php中如何设置<select></select>中的默认项？

Question

php中如何设置<select></select>中的默认项

Answer 1

首先，基本的用法就是<option id="id" selected="selected">男</option>;如果是要查询数据库中，是其成为默认的某一项，那就得写查询语句了，先查出来，然后再嵌套进去php输出，就可以了，例如：：<option selected="selected" value="<?php&nbsp;echo $result['genrename'];?>"><?php&nbsp;echo $result['genrename']; ?></option>

Answer 2

用selected12345<select><option>a</option><option&nbsp;selected="selected">b</option>&nbsp;<option>c</option>&nbsp;</select>&nbsp;如果option使用php循环输出的，那么也可以12345<select><?php&nbsp;foreach($arr&nbsp;as&nbsp;$key&nbsp;=>&nbsp;$value)&nbsp;{&nbsp;?>&nbsp;&nbsp;&nbsp;&nbsp;<option&nbsp;<?php&nbsp;if&nbsp;($_text&nbsp;==&nbsp;$value)&nbsp;{&nbsp;?>selected="selected"&nbsp;<?php&nbsp;}&nbsp;?>><?php&nbsp;echo&nbsp;$value;&nbsp;?></option><?php&nbsp;}&nbsp;?></select>

Answer 3

点击还原时重设这个下拉列表的options集合的长度即可。<select id="members" name="members"><option value="Mr&nbsp;green">Mr&nbsp;green</option><option value="Mr&nbsp;john">Mr john</option></select><input type="button" name="button" id="button" value="还原" onclick="restoreMembers()" /><script language="javascript">function restoreMembers(){var objDrop =document.getElementById("members");objDrop.options.length=1;objDrop.options[0] =new Option("选择职位","");}</script>