一尘不染

如何在Django表单声明中设置标签的CSS类?

django

我正在使用django-uniform并使用一些统一功能,我正在寻找一种直接从表单声明中添加css类的方法(对于独立窗口小部件)。

(作为奖励,这里是我可重复使用的只读家庭自制混合片段……)

from django import forms

def _get_cleaner(form, field):
    def clean_field():
        return getattr(form.instance, field, None)
    return clean_field

class UniformROMixin(forms.BaseForm):
    """
    UniformROMixin, inherits to turn some fields read only

      - read_only = list of field names.
    """

    def __init__(self, *args, **kwargs):
        super(UniformROMixin, self).__init__(*args, **kwargs)
        if hasattr(self, "read_only"):
            if self.instance and self.instance.pk:
                for field in self.read_only:
                    self.fields[field].widget.attrs['readonly'] = True
                    self.fields[field].widget.attrs['class'] += "readOnly"
                    # here I would like to set css class of the label
                    # created from the self.fields[field].label string
                    setattr(self, "clean_" + field, _get_cleaner(self, field))

目前,我唯一的方法是在通用表单模板上添加一些javascript并手动添加类。


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2020-04-02

共2个答案

一尘不染

我发现此片段可能是一个不错的答案:

如何将CSS类和“ *”添加到必填字段的标签

这是适应我需要的内容(未经测试,完成后我将对其进行编辑):

from django.utils.html import escape

def readonly_cssclass_adder(bound_field, label_content, label_attrs):
    if 'readonly' in bound_field.field.widget.attrs:
        if 'class' in attrs:
            label_attrs['class'] += " readOnly"
        else:
            label_attrs['class'] = "readOnly"
    return label_content, label_attrs


def add_required_label_tag(original_function, tweak_foos=None):
    if not tweak_foos:
        return original_function

    def required_label_tag(self, contents=None, attrs=None):
        contents = contents or escape(self.label)
        if attrs is None:
            attrs = {}
        for foo in tweak_foos:
            contents, attrs = foo(self, contents, attrs)
        return original_function(self, contents, attrs)
    return required_label_tag

def decorate_bound_field():
    from django.forms.forms import BoundField
    BoundField.label_tag = add_required_label_tag(BoundField.label_tag, 
                                           tweak_foos=[readonly_cssclass_adder])

如果您有一个更好的解决方案,而不需要调整所有的BoundField类,我仍在听。

编辑:可能链接到Django统一方式来处理必填字段,但似乎不调用readonly_cssclass_adder。但是我找到了另一个更简单的解决方案,我的readOnly小部件会自动变为readOnly ctrlHolder

此添加是我目前最喜欢的回复:

编辑2:最后我选择的另一种方法是“覆盖” uni_form/field.html不调用BoundField.label_tag 的模板。所以我在这里检查了字段状态。

<label for="{{ field.auto_id }}"{% if field.field.required %}
       class="requiredField{% if field.widget.attrs.readonly %} readOnlyLabel{% endif %}"
       {% else %}{% if field.widget.attrs.readonly %}class="readOnlyLabel"{% endif %}{% endif %}>
    {{ field.label|safe }}{% if field.field.required %}<span class="asteriskField">*</span>{% endif %}
</label>
2020-04-02
一尘不染

窗口小部件的attrs关键字参数带有dict,可以定义其呈现的输入元素的属性。表单还具有一些可以定义的属性,以更改Django显示表单的方式。请看以下示例:

class MyForm(forms.Form):
    error_css_class = 'error'
    required_css_class = 'required'
    my_field = forms.CharField(max_length=10,
                               widget=forms.TextInput(attrs={'id': 'my_field',
                                                             'class': 'my_class'}))

这适用于任何Widget课程。不幸的是,没有一种简单的方法可以改变Django渲染标签的方式{{ field }}。幸运的是,你在模板中使用了表单对象:

<form>
    {% for field in form %}
        <label class="my_class" for="{{ field.name }}">{{ field.label }}</label>
        {{ field }}
    {% endfor %}
    <button type="submit">Submit</button>
</form>

再说一遍,你始终可以向正在使用的对象添加任意属性:

# In a view...
form = MyForm()
form.label_classes = ('class_a', 'class_b', )
# Or by hijacking ```__init__```
class MyForm(forms.Form):
    def __init__(self, *args, **kwargs):
        self.my_field = forms.CharField(max_length=10,
                                        widget=forms.TextInput(attrs={'id': 'my_field',
                                                                      'class': 'my_class'}))
        self.my_field.label_classes = ('class_a', 'class_b', )
        super(MyForm, self).__init__(*args, **kwargs)

在上下文中使用表单呈现模板,你可以在模板中执行以下操作:

<form>
    {% for field in form %}
        <label class="{% for class in field.label_classes %}{{ class }} {% endfor %}"
               for="{{ field.name }}">{{ field.label }}</label>
        {{ field }}
    {% endfor %}
    <button type="submit">Submit</button>
</form>
2020-04-02