How to Retrieve DjangoForm Data Complete Guide | Django Tutorials

Retrieve DjangoForm Data copy
Django Django Forms Django Tutorials

How to Retrieve DjangoForm Data Complete Guide | Django Tutorials

How to Retrieve DjangoForm Data | Django Tutorials

In this Django tutorial for beginners series, we are going to learn how to Retrieve DjangoForm data. When the user fills the website form, that data is validated at first if the developer enables validation on the form fields. After checking form validation, user input data is sent to website database tables. The developer retrieves that data from the database for different purposes as they need. To retrieve DjangForm data is very simple and easy because there are different ways you can follow to retrieve data just need to understand and learn.
There are different ways, we will discuss in this tutorial. If you don’t know about the basics of DjangoForm then you need to learn first what is the form in Django, its fields, how to validate a field, etc. All this related information, you should need to learn. With that lessons, you should learn to retrieve data from DjagnoForm data.

Methods to Retrieve DjangoForm Data

You know, Django is a Python-based web framework that has built-in functions, modules that work for different functionalities. We did not need to write pure coding in order to get the required functionality. So retrieving DjangoForm data has different techniques provided by Django. We will discuss mostly used techniques that used to retrieve data from Form fields.
One way: form.cleaned_data.get(“form_field_name”) 
2nd way: form.cleaned_data[“form_field_name”] 
3rd way: form.instance.form_field_name
4th way: form[‘form_field_name’].value()
5th way:[‘form_field_name’]
The difference between cleaned_data and cleaned_data.get in Django is that if you did not provide a key in the dictionary, then self.cleaned_data[‘field’] will raise a KeyError, but self.cleaned_data.get(‘field’) will return None if you did not give key. Some time form.cleaned_data.get() used to provide default value when data is empty.

Example to Retrieve DjangoForm Data

The following exmaple is very helpful for you because we have used 5 methods to get value from Django form field. You can use anyone of them, it depends upon sutiatiosn and your needs. So let’s start to learn!

def std_register(request):
    if request.method == “POST”:
        form = CreateUserForm(request.POST)
        if form.is_valid():
            username = form.cleaned_data[‘username’]
            # username = form.cleaned_data.get(‘username’)
            # username = form.instance.username
            # username = form[‘username’].value()
            # username =[‘username’]
            # The above 4 line of code are used to get data from the input feild in differetn style. Just need to uncomment the above line
            messages.success(request, ‘Your account is created ‘+username)
            return redirect(‘login’)
        form = CreateUserForm()
    context = {‘form’:form}
    return render(request, ‘users/std_register.html’, context)

We have discussed that how to get data from HTML form in Django in different ways depending upon the situation or your needs.

For example, you have designed a form for students, in which the student will enter his/her required details. A student can input a name, father name, email, address, phone number, subject, etc. All this information will be store in the database when the user clicks on the submit button.

After saving it to the database, you can retrieve that data from the database to display on the web page. For example, you want to retrieve that student who has passed in their exam or who are in a Computer science subject. So displaying record from database to web page to show users, it is called retrieving of data. So we can also perform other operations also like delete and update records. All these operations can be done with Django.


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