Django中forms的三种形式写法

一、原生的form
In your models.py

class Account(models.Model):
    username=models.CharField('username',max_length=20);
    password=models.CharField('password',max_length=50);
    email=models.EmailField('email');

    class Meta:
        verbose_name='Account'
        verbose_name_plural=verbose_name

In your templates(register.html)

                <form action="" method="POST" class="" role="form">             
                   <div class="input-group">
                        <span class="input-group-addon" ><img src="{% static 'img/newuser.png' %}" alt="" width='24px'></span>
                        <input type="text" class="form-control" placeholder="your name" autofocus="" required="" name='username'>
                    </div>               
                    <div class="input-group">
                        <span class="input-group-addon"><img src="{% static 'img/email.png' %}" alt=""></span>
                        <input type="email" class="form-control" placeholder="your email" required="" name='email'>
                    </div>

                    <div class="input-group">
                        <span class="input-group-addon"><img src="{% static 'img/password_set.png' %}" alt=""></span>
                        <input type="password" class="form-control" placeholder="your password" required="" name='password_set'>
                    </div>

                    <div class="input-group">
                        <span class="input-group-addon"><img src="{% static 'img/password_confirm.png' %}" alt=""></span>
                        <input type="password" class="form-control" placeholder="confirm your password" required="" name='password_confirm'>
                    </div>

                    <input type="submit" name='register' value="Register" class="btn  btn-success btn-block">
                
                    {% csrf_token %}
                </form>

In your views.py

def register(request):
    context={}
    if request.method=='GET':
        return render(request,'register.html',context)
    else:
        username=request.POST.get('username')
        password_set=request.POST.get('password_set')
        password_confirm=request.POST.get('password_confirm')
        email=request.POST.get('email')
           #这里可以有更多的验证设置，或者前端验证后传过来
        if password_set==password_confirm:
            Account.objects.create(
                username=username,
                password=password_set,
                email=email,
                )
            return HttpResponse("Register Success")
        else:
            return HttpResponse("Your password is not match")

def login(request):
    context={}
    if request.method=='GET':
        return render(request,'login.html',context)
    else:
        username=request.POST.get('username')
        password=request.POST.get('password')
　　　　　　#验证用户
        user = Account.objects.filter(username__exact=username,password__exact=password)
        if user is not None :
            response=redirect(to='contact')
               #设置cookie,后面再讲cooki设置的其他实现方式，这里用手动
            response.set_cookie("username",username,max_age=3600)
            return response
        else:
            return HttpResponse("Login failed,please go back to try it again")

[需要额外添加验证步骤]

二、使用Django form

In your forms.py,

from django import forms

class Loginfm(forms.Form):
    # UI显示名称
    username=forms.CharField(label='用户')
    password=forms.CharField(label='密码')

In your views.py

from blogapp.forms import Loginfm
def login(request):
    context={}
    if request.method=='GET':
        loginfm=Loginfm()
        context["loginfm"]=loginfm
        
    else:
        loginfm=Loginfm(request.POST)
        if loginfm.is_valid():
            username=loginfm.cleaned_data['username']
            password=loginfm.cleaned_data['password']
               user = Account.objects.filter(username__exact=username,password__exact=password)
            if user is not None:
                response=redirect(to='contact')
                   response.set_cookie("username",username,max_age=3600)
                   return response 
            else:
return render(request,'login.html',context)

In your templates,

 <form action="" method="POST" class="" role="form">
          {{ loginfm.as_p }} 
          {% csrf_token %}
</form>

[Django根据字段属性可以对字段合法性进行检查，比较适合大量的补充信息提交，可以省去很多验证环节]

--自带样式较为有限,当然你也可以额外补充样式--

三、ModelForm

In your forms.py

from blogapp.models import User
class Loginfm(forms.ModelForm):
    # 绑定User类
    class Meta():
        model=User
        # 除了'ID'外全部显示，include('ID')只包含'ID',相反
        exclude=("id",'email')

In your views

def login(request):
    context={}
    if request.method=='GET':
        loginfm=Loginfm()
        context["loginfm"]=loginfm
    else:
        loginfm=Loginfm(request.POST)
        if loginfm.is_valid():
           # loginfm.save()
            return HttpResponse("Form submit success")
    return render(request,'login.html',context)

codes in your templates are the same as above(way2)