After creating a Django Form, if one requires some or all fields of the form be filled with some initial data, one can use functionality of Django forms to do so. It is not the same as a placeholder, but this data will be passed into the view when submitted. There are multiple methods to do this, most common being to pass the data dictionary when we initialize the form in Django view. Other methods include passing initial values through form fields or overriding the __init__ method.
How to pass initial data to a Django form ?
Illustration of passing initial data using an Example. Consider a project named neveropen having an app named Lazyroar.
Refer to the following articles to check how to create a project and an app in Django.
Now let’s create a demo form in “Lazyroar/forms.py”,
from django import forms // creating a django form class GeeksForm(forms.Form): title = forms.CharField() description = forms.CharField() available = forms.BooleanField() email = forms.EmailField() |
Now to render this form we need to create the view and template which will be used to display the form to user. In Lazyroar/views.py, create a view
from django.shortcuts import render from .forms import GeeksForm # creating a home view def home_view(request): context = {} form = GeeksForm(request.POST or None) context['form'] = form return render(request, "home.html", context) |
and in templates/home.html,
<form method="POST"> {% csrf_token %} {{ form.as_p }} <input type="submit" value="Submit"> </form> |
Now let’s display the form by running
Python manage.py runserver
visit http://127.0.0.1:8000/
Method 1 – Adding initial form data in views.py
This first and most commonly used method to add initial data through a dictionary is in view.py during the initialization of a form. Here is the code of views.py with some added data.
from django.shortcuts import render from .forms import GeeksForm def home_view(request): context ={} # dictionary for initial data with # field names as keys initial_dict = { "title" : "My New Title", "description" : " A New Description", "available":True, "email":"abc@gmail.com" } # add the dictionary during initialization form = GeeksForm(request.POST or None, initial = initial_dict) context['form']= form return render(request, "home.html", context) |
Now open http://127.0.0.1:8000/. This method is senior of all and will override any data provided during other methods.
Method 2 – Adding initial form data using fields in forms.py
One can add initial data using fields in forms.py. An attribute initial is there for this purpose.
In forms.py,
from django import forms class GeeksForm(forms.Form): # adding initial data using initial attribute title = forms.CharField(initial = "Method 2 ") description = forms.CharField(initial = "Method 2 description") available = forms.BooleanField(initial = True) email = forms.EmailField(initial = "abc@gmail.com") |
Now visit, http://127.0.0.1:8000/. One can see the data being updated to method 2.
This way one can add initial data to a form in order to ease the work by a user or any related purpose. This data will be passed to models or views as defined by user and would act as normal data entered by user in the form.
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