Question

我需要一些帮助。当我第一次加载我的网页时，MainPage中的输入错误会一直显示在我的网页中。我如何解决它，所以当我加载页面时，它确实显示任何输入错误？

错误应仅在用户未输入任何文本并单击“共享评论”按钮或用户仅为文本放置空格并单击按钮时显示。

这是我的代码和HTML：

代码：

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

import os
import time

import jinja2
import webapp2


template_dir = os.path.join(os.path.dirname(__file__), 'templates')

jinja_environment = jinja2.Environment(
    loader = jinja2.FileSystemLoader(template_dir),
    extensions=['jinja2.ext.autoescape'],
    autoescape=True)

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

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

class Handler(webapp2.RequestHandler):
    def write(self, *a, **kw):
        self.response.out.write(*a, **kw)


class PostComments(Handler):
    def post(self):
        comment = Comment()

        if users.get_current_user():
            comment.author = Author(
                identity=users.get_current_user().user_id(),
                name=users.get_current_user().nickname(),
                email=users.get_current_user().email())

        comment.content = self.request.get('comment')
        delay = 1

        if comment.content == '':
            self.redirect('/error#comments')

        elif comment.content.isspace() == True: #checks for whitespace
            self.redirect('/error#comments')

        else:
            comment.put()

            time.sleep(delay)
            self.redirect('/#comments')


class MainPage(Handler):
    def get(self):
        query_result = 25
        comments_query = Comment.query().order(-Comment.timestamp)
        comments, cursor, more = comments_query.fetch_page(query_result)
        user = users.get_current_user()

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

        template_values = {
            'user': user,
            'comments': comments,
            'url': url,
            'url_linktext': url_linktext,
            'blank_comment_error': 'Please write a valid comment & resubmit. Thank you!',
        }

        template = jinja_environment.get_template('page_body.html')
        self.write(template.render(template_values))


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

我的HTML的一部分：

<div class="title">
    <h2>User Comments</h2>
</div>
<br>
<a name="comments"></a>
<div class="comments">
<form action="/sign" method="post">
<div>
<label for="comment">Add a Comment Please!</label>
<a class="linktext" href="{{ url|safe }}">{{ url_linktext }}</a>
</div>
<div class="error"><p>{{ blank_comment_error }}</p>
</div>
<div><p class="img"><textarea name="comment" rows="5" cols="80"></textarea></p>
</div>
<div><input type="submit" value="Share Comment">
</div>
</form>
<br>
<div class="comments">
{% for comment in comments %}
    {% if comment.author %}
    <b>{{ comment.author.email }}
        {% if user %}
            (You)
        {% endif %}
    </b> wrote on {{ comment.timestamp.strftime("%m/%d/%Y at %H:%M UTC") }}:
    {% else %}
    <em>Anonymous</em> Wrote on {{ comment.timestamp.strftime("%m/%d/%Y at %H:%M UTC") }}:
    {% endif %}
   <div class="comment"><blockquote>{{ comment.content }}</blockquote></div>
{% endfor %}
</div>
</div>

Answer 1

您总是会看到错误，因为get()始终设置错误。

def get(self):
    ...
    template_values = {
        ...
        'blank_comment_error': 'Always seen',
        ...
    }
    ...
    self.write(template.render(template_values))

看起来你试图通过添加#comments来表示存在错误，但主/错误页面的处理程序中没有任何内容检查它。

我的错误处理程序在加载时始终显示在我的网页中

1 个答案: