How can I create custom fields in Django forms?

How can I create custom fields in Django forms?

You can create custom fields in Django forms by subclassing the existing field classes. What type of custom field do you need?

I want to create a field that validates a specific format for phone numbers.

You can create a custom field by subclassing CharField and overriding the clean method to add your validation logic.

Can you show me an example of that?

Sure! Here's a simple example:

from django import forms
import re

class PhoneNumberField(forms.CharField):
    def clean(self, value):
        value = super().clean(value)
        if not re.match(r'^\+?1?\d{9,15}$', value):
            raise forms.ValidationError('Invalid phone number format.')
        return value