Reg_Form(request.POST) 使用form类来处理提交的数据来验证数据的合法性，is_valid()合法后的逻辑处理，验证后的数据保存在实例化后返回的cleaned_data中，
cleaned_data是个字典的数据格式，错误信息保存在form.errors中比如说想在views中查看所有报错信息print(f.errors),如果只想看用户的可以
print(form.errors['username'][0])
错误信息我们可以通过 模板渲染回前端页面，例
<form action="/form/" method="POST">
{% csrf_token %}
<div class="input-group">
{#接收后台传过来的form对象，自动生成input标签#}
{{ form.user }}
{#从后台传过来的error是字典，直接{{ error.user.0 }}呈现错误信息#}
{#如果后台返回了错误信息，将错误信息放入span标签，在页面显示，否则不显示#}
{% if error.username.0 %}
<span>{{ error.userusername.0 }}</span>
{% endif %}
</div>
<div class="input-group">
{{ form.password }}
{% if error.pwd.0 %}
<span>{{ error.password .0 }}</span>
{% endif %}
</div>
<div>
<input type="submit" value="提交" />
</div>
</form>
三.自生成input框
Form类
class RegisterForm(forms.Form):
style = 'form-control input-lg'
phone = forms.CharField(widget=forms.TextInput(attrs={'class': style,
'name': 'title'})),
required=True,
error_messages={'required': ugettext_lazy('*Required')})
code = forms.CharField(widget=forms.NumberInput(attrs={'placeholder': '验证码',
'class': style}),
min_length=4,
max_length=4,
required=True,
error_messages={'required': ugettext_lazy('*Required')})
password = forms.CharField(widget=forms.PasswordInput(attrs={'placeholder': '请输入密码',
'class': style}),
min_length=6,
required=True,
error_messages={'required': ugettext_lazy('*Required')})
views
def register(request):
if request.method == "POST":
f = RegisterForm(request.POST)
if f.is_valid():
user = f.cleaned_data["username"]
pwd = f.cleaned_data["password"]
code = f.cleaned_data["code"]
res_code = request.session.get("CheckCode", None)
result = models.UserInfo.objects.filter(user__exact=user,pwd__exact=pwd)
if code.upper() == res_code.upper() and result:
models.UserInfo.objects.filter(user__exact=user).update(status=1)
request.session["user"] = user
return redirect("/home")
else:
return render(request, "login.html", {"error": f.errors, "form": f})
else:
return render(request, "login.html", {"error": f.errors, "form": f})
else:
# 如果不是post提交数据，就不传参数创建对象，并将对象返回给前台，直接生成input标签，内容为空
f = Log_Form()
return render(request, "login.html", {"form": f})
