2019-01-03

Form表单验证(用户请求验证+生成HTML标签)

  • 需求:添加用户界面
    • 显示HTML标签
    • 提交:数据验证
    • 成功之后保存
    • 错误显示错误信息

1. 创建Form类

创建自定义类,继承Form , 类属性 最好与数据库 列名相同:
    error_messages:错误信息
    widget:渲染方式
    required:不为空

        def __init__(self,*args,**kwargs):
            super(UserForm,self).__init__(*args,**kwargs)
            # self.fields已经有所有拷贝的字段
            self.fields['ut_id'].choices = models.UserType.objects.values_list('id','title')
            self.fields['role_id'].choices = models.Role.objects.values_list('id','caption')

如果需要读库的内容,则应该放入 类初始化方法中,不然数据库有更新,却更新不到页面,
因为类属性 只有在第一次生成的时候执行,而 初始化方法 在每次类被调用的时候都执行,能拿到第一手资料

from django.forms import Form
      from django.forms import fields
      from django.forms import widgets

      class MyForm (Form):
         username = fields.CharField(
            required=True,
            error_messages={'required':'用户名不能为空'},
            widget=widgets.TextInput(attrs={'class':'form-control'})
         )
         password = fields.CharField(
            required=True,
            error_messages={'required': '邮箱不能为空','invalid':'邮箱格式错误'},
            widget = widgets.TextInput(attrs={'class': 'form-control'})
         )
         # fields.EmailField()
         # fields.GenericIPAddressField(protocol='ipv4')

         ut_id = fields.ChoiceField(
            choices=[],
            widget=widgets.Select(attrs={'class':'form-control'})
         )

         role_id = fields.MultipleChoiceField(
            choices=[],
            widget=widgets.SelectMultiple(attrs={'class':'form-control'})
         )

第一步:创建form类

2. 生成HTML标签:添加页面

form = MyForm()
{{form.xx}}

{{ form.user }} {{ form.user.errors }}

{{ form.gender }} {{ form.gender.errors }}

{{ form.city }} {{ form.city.errors }}

{{ form.pwd }} {{ form.pwd.errors }}

生成html

3. 带默认值的HTML标签:编辑页面

form = MyForm(initial={'xx': xxx})
{{form.xx}}

from django.shortcuts import render, redirect
from .forms import MyForm
 
 
def index(request):
    if request.method == "GET":
        obj = MyForm()
        return render(request, 'index.html', {'form': obj})
    elif request.method == "POST":
        obj = MyForm(request.POST, request.FILES)
        if obj.is_valid():
            values = obj.clean()
            print(values)
        else:
            errors = obj.errors
            print(errors)
        return render(request, 'index.html', {'form': obj})
    else:
        return redirect('http://www.google.com')

View 处理

4. 提交数据

      form = MyForm(data=request.POST)
      
      if form.is_valid():
         print(form.cleaned_data)
      else:
         print(form.errors)
  • 问题:下拉框数据无法实时更新
      class UserForm(Form):
         username = fields.CharField(
            required=True,
            error_messages={'required':'用户名不能为空'}
         )
         password = fields.CharField(
            required=True,
            error_messages={'required': '邮箱不能为空','invalid':'邮箱格式错误'}
         )

         ut_id = fields.ChoiceField(choices=[])

         def __init__(self,*args,**kwargs):
            super(UserForm,self).__init__(*args,**kwargs)

            self.fields['ut_id'].choices = models.UserType.objects.values_list('id','title')

Form类

  • 创建Form类时,主要涉及 字段插件
    • 字段:用于对用户请求数据的验证
    • 插件:用于自动生成HTML

1. Django内置字段

Field
    required=True,               是否允许为空
    widget=None,                 HTML插件
    label=None,                  用于生成Label标签或显示内容
    initial=None,                初始值
    help_text='',                帮助信息(在标签旁边显示)
    error_messages=None,         错误信息 {'required': '不能为空', 'invalid': '格式错误'}
    show_hidden_initial=False,   是否在当前插件后面再加一个隐藏的且具有默认值的插件(可用于检验两次输入是否一直)
    validators=[],               自定义验证规则
    localize=False,              是否支持本地化
    disabled=False,              是否可以编辑
    label_suffix=None            Label内容后缀
 
 
CharField(Field)
    max_length=None,             最大长度
    min_length=None,             最小长度
    strip=True                   是否移除用户输入空白
 
IntegerField(Field)
    max_value=None,              最大值
    min_value=None,              最小值
 
FloatField(IntegerField)
    ...
 
