Ajax实现动态显示并操作表信息的方法

$(function () {
  $.ajaxSetup({
    async:false
  });
    var url = "/Task/Fenlei";    //servlet的url
    data = {};
    data.flag = "all";
  $.post(url,data,function (result) {
    for(var i=0;i<result.getAll.length;i++){
      var id = result.getAll[i].fenlei_Id;
      var name = result.getAll[i].fenlei_Name;
      var newrow = "<tr id='tr"+id+"'><td>"+result.getAll[i].fenlei_Id+"</td><td id='td"+id+"'>"+result.getAll[i].fenlei_Name+
        "</td><td><button onclick='del("+id+")''>删除</button><button onclick='edit("+id+")'>修改</button></td></tr>"
      $("#AllInfo tr:last").after(newrow);
    }
  },"json");
    $("#add").click(function () {
      addData={};
      var name = $("#name").val();
      addData.name = name;
      addData.flag = "add";
      $.post(url,addData,function (result) {
        var id = result.aFenlei.fenlei_Id;
        var name = result.aFenlei.fenlei_Name;
          var newrow = "<tr id='tr"+id+"'><td>"+result.aFenlei.fenlei_Id+"</td><td id='td"+id+"'>"+result.aFenlei.fenlei_Name+
            "</td><td><button onclick='del("+id+")'>删除</button><button onclick='edit("+id+")'>修改</button></td></tr>"
          $("#AllInfo tr:last").after(newrow);
        
 
      },"json");
    });
});
function del(id) {
  console.log(id);
  var url = "/Task/Fenlei";
  delData = {};
  delData.flag = "delete";
  delData.id = id;
  $.post(url,delData,function (result) {
     if(result) {
       alert("删除成功");
       $("#tr"+id).remove();
     } else {
       alert("删除失败");
     }
  },"json");
};
function edit(id) {
  var url = "/Task/Fenlei";
  editData = {};
  editData.flag = "update";
  var oldname = $("#td"+id).text();
  $("#td"+id).html("<input type='text'class='Input' id='new' name='FenleiName' value='"+oldname+"'/>");
  $("#new").blur(function () {
    var newname = $(".Input").val();
    editData.newname = newname;
    console.log(newname);
    $("#td"+id).html("<td id='td"+id+"'>"+newname+"</td>");
    $.post(url,editData,function(result){
      if(result) {
        alert("修改成功");
      } else {
        alert("修改失败");
      }
    },"json");
  });
}

<%@include file="../inc/top.jsp"%>
<script src="Fenlei.js"></script>
<div class="Classify">
  <h3 align="center">项目管理信息表</h3>
  <div class="divBack">
    <img src="#" />
  </div>
  <div class="divAdd">
  分类名称：<input type="text" id="name"/>
  <button type="button" class="btn-primary" id="add">添加</button>
   </div>
  <table class="table"id="AllInfo">
    <tr>
      <th>分类Id</th>
      <th>分类名称</th>
      <th>操作</th>
    </tr>
  </table>
</div>
<%@include file="../inc/bottom.jsp"%>

public class FenleiServlet extends HttpServlet {
  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
      doGet(request,response);
  }
  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    request.setCharacterEncoding("utf-8");
    response.setCharacterEncoding("utf-8");
    String name = request.getParameter("name");     //项目分类名称
    String flag = request.getParameter("flag");
    String id = request.getParameter("id");       //项目分类Id
    FenleiService cs = new FenleiService();
    JSONObject json = new JSONObject();
    if("all".equals(flag)) {
      List<FenleiBean> list = cs.getAll();      //获取所有的项目分类信息
      json.put("getAll",list);
      response.getWriter().print(json.toJSONString());
    }
    if("add".equals(flag)) {      //增加操作。
      FenleiBean cb = cs.add(name);
      json.put("aFenlei",cb);
      response.getWriter().print(json.toJSONString());
    }
    if("delete".equals(flag)) {     //删除操作
       boolean result = cs.delete(id);
      System.out.println(flag);
      System.out.println(result);
      if(result){
        json.put("result",result);
        json.put("msg","删除成功");
        response.getWriter().print(json.toJSONString());
        System.out.println(json.toJSONString());
      } else {
        json.put("result",result);
        json.put("msg","删除失败");
        response.getWriter().print(json.toJSONString());
      }
    }
    if("update".equals(flag)) {    //更新信息
      System.out.println(flag);
      String newname = request.getParameter("newname");
      System.out.println("---------------update newname"+newname);
      boolean result = cs.update(newname);
      if(result){
        json.put("result",result);
        json.put("msg","修改成功");
        response.getWriter().print(json.toJSONString());
        System.out.println(json.toJSONString());
      } else {
        json.put("result",result);
        json.put("msg","修改失败");
        response.getWriter().print(json.toJSONString());
      }
    }
  }
}

</pre><pre name="code" class="javascript">