Question

Hey Guys我正在一个网站上工作，我已经在我的网站上添加了一个留言簿，它正在google appspot上运行并运行，但是有一个问题。它允许人们提交空白内容。我需要一个代码来告诉用户此提交无效。我将分享我的代码，任何帮助将不胜感激。这是我的第一次编码体验和我的第一个网站。我放了一个if语句，但它不起作用。谢谢你帮帮我们。

import os
import urllib
import jinja2
import webapp2


from google.appengine.api import users
from google.appengine.ext import ndb



JINJA_ENVIRONMENT = jinja2.Environment(
loader=jinja2.FileSystemLoader(os.path.dirname(__file__)),
extensions=['jinja2.ext.autoescape'],
autoescape=True)

DEFAULT_GUESTBOOK_NAME = 'default_guestbook'


def guestbook_key(guestbook_name=DEFAULT_GUESTBOOK_NAME):
    return ndb.Key('Guestbook', guestbook_name)


class Author(ndb.Model): 
    identity = ndb.StringProperty(indexed=False)
    email = ndb.StringProperty(indexed=False)


class Greeting(ndb.Model):
    author = ndb.StructuredProperty(Author)
    content = ndb.StringProperty(indexed=False)
    date = ndb.DateTimeProperty(auto_now_add=True)



class MainPage(webapp2.RequestHandler):
   def get(self):
        guestbook_name = self.request.get('guestbook_name',
                                          DEFAULT_GUESTBOOK_NAME)
        greetings_query = Greeting.query(
            ancestor=guestbook_key(guestbook_name)).order(-Greeting.date)
        greetings = greetings_query.fetch(10)

        user = users.get_current_user()
        if user:
            url = users.create_logout_url(self.request.uri)
            url_linktext = 'Logout'
        else:
            url = users.create_login_url(self.request.uri)
            url_linktext = 'Login'

        template_values = {
            'user': user,
            'greetings': greetings,
            'guestbook_name': urllib.quote_plus(guestbook_name),
            'url': url,
            'url_linktext': url_linktext,
        }

        template = JINJA_ENVIRONMENT.get_template('index.html')
        self.response.write(template.render(template_values))

class Guestbook(webapp2.RequestHandler):
    def post(self):
        guestbook_name = self.request.get('guestbook_name',
                                          DEFAULT_GUESTBOOK_NAME)
        greeting = Greeting(parent=guestbook_key(guestbook_name))

        if users.get_current_user():
            greeting.author = Author(
                    identity=users.get_current_user().user_id(),
                    email=users.get_current_user().email())

        greeting.content = self.request.get('content')
        greeting.put()
        greeting.content = self.request.get('content')

        if greeting:
            greeting.put()
            self.redirect('/')
        else:
            self.redirect('/?error=That seems invalid to me.')

        query_params = {'guestbook_name': guestbook_name}
        self.redirect('/?' + urllib.urlencode(query_params))


app = webapp2.WSGIApplication([('/', MainPage), ('/sign', Guestbook), ], debug=True)

Answer 1

你必须检查内容是否为空。

相反，您正在检查问候对象是否存在。如下条件如下

if users.get_current_user():
    greeting.author = Author(
            identity=users.get_current_user().user_id(),
            email=users.get_current_user().email())

    greeting.content = self.request.get('content')

    if len(greeting.content > 0):
        greeting.put()
        self.redirect('/')
    else:
        self.redirect('/?error=That seems invalid to me.')

    query_params = {'guestbook_name': guestbook_name}
    self.redirect('/?' + urllib.urlencode(query_params))

Answer 2

您应该检查内容是否空虚，而不是greeting本身，并在将可能空的问候语放入存储空间之前执行此操作：


content = self.request.get('content')
if content:
    greeting.content = content
    greeting.put()
    self.redirect('/')
else:
    self.redirect('/?error=That seems invalid to me.')

或进行页面javascript检查，如here所述，或使用某些lib，如validate.js

我需要一个代码在我的留言簿上做空白验证

2 个答案: