Django之表单验证

from django import forms
class FM(forms.Form):       #这里要接受后端需要的，不需要的数据不会关注
    required=‘不能为空‘
    username=forms.CharField(error_messages={‘required‘:required})  #表单中的name要与变量名一样
    pwd=forms.CharField(
        max_length=20,
        min_length=6,
        error_messages={‘required‘:required,
                        ‘min_length‘:‘密码长度不小于6‘,
                        ‘max_length‘:‘密码长度不大于20‘,
    }

    )
    email=forms.EmailField(
        error_messages={
            ‘required‘:required,
            ‘invalid‘:‘邮箱格式错误‘
        }
    )
def fn(request):
    if request.method==‘GET‘:
        obj=FM()
        return render(request,‘fn.html‘,{‘obj‘:obj})
    elif request.method==‘POST‘:
        obj = FM(request.POST)
        r1=obj.is_valid()       #判断是否成功
        if r1:
            print(obj.changed_data) #返回正确信息
        else:
            # print(obj.errors[‘username‘])       #否则返回错误信息
            return render(request,‘fn.html‘,{‘obj‘:obj})
        return render(request,‘fn.html‘)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form action="fn.html" method="POST">
        {% csrf_token %}
        <p>{{ obj.username}}{{ obj.errors.username.0 }}</p>
        <p>{{ obj.pwd }}{{ obj.errors.pwd.0 }}</p>
        <p>{{ obj.email }}{{ obj.errors.email.0 }}</p>
        <input type="submit" value="提交">
    </form>
</body>
</html>