Onchange选择不刷新

Question

When change value my page is refresh because i have to send value to query data but my selector doesn't show value when selected

<form name='active' action='' method='GET'>
<select class="form-control" id="section" name="section" onchange="list()" >
<option value="0"> - - Select All - - </option>
  <?php
       $section = $db->fetch();
       foreach ($section as $key => $v) {
        $section_name = $v['section'];
        echo "<option value='".$section_name."'>",$section_name,"</option>";
       }
?>                       

<script type="text/javascript">
  function list(){ 
      document.active.submit(); 
  }
</script>

Answer 1

For an option in a dropdown other than the first one to be selected on page load, you have to add the selected="selected" attribute to one of the <option> elements like so :

<select class="form-control" id="section" name="section" onchange="list()" >
  <option value="0"> - - Select All - - </option>
  <option value="1" selected="selected"> I'm selected </option>
  <option value="2"> I'm not selected </option>
</select>

In your case, it implies checking either the GET variable or the database value in your foreach loop to set the attribute accordingly.