nk20/templates/treasury/invoice_form.html

{% extends "base.html" %}
{% load static %}
{% load i18n %}
{% load crispy_forms_tags %}
{% block content %}
    <p><a class="btn btn-default" href="{% url 'treasury:invoice_list' %}">{% trans "Invoices list" %}</a></p>
    <form method="post" action="">
        {% csrf_token %}
        {# Render the invoice form #}
        {% crispy form %}
        {# The next part concerns the product formset #}
        {# Generate some hidden fields that manage the number of products, and make easier the parsing #}
        {{ formset.management_form }}
        <table class="table table-condensed table-striped">
            {# Fill initial data #}
            {% for form in formset %}
                {% if forloop.first %}
                    <thead>
                    <tr>
                        <th>{{ form.designation.label }}<span class="asteriskField">*</span></th>
                        <th>{{ form.quantity.label }}<span class="asteriskField">*</span></th>
                        <th>{{ form.amount.label }}<span class="asteriskField">*</span></th>
                    </tr>
                    </thead>
                    <tbody id="form_body">
                {% endif %}
                <tr class="row-formset">
                    <td>{{ form.designation }}</td>
                    <td>{{ form.quantity }}</td>
                    <td>{{ form.amount }}</td>
                    {# These fields are hidden but handled by the formset to link the id and the invoice id #}
                    {{ form.invoice }}
                    {{ form.id }}
                </tr>
            {% endfor %}
            </tbody>
        </table>

        {# Display buttons to add and remove products #}
        <div class="btn-group btn-block" role="group">
            <button type="button" id="add_more" class="btn btn-primary">{% trans "Add product" %}</button>
            <button type="button" id="remove_one" class="btn btn-danger">{% trans "Remove product" %}</button>
        </div>

        <div class="btn-block">
            <button type="submit" class="btn btn-block btn-primary">{% trans "Submit" %}</button>
        </div>
    </form>

    <div id="empty_form" style="display: none;">
        {# Hidden div that store an empty product form, to be copied into new forms #}
        <table class='no_error'>
            <tbody id="for_real">
            <tr class="row-formset">
                <td>{{ formset.empty_form.designation }}</td>
                <td>{{ formset.empty_form.quantity }} </td>
                <td>{{ formset.empty_form.amount }}</td>
                {{ formset.empty_form.invoice }}
                {{ formset.empty_form.id }}
            </tr>
            </tbody>
        </table>
    </div>
{% endblock %}

{% block extrajavascript %}
    <script>
        {# Script that handles add and remove lines #}
        IDS = {};

        $("#id_product_set-TOTAL_FORMS").val($(".row-formset").length - 1);

        $('#add_more').click(function () {
            var form_idx = $('#id_product_set-TOTAL_FORMS').val();
            $('#form_body').append($('#for_real').html().replace(/__prefix__/g, form_idx));
            $('#id_product_set-TOTAL_FORMS').val(parseInt(form_idx) + 1);
            $('#id_product_set-' + parseInt(form_idx) + '-id').val(IDS[parseInt(form_idx)]);
        });

        $('#remove_one').click(function () {
            let form_idx = $('#id_product_set-TOTAL_FORMS').val();
            if (form_idx > 0) {
                IDS[parseInt(form_idx) - 1] = $('#id_product_set-' + (parseInt(form_idx) - 1) + '-id').val();
                $('#form_body tr:last-child').remove();
                $('#id_product_set-TOTAL_FORMS').val(parseInt(form_idx) - 1);
            }
        });
    </script>
{% endblock %}