DecimalField(IntegerField)
    max_value=None,              最大值
    min_value=None,              最小值
    max_digits=None,             总长度
    decimal_places=None,         小数位长度
 
BaseTemporalField(Field)
    input_formats=None          时间格式化   
 
DateField(BaseTemporalField)    格式:2015-09-01
TimeField(BaseTemporalField)    格式:11:12
DateTimeField(BaseTemporalField)格式:2015-09-01 11:12
 
DurationField(Field)            时间间隔:%d %H:%M:%S.%f
    ...
 
RegexField(CharField)
    regex,                      自定制正则表达式
    max_length=None,            最大长度
    min_length=None,            最小长度
    error_message=None,         忽略,错误信息使用 error_messages={'invalid': '...'}
 
EmailField(CharField)      
    ...
 
FileField(Field)
    allow_empty_file=False     是否允许空文件
 
ImageField(FileField)      
    ...
    注:需要PIL模块,pip3 install Pillow
    以上两个字典使用时,需要注意两点:
        - form表单中 enctype="multipart/form-data"
        - view函数中 obj = MyForm(request.POST, request.FILES)
 
URLField(Field)
    ...
 
 
BooleanField(Field)  
    ...
 
NullBooleanField(BooleanField)
    ...
 
ChoiceField(Field)
    ...
    choices=(),                选项,如:choices = ((0,'上海'),(1,'北京'),)
    required=True,             是否必填
    widget=None,               插件,默认select插件
    label=None,                Label内容
    initial=None,              初始值
    help_text='',              帮助提示
 
 
ModelChoiceField(ChoiceField)
    ...                        django.forms.models.ModelChoiceField
    queryset,                  # 查询数据库中的数据
    empty_label="---------",   # 默认空显示内容
    to_field_name=None,        # HTML中value的值对应的字段
    limit_choices_to=None      # ModelForm中对queryset二次筛选
     
ModelMultipleChoiceField(ModelChoiceField)
    ...                        django.forms.models.ModelMultipleChoiceField
 
 
     
TypedChoiceField(ChoiceField)
    coerce = lambda val: val   对选中的值进行一次转换
    empty_value= ''            空值的默认值
 
MultipleChoiceField(ChoiceField)
    ...
 
TypedMultipleChoiceField(MultipleChoiceField)
    coerce = lambda val: val   对选中的每一个值进行一次转换
    empty_value= ''            空值的默认值
 
ComboField(Field)
    fields=()                  使用多个验证,如下:即验证最大长度20,又验证邮箱格式
                               fields.ComboField(fields=[fields.CharField(max_length=20), fields.EmailField(),])
 
MultiValueField(Field)
    PS: 抽象类,子类中可以实现聚合多个字典去匹配一个值,要配合MultiWidget使用
 
SplitDateTimeField(MultiValueField)
    input_date_formats=None,   格式列表:['%Y--%m--%d', '%m%d/%Y', '%m/%d/%y']
    input_time_formats=None    格式列表:['%H:%M:%S', '%H:%M:%S.%f', '%H:%M']
 
FilePathField(ChoiceField)     文件选项,目录下文件显示在页面中
    path,                      文件夹路径
    match=None,                正则匹配
    recursive=False,           递归下面的文件夹
    allow_files=True,          允许文件
    allow_folders=False,       允许文件夹
    required=True,
    widget=None,
    label=None,
    initial=None,
    help_text=''
 
GenericIPAddressField
    protocol='both',           both,ipv4,ipv6支持的IP格式
    unpack_ipv4=False          解析ipv4地址,如果是::ffff:192.0.2.1时候,可解析为192.0.2.1, PS:protocol必须为both才能启用
 
SlugField(CharField)           数字,字母,下划线,减号(连字符)
    ...
 
UUIDField(CharField)           uuid类型
    ...

注:UUID是根据MAC以及当前时间等创建的不重复的随机字符串

>>> import uuid

    # make a UUID based on the host ID and current time
    >>> uuid.uuid1()    # doctest: +SKIP
    UUID('a8098c1a-f86e-11da-bd1a-00112444be1e')

    # make a UUID using an MD5 hash of a namespace UUID and a name
    >>> uuid.uuid3(uuid.NAMESPACE_DNS, 'python.org')
    UUID('6fa459ea-ee8a-3ca4-894e-db77e160355e')

    # make a random UUID
    >>> uuid.uuid4()    # doctest: +SKIP
    UUID('16fd2706-8baf-433b-82eb-8c7fada847da')

    # make a UUID using a SHA-1 hash of a namespace UUID and a name
    >>> uuid.uuid5(uuid.NAMESPACE_DNS, 'python.org')
    UUID('886313e1-3b8a-5372-9b90-0c9aee199e5d')

