Before creating a Lead, we will check Email, if email already exist, then we will display error message, do not allow create duplicate Lead. || we do not allow duplicate Lead, if email already exist, then we will display error message on Lead

Hey guys, today in this post we are going to learn about Write Apex Trigger Scenarios, Before creating a Lead, we will check Email, if email already exist, then we will display error message, do not allow create duplicate Lead in Salesforce.

Final Output →

Other related post that would you like to learn in Salesforce

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Create Apex Trigger →

Step 1:- Create Apex Controller : LeadTrigger.apxt

SFDX:Create Apex Trigger>> New >> LeadTrigger.apxt

LeadTrigger.apxt [Apex Trigger]

  TRIGGER LeadTrigger ON Lead (BEFORE INSERT, BEFORE UPDATE) {

```
    IF(TRIGGER.isBefore){
```
```
        IF(TRIGGER.isInsert){
```

            LeadTriggerHandler.duplicateEmailLead(TRIGGER.new);

```
        }ELSE IF(TRIGGER.isUpdate){
```

            LeadTriggerHandler.duplicateEmailLead(TRIGGER.new);

```
        }
```
```
 
```
```
    }ELSE IF(TRIGGER.isAfter){
```
```
 
```
```
    }
```
```
}
```

Create Trigger Handler Controller →

Step 2:- Create Apex Controller : LeadTriggerHandler.apxc

SFDX:Create Apex Trigger>> New >> LeadTriggerHandler.apxc

LeadTriggerHandler.apxc [Trigger Handler]

```
 
```
```
 public class LeadTriggerHandler {
```
```
 
```

    public static void duplicateEmailLead(List<Lead> leadList){

        Map<String, Lead> leadMap = NEW Map<String, Lead>();

        List<Lead> leadObjList = [SELECT Id, Name, Email FROM Lead WHERE Email !=NULL];

```
 
```
```
        FOR(Lead L1:leadObjList){
```
```
           leadMap.put(L1.Email, L1); 
```
```
        }
```
```
 
```
```
        FOR(Lead L2:leadList){
```

            IF(leadMap.containskey(L2.Email)){

               L2.addError('Do not allow duplicate Lead, this email is already exist');

```
            }
```
```
        }
```
```
 
```
```
    }
```
```
}
```

Further post that would you like to learn in Salesforce

FAQ (Frequently Asked Questions)

How to create an email to lead?

Email to Lead or Email2Lead or LeadFromEmail - creates a Lead object from an inbound email. Simply setup an EmailService for this class, setup a forward rule on your inbound sales email address to this EmailService inbound email address, that's it you are done.

How to create a lead process?

From Setup, enter Lead Process in the Quick Find box, select Lead Processes, and then click New. Select Master in the Existing Lead Process field. Enter External Contact Tracing in the Lead Process Name field. Enter a description for the process such as Process to add status to leads.

How many ways can you create a lead in Salesforce?

To create a lead in Salesforce, you can manually enter data, use a web-to-lead form, or automate with the Salesforce API. Manually, navigate to the Leads tab, click 'New', fill in the lead's details, and save. For web-to-lead, enable the feature in Setup, create a form, and embed the generated HTML on your site.

Vijay Kumar

Hi, This is Vijay Kumar behind the admin and founder of w3web.net. I am a senior software developer and working in MNC company from more than 8 years. I am great fan of technology, configuration, customization & development. Apart of this, I love to write about Blogging in spare time, Working on Mobile & Web application development, Salesforce lightning, Salesforce LWC and Salesforce Integration development in full time. [Read full bio] | | The Sitemap where you can find all published post on w3web.net