Initial form data – Django Forms

29 Dec, 2019
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.
Illustration of passing initial data using an Example. Consider a project named geeksforgeeks having an app named geeks.
Refer to the following articles to check how to create a project and an app in Django.
How to Create a Basic Project using MVT in Django?
How to Create an App in Django ?
Now let’s create a demo form in “geeks/forms.py”,
from django import forms  // creating a django formclass 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 geeks/views.py, create a view
from django.shortcuts import renderfrom .forms import GeeksForm  # creating a home viewdef 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/
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 renderfrom .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.
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.
Django-forms
Python Django
Python
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