django之forms组件

以下是forms的例子,展现出forms的作用:

 

from django.shortcuts import render,HttpResponse

# Create your views here.
from django.core.exceptions import NON_FIELD_ERRORS, ValidationError

from django import forms
#
# class BookForm(forms.Form):
#     title=forms.CharField(max_length=32)
#     price=forms.IntegerField()

#     email=forms.EmailField()

from django.forms import widgets

class UserForm(forms.Form):
    msg={"required":"该字段不能为空"}
    user=forms.CharField(min_length=5,
                         label="用户名",
                         error_messages=msg,
                         widget=widgets.TextInput(attrs={"class":"form-control"})
                         )
    pwd=forms.CharField(error_messages=msg,
                           label="密码",
                         min_length=5,
                          widget=widgets.PasswordInput(attrs={"class":"form-control"})
                           )
    r_pwd = forms.CharField(error_messages=msg,
                            min_length=5,
                          label="确认密码",
                          widget=widgets.PasswordInput(attrs={"class": "form-control"})
                          )
    email=forms.EmailField(error_messages={"invalid":"邮箱格式错误"},
                           label="邮箱",
                           widget=widgets.EmailInput(attrs={"class":"form-control"})
                           )
///局部钩子,可以加入自己的判断逻辑
    def clean_user(self):
        val=self.cleaned_data.get("user")                         
        ret=UserInfo.objects.filter(user=val).first()
        if not ret:
            return val
        else:
            raise ValidationError("用户名已存在！")

    def clean_pwd(self):

        val=self.cleaned_data.get("pwd")
        if val.isdigit():
            raise ValidationError("密码不能是纯数字！")
        else:
            return val

///全局钩子,用来判断两次密码的一致性,确认密码
    def clean(self):

        pwd=self.cleaned_data.get("pwd")
        r_pwd=self.cleaned_data.get("r_pwd")

        if pwd and r_pwd:
            if pwd==r_pwd:
                return self.cleaned_data
            else:
                raise ValidationError("两次密码不一致！")
        else:
            return self.cleaned_data





from app01.models import UserInfo
def reg(request):
    if request.method=="POST":
        print(request.POST)

        # 数据校验
        form=UserForm(request.POST)
        if form.is_valid():
            print(form.cleaned_data)
            UserInfo.objects.create(**form.cleaned_data)    #将所有的数据字典通过**打散,创建到表中去
            return HttpResponse("OK")
        else:
            # print(form.cleaned_data)
            # print(form.errors) # {"user":["",]}
            # print(form.errors.get("user")[0]) # {"user":["",]}

            errors=form.errors   #所有的错误

            print("------>",form.errors.get("__all__"))

            if form.errors.get("__all__"):
                g_error=form.errors.get("__all__")[0]     #全局钩子的错误信息

            return render(request, "reg.html",locals())

    else:
         form=UserForm()
         return render(request,"reg.html",locals())

reg页面:可以通过forms组件进行渲染页面,不用自己创建页面

<div class="container">
    <div class="row">
        <div class="col-md-8 col-md-offset-2">
            <form action="" method="post" novalidate>
                {% csrf_token %}
                {% for field in form %}
                    <div class="form-group">
                        <label for="">{{ field.label }}</label>
                        {{ field }} <span class="error">{{ field.errors.0 }}</span>
                        {% if field.label == "确认密码" %}
                           <span class="error">{{ g_error|default:"" }}</span>
                        {% endif %}
                    </div>
                {% endfor %}
                <input type="reset">
                <input type="submit" class="btn btn-success pull-right">
            </form>
        </div>
    </div>
</div>

 modelfrom : https://www.cnblogs.com/DI-DIAO/p/8978780.htm