django之Form组件补充

自定义验证规则

方法一：

from django.forms import Form

from django.forms import widgets
from django.forms import fields
from django.core.validators import RegexValidator
  
class MyForm(Form):
    user = fields.CharField(
        validators=[RegexValidator(r'^[0-9]+$', '请输入数字'), RegexValidator(r'^159[0-9]+$', '数字必须以159开头')],
    )

方法二

import re
from django.forms import Form
from django.forms import widgets
from django.forms import fields
from django.core.exceptions import ValidationError
  
  
# 自定义验证规则
def mobile_validate(value):
    mobile_re = re.compile(r'^(13[0-9]|15[012356789]|17[678]|18[0-9]|14[57])[0-9]{8}$')
    if not mobile_re.match(value):
        raise ValidationError('手机号码格式错误')
  
  
class PublishForm(Form):
  
  
    title = fields.CharField(max_length=20,
                            min_length=5,
                            error_messages={'required': '标题不能为空',
                                            'min_length': '标题最少为5个字符',
                                            'max_length': '标题最多为20个字符'},
                            widget=widgets.TextInput(attrs={'class': "form-control",
                                                          'placeholder': '标题5-20个字符'}))
  
  
    # 使用自定义验证规则
    phone = fields.CharField(validators=[mobile_validate, ],
                            error_messages={'required': '手机不能为空'},
                            widget=widgets.TextInput(attrs={'class': "form-control",
                                                          'placeholder': u'手机号码'}))
  
    email = fields.EmailField(required=False,
                            error_messages={'required': u'邮箱不能为空','invalid': u'邮箱格式错误'},
                            widget=widgets.TextInput(attrs={'class': "form-control", 'placeholder': u'邮箱'}))

方法三：

from django.forms import Form
from django.forms import fields
from django.forms import widgets
from app01 import models
from django.core.validators import RegexValidator

class UserInfoForm(Form):
    name=fields.CharField(
        required=True,
        min_length=6,
        max_length=12,
    )#用户提交是字符串
    email=fields.EmailField()#用户提交是字符串 正则
    phone=fields.CharField(
        #1.通过对象（支持正则表达式）
        # validators=[RegexValidator(r'^[0-9]+$', '请输入数字'), RegexValidator(r'^159[0-9]+$', '数字必须以159开头')]
        #2.通过函数
        # validators=([mobile_validate,])
        #在当前类中 方法名称有要求
        # validators=([clean_phone])
    )#自定义验证规则 正则

def clean_phone(self):
    # 去取用户提交的值：可能是错误的，可能是正确
    value = self.cleaned_data['phone']
    mobile_re = re.compile(r'^(13[0-9]|15[012356789]|17[678]|18[0-9]|14[57])[0-9]{8}$')
    if not mobile_re.match(value):
        raise ValidationError('手机号码格式错误')

    if models.UserInfo.objects.filter(phone=value).count():
        raise ValidationError('手机号码已经存在')