Django表单包含未知数量的复选框字段和多个操作

Question

我需要帮助表单看起来像Gmail收件箱并有多个操作.有一个项目列表,我想用表格包装它,在每个项目的前面有复选框的方式.因此,当用户选择几个项目时,他可以单击具有不同操作的两个按钮,例如删除和标记读取.

<form action="">
    {% for item in object_list %}
    <input type="checkbox" id="item.id">
    {{ item.name }}
    {% endfor %}
    <button type="submit" name="delete">Delete</button>
    <button type="submit" name="mark_read">Mark read</button>
</form>

我可以找到哪个提交按钮是用户点击如果使用if 'delete' in request.POST但我不能参考任何形式,因为我认为Django形式不能被定义为未知数量的字段.那么如何在视图中处理所选项目？

if request.method == 'POST':
    form = UnknownForm(request.POST):
    if 'delete' in request.POST:
        'delete selected items'
    if 'mark_read' in erquest.POST:
        'mark selected items as read'
    return HttpResponseRedirect('')

Answer 1

具有相同名称的多个复选框都是相同的字段.

<input type="checkbox" value="{{item.id}}" name="choices">
<input type="checkbox" value="{{item.id}}" name="choices">
<input type="checkbox" value="{{item.id}}" name="choices">

您可以使用单个django表单字段收集和聚合它们.

class UnknownForm(forms.Form):
    choices = forms.MultipleChoiceField(
        choices = LIST_OF_VALID_CHOICES, # this is optional
        widget  = forms.CheckboxSelectMultiple,
    )

具体来说,您可以使用ModelMultipleChoiceField.

class UnknownForm(forms.Form):
    choices = forms.ModelMultipleChoiceField(
        queryset = queryset_of_valid_choices, # not optional, use .all() if unsure
        widget  = forms.CheckboxSelectMultiple,
    )

if request.method == 'POST':
    form = UnknownForm(request.POST):
    if 'delete' in request.POST:
        for item in form.cleaned_data['choices']:
            item.delete()
    if 'mark_read' in request.POST:
        for item in form.cleaned_data['choices']:
            item.read = True; item.save()

Answer 2

我无法评论Thomas解决方案,所以我在这里做.

对于ModelMultipleChoiceField,参数名称不是选项而是queryset.

所以采取最后一个例子:

class UnknownForm(forms.Form):
choices = forms.ModelMultipleChoiceField(
    choices = queryset_of_valid_choices, # not optional, use .all() if unsure
    widget  = forms.CheckboxSelectMultiple,
)

Answer 3

我在使用类基本视图并遍历Django HTML模板中的未知大小列表时遇到了相同的问题。

该解决方案使用“ post”并为我工作。我将其放在此处是因为上述解决方案很有用，但并没有为我解决循环问题。

HTML模板：

<form action="" method="post">
    {% for item in object_list %}
        <input type="checkbox" value="{{item.id}}" name="my_object">
        {{ item.name }}
    {% endfor %}
    <button type="submit" name="delete">Delete</button>
    <button type="submit" name="mark_read">Mark read</button>
</form>

形成：

class MyForm(forms.Form):
    my_object = forms.MultipleChoiceField(
        widget=forms.CheckboxSelectMultiple,
    )

在基于类的视图中，使用post函数访问POST数据。这将允许您访问已选中项目，上下文和其他表单数据的列表。

视图：

Class MyView(FormView):
    template_name = "myawesometemplate.html"
    form_class = MyForm
...
# add your code here 

    def post(self, request, *args, **kwargs):
        ...
        context = self.get_context_data()
        ...
        if 'delete' in request.POST:
            for item in form.POST.getlist('my_object'):
                # Delete
        if 'mark_read' in request.POST:
            for item in form.POST.getlist('my_object'):
                # Mark as read