
                        </td>
```
```
                    </tr>
```
```
                </aura:iteration>
```
```
            </tbody>
```
```
        </table>
```
```
 
```
```
<br/><br/>
```
```
   
```

<div style="border:1px #ddd solid; padding:10px; background:#eee; margin:40px 0;">

```
 
```

            <p data-aura-rendered-by="435:0"><img src="https://www.w3web.net/wp-content/uploads/2021/05/thumbsUpLike.png" width="25" height="25" style="vertical-align:top; margin-right:10px;" data-aura-rendered-by="436:0"><strong data-aura-rendered-by="437:0"><span style="font-size:16px; font-style:italic; display:inline-block; margin-right:5px;">Don't forget to check out:-</span><a href="https://www.w3web.net/" target="_blank" rel="noopener noreferrer" style="text-decoration:none;" data-aura-rendered-by="440:0">An easy way to learn step-by-step online free Salesforce tutorial, To know more Click  <span style="color:#ff8000; font-size:18px;" data-aura-rendered-by="442:0">Here..</span></a></strong></p>

```
 
```
```
            <br/><br/>
```

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```
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```
```
                </div>
```

               <div style="clear:both;"></div>

```
               <br/>
```

                <div class="youtubeIcon">

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```
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</div>
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    </div>
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</aura:component>
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Step 2:- Create Lightning Component : fileAttachmentCmpConroller.js

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

fileAttachmentCmpConroller.js [JavaScript Controller]

```
   ({
```

	doInit : function(component, event, helper) {

```
 
```

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

```
 
```

        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 Component : fileAttachmentCmpHelper.js

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

fileAttachmentCmpHelper.js [JavaScript Helper File]

```
   ({
```

	refreshView : function(component, event, helper) {

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

```
 
```

        action.setCallback(this, function(response){

            var state = response.getState();

```
            //alert(state);
```
```
            if(state=='SUCCESS'){
```

                var result = response.getReturnValue();

               // alert('result ' + JSON.stringify(result));

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

```
            }
```
```
        });
```
```
        $A.enqueueAction(action);
```
```
	}
```
```
})
```

Step 4:- Create Lightning Application : wrapperCustomObjCtrCmp.apxc

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

wrapperCustomObjCtrCmp.apxc [Apex Class Controller]

   public class wrapperCustomObjCtrCmp {

```
 
```
```
    public class wrapperCustomClass{
```
```
        @AuraEnabled
```
```
        public string studentName;
```
```
        @AuraEnabled
```
```
        public string studentEmail;
```
```
        @AuraEnabled
```
```
        public string studentAddress;
```
```
        @AuraEnabled
```
```
        public Id recStudentId;
```
```
        @AuraEnabled
```

        public BOOLEAN checkAttachFile= FALSE;

```
 
```

        public wrapperCustomClass(string studentName, string studentEmail, string studentAddress, Id recStudentId,BOOLEAN checkAttachFile){

         this.studentName = studentName;

         this.studentEmail = studentEmail;

         this.studentAddress = studentAddress;

         this.recStudentId = recStudentId;

         this.checkAttachFile=checkAttachFile;

```
        }
```
```
    }
```
```
 
```
```
 
```
```
    @AuraEnabled
```

    public static List<wrapperCustomClass> appCustomWrapListMthd(){

       List<NewStudent__c> newStudent = NEW List<NewStudent__c>();

       List<wrapperCustomClass> custWrapObj = NEW  List<wrapperCustomClass>();

       List<NewStudent__c> newStudentView =[SELECT Id, Name, Email__c, Address__c FROM NewStudent__c];

```
 
```

        Map<Id,contentdocumentlink> projCheckIdDocMap = NEW Map<Id,contentdocumentlink> ();

        Set<Id> projChecklistIdSet= NEW Set<Id> ();

        FOR(NewStudent__c de: newStudentView) {

            projChecklistIdSet.add(de.Id);

```
        }
```

        List<Contentdocumentlink> listDocs = [SELECT Id,LinkedEntityId FROM contentdocumentlink WHERE LinkedEntityId IN :projChecklistIdSet

];

        FOR(Contentdocumentlink doc: listDocs) {

          projCheckIdDocMap.put(doc.LinkedEntityId, doc);

```
        }     
```
```
 
```
```
        BOOLEAN hasAttch= FALSE;
```

        FOR(NewStudent__c studentObj:newStudentView){

```
 
```

            IF(projCheckIdDocMap.get(studentObj.Id)!=NULL){

```
                hasAttch=TRUE;
```

                system.debug('hasAttch###' + hasAttch);

```
 
```
```
            }ELSE{
```
```
                 hasAttch=FALSE;
```
```
            }            
```

         custWrapObj.add(NEW wrapperCustomClass(studentObj.Name,studentObj.Email__c, studentObj.Address__c,studentObj.Id, hasAttch));

```
        }
```
```
        RETURN custWrapObj;     
```
```
    }
```
```
 }
```

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FAQ (Frequently Asked Questions)

How do you display an image in the lightning component?

To display images, use the HTML 'img' element. Include an image in your component by uploading it as a static resource or content asset.To display an icon, use the lightning:icon component, which gives you access to Salesforce Lightning Design System icons or your own custom icon.

How do I preview files in lightning component?

A lightning:fileCard component displays a preview of a file. On desktops, clicking the file preview opens the SVG file preview player, enabling you to preview images, documents, and other files in the browser. The file preview player provides quick access to file actions, such as upload, delete, download, and share.

What is lightning out?

Lightning Out is a technology where one can take Lightning components built on the Force.com platform to the external applications like Sharepoint, SAP, Node apps on Heroku and many others.