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Django Bootstrap Modal Forms

A Django plugin for creating AJAX driven forms in Bootstrap modal.

Live Demo

Demo

Installation

  1. Install django-bootstrap-modal-forms:

    $ pip install django-bootstrap-modal-forms

  2. Add bootstrap_modal_forms to your INSTALLED_APPS in settings.py:

    INSTALLED_APPS = [
    ...
    'bootstrap_modal_forms',
    ...
]

  3. Include Bootstrap, jQuery and jquery.bootstrap.modal.forms.js on every page where you would like to set up the AJAX driven Django forms in Bootstrap modal.

IMPORTANT: Adjust Bootstrap and jQuery file paths to match yours, but include jquery.bootstrap.modal.forms.js exactly as in code bellow.

<head>
    <link rel="stylesheet" href="{% static 'assets/css/bootstrap.css' %}">
</head>

<body>
    <script src="{% static 'assets/js/bootstrap.js' %}"></script>

    <!-- Bootstrap 4 -->
    <script src="{% static 'assets/js/jquery.js' %}"></script>
    <script src="{% static 'js/jquery.bootstrap.modal.forms.js' %}"></script>
    <!-- You can alternatively load the minified version -->
    <script src="{% static 'js/jquery.bootstrap.modal.forms.min.js' %}"></script>

    <!-- Bootstrap 5 -->
    <script src="{% static 'js/bootstrap5.modal.forms.js' %}"></script>
    <!-- You can alternatively load the minified version -->
    <script src="{% static 'js/bootstrap5.modal.forms.min.js' %}"></script>
</body>

How it works?

index.html

<script type="text/javascript">

// BS4
$(document).ready(function() {
    $("#create-book").modalForm({
        formURL: "{% url 'create_book' %}"
    });
});

// BS5
document.addEventListener('DOMContentLoaded', (e) => {
  modalForm(document.getElementById('create-book'), {
    formURL: "{% url 'create_book' %}"
  })
});

</script>
  1. Click event on html element instantiated with modalForm opens modal
  2. Form at formURL is appended to the modal
  3. On submit the form is POSTed via AJAX request to formURL
  4. Unsuccessful POST request returns errors, which are shown in modal
  5. Successful POST request submits the form and redirects to success_url and shows success_message, which are both defined in related Django view

Usage

1. Form

Define BookModelForm and inherit built-in form BSModalModelForm.

forms.py

from .models import Book
from bootstrap_modal_forms.forms import BSModalModelForm

class BookModelForm(BSModalModelForm):
    class Meta:
        model = Book
        fields = ['title', 'author', 'price']

2. Form's html

Define form's html and save it as Django template.

  • Bootstrap 4 modal elements are used in this example.
  • Form will POST to formURL defined in #6.
  • Add class="invalid" or custom errorClass (see paragraph Options) to the elements that wrap the fields.
  • class="invalid" acts as a flag for the fields having errors after the form has been POSTed.
book/create_book.html

<form method="post" action="">
  {% csrf_token %}

 <div class="modal-header">
    <h5 class="modal-title">Create new Book</h5>
    <button type="button" class="close" data-dismiss="modal" aria-label="Close">
      <span aria-hidden="true">&times;</span>
    </button>
  </div>

  <div class="modal-body">
    {% for field in form %}
      <div class="form-group{% if field.errors %} invalid{% endif %}">
        <label for="{{ field.id_for_label }}">{{ field.label }}</label>
        {{ field }}
        {% for error in field.errors %}
          <p class="help-block">{{ error }}</p>
        {% endfor %}
      </div>
    {% endfor %}
  </div>

  <div class="modal-footer">
    <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
    <button type="submit" class="btn btn-primary">Create</button>
  </div>

</form>

3. Class-based view

Define a class-based view BookCreateView and inherit from built-in generic view BSModalCreateView. BookCreateView processes the form defined in #1, uses the template defined in #2 and redirects to success_url showing success_message.

