<?php

session_start();

include_once "connect.php";

$fullName = $_POST['fullname'];
$userName = $_POST['username'];
$emailAdd = $_POST['email'];
$passWord = $_POST['password'];
$query =  mysql_query("SELECT * FROM users where USERNAME = '$username' ");
$result = mysql_fetch_array($query);

  if($fullName == "")
  {

?>
    <script>
      alert("Full Name is required!");
      window.location.href = "registeruser.php";
    </script>
<?php
  }

    else
    {
      if ($userName == "")
      {
?>
        <script>
          alert("Invalid username!");
          window.location.href = "registeruser.php";
        </script>
 <?php     
      }

        else
        {
          if($userName == $result['USERNAME'])
          {
?>
            <script>
              alert("Username already exists!");
              window.location.href = "registeruser.php";
            </script>
<?php
          }

            else
            {
              if ($emailAdd == $result['EMAIL']) 
              {
?>
                <script>
                  alert("Email address is required!");
                  window.location.href = "registeruser.php";
                </script>
<?php
              }

                else
                {
                  if ($passWord == "")
                  {
?>
                    <script>
                      alert("Username is required!");
                      window.location.href = "registeruser.php";
                    </script>
 <?php     
                  }

                    else
                    {
                      if($_POST['password']==$_POST['confirmpass'])
                      {
                        mysql_query("INSERT INTO users (FULLNAME, USERNAME, EMAIL, PASSWORD) 
                        VALUES ('$fullName', '$userName', '$emailAdd', '$passWord')" );
                        mysql_close();
?>    
                        <script>
                          alert("Registered Successfully!");
                          window.location.href = "index.php";
                        </script>
<?php
                      }

                        else
                        {
?>
                          <script>
                            alert("Password and Confirm Password do not match");
                            window.location.href = "registeruser.php";
                          </script>
<?php
                        }
                    }
                }
            }
        }
    }   

?>

它工作正常。但问题是:警报窗口显示到另一个网页，而不是在网页内 没关系，但是将用户引导到另一个没有内容的网页看起来很糟糕。如果您能帮助我，请告诉我如何解决此问题并使 javascript 警报窗口仅显示在同一网页上。实际上，我已经尝试过一些这样的解决方案..

if($fullName == "")
{
  echo '<script>';
  echo 'alert("Full Name is required!")';
  echo 'window.location.href = "registeruser.php"';
  echo '</script>';
}

最佳答案

您好，您尝试将 ajax 与 jquery 结合使用吗

现在你的脚本只是返回一个 json 对象来说明是否一切正常 //reg.php

session_start();
header('Content-type: application/json');

include_once "connect.php";

// result we return to the user
$response = ['error' => false, 'message' => ''];

$fullName = $_POST['fullname'];
$userName = $_POST['username'];
$emailAdd = $_POST['email'];
$passWord = $_POST['password'];
$query =  mysql_query("SELECT * FROM users where USERNAME = '$username' ");
$result = mysql_fetch_array($query);

if($fullName == "") {
    $response['message'] = 'Full Name is required!';
    $response['error'] = true;
} else {
    if ($userName == "") {
        $response['message'] = 'Invalid username!';
        $response['error'] = true; 
    } else {
        if($userName == $result['USERNAME']) {
            $response['message'] = 'Username already exists!';
            $response['error'] = true;
        } else {
            if ($emailAdd == $result['EMAIL'])  {
                $response['message'] = 'Email address is required!';
                $response['error'] = true;
            } else {
                if ($passWord == "") {
                    $response['message'] = 'Username is required!';
                    $response['error'] = true;
                } else {
                    if($_POST['password']==$_POST['confirmpass']) {
                        mysql_query("INSERT INTO users (FULLNAME, USERNAME, EMAIL, PASSWORD)  VALUES ('$fullName', '$userName', '$emailAdd', '$passWord')" );
                        mysql_close();
                        $response['message'] = 'OK';
                        $response['error'] = false;
                    } else {
                        $response['message'] = 'Password and Confirm Password do not match';
                        $response['error'] = true;
                    }
                }
            }
        }
    }
}

die(json_encode($response));

和 //注册.php

<form method=POST action="reg.php" id="myForm">
<!--input goes here-->
</form>

<script src="//path to jquery"></script>

<script>

$(document).ready(() => {

    $('#myForm').on('submit', function (e) {
        e.preventDefault();

        $.post('reg.php', $(this).serialize())
            .done((datas) => {


                if(datas.erreur) {
                    alert(datas.message);
                } else {
                    alert('registration succesfully');
                }
            }).fail(() => {
                alert('connect error !!!');
            });
    });

});
</script>

关于Javascript 警报窗口重定向到另一个网页，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31398576/