Django ---Form的字段、选择下拉框 adiocheckbox

Django Form组件
1 验证
2 生成HTML(保留上次输入内容)
3 初始化默认值

FORM重点
-字段
　　ChoiceField 单选框
　　MultipleChoiceField 多选框
　　CharField
　　IntegerField
　　DecimalField 小数　　
　　DateField
　　DateTimeField
　　EmailField
　　GenericIPAddressField IP

　　RegexField 自定义正则

-HTML插件

　　通过attrs(class="jj") 给字段添加属性

自定义字段时的views文件

from django.shortcuts import render

from django import forms
from django.forms import fields
from django.forms import widgets

class TestForm(forms.Form):
    user = fields.CharField(
        required=False,
        max_length=12,
        min_length=3,
        error_messages={"required":'不能为空'},


            )
    age = fields.IntegerField()
    email = fields.EmailField()

    city =fields.ChoiceField(
        choices=[(1,"北京"),(2,"上海"),(3,"广州"),], #单选下拉框
        initial=2
    )

    gender =fields.CharField(
        widget=widgets.Select(choices=[(1,"男"),(2,"女"),]),     #单选下拉框  选男不选女
        initial=2
    )

    hobby=fields.CharField(
        widget=widgets.RadioSelect(choices=[(1,"男"),(2,"女"),]),   #单选radio
        initial = 2,
    )

    province=fields.MultipleChoiceField(
        choices=[(1,'安徽'),(2,'江苏'),(3,'广东')],    #d多选下拉框
        initial=[1,2]
    )

    cc=fields.CharField(
        widget=widgets.CheckboxInput(),    #单选checkbox
    )

    dd=fields.MultipleChoiceField(    #多选 checkbox
        initial=[2,],
        choices=((1,'a'),(2,'b'),(3,"c")),
        widget=widgets.CheckboxSelectMultiple
    )

def test(request):
    if request.method == "GET":
        obj=TestForm()
        render(request,'test.html',{"obj":obj})

    if request.method == 'POST':
        obj =TestForm(request.POST)

    return render(request,'test.html',{'obj':obj})

对应的HTML文件

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="" method="post" novalidate>
    {% csrf_token %}
    <p>{{ obj.user.label }}   {{ obj.user }}</p>
    <p>{{ obj.age.label }}   {{ obj.age }}</p>
    <p>{{ obj.email.label }}   {{ obj.email }}</p>
    <p>{{ obj.city.label }}   {{ obj.city }}</p>
    <p>{{ obj.gender.label }}   {{ obj.gender }}</p>
    <p>{{ obj.hobby.label }}   {{ obj.hobby.0 }}{{ obj.hobby.1 }}</p>
    <p>{{ obj.province.label }}   {{ obj.province }}</p>
    <p>{{ obj.cc.label }}   {{ obj.cc }}</p>
    <p>{{ obj.dd.label }}    {{ obj.dd }}</p>
    <p>{{ obj.dd.label }}
        {% for row in obj.dd %}
            {{ row }}{{ '&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp' }}
        {% endfor %}
    </p>


    <input type="submit" value="提交">
</form>





</body>
</html>

对应的效果

----------------------------------------------------------------------

用单选下拉框是，下拉框内的内容需要从数据库中取，

如果直接去，浏览器会将数据库的内容加载然后存到内存。后期数据库更新时，浏览器也不会更新的，所以需要添加__int__()属性

from app01 import models
class LoveForm(forms.Form):
    
　　 price = fields.IntegerField()
    user_id = fields.IntegerField(
        # widget=widgets.Select(choices=[(0,'alex'),(1,'杨建'),(2,'刘昊辰')])
        widget = widgets.Select()
    )

    def __init__(self,*args,**kwargs):   #实时根据数据库更新，每次运行时，都会执行__int__（）,得到choices
        super(LoveForm, self).__init__(*args,**kwargs)
        self.fields['user_id'].widget.choices=models.UserInFo.objects.values_list('id','username')

def love(request):
    obj=LoveForm()
    return render(request,'love.html',{'obj':obj})