当购物车中的数量发生变化时，如何使用PHP中的jquery更新价格

Question

Hi I am developing a shopping cart using jquery.So far I have listed the products and their details. Here is my code

foreach( $_SESSION['r'] as $key=>$ar):

$cnt++;
 ?>   <tr>

        <td align="center"><?php echo $ar['Name']?></td>
        <td align="center"><?php echo $ar['Price']?></td>
       <td align="center">
       <select class="myclass" name="qty" id='qty<?php echo $cnt;?>'>
       <?php for ($i=1; $i<=100; $i++) {
               $y="";
               if( $i==$_SESSION['r'][$key]['Quantity']){
                $y="selected";
                }
                echo "<option ";
                echo "value=\"$i\" ".$y.">", $i, "</option>\n";


            } ?>

       </select>
       </td>

        <?php $x=$x+$ar['Quantity']; ?>

         <td name="price" id="price"><span class="priceDisplay<?php echo $cnt;?>"><?php echo $ar['Total']; ?></span></td>
    <!--   <td id="tot" align="center"><?php// echo $ar['Total'] ?></td> -->
        <input type='hidden' name='id' id="pid" value='<?php echo $ar['Id']; ?>'>
        <input type='hidden' name='price' id="price" value='<?php echo $ar['Price'] ?>' class="input">  
       <td><input type='checkbox' name='remove' value='Remove' onCheck="$(this).closest('tr').remove();">

Here, my id for drop down list in each row is different.It is generated automatically as the loop continues. All I need is that, when the user changes a product's quantity corresponding price has to be changed. The thing is that, when the user changes the quantity, jquery has to be invoked.It should pass the select id. But my select id is different for each product. So how I achieve it? Please help me.

Answer 1

您是否尝试过在计算总价格的select上实现onChange（）函数？您可以将一个类添加到价格和数量的容器中，以进行区分，然后遍历它们。

Answer 2

Try this

<td align="center" id="price"><?php echo $ar['Price']?></td>
       <td align="center">

<select class="myclass" name="qty" id='qty<?php echo $cnt;?>' onchange="get_price(this)">
       <?php for ($i=1; $i<=100; $i++) {
               $y="";
               if( $i==$_SESSION['r'][$key]['Quantity']){
                $y="selected";
                }
                echo "<option ";
                echo "value=\"$i\" ".$y.">", $i, "</option>\n";


            } ?>

       </select>

<script>
function get_price(val)
{
    var qty = $(val).val();
    var price = $("#price").html();
    var price =  qty * price;
    $("#price").html(price);
    return false;


}

</script>