Form组件

1.1 初识Form组件

基于注册为例来进行测试。

详细见示例：1-form组件.zip

1.2 错误信息

1.3 展示所有的字段

对象和可迭代对象。

1.4 问题：关于样式

• 手动操作

  class RegisterForm(forms.Form):
      v1 = forms.CharField(
          label="手机号",
          required=True,
          # max_length=19,
          # min_length=6,
          initial="武沛齐",
          validators=[RegexValidator(r'^\d{11}$', "手机号格式错误"), ],
          widget=forms.TextInput(attrs={"class":"form-control"}) # <input type="text" class="form-control"/>
      )
      v2 = forms.CharField(
          label="备注",
          required=True,
          widget=forms.Textarea(attrs={"class":"form-control"}) # <textarea class="form-control"/></textarea>
      )
      ...
      ....
      .....
  

  {% for field in form %}
  	<p>{{ field.label }} {{ field }} {{ field.errors.0 }}  </p>
  {% endfor %}
  

• 自动操作（找到每个字段中的widget插件，再找到插件中的attrs属性，给他每个赋值{"class":"form-control"}

  class RegisterForm(forms.Form):
      v1 = forms.CharField(...,widget=forms.TextInput)
      v2 = forms.CharField(...,widget=forms.TextInput(attrs={"v1":"123"}))
      
      def __init__(self,*args,**kwargs):
          super().__init__(self,*args,**kwargs)
          for name,field in self.fields.items():
              if name == "v1":
                  continue 
              if field.widget.attrs:
                  field.widget.attrs.update({"class":"form-control"})
              else:
              	field.widget.attrs = {"class":"form-control"}
  

  form = RegisterForm()                   # __init__
  form = RegisterForm(data=request.POST)  # __init__
  

1.5 问题：通用父类

class BootStrapForm(object):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        for name, field in self.fields.items():
            field.widget.attrs = {"class": "form-control"}


class LoginForm(BootStrapForm, forms.Form):
    user = forms.CharField(label="用户名", widget=forms.TextInput)
    pwd = forms.CharField(label="密码", widget=forms.TextInput)


def login(request):
    form = LoginForm()
    return render(request, "login.html", {"form": form})

class BootStrapForm(forms.Form):
    def __init__(self, *args, **kwargs):
        # 不是找父类
        # 根据类的mro（继承关系），去找上个类
        # super().__init__(*args, **kwargs)
        for name, field in self.fields.items():
            field.widget.attrs = {"class": "form-control"}

class LoginForm(BootStrapForm):
    user = forms.CharField(label="用户名", widget=forms.TextInput)
    pwd = forms.CharField(label="密码", widget=forms.TextInput)

def login(request):
    form = LoginForm()
    return render(request, "login.html", {"form": form})