django Form表單

模板中生成一個form_obj對象：

from_obj=RegForm()

後端生成一個form_obj對象：

form_obj=RegForm(request.POST)

 

幫咱們作驗證的方法：

form_obj.is_valid()

以後就能夠拿到驗證後的數據：

from_obj.cleaned_data

 

 

 

 

Form表單功能介紹：

　　1 生成頁面可用的HTML標籤

　　2 對用戶提交的數據進行校驗

　　3 保留上次輸入內容

 

 

 

 

使用form組件：

　　先定義一個loginForm類

class LoginForm(forms.Form):
username = forms.CharField(min_length=8, label="用戶名")
pwd = forms.CharField(min_length=6, label="密碼")

def login2(request):
error_msg = ""
form_obj = LoginForm()
if request.method == "POST":
form_obj = LoginForm(request.POST)
if form_obj.is_valid():
username = form_obj.cleaned_data.get("username")
pwd = form_obj.cleaned_data.get("pwd")
if username == "Q1mi" and pwd == "123456":
return HttpResponse("OK")
else:
error_msg = "用戶名或密碼錯誤"
return render(request, "login2.html", {"form_obj": form_obj, "error_msg": error_msg})

 

 

 

經常使用字段與插件，

class LoginForm(forms.Form):
username = forms.CharField(
min_length=8,
label="用戶名",
initial="張三" # 設置默認值
)
pwd = forms.CharField(min_length=6, label="密碼")

 

錯誤信息：

class LoginForm(forms.Form):
username = forms.CharField(
min_length=8,
label="用戶名",
initial="張三",
error_messages={
"required": "不能爲空",
"invalid": "格式錯誤",
"min_length": "用戶名最短8位"
}
)
pwd = forms.CharField(min_length=6, label="密碼")

 

密碼：

class LoginForm(forms.Form):
...
pwd = forms.CharField(
min_length=6,
label="密碼",
widget=forms.widgets.PasswordInput(attrs={'class': 'c1'}, render_value=True)
)

 

圓形選擇框：

class LoginForm(forms.Form):
username = forms.CharField(
min_length=8,
label="用戶名",
initial="張三",
error_messages={
"required": "不能爲空",
"invalid": "格式錯誤",
"min_length": "用戶名最短8位"
}
)
pwd = forms.CharField(min_length=6, label="密碼")
gender = forms.fields.ChoiceField(
choices=((1, "男"), (2, "女"), (3, "保密")),
label="性別",
initial=3,
widget=forms.widgets.RadioSelect
)

 

單選select

class LoginForm(forms.Form):
...
hobby = forms.fields.ChoiceField(
choices=((1, "籃球"), (2, "足球"), (3, "雙色球"), ),
label="愛好",
initial=3,
widget=forms.widgets.Select
)

 

多選select

class LoginForm(forms.Form):
...
hobby = forms.fields.MultipleChoiceField(
choices=((1, "籃球"), (2, "足球"), (3, "雙色球"), ),
label="愛好",
initial=[1, 3],
widget=forms.widgets.SelectMultiple
)

 

單選盒子：

class LoginForm(forms.Form):
...
keep = forms.fields.ChoiceField(
label="是否記住密碼",
initial="checked",
widget=forms.widgets.CheckboxInput
)

 

多選checkbox

class LoginForm(forms.Form):
...
hobby = forms.fields.MultipleChoiceField(
choices=((1, "籃球"), (2, "足球"), (3, "雙色球"),),
label="愛好",
initial=[1, 3],
widget=forms.widgets.CheckboxSelectMultiple
)

 

關於choice的注意事項：

在使用選擇標籤時，須要注意choices的選項能夠從數據庫中獲取，可是因爲是靜態字段 ***獲取的值沒法實時更新***，那麼須要自定義構造方法從而達到此目的

有2種方法：

方法一：

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

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().values_list('id','caption')

 

方式二：

from django import forms
from django.forms import fields
from django.forms import models as form_model

class FInfo(forms.Form):
authors = form_model.ModelMultipleChoiceField(queryset=models.NNewType.objects.all())
# authors = form_model.ModelChoiceField(queryset=models.NNewType.objects.all())

 

校驗一：

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]+$', '請輸入數字'), RegexValidator(r'^159[0-9]+$', '數字必須以159開頭')],
)

 

校驗二：

import refrom django.forms import Formfrom django.forms import widgetsfrom django.forms import fieldsfrom django.core.exceptions import ValidationError # 自定義驗證規則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('手機號碼格式錯誤') class PublishForm(Form): title = fields.CharField(max_length=20, min_length=5, error_messages={'required': '標題不能爲空', 'min_length': '標題最少爲5個字符', 'max_length': '標題最多爲20個字符'}, widget=widgets.TextInput(attrs={'class': "form-control", 'placeholder': '標題5-20個字符'})) # 使用自定義驗證規則 phone = fields.CharField(validators=[mobile_validate, ], error_messages={'required': '手機不能爲空'}, widget=widgets.TextInput(attrs={'class': "form-control", 'placeholder': u'手機號碼'})) email = fields.EmailField(required=False, error_messages={'required': u'郵箱不能爲空','invalid': u'郵箱格式錯誤'}, widget=widgets.TextInput(attrs={'class': "form-control", 'placeholder': u'郵箱'}))