PHP脚本返回"undefined"(未定义)提交时 [英] PHP script returning "undefined" on submit

问题描述

我正在构建一个小型应用程序，该应用程序基本上是用HTML和jQuery mobile构建的表单，已经将其部署到了Web上以及应用程序的iOS版本中，它的工作原理很吸引人.但是现在，当尝试在应用程序的android版本上进行部署时，提交时我只是在屏幕上看到"undefined"，没有"undefined variable"或其他任何东西，而仅仅是"undefined".

I'm building a small app, which is basicly a form built in HTML and jQuery mobile, I've deployed it to the web, and to my iOS-version of the app, and it works like a charm. But now when trying to deploy on the android-version of the app, I just get "undefined" on the screen when submiting, no "undefined variable" or anything else, just "undefined".

有人对此问题有某种解决方案吗?我正在使用PhoneGap部署HTML/CSS/JQuery

Do anyone have some form of solution to this problem? I'm using PhoneGap to deploy HTML/CSS/JQuery

我非常感谢您提供的任何帮助.

I'm very grateful for any help given.

我在这里发布代码:

<?php


$con = mysql_connect("db-ip","username","password");
if (!$con)
  {
  die('errormessage: ' . mysql_error());
  }

mysql_select_db("dbname", $con);

$myusername=$_POST['username'];
$myusername = stripslashes($myusername);
$myusername = mysql_real_escape_string($myusername);
$sql2="SELECT * FROM users WHERE username='$myusername'";
$result=mysql_query($sql2);
$count=mysql_num_rows($result);

if (empty($myusername))
    {
        header('Location:error2.html');
        exit;   
    }

if($count==1)
    {
        $sql="INSERT INTO testresult(slider1, slider2, slider3, slider4, time, user) VALUES('$_POST[slider1]', '$_POST[slider2]', '$_POST[slider3]', '$_POST[slider4]', NOW(),'$myusername')";
    }
else    
    {
        header('Location:error.html');
        exit;
    }

if (!mysql_query($sql,$con))
  {
  die('errormessage:' . mysql_error());
  }

header('Location:done.html');
exit;

mysql_close($con);


?>

推荐答案

如果错误只是undefined，则不能由PHP引起.在JavaScript中，undefined表示未定义您要使用的变量.

If the error is just undefined, it can't be caused by PHP. In JavaScript, undefined means that the variable which you are trying to use isn't defined.

另一个观察结果是mysql_函数.您应该考虑改用PDO.

Another observation was mysql_ functions. You should consider using PDO instead.

从php.net:

不鼓励使用此扩展名.相反，应使用MySQLi或PDO_MySQL扩展.另请参见MySQL:选择API指南和相关的FAQ，以获取更多信息.此功能的替代方法包括:

Use of this extension is discouraged. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include:

这是关于以mysql_开头的函数的.

And this was about functions starting with mysql_.

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