    # make a UUID from a string of hex digits (braces and hyphens ignored)
    >>> x = uuid.UUID('{00010203-0405-0607-0809-0a0b0c0d0e0f}')

    # convert a UUID to a string of hex digits in standard form
    >>> str(x)
    '00010203-0405-0607-0809-0a0b0c0d0e0f'

    # get the raw 16 bytes of the UUID
    >>> x.bytes
    b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f'

    # make a UUID from a 16-byte string
    >>> uuid.UUID(bytes=x.bytes)
    UUID('00010203-0405-0607-0809-0a0b0c0d0e0f')

UUID

2. Django内置插件

TextInput(Input)
NumberInput(TextInput)
EmailInput(TextInput)
URLInput(TextInput)
PasswordInput(TextInput)
HiddenInput(TextInput)
Textarea(Widget)
DateInput(DateTimeBaseInput)
DateTimeInput(DateTimeBaseInput)
TimeInput(DateTimeBaseInput)
CheckboxInput
Select
NullBooleanSelect
SelectMultiple
RadioSelect
CheckboxSelectMultiple
FileInput
ClearableFileInput
MultipleHiddenInput
SplitDateTimeWidget
SplitHiddenDateTimeWidget
SelectDateWidget

内置插件

常用选择插件

# 单radio,值为字符串
# user = fields.CharField(
#     initial=2,
#     widget=widgets.RadioSelect(choices=((1,'上海'),(2,'北京'),))
# )
 
# 单radio,值为字符串
# user = fields.ChoiceField(
#     choices=((1, '上海'), (2, '北京'),),
#     initial=2,
#     widget=widgets.RadioSelect
# )
 
# 单select,值为字符串
# user = fields.CharField(
#     initial=2,
#     widget=widgets.Select(choices=((1,'上海'),(2,'北京'),))
# )
 
# 单select,值为字符串
# user = fields.ChoiceField(
#     choices=((1, '上海'), (2, '北京'),),
#     initial=2,
#     widget=widgets.Select
# )
 
# 多选select,值为列表
# user = fields.MultipleChoiceField(
#     choices=((1,'上海'),(2,'北京'),),
#     initial=[1,],
#     widget=widgets.SelectMultiple
# )
 
 
# 单checkbox
# user = fields.CharField(
#     widget=widgets.CheckboxInput()
# )
 
 
# 多选checkbox,值为列表
# user = fields.MultipleChoiceField(
#     initial=[2, ],
#     choices=((1, '上海'), (2, '北京'),),
#     widget=widgets.CheckboxSelectMultiple
# )
- 常用插件
            
            class RegisterForm(Form):
                name = fields.CharField(
                    widget=widgets.TextInput(attrs={'class': 'c1'})
                )
                email = fields.EmailField(
                    widget=widgets.EmailInput(attrs={'class':'c1'})
                )
                phone = fields.CharField(
                    widget=widgets.Textarea(attrs={'class':'c1'})
                )
                pwd = fields.CharField(
                    widget=widgets.PasswordInput(attrs={'class':'c1'})
                )
                pwd_confirm = fields.CharField(
                    widget=widgets.PasswordInput(attrs={'class': 'c1'})
                )
                # 单选:select
                # city = fields.ChoiceField(
                #     choices=[(0,"上海"),(1,'北京')],
                #     widget=widgets.Select(attrs={'class': 'c1'})
                # )
                # 多选:select
                # city = fields.MultipleChoiceField(
                #     choices=[(1,"上海"),(2,'北京')],
                #     widget=widgets.SelectMultiple(attrs={'class': 'c1'})
                # )
                
                # 单选:checkbox
                # city = fields.CharField(
                #     widget=widgets.CheckboxInput()
                # )

                # 多选:checkbox
                # city = fields.MultipleChoiceField(
                #     choices=((1, '上海'), (2, '北京'),),
                #     widget=widgets.CheckboxSelectMultiple
                # )

                # 单选:radio
                # city = fields.CharField(
                #     initial=2,
                #     widget=widgets.RadioSelect(choices=((1,'上海'),(2,'北京'),))
                # )
        