views.py

from django.urls import reverse_lazy
from .forms import BookModelForm
from .models import Book
from bootstrap_modal_forms.generic import BSModalCreateView

class BookCreateView(BSModalCreateView):
    template_name = 'examples/create_book.html'
    form_class = BookModelForm
    success_message = 'Success: Book was created.'
    success_url = reverse_lazy('index')

4. URL for the view

Define URL for the view in #3.

from django.urls import path
from books import views

urlpatterns = [
    path('', views.Index.as_view(), name='index'),
    path('create/', views.BookCreateView.as_view(), name='create_book'),
]

5. Bootstrap modal and trigger element

Define the Bootstrap modal window and html element triggering modal opening.

  • Single modal can be used for multiple modalForms in single template (see #6).
  • When using multiple modals on the same page each modal should have unique id and the same value should also be set as modalID option when instantiating modalForm on trigger element.
  • Trigger element (in this example button with id="create-book") is used for instantiation of modalForm in #6.
  • Any element can be trigger element as long as modalForm is bound to it.
  • Click event on trigger element loads form's html from #2 within <div class="modal-content"></div> and sets action attribute of the form to formURL set in #6.
index.html

<div class="modal fade" tabindex="-1" role="dialog" id="modal">
  <div class="modal-dialog" role="document">
    <div class="modal-content"></div>
  </div>
</div>

<!-- Create book button -->
<button id="create-book" class="btn btn-primary" type="button" name="button">Create book</button>

6. modalForm

Add script to the template from #5 and bind the modalForm to the trigger element. Set BookCreateView URL defined in #4 as formURL property of modalForm.

  • If you want to create more modalForms in single template using the single modal window from #5, repeat steps #1 to #4, create new trigger element as in #5 and bind the new modalForm with unique URL to it.
  • Default values for modalID, modalContent, modalForm and errorClass are used in this example, while formURL is customized. If you customize any other option adjust the code of the above examples accordingly.
index.html

<script type="text/javascript">

// BS4
$(document).ready(function() {
    $("#create-book").modalForm({
        formURL: "{% url 'create_book' %}"
    });
});

// BS5
document.addEventListener('DOMContentLoaded', (e) => {
  modalForm(document.getElementById('create-book'), {
    formURL: "{% url 'create_book' %}"
  })
});

</script>

Async create/update with or without modal closing on submit

Set asyncUpdate and asyncSettings settings to create or update objects without page redirection to successUrl and define whether a modal should close or stay opened after form submission. See comments in example below and paragraph modalForm options for explanation of asyncSettings. See examples on how to properly reinstantiate modal forms for all CRUD buttons when using async options.

index.html

<!-- asyncSettings.dataElementId -->
<table id="books-table" class="table">
  <thead>
    ...
  </thead>
  <tbody>
  {% for book in books %}
    <tr>
        ...
        <!-- Update book buttons -->
        <button type="button" class="update-book btn btn-sm btn-primary" data-form-url="{% url 'update_book' book.pk %}">
          <span class="fa fa-pencil"></span>
        </button>
        ...
      </td>
    </tr>
  {% endfor %}
  </tbody>
</table>

<script type="text/javascript">
    $(function () {
        ...

        # asyncSettings.successMessage
        var asyncSuccessMessage = [
          "<div ",
          "style='position:fixed;top:0;z-index:10000;width:100%;border-radius:0;' ",
          "class='alert alert-icon alert-success alert-dismissible fade show mb-0' role='alert'>",
          "Success: Book was updated.",
          "<button type='button' class='close' data-dismiss='alert' aria-label='Close'>",
          "<span aria-hidden='true'>&times;</span>",
          "</button>",
          "</div>",
          "<script>",
          "$('.alert').fadeTo(2000, 500).slideUp(500, function () {$('.alert').slideUp(500).remove();});",
          "<\/script>"
        ].join();

