Django的form元件——自定義校驗函式

from django.shortcuts import render,HttpResponse

from django import forms

from django.core.exceptions import ValidationError     #校驗錯誤

class UserInfo(forms.Form):

    username = forms.CharField(

        label='使用者名稱',

        required=True,

    )

    password = forms.CharField(

        label='密碼',

        widget=forms.widgets.PasswordInput(render_value=True)

    )

    def clean_username(self):    #此處自定義一個校驗規則的函式：使用者名稱不能含有admin

        value = self.cleaned_data.get("username")   #獲取輸入的username的值

        if "admin" in value:        #如果包含了admin

            raise ValidationError("使用者名稱不能含有敏感資訊")   #則返回錯誤資訊

def test(request):

    if request.method == 'GET':

        u_obj = UserInfo()

        return render(request, 'test.html', {'u_obj': u_obj})

    else:

        u_obj = UserInfo(request.POST)

        if u_obj.is_valid():

            print(u_obj.cleaned_data)

            return HttpResponse('檢驗通過')

        else:

            print(u_obj.errors)

            return render(request, 'test.html', {'u_obj': u_obj})

from django.shortcuts import render,HttpResponse

from django import forms

from django.core.exceptions import ValidationError     #校驗錯誤

#自定義一個校驗的函式，如果長度大於6，則丟擲錯誤資訊

def max_num(n):

    if len(n) > 6:

        raise ValidationError('太長了')

class UserInfo(forms.Form):

    username = forms.CharField(

        label='使用者名稱',

        required=True,

        #validators：自定義校驗

        validators=[max_num]    #在此處使用自定義的函式，檢驗時，會自動將輸入的值作為引數傳入函式中，並進行校驗和返回錯誤資訊

    )

    password = forms.CharField(

        label='密碼',

        widget=forms.widgets.PasswordInput(render_value=True)

    )

def test(request):

    if request.method == 'GET':

        u_obj = UserInfo()

        return render(request, 'test.html', {'u_obj': u_obj})

    else:

        u_obj = UserInfo(request.POST)

        if u_obj.is_valid():

            print(u_obj.cleaned_data)

            return HttpResponse('檢驗通過')

        else:

            print(u_obj.errors)

            return render(request, 'test.html', {'u_obj': u_obj})