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django-bootstrap-modal-forms

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django-bootstrap-modal-forms

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

3.0.5
PyPI

Maintainers: 1

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

.. contents:: Table of Contents :depth: 2 :local: :backlinks: none

Test and experiment on your machine

This repository includes Dockerfile and docker-compose.yml files so you can easily setup and start to experiment with django-bootstrap-modal-forms running inside of a container on your local machine. Any changes you make in bootstrap_modal_forms, examples and test folders are reflected in the container (see docker-compose.yml) and the data stored in sqlite3 database are persistent even if you remove stopped container.

Note that master branch contains Bootstrap 4 examples, while bootstrap5-examples branch contains Bootstrap 5 examples. To experiment with Bootstrap 5 examples simply switch the branch.

Follow the steps below to run the app::

$ clone repository
$ cd django-bootstrap-modal-forms
$ docker compose up (use -d flag to run app in detached mode in the background)
$ visit 0.0.0.0:8000

General information

Opening an issue

When reporting an issue for django-bootstrap-modal-forms package, please prepare a publicly available repository having the issue you are reporting. The clear reproduce is the optimal way towards resolution.

Contribute

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

Tests

Run unit and functional tests inside of project folder::

$ python manage.py test

Installation

Install django-bootstrap-modal-forms::

$ pip install django-bootstrap-modal-forms
Add bootstrap_modal_forms to your INSTALLED_APPS in settings.py::

INSTALLED_APPS = [ ... 'bootstrap_modal_forms', ... ]
Include Bootstrap, jQuery and jquery.bootstrap(5).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.

.. code-block:: html+django

<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-3.2.1.min.js' %}"></script>
    <script src="{% static 'assets/js/popper.min.js' %}"></script>
    <script src="{% static 'assets/js/bootstrap.min.js' %}"></script>
    <!-- You can alternatively load the minified version -->
    <script src="{% static 'js/jquery.bootstrap.modal.forms.js' %}"></script>

    <!-- Bootstrap 5 -->
    <script src="{% static 'assets/js/bootstrap.bundle.min.js' %}"></script>
    <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?

.. code-block:: html

index.html

<script type="text/javascript">

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

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

// BS5
// instantiate multiple modal forms with unique formUrls
document.addEventListener('DOMContentLoaded', (e) => {
  var deleteButtons = document.getElementsByClassName("delete-book");
  for (var index=0; index < deleteButtons.length; index++) {
    modalForm(deleteButtons[index], {
      formURL: deleteButtons[index]["dataset"]["formUrl"],
      isDeleteForm: true
    });
  }
});

</script>

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

Usage

Form

Define BookModelForm and inherit built-in form BSModalModelForm.

.. code-block:: python

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.

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.
IMPORTANT NOTE: Bootstrap 4 modal elements are used in this example. class="invalid" is the default for Bootstrap 4. class="is-invalid" is the default for Bootstrap 5.

.. code-block:: html

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. Function-based view

Whilst django-boostrap-modal-forms is primarily designed for class based usage (see below), there may be reasons you want to use its capabilities in classic function based views. To use them properly, you need to understand what exactly is going on and how you can adapt this mechanic into your own view.

Your regular function based view might look like this

.. code-block:: python

...
if request.method == 'POST':
    # do stuff
elif request.method == 'GET':
    # do other stuff
else:
    raise NotImplementedError('No stuff')
...

As you continue to develop your logic, you may see, that two POST requests are being send on your forms, even tho, the user only submitted it once:

The first request can be used to verify your form's validity, let's call it the ajax request (you will see why).
The second request can be used to save your form's data (depending on whether the validation was successful or not)

But how do you differentiate between these two requests? Using this handy method: is_ajax (https://github.com/trco/django-bootstrap-modal-forms/blob/dddf22e78aead693fedcabe94961fb1ddebc6db7/bootstrap_modal_forms/utils.py#L1)

So, your code may now look like this and is capable of handling both POST requests:

.. code-block:: python

...
if request.method == "POST":
    if form.is_valid():
        if not is_ajax(request.META):
            form.save()
            messages.success(
                request,
                msg_success
            )
        return HttpResponseRedirect(redirect_url)
...

4. 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.

.. code-block:: python

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')

5. URL for the view

Define URL for the view in #3.

.. code-block:: python

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'),
]

6. 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.

.. code-block:: html+django

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>

7. 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.

.. code-block:: html

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>

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.

.. code-block:: html

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>

.. code-block:: python

urls.py

from django.urls import path
from . import views

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

.. code-block:: python

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" for Boostrap 4 and ".is-invalid" for Bootstrap 5.

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

.. code-block:: html

triggerElement.modalForm({
    modalID: "#modal",
    modalContent: ".modal-content",
    modalForm: ".modal-content form",
    formURL: null,
    isDeleteForm: false,
    // ".invalid" is the default for Bootstrap 4. ".is-invalid" is the default for Bootstrap 5.
    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 Form Mixin which puts the request into the form's kwargs. Note: Using this mixin requires you to pop the request kwarg out of the dict in the super of your form's __init__. See PopRequestMixin.

PopRequestMixin Form Mixin which pops request out of the kwargs and attaches it to the form's instance. Note: This mixin must precede forms.ModelForm/forms.Form. The form is not expecting these kwargs to be passed in, so they must be popped off before anything else is done.

CreateUpdateAjaxMixin ModelForm Mixin which passes or saves object based on request type.

DeleteMessageMixin Generic View Mixin which adds message to BSModalDeleteView and only calls the post method if request is not ajax request. In case request is ajax post method calls delete method, which redirects to success url.

FormValidationMixin Generic View Mixin which saves object and redirects to success_url if request is not ajax request. Otherwise response 204 No content is returned.

LoginAjaxMixin Generic View Mixin which authenticates user if request is not ajax request.

Generic views

Import generic views with from bootstrap_modal_forms.generic import BSModalFormView.

BSModalLoginView Inhertis LoginAjaxMixin and Django's LoginView.

BSModalFormView Inherits PassRequestMixin and Django's generic.FormView.

BSModalCreateView Inherits PassRequestMixin, FormValidationMixin and generic.CreateView.

BSModalUpdateView Inherits PassRequestMixin, FormValidationMixin 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

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.

.. code-block:: python

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']

.. code-block:: html

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>

.. code-block:: python

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')

.. code-block:: python

urls.py

from django.urls import path
from . import views

app_name = 'accounts'
urlpatterns = [
    path('signup/', views.SignUpView.as_view(), name='signup')
]

.. code-block:: html

.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:

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

.. code-block:: python

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']

.. code-block:: html

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>

.. code-block:: python

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'))

.. code-block:: python

urls.py

from django.urls import path
from . import views

app_name = 'accounts'
urlpatterns = [
    path('login/', views.CustomLoginView.as_view(), name='login')
]

.. code-block:: html

.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.

.. code-block:: python

forms.py

from .models import Book
from bootstrap_modal_forms.forms import BSModalModelForm


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

.. code-block:: html

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>

.. code-block:: html

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>

.. code-block:: html

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>

.. code-block:: html

{% 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>

.. code-block:: python

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')

.. code-block:: python

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')
]

.. code-block:: html

.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.

.. code-block:: python

forms.py

from bootstrap_modal_forms.forms import BSModalForm

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

    class Meta:
        fields = ['type']

.. code-block:: html

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>

.. code-block:: python

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

.. code-block:: python

urls.py

from django.urls import path
from . import views

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

.. code-block:: html

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>

License

This project is licensed under the MIT License.

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