        # asyncSettings.addModalFormFunction
        function updateBookModalForm() {
          $(".update-book").each(function () {
            $(this).modalForm({
              formURL: $(this).data("form-url"),
              asyncUpdate: true,
              asyncSettings: {
                closeOnSubmit: false,
                successMessage: asyncSuccessMessage
                dataUrl: "books/",
                dataElementId: "#books-table",
                dataKey: "table",
                addModalFormFunction: updateBookModalForm
              }
            });
          });
        }
        updateBookModalForm();

        ...
    });
</script>
urls.py

from django.urls import path
from . import views

urlpatterns = [
    ...
    # asyncSettings.dataUrl
    path('books/', views.books, name='books'),
    ...
]
views.py

from django.http import JsonResponse
from django.template.loader import render_to_string
from .models import Book

def books(request):
    data = dict()
    if request.method == 'GET':
        books = Book.objects.all()
        # asyncSettings.dataKey = 'table'
        data['table'] = render_to_string(
            '_books_table.html',
            {'books': books},
            request=request
        )
        return JsonResponse(data)

modalForm options

modalID
Sets the custom id of the modal. Default: "#modal"
modalContent
Sets the custom class of the element to which the form's html is appended. If you change modalContent to the custom class, you should also change modalForm accordingly. To keep Bootstrap's modal style you should than copy Bootstrap's style for modal-content and set it to your new modalContent class. Default: ".modal-content"
modalForm
Sets the custom form selector. Default: ".modal-content form"
formURL
Sets the url of the form's view and html. Default: null
isDeleteForm
Defines if form is used for deletion. Should be set to true for deletion forms. Default: false
errorClass
Sets the custom class for the form fields having errors. Default: ".invalid"
asyncUpdate
Sets asynchronous content update after form submission. Default: false
asyncSettings.closeOnSubmit
Sets whether modal closes or not after form submission. Default: false
asyncSettings.successMessage
Sets successMessage shown after succesful for submission. Should be set to string defining message element. See asyncSuccessMessage example above. Default: null
asyncSettings.dataUrl
Sets url of the view returning new queryset = all of the objects plus newly created or updated one after asynchronous update. Default: null
asyncSettings.dataElementId
Sets the id of the element which rerenders asynchronously updated queryset. Default: null
asyncSettings.dataKey
Sets the key containing asynchronously updated queryset in the data dictionary returned from the view providing updated queryset. Default: null
asyncSettings.addModalFormFunction
Sets the method needed for reinstantiation of event listeners on buttons (single or all CRUD buttons) after asynchronous update. Default: null

modalForm default settings object and it's structure

triggerElement.modalForm({
    modalID: "#modal",
    modalContent: ".modal-content",
    modalForm: ".modal-content form",
    formURL: null,
    isDeleteForm: false,
    errorClass: ".invalid",
    asyncUpdate: false,
    asyncSettings: {
        closeOnSubmit: false,
        successMessage: null,
        dataUrl: null,
        dataElementId: null,
        dataKey: null,
        addModalFormFunction: null
    }
});

Forms

Import forms with from bootstrap_modal_forms.forms import BSModalForm.

BSModalForm
Inherits PopRequestMixin and Django's forms.Form.
BSModalModelForm
Inherits PopRequestMixin, CreateUpdateAjaxMixin and Django's forms.ModelForm.

Mixins

Import mixins with from bootstrap_modal_forms.mixins import PassRequestMixin.

PassRequestMixin
Puts the request into the form's kwargs.
PopRequestMixin
Pops request out of the kwargs and attaches it to the form's instance.
CreateUpdateAjaxMixin
Saves or doesn't save the object based on the request type.
DeleteMessageMixin
Deletes object if request is not ajax request.
LoginAjaxMixin
Authenticates user if request is not ajax request.

Generic views

Import generic views with from bootstrap_modal_forms.generic import BSModalFormView.

BSModalFormView
Inherits PassRequestMixin and Django's generic.FormView.
BSModalCreateView
Inherits PassRequestMixin and Django's SuccessMessageMixin and generic.CreateView.
BSModalUpdateView
Inherits PassRequestMixin and Django's SuccessMessageMixin and generic.UpdateView.
BSModalReadView
Inherits Django's generic.DetailView.
BSModalDeleteView
Inherits DeleteMessageMixin and Django's generic.DeleteView.

