How do I make a field readonly or disabled so that it cannot be edited in Django form

0 votes

When the form is being used to create a new entry, all fields should be enabled - but when the record is in update mode some fields need to be read-only.

For example, when creating a new Item model, all fields must be editable, but while updating the record, is there a way to disable the sku field so that it is visible, but cannot be edited?

class Item(models.Model):
    sku = models.CharField(max_length=50)
    description = models.CharField(max_length=200)
    added_by = models.ForeignKey(User)


class ItemForm(ModelForm):
    class Meta:
        model = Item
        exclude = ('added_by')

def new_item_view(request):
    if request.method == 'POST':
        form = ItemForm(request.POST)
        # Validate and save
    else:
            form = ItemForm()
    # Render the view

Can class ItemForm be reused? What changes would be required in the ItemForm or Item model class? Would I need to write another class, "ItemUpdateForm", for updating the item?

def update_item_view(request):
    if request.method == 'POST':
        form = ItemUpdateForm(request.POST)
        # Validate and save
    else:
        form = ItemUpdateForm()

In a Django form, how do I make a field read-only (or disabled)?

Aug 6, 2020 in Python by kartik
• 37,520 points
16,678 views

1 answer to this question.

0 votes

Hello @kartik,

Setting readonly on a widget only makes the input in the browser read-only. Adding a clean_sku which returns instance.sku ensures the field value will not change on form level.

def clean_sku(self):
    if self.instance: 
        return self.instance.sku
    else: 
        return self.fields['sku']

This way you can use model's (unmodified save) and avoid getting the field required error.

Hope it helps!!

Thank you!!

answered Aug 6, 2020 by Niroj
• 82,840 points

Related Questions In Python

0 votes
1 answer

How can I raise an exception in Python so that it can later be caught via an except block?

It's pretty simple to raise a query  raise ...READ MORE

answered May 29, 2019 in Python by Umesh
985 views
0 votes
1 answer

How do I use urllib to see if a website is 404 or 200 in Python?

For Python 3, try doing this: import urllib.request, ...READ MORE

answered Nov 29, 2018 in Python by Nymeria
• 3,560 points

edited Dec 11, 2018 by Nymeria 14,058 views
0 votes
1 answer

How do I check if input string is a valid regular expression or not in Python?

Hi. Good question! Well, just like what ...READ MORE

answered Feb 12, 2019 in Python by Nymeria
• 3,560 points
11,316 views
0 votes
1 answer
0 votes
1 answer

How to temporarily disable a foreign key constraint in MySQL?

Hello @kartik, To turn off foreign key constraint ...READ MORE

answered Jun 23, 2020 in Python by Niroj
• 82,840 points
2,507 views
0 votes
1 answer

How do I use Django templates without the rest of Django?

Hello @kartik, Let's say you have this important ...READ MORE

answered Jun 23, 2020 in Python by Niroj
• 82,840 points
1,586 views
0 votes
1 answer
+1 vote
1 answer

How do I create a slug in Django?

Hello @kartik, You will need to use the ...READ MORE

answered Jun 26, 2020 in Python by Niroj
• 82,840 points
1,277 views
webinar REGISTER FOR FREE WEBINAR X
REGISTER NOW
webinar_success Thank you for registering Join Edureka Meetup community for 100+ Free Webinars each month JOIN MEETUP GROUP