用php实现真正的－－－－连动下拉列表
类别: PHP教程 
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;
?>
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