Examples

To see django-bootstrap-modal-forms in action clone the repository and run the examples locally:

$ git clone https://github.com/trco/django-bootstrap-modal-forms.git
$ cd django-bootstrap-modal-forms
$ pip install -r requirements.txt
$ python manage.py migrate
$ python manage.py runserver

Tests

Run unit and functional tests inside of project folder:

$ python manage.py test

Example 1: Signup form in Bootstrap modal

For explanation how all the parts of the code work together see paragraph Usage. To test the working solution presented here clone and run Examples.

forms.py

from django.contrib.auth.forms import UserCreationForm
from django.contrib.auth.models import User
from bootstrap_modal_forms.mixins import PopRequestMixin, CreateUpdateAjaxMixin


class CustomUserCreationForm(PopRequestMixin, CreateUpdateAjaxMixin,
                             UserCreationForm):
    class Meta:
        model = User
        fields = ['username', 'password1', 'password2']
signup.html

{% load widget_tweaks %}

<form method="post" action="">
  {% csrf_token %}

  <div class="modal-header">
    <h3 class="modal-title">Sign up</h3>
    <button type="button" class="close" data-dismiss="modal" aria-label="Close">
      <span aria-hidden="true">&times;</span>
    </button>
  </div>

  <div class="modal-body">

    <div class="{% if form.non_field_errors %}invalid{% endif %} mb-2">
      {% for error in form.non_field_errors %}
        {{ error }}
      {% endfor %}
    </div>

    {% for field in form %}
      <div class="form-group">
        <label for="{{ field.id_for_label }}">{{ field.label }}</label>
        {% render_field field class="form-control" placeholder=field.label %}
        <div class="{% if field.errors %} invalid{% endif %}">
          {% for error in field.errors %}
            <p class="help-block">{{ error }}</p>
          {% endfor %}
        </div>
      </div>
    {% endfor %}
  </div>

  <div class="modal-footer">
    <button type="submit" class="btn btn-primary">Sign up</button>
  </div>

</form>
views.py

from django.urls import reverse_lazy
from bootstrap_modal_forms.generic import BSModalCreateView
from .forms import CustomUserCreationForm

class SignUpView(BSModalCreateView):
    form_class = CustomUserCreationForm
    template_name = 'examples/signup.html'
    success_message = 'Success: Sign up succeeded. You can now Log in.'
    success_url = reverse_lazy('index')
urls.py

from django.urls import path
from . import views

app_name = 'accounts'
urlpatterns = [
    path('signup/', views.SignUpView.as_view(), name='signup')
]
.html file containing modal, trigger element and script instantiating modalForm

<div class="modal fade" tabindex="-1" role="dialog" id="modal">
  <div class="modal-dialog" role="document">
    <div class="modal-content"></div>
  </div>
</div>

<button id="signup-btn" class="btn btn-primary" type="button" name="button">Sign up</button>

<script type="text/javascript">
  $(function () {
    // Sign up button
    $("#signup-btn").modalForm({
        formURL: "{% url 'signup' %}"
    });
  });
</script>

Example 2: Login form in Bootstrap modal

For explanation how all the parts of the code work together see paragraph Usage. To test the working solution presented here clone and run Examples.

You can set the login redirection by setting the LOGIN_REDIRECT_URL in settings.py.

You can also set the custom login redirection by:

  1. Adding success_url to the extra_context of CustomLoginView
  2. Setting this success_url variable as a value of the hidden input field with name="next" within the Login form html
forms.py

from django.contrib.auth.forms import AuthenticationForm
from django.contrib.auth.models import User

class CustomAuthenticationForm(AuthenticationForm):
    class Meta:
        model = User
        fields = ['username', 'password']
login.html

{% load widget_tweaks %}

<form method="post" action="">
  {% csrf_token %}

  <div class="modal-header">
    <h3 class="modal-title">Log in</h3>
    <button type="button" class="close" data-dismiss="modal" aria-label="Close">
      <span aria-hidden="true">&times;</span>
    </button>
  </div>

