Django Form Validation

Django provides built-in methods to validate form data automatically. Django forms submit only if it contains CSRF tokens. It uses uses a clean and easy approach to validate data.

The is_valid() method is used to perform validation for each field of the form, it is defined in Django Form class. It returns True if data is valid and place all data into a cleaned_data attribute.

Let’s see an example that takes user input and validate input as well.

Django Validation Example

This example contains the following files and code.

// models.py

from django.db import models  

class Employee(models.Model):  

    eid = models.CharField(max_length=20)  

    ename = models.CharField(max_length=100)  

    econtact = models.CharField(max_length=15)  

    class Meta:  

        db_table = "employee" 

Now, create a form which contains the below code.

// forms.py

from django import forms  

from myapp.models import Employee  

  

class EmployeeForm(forms.ModelForm):  

    class Meta:  

        model = Employee  

        fields = "__all__"  

Instantiate the form

Instantiate the form, check whether request is post or not. It validate the data by using is_valid() method.

//views.py

def emp(request):  

    if request.method == "POST":  

        form = EmployeeForm(request.POST)  

        if form.is_valid():  

            try:  

                return redirect('/')  

            except:  

                pass  

    else:  

        form = EmployeeForm()  

    return render(request,'index.html',{'form':form}) 

Index template that shows form and errors.

// index.html

Start server and access the form.

It validates each field and throws errors if any validation fails.