我现在在哪里
我有一个HTML表，其中有许多行由SQL语句的PHP foreach循环填充。该表的最后一列包含一个按钮下拉列表，其中一个是“分配车辆”。该按钮触发带有选择框的bootstrap-4模态。该表是车辆列表，模态中的选择框是员工列表。
我要发生的事情
用户单击表中的“分配车辆”。弹出模式，允许用户选择要分配的员工。然后，将vehicle_id和employee_id传输到另一个页面进行处理。
代码
<table id="example23" class="display nowrap table table-hover table-striped table-bordered" cellspacing="0" width="100%" data-order='[[ 3,"asc" ]]' data-page-length='25'>
<thead>
<tr>
<th class="text-center">Year</th>
<th class="text-center">Make</th>
<th class="text-center">Model</th>
<th class="text-center">Unit #</th>
<th class="text-center">Asset #</th>
<th class="text-center">Assignee</th>
<th class="text-center">Admin</th>
</tr>
</thead>
<tfoot>
<tr>
<th class="text-center">Year</th>
<th class="text-center">Make</th>
<th class="text-center">Model</th>
<th class="text-center">Unit #</th>
<th class="text-center">Asset #</th>
<th class="text-center">Assignee</th>
<th class="text-center">Admin</th>
</tr>
</tfoot>
<tbody>
<?php
$a = 0;
$u = 0;
foreach ($vehicle->fetchAll() as $row){
$a++;
$u++;
?>
<tr>
<td style="text-align: center; vertical-align: middle;"><?php echo $row['Veh_Year']; ?></td>
<td style="text-align: center; vertical-align: middle;"><?php echo $row['Vehicle_Make_Make']; ?></td>
<td style="text-align: center; vertical-align: middle;"><?php echo $row['Vehicle_Model_Model']; ?></td>
<td style="text-align: center; vertical-align: middle;"><?php echo $row['Veh_Unit_No']; ?></td>
<td style="text-align: center; vertical-align: middle;"><?php echo $row['Veh_Asset_No']; ?></td>
<!--Creates Unassigned Tag for Vehicle if Database doesn't return a value for Assignee First Name -->
<?php if (!empty($row['First_Name'])) { ?>
<td style="text-align: center; vertical-align: middle;"><a href="#"><?php echo $row['First_Name']; echo ' ' . $row['Last_Name']; ?></a></td>
<?php } else { ?>
<td style="text-align: center; vertical-align: middle;"><strong>Unassigned</strong></td>
<?php } ?>
<td style="text-align: center;">
<div class="btn-group">
<button type="button" class="btn btn-info dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Admin action
</button>
<div class="dropdown-menu">
<?php if (!empty($row['First_Name'])) { ?>
<a class="dropdown-item" href="#" data-toggle="modal" data-target="#Unassign_<?php echo $u; ?>">Unassign Vehicle</a>
<?php } else { ?>
<a class="dropdown-item" href="#" data-toggle="modal" data-target="#Assign_<?php echo $a; ?>">Assign Vehicle</a>
<?php } ?>
<a class="dropdown-item" href="https://mailmelater.com/modify-vehicle.php?vehid=<?php echo $row['Veh_ID']; ?>">Modify Vehicle</a>
<a class="dropdown-item" href="https://mailmelater.com/retire-vehicle.php?vehid=<?php echo $row['Veh_ID']; ?>">Retire Vehicle</a>
</div>
</td>
</tr>
<div class="modal fade" id="Unassign_<?php echo $u; ?>" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog modal-dialog-centered" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLongTitle">Unassign Confirmation</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
Are you certain that you would like to unassign the
<span class="font-weight-bold"><?php echo $row['Vehicle_Make_Make']; echo ' ' . $row['Vehicle_Model_Model']; ?></span>
from
<span class="font-weight-bold"><?php echo $row['First_Name']; echo ' ' . $row['Last_Name']; ?></span>?
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary waves-effect waves-light" data-dismiss="modal">Cancel</button>
<button type="button" class="btn btn-info waves-effect waves-light">
<a class="text-white" href="https://mailmelater.com/includes/functions/fn-unassign-vehicle.php?vehid=<?php echo $row['Veh_ID']; ?>">Confirm</a>
</button>
</div>
</div>
</div>
</div>
<div class="modal fade" id="Assign_<?php echo $a; ?>" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog modal-dialog-centered" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLongTitle">Assign Vehicle to User</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<select name="check" class="select2 form-control custom-select" style="width: 100%;">
<?php foreach ($assign->fetchall() as $assignrow) { ?>
<option value="<?php echo $assignrow['Emp_ID']; ?>">
<?php echo $assignrow['First_Name']; echo ' ' . $assignrow['Last_Name']; ?>
</option>
<?php } $assign->closeCursor(); ?>
</select>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary waves-effect waves-light" data-dismiss="modal">Cancel</button>
<button type="button" class="btn btn-info waves-effect waves-light">
<a class="text-white" href="https://mailmelater.com/includes/functions/fn-assign-vehicle.php?vehid=<?php echo $row['Veh_ID']; ?>">Confirm</a>
</button>
</div>
</div>
</div>
</div>
<?php } $vehicle->closeCursor(); ?>
</tbody>
</table>
问题
您会从代码中注意到“分配”模式ID是动态分配的。我觉得这是必要的，以便将相应行的车辆ID传递给模式。不幸的是，只要模态ID是动态分配的，此解决方案仅适用于第一条记录（或当Veh_ID = 1时），对于其他任何行，模态都会显示在选择框中，但是没有结果，选择框为空。
即使具有动态分配的ID，“ Unassign”模态也可以按编写时的状态很好地工作。从我的角度来看，这似乎只是选择框的问题，尽管我充其量只是一名新手。
示例
Example page with both functions active。
在上面链接的页面上，对于表中的任何行，如果将鼠标悬停在“修改车辆”上，您都可以在地址栏中看到ID。在任何没有vehicle_id = 1的车辆上单击“分配车辆”，将在模式中产生一个空的选择框。随时根据需要分配或取消分配。