如何在python web.py中使用单选按钮

Question

我正在使用web.py框架来创建一个简单的Web应用程序

我想创建一个单选按钮，所以我写了下面的代码

from web import form
from web.contrib.auth import DBAuth
import MySQLdb as mdb



render = web.template.render('templates/')

urls = (
  '/project_details',  'Project_Details',  
)

class Project_Details:

    project_details = form.Form( 
        form.Radio('Home Page'),
        form.Radio('Content'),
        form.Radio('Contact Us'),
        form.Radio('Sitemap'),
        )

    def GET(self):
        project_details = self.project_details()
        return render.projectdetails(project_details)  

当我用url localhost:8080运行代码时，我看到以下错误

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/web/application.py", line 237, in process
    return p(lambda: process(processors))
  File "/usr/lib/python2.7/site-packages/web/application.py", line 565, in processor
    h()
  File "/usr/lib/python2.7/site-packages/web/application.py", line 661, in __call__
    self.check(mod)
  File "/usr/lib/python2.7/site-packages/web/application.py", line 680, in check
    reload(mod)
  File "/home/local/user/python_webcode/index.py", line 68, in <module>
    class Project_Details:
  File "/home/local/user/python_webcode/index.py", line 72, in Project_Details
    form.Radio('password'),
TypeError: __init__() takes at least 3 arguments (2 given)

需要在单选按钮中传递什么参数以避免此错误

Answer 1

看看source，看起来你必须为你的所有物品使用一个Radio构造函数，因为相同的Radio对象实际上会生成多个<input>元素。

试试像::

project_details = form.Form( 
    form.Radio('details', ['Home Page', 'Content', 'Contact Us', 'Sitemap']),
    )

Answer 2

这就是我能够破译的内容。 checked ='checked'似乎在列表中选择一个随机（最后？）项。没有默认选择，如果没有选择任何单选按钮，我的测试将返回NoneType。

project_details = form.Form(
  form.Radio('selections', ['Home Page', 'Content', 'Contact Us','Sitemap'], checked='checked'),
  form.Button("Submit") 
)

要以字符串形式访问您的用户选择...

result = project_details['selections'].value

如果您想在模板处于活动状态时使用javascript，可以将onchange ='myFunction（）'添加到Radio line-item的末尾。我也为每个元素分配一个id，以避免对我的getElementById调用感到沮丧，所以我的声明看起来像这样。

 project_details = form.Form(
   form.Radio('selections', ['Home Page', 'Content', 'Contact Us','Sitemap'], checked='checked', onchange='myFunction()', id='selections'),
   form.Button("Submit") 
)