How can I make a Django form field contain only alphanumeric characters

Question

I have this model

name = models.CharField(max_length=50, blank=True, null=True)
email = models.EmailField(max_length=50, unique=True)

I want that the user should not be able to use any other characters than alphanumerics in both fields.

Is there any way?

Asked By: user1958218

||

Source

Answer 1

You would use a validator to limit what the field accepts. A RegexValidator would do the trick here:

from django.core.validators import RegexValidator

alphanumeric = RegexValidator(r'^[0-9a-zA-Z]*$', 'Only alphanumeric characters are allowed.')

name = models.CharField(max_length=50, blank=True, null=True, validators=[alphanumeric])
email = models.EmailField(max_length=50, unique=True, validators=[alphanumeric])

Note that there already is a validate_email validator that’ll validate email addresses for you; the alphanumeric validator above will not allow for valid email addresses.

Answered By: Martijn Pieters

Answer 2

Instead of RegexValidator, give validation in forms attributes only like…

        class StaffDetailsForm(forms.ModelForm):
             first_name = forms.CharField(required=True,widget=forms.TextInput(attrs={'class':'form-control' , 'autocomplete': 'off','pattern':'[A-Za-z ]+', 'title':'Enter Characters Only '}))

and so on…

Else you will have to handle the error in views.
It worked for me try this simple method…
This will allow users to enter only Alphabets and Spaces only

Answered By: Javed

Answer 3

That is little bit wider than you want, but you also can use SlugField:

A Slug is basically a short label for something, containing only
letters, numbers, underscores or hyphens. They’re generally used in
URLs. For example, in a typical blog entry URL:
https://www.geeksforgeeks.org/add-the-slug-field-inside-django-model/

field_name = models.SlugField(max_length=200, **options)

Answered By: rzlvmp

Answer 4

email validation using django form
with danish special characters also

import re

email_regex = r'b[A-Za-z0-9._%+-øØæÆåÅ]+@[A-Za-z0-9.-øØæÆåÅ]+.[A-Z|a-z]{2,}b'

if email and not re.search(email_regex, email):
    raise forms.ValidationError({"email": "Enter a valid email"})

Answered By: rambo_gt_r

Answer 5

You can make use of builtin string isalnum function to check whether input is alphanumeric or not.

def alphanumeric(value):
    if not str(value).isalnum():
        raise ValueError("Name can have number or character no special characters")


name = models.CharField(max_length=100, blank=True, null=True, validators=[alphanumeric])

Answered By: Lohith

How can I make a Django form field contain only alphanumeric characters

Question:

Answers: