一、定義的規則
class TeacherForm(Form): #必須繼承Form # 創建字段，本質上是正則表達式 username = fields.CharField( required=True, #必填字段 error_messages={"required":"用戶名不能為空！！"}, #顯示中文錯誤提示 widget=widgets.TextInput(attrs={"placeholder":"用戶名","class":"form-control"}), #自動生成input框 label="姓名", label_suffix=":" ) password = fields.CharField(required=True, error_messages={'required': '密碼不能為空'}, widget=widgets.PasswordInput(attrs={'placeholder': '密碼', 'class': 'form-control'}), label="密碼", label_suffix=":" ) # 不能為空 email = fields.EmailField( required=True, error_messages={"required":"郵箱不能為空！！","invalid":"無效的郵箱"}, widget=widgets.EmailInput(attrs={"placeholder": "郵箱", "class": "form-control"}), # 自動生成input框 label = "郵箱", label_suffix = ":" ) #不能為空且郵箱格式要一致
頁面上渲染
用第二種方式需要加上下面的這個：
二、下拉框的規則
三、判斷用戶民是不存在，存在就不添加了
需要導入：
from django.core.exceptions import ValidationError
、
四、initial 修改時用到
五、自定義配置
1、在settings中：
2、導入settings
from django.conf import settings
3、使用
六、多對多修改兩種方式（用Form）
def editteacher(request,nid): obj = models.UserInfo.objects.filter(id=nid, ut_id=1).first() # print(obj.username) if not obj: return redirect("/teacherindex/") if request.method=="GET": print([obj.id for obj in obj.teacher_classes.all()]) #[2] 拿到select框的id是為了要做默認顯示的 form = TeacherForm(initial={"username":obj.username,"password":obj.password,"email":obj.email,"teacher_classes":[obj.id for obj in obj.teacher_classes.all()]}) #就讓顯示一個input框，並且帶有原來哪一行的內容 return render(request, "editteacher.html", {"form":form}) else: form = TeacherForm(data=request.POST) if form.is_valid():#開始校驗,注意這要加括號 cls_list = form.cleaned_data.pop("teacher_classes") print(cls_list) models.UserInfo.objects.filter(id=nid).update(**form.cleaned_data) obj.teacher_classes.set(cls_list) #更新第三張表 return redirect("/teacherindex/") else: return render(request, "editteacher.html", {"form":form})
七、多對多添加（用Form）
def addteacher(request): if request.method=="GET": form = TeacherForm() #只是讓顯示一個input框 return render(request, "addteacher.html", {"form":form}) else: form = TeacherForm(data=request.POST) # print(form) #<QuerySet [<UserInfo: UserInfo object>, <UserInfo: UserInfo object>, <UserInfo: UserInfo object>]> if form.is_valid():# 開始驗證 # print('執行成功',form.cleaned_data) # 所有匹配成功，字典 # # {'username': 'ghf', 'password': '435', 'email': 'fddfg@qq.com', 'teacher_classes': ['4']} cls_list = form.cleaned_data.pop("teacher_classes") print("============id",cls_list) form.cleaned_data['ut_id'] = 1 #創建新老師的對象 teacher_obj = models.UserInfo.objects.create(**form.cleaned_data) #創建新老師和班級的關系 teacher_obj.teacher_classes.add(*cls_list) #以前添加的是對象，現在也可以吧id添加進去 return redirect("/teacherindex/") else: # print("=====?",form.errors,type(form.errors))#返回失敗的結果 # print(form.errors["username"][0]) #拿到返回失敗的結果，渲染到頁面 return render(request, "addteacher.html", {"form":form})