案例程序：
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>Title</title></head><body><form action="/fm/" method="POST"> ?#3个输入框分别是user/pwd/email ???{% csrf_token %} ???<input type="text" name="user" /> ???<input type="text" name="pwd" /> ???<input type="text" name="email" /> ???<input type="submit" value="提交" /></form></body></html>views函数：
from django import forms ??# 首先需导入forms包class FM(forms.Form): ????#建立一个验证类 ???user = forms.CharField(error_messages={‘required‘: ‘用户名不能为空‘}) ????#自定制的中文错误返回 ???pwd = forms.CharField( ???????max_length=‘12‘, ???????min_length=‘8‘, ???????error_messages={‘required‘: ‘密码不能为空‘, ‘max_length‘: ‘密码最大长度不能大于12‘, ‘min_length‘: ‘密码最小长度不能小于8‘} ???) ???email = forms.EmailField(error_messages={‘required‘: ‘邮箱不能为空‘, ‘invalid‘: ‘邮箱格式错误‘})def fm(request): ???if request.method == "GET": ???????return render(request, ‘fm.html‘) ???elif request.method == "POST": ???????# 获取用户的所有数据 ???????# 每条数据请求的验证 ???????# 成功：获取所有的正确信息 ???????# 失败：显示错误信息 ???????obj = FM(request.POST) #生成一个表单验证类 ???????r1 = obj.is_valid() ???#验证输出的结果 成功为true ?错误为false ???????print(r1) ???????if r1: ???????????print(obj.cleaned_data) ?#如果成功返回验证好的数据并打印 ???????else: ???????????print(obj.errors.as_json) ?#如果失败返回错误信息打印 ???????return redirect(‘/fm/‘)显示的信息：
达到了自定制返回的错误信息为中文的目的
向前端送出验证错误信息：
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>Title</title></head><body><form action="/fm/" method="POST"> ???<p><input type="text" name="user" /> ?{{ obj.errors.user.0 }} </p> ?#前端显示验证错误信息 ???<p><input type="text" name="pwd" /> {{ obj.errors.pwd.0 }} </p> ???<p><input type="text" name="email" /> {{ obj.errors.email.0 }} </p> ???<input type="submit" value="提交" /></form></body></html>def fm(request): ???if request.method == "GET": ???????obj = FM() ???????return render(request, ‘fm.html‘, {‘obj‘: obj}) # 传送一个验证数据对象obj ???elif request.method == "POST": ???????# 获取用户的所有数据 ???????# 每条数据请求的验证 ???????# 成功：获取所有的正确信息 ???????# 失败：显示错误信息 ???????obj = FM(request.POST) ???????r1 = obj.is_valid() ???????print(r1) ???????if r1: ???????????print(obj.cleaned_data) ???????else: ???????????print(obj.errors) ???????????return render(request, ‘fm.html‘, {‘obj‘: obj}) ???return render(request, ‘fm.html‘)Django-website 程序案例系列-16 ?modle.form(表单验证)
原文地址：https://www.cnblogs.com/kuku0223/p/8119362.html