我是php的新手，还在学习。im需要的是，一旦用户在age字段中输入了非整数的内容而不提交给mysql，就停止表单。以下是我的基本表格和代码：
添加.html->

<form action="add.php" method="post" name="form1">
    <table width="25%" border="0">
        <tr> 
            <td>Name</td>
            <td><input type="text" name="name"></td>
        </tr>
        <tr> 
            <td>Age</td>
            <td><input type="text" name="age"></td>
        </tr>
        <tr> 
            <td>Email</td>
            <td><input type="text" name="email"></td>
        </tr>

        <tr> 
            <td></td>
            <td><input type="submit" name="Submit" value="Add"></td>
        </tr>
    </table>
</form>

下面是进程文件add.php->

<?php

     error_reporting(E_ALL);
     ini_set('display_errors', 1);
     //including the database connection file
      include_once("config.php");

      if(isset($_POST['Submit'])) { 
       $name = mysqli_real_escape_string($mysqli, $_POST['name']);
       $age = mysqli_real_escape_string($mysqli, $_POST['age']);
       $email = mysqli_real_escape_string($mysqli, $_POST['email']);

        // checking integer fields
        if (!ctype_digit($age)){
        echo "<font color='red'>ERREUR!  age n'est PAS entier</font><br/>";
         }
         // checking empty fields
         if(empty($name) || empty($age) || empty($email)) {

          if(empty($name)) {
          echo "<font color='red'>Name field is empty.</font><br/>";
           }

            if(empty($age)) {
           echo "<font color='red'>Age field is empty.</font><br/>";
           }

           if(empty($email)) {
            echo "<font color='red'>Email field is empty.</font><br/>";
            }

           //link to the previous page
           echo "<br/><a href='javascript:self.history.back();'>Go Back</a>";
            } else { 
           // if all the fields are filled (not empty) 

    //insert data to database   
    $result = mysqli_query($mysqli, "INSERT INTO users(name,age,email)    VALUES('$name','$age','$email')") or die(mysql_error());

    //display success message
    echo "<font color='green'>Data added successfully.";
    echo "<br/><a href='index.php'>View Result</a>";
      }
     }
      ?>

我读过很多帖子，但作为一个初学者，现在要深入研究javascript似乎太难了。如果这是唯一的解决方案，你可以教我-哈哈-如何实现脚本的几行。谢谢