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AJAX教程之由省份選擇城市_AJAX教程

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推薦：xmlHttpRequest實(shí)踐之無(wú)刷新驗(yàn)證用戶名
現(xiàn)在好多網(wǎng)站上的注冊(cè)都用了無(wú)刷新驗(yàn)證用戶名,這種效果咋看感覺(jué)很復(fù)雜很難實(shí)現(xiàn),其實(shí)它里面用到了Ajax中的核心xmlHttpRequest這個(gè)類,如果只是單單想實(shí)現(xiàn)這個(gè)效果,壓根就不用引用Ajax.Net中的組件,因?yàn)楦杏X(jué)有點(diǎn)大材小用,下面是具體實(shí)現(xiàn)這種效果的方法,希望能給

一、test.html

<html>
<head>
<title>MyHtml.html</title>

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">


</head>
<script type="text/javascript">
function getResult(stateVal) {
var url = "servlet/SelectCityServlet?state="+stateVal;
if (window.XMLHttpRequest) {
req = new XMLHttpRequest();
}else if (window.ActiveXObject) {
req = new ActiveXObject("Microsoft.XMLHTTP");
}
if(req){
req.open("GET",url, true);
req.onreadystatechange = complete;
req.send(null);
}
}

function complete(){
if (req.readyState == 4) {
if (req.status == 200) {
var city = req.responseXML.getElementsByTagName("city");
//alert(city.length);
var str=new Array();
for(var i=0;i<city.length;i++){
str[i]=city[i].firstChild.data;
}
//alert(document.getElementById("city"));
buildSelect(str,document.getElementById("city"));
}
}
}



function buildSelect(str,sel) {
sel.options.length=0;
for(var i=0;i<str.length;i++) {
sel.options[sel.options.length]=new Option(str[i],str[i])
}
}
function test(){
//alert("test");
}
</script>
<body>
<select name="state" onChange="getResult(this.value)">
<option value="">請(qǐng)選擇</option>>
<option value="zj">浙江</option>>
<option value="zs">江蘇</option>>
</select>
<select id="city"></select>
</body>
</html>
二、servlet源程序

package com.stephen.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import org.dom4j.*;


import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* @author stephen
*
* TODO To change the template for this generated type comment go to Window -
* Preferences - Java - Code Style - Code Templates
*/
public class SelectCityServlet extends HttpServlet {


public SelectCityServlet() {
super();
}

public void destroy() {
super.destroy();
}

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {


response.setCharacterEncoding("UTF8");
response.setContentType("text/xml");
response.setHeader("Cache-Control", "no-cache");
String state = request.getParameter("state");


Document document = DocumentHelper.createDocument();

Element root = document.addElement("state");

Element city = null;
if("zj".equals(state)){
city = root.addElement("city");
city.setText("杭州");
city = root.addElement("city");
city.setText("huzhou");
}else{
city = root.addElement("city");
city.setText("南京");
city = root.addElement("city");
city.setText("蘇州");
city = root.addElement("city");
city.setText("yangzhou");
}


PrintWriter out=response.getWriter();
String s = root.asXML();

out.write(s);
out.close();
}

}

 

分享：jPager一個(gè)適合Ajax+JSON+jQuery環(huán)境使用的多功能頁(yè)碼欄
事由：由于最近在測(cè)試開(kāi)發(fā)的一個(gè)ASP.NET MVC的項(xiàng)目需要用到頁(yè)碼欄（并且需要用到AJAX+JSON傳輸數(shù)據(jù)），而微軟發(fā)布的.NET3.5 CTP 的MVCTOOLKIT里面又沒(méi)有提供，網(wǎng)上找了下似乎也沒(méi)有太稱心的，于是就自己動(dòng)手做一個(gè)。 由于這個(gè)項(xiàng)目用到頁(yè)碼欄的地方大多是后臺(tái)

來(lái)源：模板無(wú)憂//所屬分類：AJAX教程/更新時(shí)間：2010-03-04
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