📄 productsearchajax.jsp
字号:
<%@ page language="java" import="java.util.*, com.bjsxt.shopping.category.*" pageEncoding="GB18030"%>
<%
List<Category> categories = CategoryService.getInstance().getTopCategories();
%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'ProductSearch.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript">
var req;
function init() {
if(window.XMLHttpRequest) {
req = new XMLHttpRequest();
} else if (window.ActiveXObject) {
req = new ActiveXObject("Microsoft.XMLHTTP");
}
}
function changeDrop2() {
init();
var url = "GetCategoryChilds.jsp?id=" + escape(document.frm.parent.options[document.frm.parent.selectedIndex].value);
req.open("GET", url, true);
req.onreadystatechange = callback;
req.send(null);
}
function callback() {
if(4 == req.readyState) {
if(200 == req.status) {
//alert(req.responseText);
eval(req.responseText);
}
}
}
</script>
</head>
<body>
联动菜单有好多种技术 <br>
1:提前取出来所有的内容 <br>
2:第一级菜单改变的时候, 提交到本身页面, 刷新页面<br>
3:使用Frame<br>
4:AJAX<br>
<center>第四种</center>
<center>
<form name="frm" method="get">
<select name="parent" onchange="changeDrop2()">
<option value="-1">请选择</option>
<%
for(int i=0; i<categories.size(); i++) {
Category c = categories.get(i);
%>
<option value="<%=c.getId() %>"><%=c.getName() %></option>
<%
}
%>
</select>
<select name="child">
<option value="-1">Child Not Selected!</option>
</select>
</form>
</center>
</body>
</html>
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