  <div class="modal-body">

    <div class="{% if form.non_field_errors %}invalid{% endif %} mb-2">
      {% for error in form.non_field_errors %}
        {{ error }}
      {% endfor %}
    </div>

    {% for field in form %}
      <div class="form-group">
        <label for="{{ field.id_for_label }}">{{ field.label }}</label>
        {% render_field field class="form-control" placeholder=field.label %}
        <div class="{% if field.errors %} invalid{% endif %}">
          {% for error in field.errors %}
            <p class="help-block">{{ error }}</p>
          {% endfor %}
        </div>
      </div>
    {% endfor %}

    <!-- Hidden input field for custom redirection after successful login -->
    <input type="hidden" name="next" value="{{ success_url }}">
  </div>

  <div class="modal-footer">
    <button type="submit" class="btn btn-primary">Log in</button>
  </div>

</form>
views.py

from django.urls import reverse_lazy
from bootstrap_modal_forms.generic import BSModalLoginView
from .forms import CustomAuthenticationForm

class CustomLoginView(BSModalLoginView):
    authentication_form = CustomAuthenticationForm
    template_name = 'examples/login.html'
    success_message = 'Success: You were successfully logged in.'
    extra_context = dict(success_url=reverse_lazy('index'))
urls.py

from django.urls import path
from . import views

app_name = 'accounts'
urlpatterns = [
    path('login/', views.CustomLoginView.as_view(), name='login')
]
.html file containing modal, trigger element and script instantiating modalForm

<div class="modal fade" tabindex="-1" role="dialog" id="modal">
  <div class="modal-dialog" role="document">
    <div class="modal-content"></div>
  </div>
</div>

<button id="login-btn" class="btn btn-primary" type="button" name="button">Sign up</button>

<script type="text/javascript">
  $(function () {
    // Log in button
    $("#login-btn").modalForm({
        formURL: "{% url 'login' %}"
    });
  });
</script>

Example 3: Django's forms.ModelForm (CRUD forms) in Bootstrap modal

For explanation how all the parts of the code work together see paragraph Usage. To test the working solution presented here clone and run Examples.

forms.py

from .models import Book
from bootstrap_modal_forms.forms import BSModalModelForm


class BookModelForm(BSModalModelForm):
    class Meta:
        model = Book
        exclude = ['timestamp']
create_book.html

{% load widget_tweaks %}

<form method="post" action="">
  {% csrf_token %}

  <div class="modal-header">
    <h3 class="modal-title">Create Book</h3>
    <button type="button" class="close" data-dismiss="modal" aria-label="Close">
      <span aria-hidden="true">&times;</span>
    </button>
  </div>

  <div class="modal-body">

    <div class="{% if form.non_field_errors %}invalid{% endif %} mb-2">
      {% for error in form.non_field_errors %}
        {{ error }}
      {% endfor %}
    </div>

    {% for field in form %}
      <div class="form-group">
        <label for="{{ field.id_for_label }}">{{ field.label }}</label>
        {% render_field field class="form-control" placeholder=field.label %}
        <div class="{% if field.errors %} invalid{% endif %}">
          {% for error in field.errors %}
            <p class="help-block">{{ error }}</p>
          {% endfor %}
        </div>
      </div>
    {% endfor %}
  </div>

  <div class="modal-footer">
    <button type="submit" class="btn btn-primary">Create</button>
  </div>

</form>
update_book.html

{% load widget_tweaks %}

<form method="post" action="">
  {% csrf_token %}

  <div class="modal-header">
    <h3 class="modal-title">Update Book</h3>
    <button type="button" class="close" data-dismiss="modal" aria-label="Close">
      <span aria-hidden="true">&times;</span>
    </button>
  </div>

  <div class="modal-body">
    <div class="{% if form.non_field_errors %}invalid{% endif %} mb-2">
      {% for error in form.non_field_errors %}
        {{ error }}
      {% endfor %}
    </div>

