显示和隐藏php更新和删除消息 - show and hide php update and delete messages?

只有当我按下提交按钮时，我才能显示更新消息和删除消息，因为每次打开页面或重新加载页面时，你都可以看到消息栏，而无需按下提交按钮

<?php require_once("header.php");  ?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" dir="RTL" lang="Ar">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

<link href="css/style.css" media="screen" rel="stylesheet" type="text/css" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body> 

<?php
if(isset($_GET['language_id']) && is_numeric($_GET['language_id']) && $_GET['language_id'] > 0 ){
$language_id = $_GET['language_id'];
}
?>
<?php include ("connection.php"); ?>
<?php
   $msg = "";
   if (isset($_POST['update'])) {
       if(is_numeric($_POST['language_id'])){
          $language_id = mysqli_real_escape_string($link,htmlspecialchars($_POST['language_id']));
          $language_name = mysqli_real_escape_string($link,htmlspecialchars($_POST['language_name']));

            if ($language_name == "")
            {
                $msg = "يرجى تعبيئة كافة الحقول" ;
            }
            else 
            {                   
                $sql = mysqli_query ($link,"UPDATE `programming_language` SET `language_name`='".$language_name."' 
                    WHERE `language_id`='".$language_id."' "); 
                    if($sql){
                         $msg = "تمت عملية التعديل بنجاح";
                        // header ("location:edit_programming_language.php");   
                    }                 

            }
        }
        else
        {
            echo "Error !";
        }
    }
    else
    {   
        if(isset($_GET['language_id']) && is_numeric($_GET['language_id']) && $_GET['language_id'] > 0 ){
                 $language_id = $_GET['language_id'];
            $query = mysqli_query($link,"SELECT * FROM `programming_language` WHERE `language_id` ='".$language_id."' ")  or die(mysqli_error($link));  
            while( $row = mysqli_fetch_assoc ($query) ){
              $language_id = $row ['language_id'];
              $language_name = $row['language_name'];

            }
        }   
    }
?>
<div class="page-container">
 <div  class="alert  alert-success">
    <button type="button" class="close" >
                &times;
            </button>
 <p><?php    echo $msg;        ?></p>
 </div> 
<div class="edit-programming-language">
<form method= "POST" action = "" > 


                        <input type="hidden" name = "language_id" value="<?php echo $language_id ;?>" />
  <p>                     
                        <label>اسم اللغة</label>
                        <td><input type="text" name = "language_name" value="<?php echo $language_name ;?>" /></td>
       </p>
  <p>      
                        <td><input type="submit" name = "update" class="button  edit-programming-language-btn" value="تحديث البيانات"  /></td>
  </p>   
                        <input type="hidden" name = "examinee_id" value="<?php echo $_GET['language_id']; ?>" />

              </form>




</div>
</div>
</body>
</html>

我的警报的css代码

.alert {
    padding: 15px;
    margin-bottom: 20px;
    height:25px;
    border: 1px solid transparent;
    -moz-border-radius: 4px;
    -webkit-border-radius: 4px;
    border-radius: 4px;
    display: block;
}
.alert-success {
    color: #3c763d;
    background-color: #dff0d8;
    border-color: #d6e9c6;
    border-top-color: #c9e2b3;
}
.alert-danger {
    color: #a94442;
    background-color: #f2dede;
    border-color: #ebccd1;
    border-top-color: #e4b9c0;
}
.alert  p {
    text-align: center;
    font-size:20px;
    line-height:25px;
    margin-bottom: 5px;
    margin-top: 0px;
}

检查数据是否已发布，然后打印消息。

这是代码

<?php
  if($_POST){
       <div  class="alert  alert-success">
          <button type="button" class="close" >
                 &times;
          </button>
        <p><?php    echo $msg;        ?></p>
       </div>
    }    
?>

 <div class="alert alert-success <?=isset($_POST['update']) ? '' : 'hidden' ?>">
    <button type="button" class="close" >
                &times;
    </button>
 <p><?php    echo $msg;        ?></p>
 </div>

如果没有post call，这将把hidden css类应用到您的警报框中。这看起来像引导程序，所以应该已经定义了类。

该片段未经测试，但它应该会给您一个大致的想法。