用PHP实现真正的连动下拉列表_php教程

下面的两个文件copy到同一个文件下，通过web路径访问index.html看看吧，这个是通过iframe来实现的连动更新，list.php目前的内容比较简单，你看通过list.php来进行数据库查询，然后显示出查询的结果列表。

index.html

<body>

<form name="myfrm">

<select name="mlist" onchange="changes();">

<option value="0">请选择...</option>

<option value="北京">北京</option>

<option value="通化">通化</option>

</select> 

<select name="slist">

</select>

<iframe id="frame" src="list.php?city=" style="display:none;"></iframe>

<script language="javascript">

function changes(){

frame.location.href = "list.php?city=" document.myfrm.mlist.value;

}

</script>

</form>

</body>

list.php

<?php

$data = array("北京"=>array("小强","旺财","小强他爹"),

"通化"=>array("小温","小宋","他们儿子"),);

$city = $_GET["city"];

$result = $data[$city];

$str = "<script language="javascript">list = parent.document.myfrm.slist;list.length = 0;";

if($result==null)

$str .= "tmp = new Option("......", "");list.options[0] = tmp;";

else

foreach($result as $i => $value)

$str .= "tmp = new Option("{$value}", "{$value}");list.options[$i] = tmp;";

$str .= "</script>";

echo $str;

?>

(责任编辑：admin)

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用PHP实现真正的连动下拉列表