在不使用javascript的情況下在下拉列表中顯示所選值

Question

如何在不使用javascript的情況下在phtml的下拉菜單中選擇選項時顯示所選值。這是我到目前為止嘗試過的！。我正試着用magento

<form action="<?php echo $this->getUrl('customer/products/simpleproduct') ?>" enctype="multipart/form-data" method="post" id="form-customer-product-new">
<table class="tablepostion">
<tr>
<td>
<select id="sizeoption">
<option value="1">Small</option>
<option value="2">Medium</option>
<option value="3">Large</option>
</select>
<?php 
$a = $_POST['sizeoption'];
echo $a;

?>
</td>
</tr>
</table>

Answer 1

You need to add name of your dropdown.

<select name="mysize" id="sizeoption">
<option value="Small">Small</option>
<option value="Medium">Medium</option>
<option value="Large">Large</option>
</select>

<?php 
$a = $_REQUEST['mysize'];
echo $a;
?>

Thanks,

Answer 2

嘗試這個

<?php $a = $_POST['sizeoption']; ?>
<table class="tablepostion">
  <tr>
      <td>
          <select id="sizeoption">
          <option <?php echo ($a ==1)?'selected="selected"' : '' ?>  value="1">Small</option>
          <option <?php echo ($a ==2)?'selected="selected"' : '' ?> value="2">Medium</option>
          <option <?php echo ($a ==3)?'selected="selected"' : '' ?> value="3">Large</option>
          </select>
      </td>
 </tr>
</table>