php + js 勾选A select 同步B select
要如何写勾选A时，B会同步?
<br><select id="A" name="A" ><br><?php<br> $query = $db->query("<br> SELECT * FROM `select`"); <br> foreach($query->result() as $row){ <br>?> <br><option value="<?php echo $row->id;?>"><?php echo $row->name;?></option><br><?php<br> }<br>?> <br></select><br> <br> <br><?php<br> $query = $db->query("<br> SELECT * FROM `test`"); <br> foreach($query->result() as $row){ <br>?> <br><select id="B" name="B[]" ><br><?php<br> $query1 = $db->query("<br> SELECT * FROM `select`"); <br> foreach($query1->result() as $row){ <br>?> <br><option value="<?php echo $row1->id;?>"><?php echo $row1->name;?></option><br><?php<br> }<br>?> <br></select><br><?php<br> }<br>?> <br>------解决思路----------------------
首先用js控制，a修改时，b也修改。
然后a onchange时，执行一个ajax，更新db
