保留提交后禁用的下拉列表值

Question

我有这个包含大约 9 个下拉菜单的表单。我试图在提交后保留选定的值。我的代码适用于其中 2 个未禁用的下拉菜单，但不适用于其余 7 个禁用的下拉菜单。有没有其他方法可以为这些编写代码？

2 个未禁用的下拉菜单中的 1 个：-

<?php
$sql = "SELECT * FROM tablename1 ";
$result = mysqli_query($conn, $sql);
echo "<select name = 'account_name' id = 'idaname'>"; 
echo "<option value = ''>";
while($row = mysqli_fetch_array($result)){
    $selected = (isset($_POST['account_name']) && $_POST['account_name'] == $row['account_name']) ? 'selected = "selected"' :'';
    ?>
    <option <?php echo $selected; ?> value = "<?php echo $row['account_name']; ?>"> <?php echo $row['account_name']; ?> </option>
    <?php } ?>
    </select>

7 个禁用下拉菜单中的 2 个：-

<?php
$sql = "SELECT rsm_val FROM tablename2 ";
$result = mysqli_query($conn, $sql);
echo "<select name = 'rsm_val' id = 'rsm_val' onchange = 'runrsm()' disabled >"; 
echo "<option value = '" .$rsm_val . "'>" . $rsm_val . "</option>";
while($row = mysqli_fetch_array($result)){
    $selected = (isset($_POST['rsm_val']) && $_POST['rsm_val'] == $row['rsm_val']) ? 'selected = "selected"' :'';
    ?>
    <option <?php echo $selected; ?> value = "<?php echo $row['rsm_val']; ?>"> <?php echo $row['rsm_val']; ?> </option>
    <?php } ?>
</select>



<select name = 'boost_app' id = 'boost_app' onchange = 'runboost()' disabled>
<?php echo "<option value = '". $boost_app . "'>" . $boost_app .  "</option>"; ?>
<option <?php if($_POST['boost_app'] == 'Yes'){?> selected="true" <?php }; ?> value = "Yes">Yes</option>
<option <?php if($_POST['boost_app'] == 'No') {?> selected="true" <?php }; ?> value = "No">No</option>
</select>

Answer 1

如果禁用下拉菜单，则不会将值发送到服务器。您可以添加具有相同名称和值的隐藏输入。

<input type="hidden" name="boost_app" value="<?php echo $_POST['boost_app'];?>">
<select name = 'boost_app' id = 'boost_app' onchange = 'runboost()' disabled>
<?php echo "<option value = '". $boost_app . "'>" . $boost_app .  "</option>"; ?>
<option <?php if($_POST['boost_app'] == 'Yes'){?> selected="true" <?php }; ?> value = "Yes">Yes</option>
<option <?php if($_POST['boost_app'] == 'No') {?> selected="true" <?php }; ?> value = "No">No</option>
</select>

Answer 2

您可以改用readonly：

<select name = 'boost_app' id = 'boost_app' onchange = 'runboost()' readonly>
<?php echo "<option value = '". $boost_app . "'>" . $boost_app .  "</option>"; ?>
<option <?php if($_POST['boost_app'] == 'Yes'){?> selected="true" <?php }; ?> value = "Yes">Yes</option>
<option <?php if($_POST['boost_app'] == 'No') {?> selected="true" <?php }; ?> value = "No">No</option>
</select>

这将不允许用户编辑值，并且也会通过表单提交发送数据。 Learn more about it.

编辑：如果readonly不适用于<select>标签，那么您可以disable除所选1之外的所有选项。喜欢：

<select name = 'boost_app' id = 'boost_app' onchange = 'runboost()'>
<?php echo "<option value = '". $boost_app . "' disabled>" . $boost_app .  "</option>"; ?>
<option <?php if($_POST['boost_app'] == 'Yes'){?> selected="true" <?php }else{echo "disabled";} ?> value = "Yes">Yes</option>
<option <?php if($_POST['boost_app'] == 'No') {?> selected="true" <?php }else{echo "disabled";} ?> value = "No">No</option>
</select>

或者你可以有一个同名的hidden输入，比如：

<input type="hidden" name="boost_app" value="<?=$_POST['boost_app']?>">
<select name = 'boost_app' id = 'boost_app' onchange = 'runboost()' disabled>
<?php echo "<option value = '". $boost_app . "'>" . $boost_app .  "</option>"; ?>
<option <?php if($_POST['boost_app'] == 'Yes'){?> selected="true" <?php }; ?> value = "Yes">Yes</option>
<option <?php if($_POST['boost_app'] == 'No') {?> selected="true" <?php }; ?> value = "No">No</option>
</select>

Answer 3

我使用它来使下拉菜单显示为“已禁用”

$(#boost_app).css({"background-color":"rgb(238, 238, 238)", "pointer-events":"none"}).keydown(false)