有没有一种方法可以从数据库中减去一个值并输入类型文本编号？

Question

来自视图的输入类型文本：

<input type="number" placeholder="Enter Amount" name="uname" id="box" required>

来自视图的模态内容：

 <p>YOUR BET:  <a class="p-1" id="betAmountResult"></a></p>
        <p>CURRENT WALLET:   <a style="color:blue;"><?php echo $_SESSION['currentWallet']?></a></p>
    
        <p class="remaining">REMAINING BALANCE:
         
          <a class="p-1" id="betAmountResult"></a></p>

Answer 1

  <input type="number" placeholder="Enter Amount" name="uname" id="box" required>

  <p>YOUR BET:  <a class="p-1" id="betAmount"></a></p>
  <!-- change id's name to betAmount -->
    <p>CURRENT WALLET:   <a style="color:blue;"><?php echo $_SESSION['currentWallet']?></a></p>

    <p class="remaining">REMAINING BALANCE:
     
      <a class="p-1" id="betAmountResult"></a></p>



  <script>

     $( document ).ready(function() {
     
        $("#box").keyup( function(){
             var betAmount = $("#box").val();
             var walletAmount = <?php echo $_SESSION['currentWallet']?>;

             var remainingAmount = walletAmount - betAmount;


            $("#betAmountResult").text(remainingAmount);
        })
   });

</script>

有没有一种方法可以从数据库中减去一个值并输入类型文本编号？

Is there a way where i can subtract a value from database and input type text number?

codeigniter