Django 拓展点

发布时间：2020-12-15 17:13:15 所属栏目：大数据来源：网络整理

导读：1.?dispathch() from?django.views?import?Viewclass?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() ? f

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>

2.3 ?自定义功能 ? ? ? ?

Form中is_valid() ?full_clean() ? ? selef._post_clean

（编辑：李大同）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!