PHP警报消息 [英] PHP alert message

问题描述

我知道每个人都要说的第一件事是，这已经发布了几百次;然而，我已经尝试了所有不同的方法，人们建议仍然没有运气...我试图得到一个警告消息弹出如果登录失败，但由于某种原因，该消息不想出现。这是我到目前为止：

I know the first thing everyone is going to say is that this has been posted hundreds of times; however, I have tried all the different methods people have suggested with still no luck... I am trying to get an alert message to popup if the login fails but for some reason the message does not want to appear. Here's what I have so far:

if($conn) {
    $result=sqlsrv_query($conn, "SELECT * FROM Operator
    WHERE Username='{$_POST['login']}'");
    $pass=sqlsrv_fetch_array($result);
    if($pass["Password"] === $_POST['password']) {
        session_start();
        $_SESSION['loggedin']=true;
        header("Location: home.php");
        exit;
    }
    else {
        header("Location: login.php");
        echo '<script type="text/javascript">';
        echo 'alert("Password Invalid!")';
        echo '</script>';
    }
}
sqlsrv_close($conn);

php工作正常，但由于某种原因，我无法使javascript工作。任何想法？

The php is working fine but for some reason I can't get the javascript to work. Any ideas?

推荐答案

我想，问题在这里。

header("Location: login.php"); /* Redirect browser */

尝试删除它，或在几秒钟后重定向

try removing it, or make it redirect after a couple of seconds, like this

header( "refresh:5;url=login.php" ); //redirect after 5 seconds

或者提示用户单击进入下一页的对话框。移除标头（）tho

or you prompt a dialog for the user to click to go to next page. remove the header() tho

<script type="text/javascript">
<!--
   var retVal = confirm("Login FAILED! Do you want to continue ?");
   if( retVal == true ){
      window.location.href = "login.php";
      return true;
   }else{
      alert("User does not want to continue!");
      return false;
   }
//-->
</script>

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