function handleStateChangeType() { if(xmlHttp.readyState == 4) { if(xmlHttp.status == 200) { updateModelsListType(); } } }function updateModelsListType() { clearModelsListType(); var types = xmlHttp.responseXML.getElementsByTagName("car_type"); var id = ""; var name = ""; var c = document.getElementById("car_type"); for(var i = 0; i < types.length; i++) { id = types[i].childNodes[0].firstChild.nodeValue; name = types[i].childNodes[1].firstChild.nodeValue; option = document.createElement("option"); option.appendChild(document.createTextNode(name)); option.setAttribute("value", id); c.appendChild(option); } }function clearModelsListType() { var car_type = document.getElementById("car_type"); while(car_type.childNodes.length > 0) { car_type.removeChild(car_type.childNodes[0]); } }String goods_name = new String(request.getParameter("goods_name").getBytes("ISO-8859-1"), "gb2312");
StringBuffer results = new StringBuffer("<types>"); Db db = new Db(); GoodsDao goodsDao = new GoodsDao(db.getConn()); List<String> list_type = goodsDao.getTypeDis(goods_name); response.setContentType("text/html;charset=UTF-8");
db.close();
for(String type : list_type) { results.append("<car_type><id>" + type + "</id><name>" + type + "</name></car_type>"); } results.append("</types>");
<html>
<head><title>test</title>
<script language="JavaScript" type="text/javascript">
<!--
var city=[
["北京","上海","天津","重庆"]
["武汉","黄石","孝感","恩施"]
];function getCity()
{
var sltProvince = document.forms["cityForm"].elements["province"];
var sltCity = document.forms["cityForm"].elements["city"];
var provinceCity = city[sltProvince.selectedIndex-1];
sltCity.length=1;
for(var i=0;i<provinceCity.length;i++)
{
sltCity[i+1] = new Option(provinceCity[i],provinceCity[i]);
}
}
-->
</script>
</head>
<body>
<form action=test.jsp" name="cityForm">
<select name="province" onchange="getCity()">
<option value="0">请选择省份</option>
<option value="直辖市">直辖市</option>
<option value="湖北省">湖北省</option>
</select>
<select name="city">
<option value="0">请选择所在城市</option>
</select>
</form>
</body>
</html>
<td width="169">
名称:<select id="goods_name" name="goods_name" style="background-color:#66FF00;" onclick="refreshListType();">
<c:forEach var="name" items="${list_name}">
<option value="${name}">${name}</option>
</c:forEach>
</select>
</td>
<td width="169">
车型:<select id="car_type" name="car_type" style="background-color:#66FF00;" onclick="refreshListSize();"></select>
</td>
var xmlHttp;function createXMLHttpRequest() {
if (window.ActiveXObject) {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
else if (window.XMLHttpRequest) {
xmlHttp = new XMLHttpRequest();
}
}
function refreshListType() {
var p = document.getElementById("goods_name").value;
var url = "form1Servlet?goods_name=" + p;
createXMLHttpRequest();
xmlHttp.onreadystatechange = handleStateChangeType;
xmlHttp.open("GET", url, true);
xmlHttp.send(null);
}
function handleStateChangeType() {
if(xmlHttp.readyState == 4) {
if(xmlHttp.status == 200) {
updateModelsListType();
}
}
}function updateModelsListType() { clearModelsListType();
var types = xmlHttp.responseXML.getElementsByTagName("car_type");
var id = "";
var name = "";
var c = document.getElementById("car_type"); for(var i = 0; i < types.length; i++) {
id = types[i].childNodes[0].firstChild.nodeValue;
name = types[i].childNodes[1].firstChild.nodeValue;
option = document.createElement("option");
option.appendChild(document.createTextNode(name));
option.setAttribute("value", id);
c.appendChild(option);
}
}function clearModelsListType() {
var car_type = document.getElementById("car_type");
while(car_type.childNodes.length > 0) {
car_type.removeChild(car_type.childNodes[0]);
}
}String goods_name = new String(request.getParameter("goods_name").getBytes("ISO-8859-1"), "gb2312");
StringBuffer results = new StringBuffer("<types>");
Db db = new Db();
GoodsDao goodsDao = new GoodsDao(db.getConn());
List<String> list_type = goodsDao.getTypeDis(goods_name);
response.setContentType("text/html;charset=UTF-8");
db.close();
for(String type : list_type) {
results.append("<car_type><id>" + type + "</id><name>" + type + "</name></car_type>");
}
results.append("</types>");
response.setContentType("text/xml");
response.getWriter().write(results.toString());
希望你能看懂
基本使用 30分钟绝对够了
<script language ="JavaScript" type="">function sub()
{
document.myform.submit("beginConfig.jsp");
return false;
}
</script>
<form action="beginConfig.jsp" method="POST" name="myform" onsubmit= 重点: "return check() " >
<table align="center">
<tr>
<td>请选择所在的省</td>
<td>
<select name="province" onchange="return sub()"> <%
for (int i = 0; i < ary.size(); i++) {
TrainProvince tra = (TrainProvince) ary.get(i);
%>
<option value="<%=tra.getProviceid()%>" ><%=tra.getProvicename() %> </option>
<%}} catch (Exception ex) {} %>
</select> </td>
</tr>
</table>
</form>
能实现你说的功能!!