    {% for field in form %}
      <div class="form-group">
        <label for="{{ field.id_for_label }}">{{ field.label }}</label>
        {% render_field field class="form-control" placeholder=field.label %}
        <div class="{% if field.errors %} invalid{% endif %}">
          {% for error in field.errors %}
            <p class="help-block">{{ error }}</p>
          {% endfor %}
        </div>
      </div>
    {% endfor %}
  </div>

  <div class="modal-footer">
    <button type="submit" class="btn btn-primary">Update</button>
  </div>

</form>
read_book.html

{% load widget_tweaks %}

<div class="modal-header">
  <h3 class="modal-title">Book details</h3>
  <button type="button" class="close" data-dismiss="modal" aria-label="Close">
    <span aria-hidden="true">&times;</span>
  </button>
</div>

<div class="modal-body">
  <div class="">
    Title: {{ book.title }}
  </div>
  <div class="">
    Author: {{ book.author }}
  </div>
  <div class="">
    Price: {{ book.price }} €
  </div>
</div>

<div class="modal-footer">
  <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
{% load widget_tweaks %}

<form method="post" action="">
  {% csrf_token %}

  <div class="modal-header">
    <h3 class="modal-title">Delete Book</h3>
    <button type="button" class="close" data-dismiss="modal" aria-label="Close">
      <span aria-hidden="true">&times;</span>
    </button>
  </div>

  <div class="modal-body">
    <p>Are you sure you want to delete book with title
      <strong>{{ book.title }}</strong>?</p>
  </div>

  <div class="modal-footer">
    <button type="submit" class="btn btn-danger">Delete</button>
  </div>

</form>
views.py

from django.urls import reverse_lazy
from django.views import generic
from .forms import BookModelForm
from .models import Book
from bootstrap_modal_forms.generic import (
  BSModalCreateView,
  BSModalUpdateView,
  BSModalReadView,
  BSModalDeleteView
)

class Index(generic.ListView):
    model = Book
    context_object_name = 'books'
    template_name = 'index.html'

# Create
class BookCreateView(BSModalCreateView):
    template_name = 'examples/create_book.html'
    form_class = BookModelForm
    success_message = 'Success: Book was created.'
    success_url = reverse_lazy('index')

# Update
class BookUpdateView(BSModalUpdateView):
    model = Book
    template_name = 'examples/update_book.html'
    form_class = BookModelForm
    success_message = 'Success: Book was updated.'
    success_url = reverse_lazy('index')

# Read
class BookReadView(BSModalReadView):
    model = Book
    template_name = 'examples/read_book.html'

# Delete
class BookDeleteView(BSModalDeleteView):
    model = Book
    template_name = 'examples/delete_book.html'
    success_message = 'Success: Book was deleted.'
    success_url = reverse_lazy('index')
urls.py

from django.urls import path
from books import views

urlpatterns = [
    path('', views.Index.as_view(), name='index'),
    path('create/', views.BookCreateView.as_view(), name='create_book'),
    path('update/<int:pk>', views.BookUpdateView.as_view(), name='update_book'),
    path('read/<int:pk>', views.BookReadView.as_view(), name='read_book'),
    path('delete/<int:pk>', views.BookDeleteView.as_view(), name='delete_book')
]
.html file containing modal, trigger elements and script instantiating modalForms

<!-- Modal 1 with id="create-book"-->
<div class="modal fade" id="create-modal" tabindex="-1" role="dialog" aria-hidden="true">
  <div class="modal-dialog">
    <div class="modal-content">
    </div>
  </div>
</div>

<!-- Modal 2 with id="modal" -->
<div class="modal fade" tabindex="-1" role="dialog" id="modal">
  <div class="modal-dialog" role="document">
    <div class="modal-content"></div>
  </div>
</div>

<!-- Create book button -->
<button id="create-book" class="btn btn-primary" type="button" name="button">Create book</button>

