Question

通过从数据库表中获取值，在while循环中在php中打印下拉列表。这是代码：

  <select name='supervisor' class='form-control' name='supervisor'>
  <?php
  $sql = "SELECT username FROM system_user where type='supervisor'";
  $result = mysql_query($sql); 
  while ($row = mysql_fetch_array($result)) {
  echo "<option value='" . $row['username'] ."'>" . $row['username'] ."</option>";}?>
  </select>

如何为此设置默认值？我想将一个“用户名”值作为默认值。我怎样才能做到这一点？

Answer 1

<select name='supervisor' class='form-control' name='supervisor'>
  <?php
      $sql = "SELECT username FROM system_user where type='supervisor'";
      $result = mysql_query($sql); 
      while ($row = mysql_fetch_array($result)) {
          $sel = ''; if($row['username'] == 'usename'){ $sel = 'selected'; }
          echo "<option $sel value='" . $row['username'] ."'>" . $row['username'] ."</option>";
      } ?>
  </select>

Answer 2

function dropDown(array $array, $default = null, $select_attrs = '')
{

     $s = '<select $select_attr>';
     foreach((array)$array as $k => &$v) {
          $default = ($v === $default) ? 'selected' : null;
          $s.='<option '.$default.' >'.$v.'</option>';
     }
     return $s;
}

Answer 3

这个对我有用......

<select name='supervisor' class='form-control' name='supervisor'>


<?php
  $sql = "SELECT username FROM system_user where type='supervisor'";
  $result = mysql_query($sql); 
  while ($row = mysql_fetch_array($result)) {
      $sel = ''; if($row['username'] == 'usename'){ $sel = 'selected'; }
      echo "<option $sel value='" . $row['username'] ."'>" . $row['username'] ."</option>";
  } ?>

Php：在循环中设置默认下拉值

3 个答案: