Question

我有一个下拉列表，其中填充了从db获取的数据。我需要将此下拉列表的选定索引值分配为按钮的ID。真的有可能吗？

我的代码

<select name="customer" onchange="getCustomer()"  id="customer" class="form-control" style="width: 180px !IMPORTANT;">
 <option value="">--Select Customer--</option>
                                 <?php
                                 $sql = mysqli_query($db,"SELECT * FROM customer ");
                                 while($row= mysqli_fetch_array($sql))
                                 {
                                 ?>
                                 <option value="<?php echo $row['custid'];?>"><?php echo $row['customername'];?></option>
                                 <?php
                               }
                                 ?>

 </select>
                                    </div>
                                    <button name="custbt" id="1" class="label-text col-form-label userinfo"><a href="#vCenteredModal" data-toggle="modal">Show customer details</a></button> 

  <script>
          function getCustomer()
          {
            var e = document.getElementById("customer");
            var cust = e.options[e.selectedIndex].value;
          //  alert(cust);custbt
            //document.getElementByName("custbt").id=cust;
            document.getElementByName(custbt).id=cust;

          }
    </script>

Answer 1

可能会解决您的问题。我在btn上添加了一个名为CustomerModalBttn的类。

尝试一下

d.receipt

Answer 2

ID必须以字母开头。

<button name="custbt" id="a1" class="label-text col-form-label userinfo"><a href="#vCenteredModal" data-toggle="modal">Show customer details</a></button>

var customer = document.getElementById("customer");
    var a1 = document.getElementById("a1");

    customer.addEventListener("change",function(){
        a1.removeAttribute("id");
        a1.setAttribute("id",customer.value);
    });

Answer 3

如果您通过url传递客户ID，然后添加if ($row['custid'] == $_GET['custid']) echo 'selected'参数，只需添加一些条件$_GET。 ...

while($row= mysqli_fetch_array($sql))
{ ?>
   <option <?php if ($row['custid'] == $_GET['custid']) echo 'selected'; ?> value="<?php echo $row['custid'];?>">
<?php echo $row['customername'];?>
</option>
<?php } ?>
...

通过javascript

3 个答案: