一基本流程

1 创建form组件对应的类，比如LoginForm

2 前端的三种渲染方式：

渲染方式三种：1
     
          {% csrf_token %}    {
    { form_obj.as_p }}    
      
     
2
     
          {% csrf_token %}    
              
       用户名        {
    { form_obj.user }} 
       {
    { form_obj.errors.user.0 }}    
      
    
              
       密码        {
    { form_obj.pwd }}
       {
    { form_obj.errors.pwd.0 }}    
      
    
      
     
3
     
          {% csrf_token %}    {% for field in form_obj %}        
                  
       {
    { field.label }}            {
    { field }}        
      
    {% endfor %}

二注册校验

from django.core.exceptions import NON_FIELD_ERRORS, ValidationError

from django.forms import widgets

1 class RegForm(forms.Form): 2     user = forms.CharField(max_length=18, min_length=3, 3                            error_messages={ 4                                'required': '不能为空', 5                                'min_length': 'too short', 6                                'max_length': "too long" 7                            }) 8     pwd = forms.CharField(max_length=32, min_length=3, 9                           error_messages={10                               'max_length': "too long",11                               'required': '不能为空',12                               'min_length': 'too short',13                           },14                           widget=widgets.PasswordInput(attrs={}))15     repeat_pwd = forms.CharField(label='确认密码',16                                  max_length=32,17                                  error_messages={},18                                  widget=widgets.PasswordInput(attrs={}))19     email = forms.EmailField(20         error_messages={21             "invalid": '格式错误'22         }23     )24 25     tel = forms.CharField()26 27     def clean_user(self):28         val = self.cleaned_data.get("user")29         ret = Userinfo.objects.filter(name=val)30         if not ret:31             return val32         else:33             raise ValidationError("该用户已经注册")34 35     def clean_tel(self):36         val = self.cleaned_data.get('tel')37         import re38         ret = re.search("1[356789]\d{9}$", val)39         if ret:40             return val41         else:42             raise ValidationError("手机号格式错误")43 44     def clean(self):45         pwd = self.cleaned_data.get('pwd')46         repeat_pwd = self.cleaned_data.get('repeat_pwd')47         if pwd == repeat_pwd:48             return self.cleaned_data49         else:50             raise ValidationError("两次密码不一致")

forms

1 def reg(request): 2     if request.method == 'POST': 3         reg_form = RegForm(request.POST) 4         if reg_form.is_valid(): 5             print(reg_form.cleaned_data)  # dict 6             name = reg_form.cleaned_data.get("user") 7             pwd = reg_form.cleaned_data.get("pwd") 8             Userinfo.objects.create(name=name, pwd=pwd) 9 10             return redirect('/login/')  # 注册成功去登录11         else:12             all_error = reg_form.errors.get("__all__")13             return render(request, 'reg.html', locals())14 15     reg_form = RegForm()16     return render(request, 'reg.html', {
    'reg_form': reg_form})

views

1  2 注册页面
 3 
      
        4     {% csrf_token %} 5     {% for field in reg_form %} 6         
       
         7             
        {
    { field.label }} 8             {
    { field }}
        {
    { field.errors.0 }} 9             {% if field.label == '确认密码' %}10                 
        {
    { all_error.0 }}11             {% endif %}12         
       
13     {% endfor %}14     
       15 
      
16