{% for book in books %}
    <div class="text-center">
      <!-- Read book buttons -->
      <button type="button" class="read-book bs-modal btn btn-sm btn-primary" data-form-url="{% url 'read_book' book.pk %}">
        <span class="fa fa-eye"></span>
      </button>
      <!-- Update book buttons -->
      <button type="button" class="update-book bs-modal btn btn-sm btn-primary" data-form-url="{% url 'update_book' book.pk %}">
        <span class="fa fa-pencil"></span>
      </button>
      <!-- Delete book buttons -->
      <button type="button" class="delete-book bs-modal btn btn-sm btn-danger" data-form-url="{% url 'delete_book' book.pk %}">
        <span class="fa fa-trash"></span>
      </button>
    </div>
{% endfor %}

<script type="text/javascript">
  $(function () {

    // Read book buttons
    $(".read-book").each(function () {
        $(this).modalForm({formURL: $(this).data("form-url")});
    });

    // Delete book buttons - formURL is retrieved from the data of the element
    $(".delete-book").each(function () {
        $(this).modalForm({formURL: $(this).data("form-url"), isDeleteForm: true});
    });

    // Create book button opens form in modal with id="create-modal"
    $("#create-book").modalForm({
        formURL: "{% url 'create_book' %}",
        modalID: "#create-modal"
    });

  });
</script>
  • See the difference between button triggering Create action and buttons triggering Read, Update and Delete actions.
  • Within the for loop in .html file the data-form-url attribute of each Update, Read and Delete button should be set to relevant URL with pk argument of the object to be updated, read or deleted.
  • These data-form-url URLs should than be set as formURLs for modalForms bound to the buttons.

Example 4: Django's forms.Form in Bootstrap modal

For explanation how all the parts of the code work together see paragraph Usage. To test the working solution presented here clone and run Examples.

forms.py

from bootstrap_modal_forms.forms import BSModalForm

class BookFilterForm(BSModalForm):
    type = forms.ChoiceField(choices=Book.BOOK_TYPES)

    class Meta:
        fields = ['type']
filter_book.html

{% load widget_tweaks %}

<form method="post" action="">
  {% csrf_token %}

  <div class="modal-header">
    <h3 class="modal-title">Filter Books</h3>
    <button type="button" class="close" data-dismiss="modal" aria-label="Close">
      <span aria-hidden="true">&times;</span>
    </button>
  </div>

  <div class="modal-body">
    <div class="{% if form.non_field_errors %}invalid{% endif %} mb-2">
      {% for error in form.non_field_errors %}
        {{ error }}
      {% endfor %}
    </div>

    {% for field in form %}
      <div class="form-group">
        <label for="{{ field.id_for_label }}">{{ field.label }}</label>
        {% render_field field class="form-control" placeholder=field.label %}
        <div class="{% if field.errors %} invalid{% endif %}">
          {% for error in field.errors %}
            <p class="help-block">{{ error }}</p>
          {% endfor %}
        </div>
      </div>
    {% endfor %}
  </div>

  <div class="modal-footer">
    <button type="submit" class="btn btn-primary">Filter</button>
  </div>

</form>
views.py

class BookFilterView(BSModalFormView):
    template_name = 'examples/filter_book.html'
    form_class = BookFilterForm

    def form_valid(self, form):
        self.filter = '?type=' + form.cleaned_data['type']
        response = super().form_valid(form)
        return response

    def get_success_url(self):
        return reverse_lazy('index') + self.filter
urls.py

from django.urls import path
from . import views

app_name = 'accounts'
urlpatterns = [
    path('filter/', views.BookFilterView.as_view(), name='filter_book'),
]
index.html

  ...
  <button id="filter-book" class="filter-book btn btn-primary" type="button" name="button" data-form-url="{% url 'filter_book' %}">
    <span class="fa fa-filter mr-2"></span>Filter books
  </button>
  ...

  <script type="text/javascript">
    $(function () {
      ...
      $("#filter-book").each(function () {
          $(this).modalForm({formURL: $(this).data('form-url')});
      });
      ...
    });
  </script>

Contribute

This is an Open Source project and any contribution is appreciated.

License

This project is licensed under the MIT License.