一、Form组件初识

• 引用类from django import forms
• 继承forms.Form
• 继承后里面的变量名和html标签name属性，一一对应关系

class FM(forms.Form):
    user = forms.CharField()
    pwd = forms.CharField()
    email = forms.EmailField()

• view中方法使用,创建对象obj = FM(request.POST),判断是否为真Valid = obj.is_valid(),获取对象全部内容obj.cleaned_data,获取展示页面的提示信息obj.errors

def login(request):
    if request.method == "GET":
        return render(request,"login.html")
    elif request.method == "POST":
        obj = FM(request.POST)
        Valid = obj.is_valid()
        if Valid:
            print(obj.cleaned_data)
        else:
            #print(obj.errors.as_json)
            erro_msg = obj.errors
            return render(request,'login.html',{"erro":erro_msg})

• 其中obj.errors.as_json打印的格式为

<bound method ErrorDict.as_json of {'pwd': ['密码不能为空'], 'email': ['邮箱不能为空'], 'user': ['用户名不能为空']}>

• 如何让默认提示变成英文
• error_messages 错误信息的属性
• required是否为空
• max_length 最长
• min_length 最短
• invalid 格式

    user = forms.CharField(error_messages={'required':'用户名不能为空'})
    pwd = forms.CharField(
        max_length=12,
        min_length=6,
        error_messages={'required':'密码不能为空','max_length':'密码长度小于12','min_length':'密码长度大于6'}
    )
    email = forms.EmailField(error_messages={'required':'邮箱不能为空','invalid' :'邮箱格式不对'})

view 层的代码

<form action="/login/" method="post">
        {% csrf_token %}
        <p><input name="user" type="text">{{ erro.user.0 }}</p>
        <p><input name="pwd" type="password">{{ erro.pwd.0 }}</p>
        <p><input name="email" type="text">{{ erro.email.0 }}</p>
        <input type="submit">

二、Form组件升级

from django.shortcuts import render,redirect
from django import forms
# Create your views here.
class FM(forms.Form):
    user = forms.CharField(error_messages={'required':'用户名不能为空'})
    pwd = forms.CharField(
        max_length=12,
        min_length=6,
        error_messages={'required':'密码不能为空','max_length':'密码长度小于12','min_length':'密码长度大于6'}
    )
    email = forms.EmailField(error_messages={'required':'邮箱不能为空','invalid' :'邮箱格式不对'})
def login(request):
    if request.method == "GET":
        obj = FM()
        return render(request,"login.html",{"obj":obj})
    elif request.method == "POST":
        obj = FM(request.POST)
        Valid = obj.is_valid()
        if Valid:
            print(obj.cleaned_data)
        else:
            return render(request,'login.html',{"obj":obj})

html

<form action="/login/" method="post">
        {% csrf_token %}
        <p>{{ obj.user }}{{ obj.erros.user.0 }}</p>
        <p>{{ obj.pwd }}{{ obj.erros.pwd.0 }}</p>
        <p>{{ obj.email }}{{ obj.erros.email.0 }}</p>
        <input type="submit">
    </form>

其中在html页面中ul展示{{obj.as_ul}},p标签展示{{obj.as_p}}
table展示

<table>
        {{obj.as_table}
</table>