Django datetimefield 未显示新内联表单行的 datetimepicker 小部件

Question

关于下图，当我点击“添加条目”时，新条目行不再有 datetimepicker 小部件。这很奇怪，因为它有正确的类。 +1 字段代表 django 表单自动添加的附加字段。这似乎工作正常。只有在页面呈现后添加的字段可能是解决方案的关键。

我使用 flatpickr 包作为我的 datetimepicker 小部件。

trade_form.html

{% extends 'dashboard/base.html' %}
{% load static %}

{% block content %}

<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script src="{% static 'js/formset/jquery.formset.js' %}"></script>

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/flatpickr/dist/flatpickr.min.css">
<script src="https://cdn.jsdelivr.net/npm/flatpickr"></script>


<!-- Page Heading -->
<div class="d-sm-flex align-items-center justify-content-between mb-3">
    <h2>New Trade</h2>
</div>

<div class="row">
    <div class="col">
        <form action="" method="post">{% csrf_token %}
            {{ form.media }}
            {{ form.as_p }}

            <table class="table">
                {{ entries.management_form }}

                {% for form in entries.forms %}
                {% if forloop.first %}
                <thead>
                <tr>
                    {% for field in form.visible_fields %}
                    <th>{{ field.label|capfirst }}</th>
                    {% endfor %}
                </tr>
                </thead>
                {% endif %}
                <tr class="{% cycle row1 row2 %} formset_row">
                    {% for field in form.visible_fields %}
                    <td>
                        {# Include the hidden fields in the form #}
                        {% if forloop.first %}
                        {% for hidden in form.hidden_fields %}
                        {{ hidden }}
                        {% endfor %}
                        {% endif %}
                        {{ field.errors.as_ul }}
                        {{ field }}
                    </td>
                    {% endfor %}
                </tr>
                {% endfor %}
            </table>
            <input type="submit" value="Save"/> <a href="{% url 'trade-list' %}">back to the list</a>
        </form>
    </div>


</div>

<script type="text/javascript">
    $('.formset_row').formset({
        addText: 'add entry',
        deleteText: 'remove',
        prefix: 'entry_set'
    });

</script>

<!-- Makes DateTimeFields Show Picker-->
<script>
    // This code activates flatpickr on fields with the 'datetimefield' class when the document has loaded
    window.addEventListener("DOMContentLoaded", function () {
        flatpickr(".datetimefield", {
            enableTime: true,
            enableSeconds: true,
            dateFormat: "Y-m-d H:i:S",
        });
    });
</script>

{% endblock content %}

forms.py

class EntriesForm(ModelForm):
    class Meta:
        model = Entry
        exclude = ()
        widgets = {
            'date': forms.DateTimeInput(format='%Y-%m-%d %H:%M:%S', attrs={'class': 'datetimefield'}),
        }

    # Adding default class to every visible field 

    def __init__(self, *args, **kwargs):
        super(EntriesForm, self).__init__(*args, **kwargs)
        for field_name, field in self.fields.items():
            if field.widget.attrs.get('class'):
                field.widget.attrs['class'] += ' form-control'
            else:
                field.widget.attrs['class'] = 'form-control'

EntriesFormSet = inlineformset_factory(Trade, Entry, form=EntriesForm, extra=1)

---

更新了 trade_form.html 脚本，但仍然没有成功。 到目前为止，这段代码只是删除了已经工作的字段上的 datetimepicker 小部件。所以可能只是格式问题。

<!-- Makes DateTimeFields Show Picker-->
<script>
    // This code activates flatpickr on fields with the 'datetimefield' class when the document has loaded
    window.addEventListener(

        "DOMContentLoaded", function () {
            flatpickr(".datetimefield", {
                enableTime: true,
                enableSeconds: true,
                dateFormat: "Y-m-d H:i:S",
            });
        }

        "added", function() {
            flatpickr(".datetimefield", {
                enableTime: true,
                enableSeconds: true,
                dateFormat: "Y-m-d H:i:S",
            });

        }

    );
</script>

Answer 1

added 需要放在的地方是在django-dynamic-formset 调用中，而不是在addEventListener 代码中，因为调用是由django-dynamic-formset 自己完成的。

那是：（注意：我自己没有测试过，因为我现在正在打电话）

<script type="text/javascript">

    function applyFlatpickr(parent) {
     flatpickr(parent.find(".datetimefield"), {
                enableTime: true,
                enableSeconds: true,
                dateFormat: "Y-m-d H:i:S",
            });
    }
    <!-- Makes DateTimeFields Show Picker-->
        // This code activates flatpickr on fields with the 'datetimefield' class when the document has loaded
        window.addEventListener("DOMContentLoaded", function(){applyFlatpickr($(document))});

        $('.formset_row').formset({
            addText: 'add entry',
            deleteText: 'remove',
            prefix: 'entry_set',
            added: applyFlatpickr
        });
    </script>
</script>

django-dynamic-formset 将新创建的行作为 jQuery 对象传递给 added 函数，因此通过在参数上使用.find，我们可以仅匹配新添加的行并将 flatpickr 仅应用于该新行。

来自django-dynamic-formset 文档：

added 如果将此设置为一个函数，则该函数将在每个函数中调用 添加新表单的时间。该函数应采用单个参数， row;它将被传递一个 jQuery 对象，包装表单 刚刚添加。）