字段的属性梳理
最重要的字段
required
inital
widget
error_messages
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required：是否允许为空
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widget：指定插件
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lable：设置一个label标签，我们之前会在input标签之前写一个label标签，这个label标签有一个for的属性，指向后面的input标签，只要点击一下lable标签的内容，则鼠标会自动跳转到input标签中
form表单的代码
user4 = forms.CharField(required=True,label="用户名",widget=widgets.TextInput(attrs={"placeholder":"密码"}))
前端的代码，第一个lable标签实现的效果就和obj.user4.label_tag的效果一样，会生成一个lable标签，有for的属性
<p>
<label for="{{ obj.user4.id_for_label }}">{{ obj.user4.label }}</label>
{{ obj.user4.label_tag }}
{{ obj.user4 }}
</p>
html的代码
浏览器的效果
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initail：初始值
user4 = forms.CharField(required=True,initial="老鼠",label="用户名",widget=widgets.TextInput(attrs={"placeholder":"密码"}))
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help_text生成一个帮助信息
user4 = forms.CharField(required=True,initial="老鼠",label="用户名",widget=widgets.TextInput(attrs={"placeholder":"密码"}),help_text="aaaa")
<p>
<label for="{{ obj.user4.id_for_label }}">{{ obj.user4.label }}</label>
{{ obj.user4.label_tag }}
{{ obj.user4 }}
{{ obj.user4.help_text }}
</p>
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show_hidden_initail：是否生成一个有默认值的隐藏的标签，主要的实际用户就是判断客户当前的输入和默认值是否一样
user4 = forms.CharField(required=True,
initial="老鼠",
label="用户名",
widget=widgets.TextInput(attrs={"placeholder":"密码"}),
help_text="aaaa",
show_hidden_initial=True)
html代码不需要做任何修改
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自定义匹配规则
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disable：标签是否允许编辑
user4 = forms.CharField(required=True,
initial="老鼠",
label="用户名",
widget=widgets.TextInput(attrs={"placeholder":"密码"}),
help_text="aaaa",
show_hidden_initial=True,
disabled=True)
前端页面
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localize:本地化，暂时不涉及
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label_suffix设置lable标签和input标签之间的字符，默认是用冒号，通过label_suffix可以替换冒号，设置成我们想要的符号
user4 = forms.CharField(required=True,
initial="老鼠",
label="用户名",
widget=widgets.TextInput(attrs={"placeholder":"密码"}),
help_text="aaaa",
show_hidden_initial=True,
disabled=True,
label_suffix="---->")
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error_messages:设置不同的错误码对应不同的报错
u_name = forms.CharField(min_length=6,max_length=12,error_messages={"required":"用户名不能为空",
"min_length":"最小长度为6",
"max_length":"最大长度为12"
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max_length：最大长度
min_length：最小长度
min_value：最小值
max_value：最大值
可以根据上面4个在error_messages中当做错误码
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srtip=true:是否移除空白
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日期格式
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choice:默认是select框
user5 = forms.ChoiceField(
initial=1,
choices=[(1,"找死"),(2,"刘能"),(3,"六大脑袋")]
)
且默认选中第一个，前台选中，后台拿到的字符串
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如果想要实现字符类型的转换可以有下面两种方法
这个只能转换为数字
user7 = forms.IntegerField(
initial=1,
choices=[(1, "找死"), (2, "刘能"), (3, "六大脑袋")]
)
这个可以根据函数自定义转换后的类型，这里这个x就是select框中选中的1，或者2，或者3
user6 = forms.TypedChoiceField(
coerce=lambda x:int(x),
initial=1,
choices=[(1, "找死"), (2, "刘能"), (3, "六大脑袋")]
)
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