How to display/show an error message at the respective field through trigger salesforce? - Salesforce Globe For You

 How to display/show an error message at the respective field through trigger salesforce?  - Salesforce Globe For You 

Problem: Assume while inserting Lead record,in case if Email field of Lead is empty ,need to display an error Message 'Please Enter Email' below the Email field itself.

Solution: use addError() method at it's respective record field to display Error message like this objLead.Email.addError('Please Enter Email'); where Email is field where error message to be displayed.

Example:

trigger ErrorMessageAtFieldLevel on Lead (before insert) {

    for(Lead objLead :trigger.new) {

        if(String.isBlank(objLead.Email)) {

            objLead.Email.addError('Please Enter Email');

        }

    }

}

Output: when you try creating a new Lead record without entering Email,it will through an error message at the Email field as shown below.