注册功能1.渲染前端标签获取用户输入      >>>            渲染标签2.获取用户输入传递到后端校验    >>>            校验数据3.校验未通过展示错误信息        >>>            展示信息校验数据(前后端都可以校验)校验前端后端都可以做，但是前端可以不做，后端必须得做!!!django form组件1.渲染标签2.校验数据3.展示信息校验数据第一步需要在views中写一个form类from django import formsclass MyForm(forms.Form):name = forms.CharField(max_length=6)password = forms.CharField(max_length=8,min_length=3)email = forms.EmailField(required=True)第二步实例化form对象form_obj = MyForm({'name':'jason'})第三步查看数据校验是否合法form_obj.is_valid()  # 只有当所有的字段都校验通过才会返回True
            第四步查看校验错误的信息form_obj.errors  # 这个里面放的是所有校验未通过的字段及错误提示"""{'name': ['Ensure this value has at most 6 characters (it has 7).'], 'password': ['Ensure this value has at least 3 characters (it has 2).'], 'email': ['Enter a valid email address.']}"""第五步查看校验通过的数据form_obj.cleaned_data  # 符合校验规则数据都会被放到该对象中
            ps:form组件校验数据的规则从上往下依次取值校验校验通过的放到cleaned_data校验失败的放到errors注意:form中所有的字段默认都是必须传值的(required=True)校验数据的时候可以都传(多传的数据不会做任何的校验>>>不会影响form校验规则)渲染标签form组件只帮你渲染获取用户输入的标签,不会帮你渲染提交按钮，需要手动添加<h1>第一种渲染方式(可扩展性较差)</h1>{{ form_obj.as_p }}{{ form_obj.as_ul }}<h1>第二种渲染方式</h1><form action=""><p>{{ form_obj.name.label }}{{ form_obj.name }}</p><p>{{ form_obj.password.label }}{{ form_obj.password }}</p><p>{{ form_obj.email.label }}{{ form_obj.email }}</p><input type="submit"></form><h1>第三种渲染标签的方式</h1><form action="">{% for foo in form_obj %}<p>{{ foo.label }}{{ foo }}</p>{% endfor %}</form>前端取消校验 参数 novalidate<form action="" method="post" novalidate></form>form组件提交数据如果数据不合法，页面上会保留之前用户输入的信息在使用form组件对模型表进行数据校验的时候，只需要保证字段一致那么在创建的对象的时候你就直接**form_obj.cleaned_data<form action="" method="post" novalidate>{% for foo in form_obj %}<p>{{ foo.label }}{{ foo }}<span>{{ foo.errors.0 }}</span></p>{% endfor %}<input type="submit"></form># 钩子函数# 局部钩子函数  （单个字段的校验利用局部钩子函数）def clean_name(self):name = self.cleaned_data.get('name')if '666' in name:self.add_error('name','光喊666是不行的，要有真实力!')return name  # return还是要加上的，兼容性考虑# 全局钩子函数  （多个字段的校验利用全局钩子函数）def clean(self):password = self.cleaned_data.get('password')confirm_password = self.cleaned_data.get('confirm_password')if not password == confirm_password:self.add_error('confirm_password',"两次密码不一致，你这个dsb!")return self.cleaned_data# 设置标签样式from django import formsfrom django.forms import widgetspassword = forms.CharField(max_length=8,min_length=3,error_messages={'max_length': '密码最长8位','required': '密码不能为空','min_length':'密码最少3位'},widget=widgets.PasswordInput(attrs={'class':'c1 form-control'}))hobby = forms.ChoiceField(choices=((1, "篮球"), (2, "足球"), (3, "双色球"),),label="爱好",initial=3,widget=forms.widgets.Select())hobby1 = forms.MultipleChoiceField(choices=((1, "篮球"), (2, "足球"), (3, "双色球"),),label="爱好",initial=[1, 3],widget=forms.widgets.SelectMultiple())keep = forms.ChoiceField(label="是否记住密码",initial="checked",widget=forms.widgets.CheckboxInput())

class RegForm(forms.Form):name = forms.CharField(max_length=10,min_length=3,label='用户名', error_messages={'required':'用户名不能为空!','invalid':'格式错误！','max_length':'注册用户名长度不能超过10位！','min_length':'注册用户名长度不能低于3位',},widget=forms.widgets.Input(attrs={'class':'form-control','style':'width:250px'},))password = forms.CharField(max_length=16,min_length=3,label='密码', error_messages={'required':'注册密码不能为空！','invalid':'格式错误！','max_length':'密码超出最大长度16位！','min_length':'密码长度不能低于3位！'},widget=forms.widgets.PasswordInput(attrs={'class':'form-control','style':'width:250px'}))re_password = forms.CharField(max_length=16, min_length=3,label='再次输入密码', error_messages={'required': '注册密码不能为空！','invalid': '格式错误！','max_length': '密码超出最大长度16位！','min_length': '密码长度不能低于3位！'},widget=forms.widgets.PasswordInput(attrs={'class': 'form-control', 'style': 'width:250px'}))cellphone = forms.CharField(max_length=14,min_length=10,label='请输入手机号',error_messages={'required': '注册手机号不能为空！','invalid': '格式错误！','max_length': '手机号长度不合法！','min_length': '手机号长度不合法！'},widget=forms.widgets.Input(attrs={'class':'form-control','style':'width:250px','id':'cellphone'}))def clean_name(self):name = self.cleaned_data.get("name")if not name.isalpha():self.add_error('name','用户名必须由字母数字组成！')elif name[0].isdigit():self.add_error('name','用户名不能以数字开头！')elif models.User.objects.filter(name=name):self.add_error('name','该用户名已存在！')return namedef clean(self):password = self.cleaned_data.get("password")re_password = self.cleaned_data.get('re_password')if password != re_password:self.add_error('re_password','两次密码不一致！')elif password == '123':self.add_error('password','当前密码过于简单！')return self.cleaned_datadef clean_cellphone(self):cellphone = self.cleaned_data.get("cellphone")regExp = "^((13[0-9])|(15[^4])|(18[0,2,3,5-9])|(17[0-8])|(147))\\d{8}$"if not re.findall(regExp,cellphone):self.add_error('cellphone','请输入正确的手机号！')elif models.User.objects.filter(cellphone = cellphone):self.add_error('cellphone','该手机号已注册！请换一个再试！')return cellphone

<body>
<div class="container" id="particles-js"><div id="main-div"><h3 style="text-align: center">欢迎注册图书管理系统</h3><form action="" method="post" style="width: 250px;margin: 20px auto"  autocomplete="off"  novalidate>{% for form_datum in form_data %}               <p>{{ form_datum.label }}{{ form_datum }}<span style="color: red">{{ form_datum.errors.0 }}</span></p>{% endfor %}<span>请输入验证码:</span><p ><input type="text" class="form-control" name="yzm" style="width: 120px;display:inline-block;"><input href="#" class="btn btn-info feachBtn"  style="width: 130px;float: right;" value="获取手机验证码"></p><span style="color: red">{{ yzm }}</span><p style="padding: 10px 0;"><input type="submit" class="btn btn-info btn-block" value="注册"></p></form></div>
</div>
</body>

def register(request):form_data = RegForm()if request.method == "POST":form_data = RegForm(request.POST)if form_data.is_valid():            #检查是否通过校验，没有则返回前端error信息，通过则注册dic = dict(form_data.cleaned_data)dic["user_type"] = 'user'dic.pop('re_password')# dic['cellphone'] = request.session.get("cellphone")models.User.objects.create(**dic)return redirect('/admins/show-book/')return render(request, "reg.html",locals())