            注意:写默认值时,多选值对应列表
            
            # form = RegisterForm(initial={'city':[1,2],'name':'alex'})
            form = RegisterForm()

实例
  • 在使用选择标签时,需要注意choices的选项可以从数据库中获取,但是由于是静态字段 获取的值无法实时更新,那么需要自定义构造方法从而达到此目的。
<1>
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.ChoiceField(
        # choices=((1, '上海'), (2, '北京'),),
        initial=2,
        widget=widgets.Select
    )
 
    def __init__(self, *args, **kwargs):
        super(MyForm,self).__init__(*args, **kwargs)
        # self.fields['user'].widget.choices = ((1, '上海'), (2, '北京'),)
        # 或
        self.fields['user'].widget.choices = models.Classes.objects.all().value_list('id','caption')


<2> 使用django提供的ModelChoiceField和ModelMultipleChoiceField字段来实现
from django import forms
from django.forms import fields
from django.forms import widgets
from django.forms import models as form_model
from django.core.exceptions import ValidationError
from django.core.validators import RegexValidator
 
class FInfo(forms.Form):
    authors = form_model.ModelMultipleChoiceField(queryset=models.NNewType.objects.all())
    # authors = form_model.ModelChoiceField(queryset=models.NNewType.objects.all())

3.

自定义验证规则

<1> RegexValidator

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')],
    )

<2> 自定义类方法

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):
 
    # 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'}))

<3> 定义函数 clean_%s

# 通过 定义函数 clean_%s  (%s 是定义 form 类中的变量);
# djangon内部执行到form类中的一个变量后就会立即循环 clean_%s 函数进行执行;
# 如果form类变量中已经有 RegexValidator 验证方法了,则 RegexValidator 优先

from django import forms
    from django.forms import fields
    from django.forms import widgets
    from django.core.exceptions import ValidationError
    from django.core.validators import RegexValidator
 
    class FInfo(forms.Form):
        username = fields.CharField(max_length=5,
                                    validators=[RegexValidator(r'^[0-9]+$', 'Enter a valid extension.', 'invalid')], )
        email = fields.EmailField()
 
        def clean_username(self):
            """
            Form中字段中定义的格式匹配完之后,执行此方法进行验证
            :return:
            """
            value = self.cleaned_data['username']
            if "666" in value:
                raise ValidationError('666已经被玩烂了...', 'invalid')
            return value

<4> 同时生成多个标签进行验证

from django.forms import Form
from django.forms import widgets
from django.forms import fields
 
from django.core.validators import RegexValidator
 
 
############## 自定义字段 ##############
class PhoneField(fields.MultiValueField):
    def __init__(self, *args, **kwargs):
        # Define one message for all fields.
        error_messages = {
            'incomplete': 'Enter a country calling code and a phone number.',
        }
        # Or define a different message for each field.
        f = (
            fields.CharField(
                error_messages={'incomplete': 'Enter a country calling code.'},
                validators=[
                    RegexValidator(r'^[0-9]+$', 'Enter a valid country calling code.'),
                ],
            ),
            fields.CharField(
                error_messages={'incomplete': 'Enter a phone number.'},
                validators=[RegexValidator(r'^[0-9]+$', 'Enter a valid phone number.')],
            ),
            fields.CharField(
                validators=[RegexValidator(r'^[0-9]+$', 'Enter a valid extension.')],
                required=False,
            ),
        )
        super(PhoneField, self).__init__(error_messages=error_messages, fields=f, require_all_fields=False, *args,
                                         **kwargs)
 
    def compress(self, data_list):
        """
        当用户验证都通过后,该值返回给用户
        :param data_list:
        :return:
        """
        return data_list
 
############## 自定义插件 ##############
class SplitPhoneWidget(widgets.MultiWidget):
    def __init__(self):
        ws = (
            widgets.TextInput(),
            widgets.TextInput(),
            widgets.TextInput(),
        )
        super(SplitPhoneWidget, self).__init__(ws)
 
    def decompress(self, value):
        """
        处理初始值,当初始值initial不是列表时,调用该方法
        :param value:
        :return:
        """
        if value:
            return value.split(',')
        return [None, None, None]

<5> 整体验证, 获取 完 类的所有变量后 进行 clean 验证

# 整体验证: clean,必须有返回值,给指定字段添加错误信息

class RegisterForm(Form):
                name = fields.CharField()
                email = fields.EmailField()
                phone = fields.CharField()
                pwd = fields.CharField()
                pwd_confirm = fields.CharField()

                def clean(self):
                    pwd = self.cleaned_data['pwd']
                    pwd_confirm = self.cleaned_data['pwd_confirm']
                    if pwd == pwd_confirm:
                        return self.cleaned_data
                    else:
                        from django.core.exceptions import ValidationError
                        # self.add_error('pwd', ValidationError('密码输入不一致'))
                        self.add_error('pwd_confirm', ValidationError('密码输入不一致'))
                        return self.cleaned_data

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