Django-Form 补充

一、Form的前端循环

           class LoginForm(Form):
                name = ...
                pwd = ...
                
            
            def func(request):
                form = LoginForm()
                
                return ren....
                
             //不循环
            <div>
                {{ form.name }} {{for.errors.name.0}}
                {{ form.pwd }} {{for.errors.pwd.0}}
            </div>
            //循环
            <div>
                {% for fd in form %}
                    {{fd.label}}  {{fd}}  {{fd.errors.0}}
                {% endfor %}
            </div>

二、自定义Form验证规则

from正则校验的方法有三种

from django.core.exceptions import ValidationError

from django.core.validators import RegexValidator

            def func(val):
                if len(val) < 15:
                    raise ValidationError('你太短了')#必须是ValidationError
                    
            
            class LoginForm(Form):
                name1 = fields.CharField(label='xxx', widget=widgets.Textarea, validators=[RegexValidator(regex=""),])#第一种 导入
                name2 = fields.RegexField(label='xxx', widget=widgets.Textarea, regex="xxx")#第二种
                
                name3 = fields.CharField(label=que.caption, widget=widgets.Textarea, validators=[func, "错误信息"])#第三种 func为上面的func函数
                #当然对于一些复杂的逻辑建议使用钩子函数
                def clean_name1(self,val):
                    return val 
                

三 定义类的两种方法

第一种

class User(object):
    countury='china'
    def __init__(self,args):
        self.args=args
        
    def get(self):
        return self.args

第二种

#类名=type('类名',(继承的类,),dict)
def ff():
    return 123
Foo = type('Foo',(object,),{'x1':8,'func':lambda self,arg:arg,"ff":ff})

应用

问卷调查学生填写问卷的时候动态生成form

def fun(value):
    if len(value)<15:
        raise ValidationError("必须超过15字")

 dic = {}
    questions=models.Question.objects.filter(questionSuv__id=questionSuv_id).all()

    for question in questions:

        if question.type==1:
            dic['option_id_%s'%question.id]=fields.ChoiceField(
               label=question.title,
               widget=widgets.RadioSelect,
               choices=models.Option.objects.filter(question=question).values_list("id","title"),
               error_messages={"required": "必选"},
             )
        elif question.type ==2:
            dic['value_%s'%question.id]=fields.ChoiceField(
               label=question.title,
               widget=widgets.RadioSelect,
               choices=[(i,i) for i in range(1,11)],
               error_messages={"required":'必选'},
            )

        else:
            dic["content_%s"%question.id]=fields.CharField(
               label=question.title,
               widget=widgets.Textarea,
               error_messages={"required":'必填'},
               validators=[fun,],
            )




    #创建对象的另一种方法 这是动态生成form
    JoinQuestionSuvForm = type('JoinQuestionSuvForm', (Form,), dic)