Django views.py：无法在 function 之外使用变量

Question

I want a new page to open when a django form is filled- by hitting enter/by clicking on the 'Search' input and display results in that page using the data entered in the form.

forms.py:

class SearchBar(forms.Form):
    Search = forms.CharField(label='', max_length=100, widget=forms.TextInput)

The HTML page with the form looks like:

index.html

<form class="" action="result" method="post">
          
          {% csrf_token %}
          {{ form1.as_table }}

          <input class="Search" type="submit" name="" value="Search">

</form>

I want the submission of this form to open a new page: result.html

I have set the url of 'result' to the said HTML page:

urls.py

urlpatterns=[
    path('result', views.result, name='result'),
]

I have extracted the data entered in the from by form1.cleaned_data['Search'] .

form_input=form1.cleaned_data['Search']

However, once the result page is opened, it shows that the data (form_input) is not defined. The following error is shown:

name 'form_input' is not defined

I am unable to use this data (form_input) in any other function of the views.py file.

views.py

def index(request):
    form1 = forms.SearchBar()
    if request.method == "POST":
        form1 = forms.SearchBar(request.POST)
        if form1.is_valid():
            global form_input
            form_input= (form1.cleaned_data['Search'])

def result(request):
    print(form_input)

I don't understand why this is happening. I have even declared the variable form_input as a global variable.

Answer 1

You will have to do something like this:

views.py

from . forms import SearchBar

def search_view(request):
    if request.method == "POST":
        form = SearchBar(request.POST)
        if form.is_valid():
            form_input = form.cleaned_data['Search']
            search_result = # your search query using the form_input variable
            return render(request, "result.html", {"search_result ": search_result })

If I understand corectly you would like to have your search bar in the base.html (base template that all other templates inherit from) then where your search bar in the template would be write something like this:

<form action={% url 'search_view' %} method="post">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit">Search</button>
</form>

And the result.html would look like this:

{% for item in search_result %}
    {{ i.name }}
{% endfor %}

UPDATE

Well, obviously the purpose of a search bar is to filter and display objects of a given model/models, for example if you had a User model:

class User(models.Model):
    name = models.CharField(max_length=50)
    is_active = models.BooleanField(default=True)

and wanted to filter objects based on your user.name then the the line of code would look something like this:

search_results = User.objects.filter(name__contains=form_input)

So that if you had for example 3 users with names like Tom Jablinski , Tommy Joe and Jack White (for example) and searched for Tom you would get a queryset containing 2 user objects: Tom Jablinski and Tommy Joe and they would be displayed in result.html temaplte.