使用Jquery在foreach循环中从多个输入框中拉取数据

Question

I am creating an order form for a project. I pulled data from the database with the Foreach loop to the table I created. But when I multiply the quantity and unit price data, the code works only for the data in the first row of the table. How can I revise this code for all incoming loop data?

Cart.php:

<form action="" method="POST">

<table class="table table-sm mb-3 text-center align-middle">
   <thead>
      <tr>
         <th>Product Name</th>
         <th>Quantity</th>
         <th>Unit Price</th>
         <th>Total Price</th>
      </tr>
   </thead>
   <tbody>
      <?php foreach($ProductTbl as $productdata){ ?>
      <tr>
         <td><?= $productdata->productname ?></td>
         <td><input class="w-25 text-center quantity" type="text" name="quantity[]" value="0"></td>
         <td><input class="w-25 text-center unitprice" type="text" name="unitprice[]" value="<?= $productdata->unitprice ?>" disabled="disabled"></td>
         <td><input class="w-25 text-center totalprice" type="text"  name="totalprice[]" value="" disabled="disabled"> €</td>
      </tr>
      <?php } ?>
   </tbody>
</table>

Javascript code:

$(document).ready(function() {
    $('.quantity').keyup(function() {
    var quantity = $('.quantity').val();
    var unitprice = $('.unitprice').val();
    var totalprice = $('.totalprice').val();
 
    var result = quantity * unitprice;
      $('.totalprice').val(result);
    });
  });
});

Print: Image

How do I edit the code to run on all lines?

Answer 1

You've given your inputs a class , not an id . This means you cannot easily distinguish between them. However, with a bit of clever JQuery code you can identify the table row in which the quantity was changed, and then get the quantity and unitprice and set the totalprice :

$(document).ready(function() {
    $('.quantity').keyup(function() {
        let tableRow = $(this).parent().parent();
        let quantity = tableRow.find('.quantity').val();
        let unitprice = tableRow.find('.unitprice').val(); 
        let totalprice = quantity * unitprice;
        tableRow.find('.totalprice').val(totalprice);
    })
});

So here we take the quantity input, $(this) , and get the parent twice: First the <td></td> and then the <tr></tr> . We store this in tableRow . Given that we now know the table row, we can get access to the inputs by using find() .

For example code see: https://codepen.io/kikosoft/pen/oNMjqLd