1. dispathch()
from django.views import View class CBV(View): def dispatch(self, request, *args, **kwargs): res = super(CBV, self).dispatch(request, **kwargs) return res
2. Form组件
2.1 单独字段验证 Form中is_valid() full_clean() self._clean_fields()
from django.shortcuts import render from django.shortcuts import redirect from django.shortcuts import HttpResponse from django import formsfrom django.forms import fieldsfrom django.forms import widgetsfrom django.core.exceptions import NON_FIELD_ERRORS, ValidationError class AjaxForm(forms.Form): username = fields.CharField() user_id = fields.IntegerField( widget=widgets.Select(choices=[(0,'alex'),(1,'tom'),(2,'lily'),]) ) # 自定义方法 clean_字段名 # 必须返回值self.cleaned_data['username'] # 如果出错:raise ValidationError('用户名已存在') def clean_username(self): v = self.cleaned_data['username'] if models.UserInfo.objects.filter(username=v).count(): # 整体错了 # 自己详细错误信息 raise ValidationError('用户名已存在') return v def clean_user_id(self): if models.UserInfo.objects.filter(id=self.cleaned_data['user_id']).count(): raise ValidationError('用户id存在') return self.cleaned_data['user_id'] def ajax(request): if request.method == 'GET': obj = AjaxForm() return render(request,'ajax.html',{'obj':obj}) else: ret = {'status':'杨建','message':None} import json obj = AjaxForm(request.POST) if obj.is_valid(): # 跳转到百度 # return redirect('http://www.baidu.com') # if .... # obj.errors['username'] = ['用户名已经存在',] # if .... # obj.errors['email'] = ['用户名已经存在',] ret['status'] = '钱' return HttpResponse(json.dumps(ret)) else: # print(type(obj.errors)) # print(obj.errors) from django.forms.utils import ErrorDict # print(obj.errors.as_ul()) # print(obj.errors.as_json()) # print(obj.errors.as_data()) ret['message'] = obj.errors # 错误信息显示在页面上 return HttpResponse(json.dumps(ret)) # -----------------------ajax.html---------------------- <body> <form id="fm" method="POST" action="/ajax/"> {% csrf_token %} {{ obj.as_p }} <input type="button" value="Ajax提交" id="btn" /> </form> <script src="/static/jquery-3.1.1.js"></script> <script> $(function () { $('#btn').click(function () { $.ajax({ url: '/ajax/', type: 'POST', data: $('#fm').serialize(), dataType: 'JSON', success:function (arg) { // arg: 状态，错误信息 if (arg.status == '钱'){ window.location.href = "http://www.baidu.com" } console.log(arg); } }) }) }) </script> </body>
2.2 整体字段验证 Form中is_valid() full_clean() self._clean_form()
#--------------------------------------views.py--------------------------------------
from django.shortcuts import render
from django.shortcuts import redirect
from django.shortcuts import HttpResponse
from django import formsfrom django.forms import fieldsfrom django.forms import widgetsfrom django.core.exceptions import NON_FIELD_ERRORS,'linly'),])
)
def clean(self):
value_dict = self.cleaned_data
v1 = value_dict.get('username')
v2 = value_dict.get('user_id')
if v1 == 'root' and v2==1:
raise ValidationError('整体错误信息')
return self.cleaned_data
def ajax(request):
if request.method == 'GET':
obj = AjaxForm()
return render(request,{'obj':obj})
else:
obj = AjaxForm(request.POST)
if obj.is_valid():
# -----------------------ajax.html----------------------
<body>
<form id="fm" method="POST" action="/ajax/">
{% csrf_token %}
{{ obj.as_p }}
<input type="button" value="Ajax提交" id="btn" />
</form>
<script src="/static/jquery-3.1.1.js"></script>
<script>
$(function () {
$('#btn').click(function () {
$.ajax({
url: '/ajax/', success:function (arg) {
// arg: 状态，错误信息
if (arg.status == '钱'){
window.location.href = "http://www.baidu.com"
}
console.log(arg);
}
})
})
})
</script>
</body>
Form中is_valid() full_clean() selef._post_clean
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