Question

我使用Cherrypy Postgresql从头开始创建自己的网站。我是Python和Javascript的beginner但我对学习这两种编程语言非常热心。

我现在要做的是fill up HTML form - ＆gt; Send data using JSON by AJAX - ＆gt; Define Rights for a visitor - ＆gt;完成所有工作后redirect to index。

我正在与这个错误斗争好几天因为我无法在互联网上找到一个例子如何使用JSON通过AJAX在python中发送数据

正如我所说我是初学者，所以我要编写代码中的所有不良行为，请：）

Traceback (most recent call last):
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\cherrypy\_cpdispatch.py", line 60, in __call__
    return self.callable(*self.args, **self.kwargs)
TypeError: login() missing 1 required positional argument: 'dataString'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\cherrypy\_cprequest.py", line 670, in respond
    response.body = self.handler()
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\cherrypy\lib\encoding.py", line 221, in __call__
    self.body = self.oldhandler(*args, **kwargs)
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\cherrypy\_cpdispatch.py", line 66, in __call__
    raise sys.exc_info()[1]
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\cherrypy\_cpdispatch.py", line 64, in __call__
    test_callable_spec(self.callable, self.args, self.kwargs)
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\cherrypy\_cpdispatch.py", line 163, in test_callable_spec
    raise cherrypy.HTTPError(404, message=message)
cherrypy._cperror.HTTPError: (404, 'Missing parameters: dataString')

Cherrypy引擎打印输出

[12/Jun/2017:13:44:03]  Testing database is disabled, deleting test users... skipping...
[12/Jun/2017:13:44:03]  ====== INIT SQL ======
[12/Jun/2017:13:44:03]  Connecting to PostgreSQL database...
[12/Jun/2017:13:44:03]  Testing engine is enabled, adding record...
[12/Jun/2017:13:44:03]  ====== INIT SRV ======
[12/Jun/2017:13:44:03] ENGINE Bus STARTING
CherryPy Checker:
The Application mounted at '' has an empty config.

[12/Jun/2017:13:44:03] ENGINE Started monitor thread 'Autoreloader'.
[12/Jun/2017:13:44:03] ENGINE Started monitor thread '_TimeoutMonitor'.
C:\Program Files (x86)\Python36-32\lib\site-packages\cherrypy\process\servers.py:411: UserWarning: Unable to verify that the server is bound on 8080
  warnings.warn(msg)
[12/Jun/2017:13:44:08] ENGINE Serving on http://0.0.0.0:8080
[12/Jun/2017:13:44:08] ENGINE Bus STARTED

Python登录方法

class Root(object):
    exposed = True

    @cherrypy.expose
    # @cherrypy.tools.json_out()
    @cherrypy.tools.json_in()
    @cherrypy.tools.accept(media='application/json')
    def login(self, dataString):
        # cherrypy.request.method == "POST":
        self.addHeader()
        db = config()
        conn = psycopg2.connect(**db)
        cur = conn.cursor()
        is_logged_in = None
        bad_username = None
        bad_password = None
        json.load(dataString)
        # input_json = cherrypy.request.json()
        # dataString = input_json["dataString"]
        # - Login
        username_input = dataString[0]
        if username_input == cur.execute("SELECT username FROM users WHERE username = %s;", (username_input)):
            username_password = dataString[1]
            if username_password == cur.execute("SELECT password FROM users WHERE password = %s;", (username_password)):
                return is_logged_in
            else:
                return bad_password
        else:
            return bad_username

    @cherrypy.expose
    def index(self):
        self.addHeader()
        return "ok"

Javascript .js覆盖提交功能

$("#myForm").submit(function(){
    var dataString = [];
    dataString.login = $("#login").val();
    dataString.password = $("#password").val();

    $.ajax({
      type: 'POST',
      url: 'http://0.0.0.0:8080/login',
      data: JSON.stringify(dataString),
      contentType: 'application/json',
      dataType: 'json',
      success: function(response) {
          console.log(response);
      },
      error: function(response) {
          console.log(response);
      }
    });
});

HTML文件

<!DOCTYPE html>
<html>
  <head>
    <link href="style.css" rel="stylesheet">
    <script src="http://code.jquery.com/jquery-2.0.3.min.js"></script>
    <script src="example.js"></script>
  </head>
<body>
<div class="login-page">
  <div class="form">
      <form action="/process_form/" method="post">
      <!-- id="myForm" class="login-form"> -->
        <input type="text" name="login" id="login" placeholder="login"/>
        <input type="password" name="password" id="password" placeholder="password"/>
        <button form="myForm" type="submit">Login</button>
        <p class="message">Not registered? <a href="#">Create an account</a></p>
      </form>
  </div>
</div>
</body>
</html>

Answer 1

您在login函数中收到的AJAX数据不包含在参数dataString中（实际上，您不会获得任何参数），但在cherrypy.request.json中。

因此，您应该按如下方式更改登录功能：

@cherrypy.expose
@cherrypy.tools.json_in()
def login(self):
    json_obj = cherrypy.request.json
    ...

请注意，您将收到基于AJAX参数的实际对象（dict / list），而不是字符串。

另一个注意事项：cherrypy.request.json只有在您设置了装饰器@cherrypy.tools.json_in()时才会被填充（正如您已经做过的那样）。

Cherrypy - 重现JSON数据404，＆＃39;缺少参数＆＃39;

Cherrypy引擎打印输出

Python登录方法

Javascript .js覆盖提交功能

HTML文件

1 个答案: