Generate field value by concatenating firstname and lastname

[clawes]

I have employee provisioning form. I want the username field to be derived by concatenating the firstname and lastname.
So when the user fills the firstname (John) and lastname (Doe), the username should default to 'john.doe'. I suspect that the dependable option is tool to do this. However, I don't know how to:

• Check that both dependable fields are filled
• Update the value of the dependent (username) field.

Thanks for your response.

[bilal-pixbit]

   Tables\Columns\TextColumn::make('name')
                ->getStateUsing(fn ($record) => $record->attendee->last_name ?  $record->attendee->first_name . ' ' . $record->attendee->last_name :  $record->attendee->first_name )
                ->searchable(),
          
                
                try this