前端登陆界面（重点是js操作--接收到后台发来的错误信息怎么在页面显示出来）
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> </head> <body> <h1>用户登录</h1> <form id="f1" action="/login/" method="POST"> {% csrf_token %} <p> <input type="text" name="user" />{{ obj.errors.user.0 }} </p> <p> <input type="password" name="pwd" />{{ obj.errors.pwd.0 }} </p> <input type="submit" value="提交" /> <a onclick="submitForm();">提交</a> </form> <script src="/static/jquery-1.12.4.js"></script> <script> function submitForm(){ $('.c1').remove(); $.ajax({ url: '/ajax_login/', type: 'POST', data: $('#f1').serialize(),// user=alex&pwd=456&csrftoen=dfdf dataType:"JSON", success:function(arg){ console.log(arg); if(arg.status){ }else{ $.each(arg.msg,function(index,value){ console.log(index,value); var tag = document.createElement('span'); tag.innerHTML = value[0]; tag.className = 'c1'; $('#f1').find('input[name="'+ index +'"]').after(tag); }) } } }) } </script> </body> </html>
views.py中接收数据并作验证，然后把错误信息返回给前端
from django.shortcuts import render,redirect,HttpResponse from django.forms import Form from django.forms import fields from django.forms import widgets class LoginForm(Form): user = fields.CharField(required=True) pwd = fields.CharField(min_length=18) def login(request): if request.method == 'GET': return render(request,'login.html') else: obj = LoginForm(request.POST) if obj.is_valid(): print(obj.cleaned_data) return redirect('http://www.baidu.com') return render(request,'login.html',{'obj': obj}) ajax接收并发送数据 def ajax_login(request): import json ret = {'status': True,'msg': None} obj = LoginForm(request.POST) if obj.is_valid(): print(obj.cleaned_data) else: # print(obj.errors) # obj.errors对象 ret['status'] = False ret['msg'] = obj.errors v = json.dumps(ret) return HttpResponse(v) # # class TestForm(Form): # t1 = fields.CharField( # required=True, # max_length=8, # min_length=2, # error_messages={ # 'required': '不能为空', # 'max_length': '太长', # 'min_length': '太短', # } # ) # t2 = fields.IntegerField( # min_value=10, # max_value=1000, # error_messages={ # 'required': 't2不能为空', # 'invalid': 't2格式错误，必须是数字', # 'min_value': '必须大于10', # 'max_value': '必须小于1000', # }, # ) # t3 = fields.EmailField( # error_messages={ # 'required': 't3不能为空', # 'invalid': 't3格式错误，必须是邮箱格式', # } # ) class TestForm(Form): t1 = fields.CharField(required=True,max_length=8,min_length=2, error_messages={ 'required': '不能为空', 'max_length': '太长', 'min_length': '太短', } ) t2 = fields.EmailField() def test(request): if request.method == "GET": obj = TestForm() return render(request,'test.html',{'obj': obj}) else: obj = TestForm(request.POST) if obj.is_valid(): print(obj.cleaned_data) else: print(obj.errors) return render(request,'test.html',{'obj':obj}) class RegiterForm(Form): user = fields.CharField(min_length=8) email = fields.EmailField() password = fields.CharField() phone = fields.RegexField('139d+') def register(request): if request.method == 'GET': obj = RegiterForm() return render(request,'register.html',{'obj':obj}) else: obj = RegiterForm(request.POST) if obj.is_valid(): print(obj.cleaned_data) else: print(obj.errors) return render(request,'register.html',{'obj':obj})