在 Django 表单中，自定义 SelectField 和 SelectMultipleField [英] In Django form, custom SelectField and SelectMultipleField

问题描述

我现在每天都在使用 Django 三个月，它真的很棒.快速的网络应用开发.

I am using Django everyday now for three month and it is really great. Fast web application development.

我还有一件事不能完全按照我的意愿去做.它是 SelectField 和 SelectMultiple 字段.

I have still one thing that I cannot do exactly how I want to. It is the SelectField and SelectMultiple Field.

我希望能够将一些参数添加到 Select 选项中.

I want to be able to put some args to an option of a Select.

我终于在 optgroup 上取得了成功:

I finally success with the optgroup :

class EquipmentField(forms.ModelChoiceField):
    def __init__(self, queryset, **kwargs):
        super(forms.ModelChoiceField, self).__init__(**kwargs)
        self.queryset = queryset
        self.to_field_name=None

        group = None
        list = []
        self.choices = []

        for equipment in queryset:
            if not group:
                group = equipment.type

            if group != equipment.type:
                self.choices.append((group.name, list))
                group = equipment.type
                list = []
            else:
                list.append((equipment.id, equipment.name))

但是对于另一个 ModelForm，我必须使用模型的 color 属性更改每个选项的背景颜色.

But for another ModelForm, I have to change the background color of every option, using the color property of the model.

你知道我该怎么做吗?

谢谢.

推荐答案

render_option 已从 Django 1.11 中删除.这就是我为实现这一目标所做的.一点点挖掘，这看起来简单明了.适用于 Django 2.0+

render_option has been removed from Django 1.11 onwards. This is what I did to achieve this. A little bit of digging and this seems straightforward and neat. Works with Django 2.0+

class CustomSelect(forms.Select):
    def __init__(self, attrs=None, choices=()):
        self.custom_attrs = {}
        super().__init__(attrs, choices)

    def create_option(self, name, value, label, selected, index, subindex=None, attrs=None):
        index = str(index) if subindex is None else "%s_%s" % (index, subindex)
        if attrs is None:
            attrs = {}
        option_attrs = self.build_attrs(self.attrs, attrs) if self.option_inherits_attrs else {}
        if selected:
            option_attrs.update(self.checked_attribute)
        if 'id' in option_attrs:
            option_attrs['id'] = self.id_for_label(option_attrs['id'], index)

        # setting the attributes here for the option
        if len(self.custom_attrs) > 0:
            if value in self.custom_attrs:
                custom_attr = self.custom_attrs[value]
                for k, v in custom_attr.items():
                    option_attrs.update({k: v})

        return {
            'name': name,
            'value': value,
            'label': label,
            'selected': selected,
            'index': index,
            'attrs': option_attrs,
            'type': self.input_type,
            'template_name': self.option_template_name,
        }


class MyModelChoiceField(ModelChoiceField):

    # custom method to label the option field
    def label_from_instance(self, obj):
        # since the object is accessible here you can set the extra attributes
        if hasattr(obj, 'type'):
            self.widget.custom_attrs.update({obj.pk: {'type': obj.type}})
        return obj.get_display_name()

形式:

class BookingForm(forms.ModelForm):

    customer = MyModelChoiceField(required=True,
                                  queryset=Customer.objects.filter(is_active=True).order_by('name'),
                                  widget=CustomSelect(attrs={'class': 'chosen-select'}))

我需要的输出是:

  <select name="customer" class="chosen-select" required="" id="id_customer">
      <option value="" selected="">---------</option>
      <option value="242" type="CNT">AEC Transcolutions Private Limited</option>
      <option value="243" type="CNT">BBC FREIGHT CARRIER</option>
      <option value="244" type="CNT">Blue Dart Express Limited</option>

这篇关于在 Django 表单中，自定义 SelectField 和 SelectMultipleField的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！