from django.shortcuts import render,redirect from django.forms import Form,fields class loginForm(Form):
#自定义正则规则， username = fields.CharField(max_length=16,min_length=6,required=True,error_messages={'max_length':'太长了'}) password = fields.CharField(max_length=16, min_length=6, required=True, error_messages={'max_length': '太太长了了'}) # Create your views here. def test(request): if request.method =='GET': return render(request, 'login.html') else: obj = loginForm(request.POST) #创建Form类的对象时，需要传入待匹配的数据 v = obj.is_valid() #开始将提交的数据与class定义的规则进行匹配，返回true或者false if v==True: print(obj.cleaned_data) #正确的信息，字典形式 return redirect('http://www.baidu.com') else: print(obj.errors['username'][0]) #错误信息，字典形式 return render(request, 'login.html',{'obj':obj})
前端html：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <div> <form method="POST" action="/test/"> {% csrf_token %} <p> 用户名：<input type="text" name="username"/>{{ obj.errors.username.0 }} </p> <p> 密码：<input type="text" name="password"/> </p> <input type="submit" value="登陆"/> </form> </div> </body> </html>