How can I implement form validation in Django?

How can I implement form validation in Django?

In Django, you can implement form validation by using the built-in form classes. You can define your fields and add validation methods.

Can you show me an example of a custom validation method?

Sure! You can create a custom validation method by defining a method in your form class. For example:

from django import forms

class MyForm(forms.Form):
    name = forms.CharField(max_length=100)

    def clean_name(self):
        name = self.cleaned_data.get('name')
        if 'badword' in name:
            raise forms.ValidationError('Inappropriate word used!')
        return name

What about validating email fields?

Django provides an EmailField that automatically validates email addresses. You can use it like this:

email = forms.EmailField()

How do I display validation errors in my template?

You can display validation errors in your template by iterating over the form's errors. For example:

{% for field in form %}
    {{ field.label }}: {{ field }}
    {% for error in field.errors %}
        <div class="error">{{ error }}</div>
    {% endfor %}
{% endfor %}