Django的Form主要具有一下几大功能：
- 生成HTML标签
- 验证用户数据（显示错误信息）
- HTML Form提交保留上次提交数据
- 初始化页面显示内容
一,Form验证
第一种操作：主要是这三个函数
is_valid()
cleaned_data
errors
from xiaoqing import models
def form(request):
if request.method == "GET":
return render(request,‘form.html‘)
elif request.method == "POST":
obj = FM(request.POST)
r1 = obj.is_valid() #is_valid() 让这个函数去验证 返回False 或者 True
print(r1)
if r1:
print(r1)
print(obj.cleaned_data) #cleaned_data表示返回的正确的信息
# models.Host.objects.create(**obj.cleaned_data)
else:
print(obj.errors.as_json()) #errors表示错误信息
return render(request,‘form.html‘,{‘obj‘:obj,})
return redirect(‘/xiaoqing/host‘)
<form action="/xiaoqing/form/" method="post">
{% csrf_token %}
{# {% for row in error_dict.keys %}#}
<p><input type="text" placeholder="请输入用户名" name="user"/><span style="color: red">{{ obj.errors.user.0 }}</span></p>
<p><input type="password" placeholder="请输入密码" name="pwd"/><span style="color: red">{{ obj.errors.pwd.0 }}</span></p>
<p><input type="text" placeholder="请输入邮箱" name="email"/><span style="color: red">{{ obj.errors.email.0 }}</span></p>
<input type="submit" value="提交"/>
{# {% endfor %}#}
</form>
form.html
第二种操作：如果验证错误，用户信息不会消失
def form(request):
if request.method == "GET":
obj = FM() #第一次用GET请求时，需要返回客户端一个对象
return render(request,‘form.html‘,{‘obj‘:obj})
elif request.method == "POST":
obj = FM(request.POST)
r1 = obj.is_valid() #is_valid() 让这个函数去验证 返回False 或者 True
print(r1)
if r1:
print(r1)
print(obj.cleaned_data) #cleaned_data表示返回的正确的信息
# models.Host.objects.create(**obj.cleaned_data)
else:
print(obj.errors.as_json()) #errors表示错误信息
return render(request,‘form.html‘,{‘obj‘:obj,})
return redirect(‘/xiaoqing/host‘)
views.py
<form action="/xiaoqing/form/" method="post">
{% csrf_token %}
{# {% for row in error_dict.keys %}#}
<p>{{ obj.user }}<span style="color: red">{{ obj.errors.user.0 }}</span></p>
<p>{{ obj.pwd }}<span style="color: red">{{ obj.errors.pwd.0 }}</span></p>
<p>{{ obj.email }}<span style="color: red">{{ obj.errors.email.0 }}</span></p>
<input type="submit" value="提交"/>
{# {% endfor %}#}
</form>
form.html
二，Form 自定义样式
from django import forms
from django.forms import widgets # 需要import 插件widgets
from django.forms import fields #用fields 做字段验证
class FM(forms.Form):
#字段本身只做验证 它不生成input标签
user = fields.CharField(error_messages={‘required‘:‘用户名不能为空‘},
widget=widgets.Textarea(attrs={‘class‘:‘c1‘})) #用attrs 自定义样式
pwd = fields.CharField(max_length=12,
min_length=6,
error_messages={‘required‘:‘密码不能为空‘,‘min_length‘:‘密码长度不能小于6‘,‘max_length‘:‘密码长度不能大于12‘},
widget=widgets.PasswordInput)
email = fields.EmailField(error_messages={‘required‘:‘邮箱不能为空‘,‘invalid‘:‘邮箱格式错误‘})
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.c1 {
background-color: indianred;
}
</style>
</head>
<body>
<div>
{# <form action="/xiaoqing/form/" method="post">#}
{# {% csrf_token %}#}
{# {% for row in error_dict.keys %}#}
{# <p><input type="text" placeholder="请输入用户名" name="user"/><span style="color: red">{{ obj.errors.user.0 }}</span></p>#}
{# <p><input type="password" placeholder="请输入密码" name="pwd"/><span style="color: red">{{ obj.errors.pwd.0 }}</span></p>#}
{# <p><input type="text" placeholder="请输入邮箱" name="email"/><span style="color: red">{{ obj.errors.email.0 }}</span></p>#}
{# <input type="submit" value="提交"/>#}
{# {% endfor %}#}
{# </form>#}
{##}
<form action="/xiaoqing/form/" method="post">
{% csrf_token %}
{# {% for row in error_dict.keys %}#}
<p>{{ obj.user }}<span style="color: red">{{ obj.errors.user.0 }}</span></p>
<p>{{ obj.pwd }}<span style="color: red">{{ obj.errors.pwd.0 }}</span></p>
<p>{{ obj.email }}<span style="color: red">{{ obj.errors.email.0 }}</span></p>
<input type="submit" value="提交"/>
{# {% endfor %}#}
</form>
</div>
</body>
</html>
form.html
原文地址：https://www.cnblogs.com/sunhao96/p/9003554.html
时间： 2024-07-28 22:41:55