标签：字典 错误 attrs 最新版本 def widget 实例 验证 密码
index.html
<form action="" method="post">
{% csrf_token %}
<p>用户名<input type="text" name="username"></p>
<p>密码<input type="password" name="password"></p>
<p>确认密码<input type="password" name="r_password"></p>
<p>邮箱<input type="email" name="email"></p>
<input type="submit">
</form>views.py（forms暂时先放在views.py,为了程序可读性更高应新建一个.py文件）
from django import forms
# 先定义forms组件类
class UserForm(forms.Form):
username = forms.CharField(min_length=6)
password = forms.CharField(min_length=6)
r_password = forms.CharField(min_length=6)
email = forms.EmailField()
def index(request):
if request.method == ‘POST‘:
# 实例化form组件类的时候传入的参数要求：form表单name的属性必须与forms组件的字段名称相同
form = UserForm(request.POST) #传入的是一个字典:{‘username‘:‘alexss}
print(form.is_valid())# 布尔类型
if form.is_valid(): # 判断是否校验成功（传入的参数规则能对应上类中的规则# ）
# 如果传入了一个类中没有定义的字段，则不会去进行校验，直接忽视
print(form.cleaned_data) # 校验成功的字段放在该字典内
else:
print(form.changed_data) # 同样，校验成功的会在该字典内
print(form.errors) # 校验失败的会放在该字典内，存放格式：字段名对应一个字段，字典内是错误信息
return HttpResponse(‘OK‘)
return render(request,‘index.html‘)方式1：
views.py
from django import forms
# 先定义forms组件类
class UserForm(forms.Form):
username = forms.CharField(min_length=6)
password = forms.CharField(min_length=6)
r_password = forms.CharField(min_length=6)
email = forms.EmailField()
def index(request):
form = UserForm()
return render(request,‘index.html‘,locals())index.html
<form action="" method="post">
<p>
用户名{{ form.username }}
</p>
<p>
密码{{ form.password }}
</p>
<p>
确认密码{{ form.r_password }}
</p>
<p>
邮箱{{ form.email }}
</p>
<input type="submit">
</form>方式2:在views.py中定义字段可以添加label属性，在渲染标签时，默认的form.label是字段名，可以在定义form是设置label属性
views.py
from django import forms
# 先定义forms组件类
class UserForm(forms.Form):
username = forms.CharField(min_length=6,label=‘用户名‘)
password = forms.CharField(min_length=6,label=‘密码‘)
r_password = forms.CharField(min_length=6,label=‘确认密码‘)
email = forms.EmailField(label=‘密码‘)
def index(request):
form = UserForm()
return render(request,‘index.html‘,locals())index.html
<h3>forms组件渲染标签方式2</h3>
<form action="" method="post">
{% for filed in form %}
<div>
<label for="">{{ filed.label }}</label>
{{ filed }}
</div>
{% endfor %}
<input type="submit">
</form>方式3:该方式不推荐使用，过于呆滞
<form action="" method="post">
{{ form.as_p }}
<input type="submit">
</form><h3>form组件渲染标签方式1</h3>
<form action="" method="post">
{% csrf_token %}
<p>{{ form.username.label }}
{{ form.username }} <span>{{ form.username.errors.0 }}</span>
</p>
<p>{{ form.password.label }}
{{ form.password }} <span>{{ form.password.errors.0 }}</span>
</p>
<p>{{ form.r_password.label }}
{{ form.r_password }} <span>{{ form.r_password.errors.0 }}</span>
</p>
<p>{{ form.email.label }}
{{ form.email }} <span>{{ form.email.errors.0 }}</span>
</p>
<input type="submit">
</form>最新版本的django好像不需要forms组件去渲染，在输入时会自动进行校验，假如提交时不符合会弹出提示
渲染时使密码输入框显示秘文
from django import forms
from django.forms import widgets
# 先定义forms组件类
class UserForm(forms.Form):
username = forms.CharField(min_length=6,label=‘用户名‘)
password = forms.CharField(min_length=6,label=‘密码‘,widget=widgets.PasswordInput())
# 在定义类时添加widget属性=widgets.PasswordInput()
r_password = forms.CharField(min_length=6,label=‘确认密码‘,widget=widgets.PasswordInput())
email = forms.EmailField(label=‘密码‘)渲染时给输入框添加样式类
class UserForm(forms.Form):
username = forms.CharField(min_length=6,label=‘用户名‘,widget=widgets.TextInput(attrs={"class":"form-control"}))
password = forms.CharField(min_length=6,label=‘密码‘,widget=widgets.PasswordInput(attrs={"class":"form-control"}))
r_password = forms.CharField(min_length=6,label=‘确认密码‘,widget=widgets.TextInput(attrs={"class":"form-control"}))
email = forms.EmailField(label=‘密码‘,widget=widgets.TextInput(attrs={"class":"form-control"}))验证用户名与邮箱用户名是否存在
class UserForm(forms.Form):
username = forms.CharField(min_length=4,label=‘用户名‘,widget=widgets.TextInput(attrs={"class":"form-control"}))
password = forms.CharField(min_length=4,label=‘密码‘,widget=widgets.PasswordInput(attrs={"class":"form-control"}))
r_password = forms.CharField(min_length=4,label=‘确认密码‘,widget=widgets.TextInput(attrs={"class":"form-control"}))
email = forms.EmailField(label=‘邮箱‘,widget=widgets.TextInput(attrs={"class":"form-control"}))
def clean_username(self):
val = self.cleaned_data.get(‘username‘)
ret = UserInfo.objects.filter(username=val)
if not ret:
return val
else:
raise ValidationError("用户名已存在")
def clean_email(self):
val = self.cleaned_data.get(‘email‘)
ret = UserInfo.objects.filter(email=val)
if not ret:
return val
else:
raise ValidationError("邮箱已存在")
class UserForm(forms.Form):
username = forms.CharField(min_length=4,label=‘用户名‘,widget=widgets.TextInput(attrs={"class":"form-control"}))
password = forms.CharField(min_length=4,label=‘密码‘,widget=widgets.PasswordInput(attrs={"class":"form-control"}))
r_password = forms.CharField(min_length=4,label=‘确认密码‘,widget=widgets.PasswordInput(attrs={"class":"form-control"}))
email = forms.EmailField(label=‘邮箱‘,widget=widgets.TextInput(attrs={"class":"form-control"}))
# 全局钩子
def clean(self):
pwd1 = self.cleaned_data.get(‘password‘)
pwd2 = self.cleaned_data.get(‘r_password‘)
if pwd1 == pwd2:
return self.cleaned_data
else:
raise ValidationError(‘两次密码输入不一致‘)全局钩子捕获异常是使用form.error.get(‘all‘)
标签：字典 错误 attrs 最新版本 def widget 实例 验证 密码
原文地址：https://www.cnblogs.com/wualin/p/10125641.html
