Django forms组件的使用教程

编写Django的form表单，非常类似我们在模型系统里编写一个模型。在模型中，一个字段代表数据表的一列，而form表单中的一个字段代表

视图函数：register

# forms组件
from django.forms import widgets

wid_01=widgets.TextInput(attrs={"class":"form-control"})
wid_02=widgets.PasswordInput(attrs={"class":"form-control"})

class UserForm(forms.Form):
  name=forms.CharField(max_length=32,
      widget=wid_01
      )
  pwd=forms.CharField(max_length=32,widget=wid_02)
  r_pwd=forms.CharField(max_length=32,widget=wid_02)
  email=forms.EmailField(widget=wid_01)
  tel=forms.CharField(max_length=32,widget=wid_01)

def register(request):

  if request.method=="POST":
    form=UserForm(request.POST)
    if form.is_valid():
      print(form.cleaned_data)    # 所有干净的字段以及对应的值
    else:
      print(form.cleaned_data)    #
      print(form.errors)# ErrorDict : {"校验错误的字段":["错误信息",]}
      print(form.errors.get("name")) # ErrorList ["错误信息",]
    return HttpResponse("OK")
  form=UserForm()
  return render(request,"register.html",locals())

1，渲染标签功能

渲染方式1

  
  
  
  


注册页面

  
    

 
    
  

渲染方式2

渲染方式3

2，显示错误与重置输入信息功能

视图

def register(request):

  if request.method=="POST":
    form=UserForm(request.POST)
    if form.is_valid():
      print(form.cleaned_data)    # 所有干净的字段以及对应的值
    else:
      print(form.cleaned_data)    #
      print(form.errors)# ErrorDict : {"校验错误的字段":["错误信息",]}
      print(form.errors.get("name")) # ErrorList ["错误信息",]
    return render(request,"register.html",locals())
  form=UserForm()
  return render(request,"register.html",locals())

模板

3，局部钩子与全局钩子

模板

# forms组件
from django.forms import widgets

wid_01=widgets.TextInput(attrs={"class":"form-control"})
wid_02=widgets.PasswordInput(attrs={"class":"form-control"})

from django.core.exceptions import ValidationError
class UserForm(forms.Form):
  name=forms.CharField(max_length=32,
      widget=wid_01
      )
  pwd=forms.CharField(max_length=32,widget=wid_02)
  r_pwd=forms.CharField(max_length=32,widget=wid_02)
  email=forms.EmailField(widget=wid_01)
  tel=forms.CharField(max_length=32,widget=wid_01)

  # 局部钩子
  def clean_name(self):
    val=self.cleaned_data.get("name")
    if not val.isdigit():
      return val
    else:
      raise ValidationError("用户名不能是纯数字!")

  # 全局钩子

  def clean(self):
    pwd=self.cleaned_data.get("pwd")
    r_pwd=self.cleaned_data.get("r_pwd")

    if pwd==r_pwd:
      return self.cleaned_data
    else:
      raise ValidationError('两次密码不一致!')

def register(request):

  if request.method=="POST":
    form=UserForm(request.POST)
    if form.is_valid():
      print(form.cleaned_data)    # 所有干净的字段以及对应的值
    else:
      clean_error=form.errors.get("__all__")

    return render(request,"register.html",locals())
  form=UserForm()
  return render(request,"register.html",locals())

视图

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