Django(form表单)

--------------login.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="/login/" method="post">
    <p><input type="text" value="用户名" name="username"><span>{{ oo.errors.username.0 }}</span>
    </p>
    <p><input type="text" value="邮箱" name="email"><span>{{ oo.errors.email.0 }}</span>
    </p>

    <input type="submit" value="提交">
</form>
</body>
</html>

--------------urls.py

urlpatterns = [
    path('admin/', admin.site.urls),
    path('login/',views.login),

]

----------------views.py(创建模板类FormData继承于forms.Form)

from django import forms
# Create your views here.

class FormData(forms.Form):
    username=forms.CharField(max_length=6,error_messages={"required":"用户名不能为空","max_length":"长度不能大于6"})
    email=forms.EmailField(error_messages={"invalid":"邮箱格式错误"})
def login(req):
    if req.method=="GET":return render(req,"login.html")
    elif req.method=="POST":
        # obj=FormData(req.POST)
        # status=obj.is_valid()     #验证是否成功，如果有其中某一个出错，返回false
        # print(status)
        # print(obj.clean())        #拿到验证成功后的值（只拿正确的值，错误的不拿，如果都错了拿到的值为空）
        # print(obj.errors.as_json) #拿到错误信息


        #平常使用
        obj=FormData(req.POST)
        if obj.is_valid():           #如果验证成功
            print(obj.clean())       #输出拿到的正确信息
        else:
            print(obj.errors.as_json)#如果验证错误输出错误信息
            u=obj.errors['username'][0]
            e=obj.errors["email"][0]
        return render(req,"login.html",{"oo":obj})

因为点击提交按钮，界面会刷新，填入的数据会消失，所以有以下方法

---------------login.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="/login/" method="post">
    <p> 
        {{ oo.username }}                             //此处oo不能变，username是模板FormData中的字段
        <span>{{ oo.errors.username.0 }}</span>
    </p>
    <p>
        {{ oo.email }}
        <span>{{ oo.errors.email.0 }}</span>
    </p>

    <input type="submit" value="提交">
</form>
</body>
</html>

---------------views.py

from django import forms
# Create your views here.

class FormData(forms.Form):
    username=forms.CharField(max_length=6,error_messages={"required":"用户名不能为空","max_length":"长度不能大于6"})
    email=forms.EmailField(error_messages={"invalid":"邮箱格式错误"})
def login(req):
    if req.method=="GET":
        obj=FormData()
        return render(req,"login.html",{"oo":obj})
    elif req.method=="POST":
        #平常使用
        obj=FormData(req.POST)
        if obj.is_valid():           #如果验证成功
            print(obj.clean())       #输出拿到的正确信息
        else:
            print(obj.errors.as_json)#如果验证错误输出错误信息
            u=obj.errors['username'][0]
            e=obj.errors["email"][0]
        return render(req,"login.html",{"oo":obj})

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