一个Ajax小示例
//------------Ajax处理是否相同名字-------------------var xmlHttpRequest; //1. 创建XMLHttpRequest组件function createXmlHttpRequest(){if(window.ActiveXObject){ return new ActiveXObject("Microsoft.XMLHTTP");}else if(window.XMLHttpRequest){ return new XMLHttpRequest();}if(xmlHttpRequest == null){alert("未能成功创建XMLHttpRequest组件!");return;}}function checkSameName(sameName){var url = "checkSameName?operatorId=" + sameName;// 1. 创建XMLHttpRequest组件xmlHttpRequest = createXmlHttpRequest();// 2. 设置回调函数xmlHttpRequest.onreadystatechange = myResponse;// 3. 初始化XMLHttpRequest组件xmlHttpRequest.open("GET",url,true);// 4. 发送请求xmlHttpRequest.send(null);}//--处理response------function myResponse(){ if(xmlHttpRequest.readyState == 4 && xmlHttpRequest.status == 200){ var str = xmlHttpRequest.responseText; if(str == 0){ document.getElementById("theSameName").innerHTML="<font color='red'>恭喜你,可以用此ID注册!</font>"; }else{ document.getElementById("theSameName").innerHTML="<font color='red'>对不起,此ID已经注册过了!</font>"; } }} <p>登录ID：<input type="text" name="operatorId" size="20" value= '${operatorId }' />例如:A00001</p> public class CheckSameName extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html");PrintWriter out = response.getWriter();String id = request.getParameter("operatorId");if(id == null || id.equals("")){out.println("Not none!");}else{Connection conn = null;PreparedStatement pstmt = null;ResultSet rs = null;int isRegist = 0;String sql = "select operator_ID from TOperator where operator_ID = ?";try{conn = DbUtil.getConnection();pstmt = conn.prepareStatement(sql);pstmt.setString(1, id);rs = pstmt.executeQuery();if(rs.next()){isRegist = 1;}}catch(SQLException e){e.printStackTrace();}finally{new DbUtil().close(rs, pstmt, conn);}out.println(isRegist);out.flush();out.close();}}} 这个,应该算是Ajax吧!
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