CODEWITHSUNDEEP
pythondjango
user1958218
user1958218

Reputation: 1621

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

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?

Upvotes: 46

Views: 38472

Answers (5)

Lohith
Lohith

Reputation: 934

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])

Upvotes: 1

rambo_gt_r
rambo_gt_r

Reputation: 9

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"})

Upvotes: 0

rzlvmp
rzlvmp

Reputation: 9364

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)

Upvotes: 2

Martijn Pieters
Martijn Pieters

Reputation: 1121992

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.

Upvotes: 106

Javed
Javed

Reputation: 1753

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

Upvotes: 2

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