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Extend Django formsets with JavaScript

Project description

A wrapper for a JavaScript formset helper.


Install via pip:

pip install django-formset-js

Then add it and its dependancy django-jquery-js to your INSTALLED_APPS:



Include the JavaScript library

Both jQuery and this library must be included in your page. The simplest way to do this is to add the scripts as media dependencies on your form:

from djangoformsetjs.utils import formset_media_js

class MyForm(forms.Form):
    class Media(object):
        js = formset_media_js + (
            # Other form media here

MyFormSet = formset_factory(MyForm)

And then include the Media of the form in your template:

{{ }}

Alternatively, simply add the script tags:

<script src="{{ STATIC_URL }}js/jquery.js"></script>
<script src="{{ STATIC_URL }}js/jquery.formset.js"></script>

Render the formset

So that the library can work with your formset, certain blocks of your formset need to be marked up with data-formset-... attributes:

{% load formset_tags %}

<div id="formset" data-formset-prefix="{{ formset.prefix }}">
    {{ formset.management_form }}

    <div data-formset-body>
        <!-- New forms will be inserted in here -->
        {% for form in formset %}
            <div data-formset-form>
                {{ form }}
                <button type="button" data-formset-delete-button>Delete form</button>
        {% endfor %}

    <!-- The empty form template. By wrapping this in a <script> tag, the
    __prefix__ placeholder can easily be replaced in both attributes and
    any scripts -->
    <script type="form-template" data-formset-empty-form>
        {% escapescript %}
            <div data-formset-form>
                {{ formset.empty_form }}
                <button type="button" data-formset-delete-button>Delete form</button>
        {% endescapescript %}

    <!-- This button will add a new form when clicked -->
    <input type="button" value="Add another" data-formset-add>

    <script>jQuery(function($) {
            animateForms: true


The data-formset- data attributes are:


The value of {{ formset.prefix }}. This is used to find the management form.


This indicates where all the child forms are. New forms are inserted in here.


Every form (including the empty form) should have this attribute.


The element that contains the empty form template. For best results, use a <script> tag.


A button that adds a new form.


A button that deletes that form.

The empty form template is wrapped in a <script> as plain text. This stops any JavaScript attached to widgets from running upon page load, and makes finding and replacing the __prefix__ placeholder easier. The contents of the <script> should be wrapped in a {% escapescript %} block to prevent any script tags inside from closing the wrapping script tag prematurely.

When the data-formset-add button is clicked, the formAdded event is fired on the form which was added. This event propagates upwards, and as such can be handled from the form container. For example, to select the new form added for form additions from the above example, bind as such:

$('#formset').on('formAdded', function(event) {
    newForm =;
    //Do Stuff

If the forms can be deleted, and contain a delete checkbox, the following actions occur:

  • When the checkbox is checked, marking the form for deletion, the formDeleted event is fired on the data-formset-form container, and the data-formset-form-deleted attribute is added.

  • When the checkbox is unchecked, marking the form as active again, the formAdded event is fired on the data-formset-form container, and the data-formset-form-deleted attribute is removed.

If the forms can be deleted, and contain a delete button, pressing the delete button will toggle the delete checkbox for that form. The DELETE field should be hidden if the delete button is used. The delete button is identified by the data-formset-delete-button attribute:

{% for form in formset %}
    <div data-formset-form>
        {{ }}
        {{ form.age }}

        <div class="hidden">{{ form.DELETE }}</div>
        <button type="button" data-formset-delete-button>Delete form</button>
{% endfor %}

If the animateForms option is set when the formset is created, adding and deleting forms will be animated by sliding the forms in and out.


The jQuery plugin takes the following options:


The selector to find forms. Defaults to [data-formset-form].


The selector to find the empty form template. Defaults to script[type=form-template][data-formset-empty-form].


The selector to find the formset body. New forms will be inserted at the bottom of this element. Defaults to [data-formset-body].


The selector to find the add button. Defaults to [data-formset-add].


The selector to find the delete button within a form. Defaults to [data-formset-delete-button].


The class added to the formset when the maximum number of forms is reached. The maximum number of forms is pulled from the management form. Defaults to has-max-forms.


Whether to animate form addition/deletion. Defaults to false.


A minimal example project is provided in the example/ directory. Read example/README for more information


When running ./ sdist, the JavaScript asset is minified using UglifyJS if it is installed. To install UglifyJS, install node.js and npm, and run:

npm install uglifyjs

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