Django的form组件——自定义校验函数

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from django.shortcuts import render,HttpResponse from django import forms from django.core.exceptions import ValidationError     #校验错误     class UserInfo(forms.Form):       username = forms.CharField(         label='用户名',         required=True,     )       password = forms.CharField(         label='密码',         widget=forms.widgets.PasswordInput(render_value=True)     )       def clean_username(self):    #此处自定义一个校验规则的函数：用户名不能含有admin         value = self.cleaned_data.get("username")   #获取输入的username的值         if "admin" in value:        #如果包含了admin             raise ValidationError("用户名不能含有敏感信息")   #则返回错误信息     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('检验通过')         else:             print(u_obj.errors)             return render(request, 'test.html', {'u_obj': u_obj})

　　

上面是在class的内部定义方法，还可以在class类的外部定义函数，如下：

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from django.shortcuts import render,HttpResponse from django import forms from django.core.exceptions import ValidationError     #校验错误   #自定义一个校验的函数，如果长度大于6，则抛出错误信息 def max_num(n):     if len(n) > 6:         raise ValidationError('太长了')     class UserInfo(forms.Form):       username = forms.CharField(         label='用户名',         required=True,           #validators：自定义校验         validators=[max_num]    #在此处使用自定义的函数，检验时，会自动将输入的值作为参数传入函数中，并进行校验和返回错误信息     )         password = forms.CharField(         label='密码',         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('检验通过')         else:             print(u_obj.errors)             return render(request, 'test.html', {'u_obj': u_obj})