jquery ajax如何将后台数据返回给前台表格实例代码详解

程序员文章站 2022-03-17 10:31:32

...

实现过程是这样的：前台通过jquery的ajax调用一般处理程序(Handler),获取表格需要显示的信息，然后转换成json格式返回给前台，前台获取到数据后循环构建表格的行，最好把行附加到表里。

目标：

　　a 熟悉简单JQuery Ajax的使用

　　b 了解如何构造基本的Json格式的数据（构建Json也可以通过第三方的dll）

　　c 熟悉下handler的基本用法

前台代码

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="DialogAjax.aspx.cs" Inherits="JQueryTest_DialogAjax" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
  <title></title>
  <link href="../JQueryUi/jquery-ui-1.8.5.custom.css" rel="stylesheet" type="text/css" />
  <script src="../JQueryUi/jquery-1.4.2.min.js" type="text/javascript"></script>
  <script src="../JQueryUi/jquery-ui-1.8.5.custom.min.js" type="text/javascript"></script>
  <style type="text/css">
    #pTb
    {
      width:800px;
      border:1px solid #aaa;
      margin:0 auto;
    }
    .even{background:#CCCCCC;}
    .odd{background:#FFFFFF;}
  </style>
  <script type="text/javascript">
    //获取发布模块类型
    function getModuleInfo() {
      $.ajax({
        type: "GET",
        dataType: "json",
        url: "../Handler/TestHandler.ashx?Method=GetModuleInfo",
        //data: { id: id, name: name },
        success: function(json) {
          var typeData = json.Module;
          $.each(typeData, function(i, n) {
            var tbBody = ""
            var trColor;
            if (i % 2 == 0) {
              trColor = "even";
            }
            else {
              trColor = "odd";
            }
            tbBody += "<tr class='" + trColor + "'><td>" + n.ModuleNum + "</td>" + "<td>" + n.ModuleName + "</td>" + "<td>" + n.ModuleDes + "</td></tr>";
            $("#myTb").append(tbBody);
          });
        },
        error: function(json) {
          alert("加载失败");
        }
      });
    }
    $(function() {
      getModuleInfo();
    });
  </script>
</head>
<body>
  <form id="form1" runat="server">
  <p id="pTb">
    <table id="myTb" style=" width:100%">
    </table>
  </p>
  </form>
</body>
</html>

Handler代码

<%@ WebHandler Language="C#" Class="TestHandler" %>
using System;
using System.Web;
using System.Collections.Generic;
using System.Text;
using DataDAL;
using DataEnity;
public class TestHandler : IHttpHandler {
  HttpRequest Request;
  HttpResponse Response;
  public void ProcessRequest (HttpContext context) {
    //不让浏览器缓存
    context.Response.Buffer = true;
    context.Response.ExpiresAbsolute = DateTime.Now.AddDays(-1);
    context.Response.AddHeader("pragma", "no-cache");
    context.Response.AddHeader("cache-control", "");
    context.Response.CacheControl = "no-cache";
    context.Response.ContentType = "text/plain";
    Request = context.Request;
    Response = context.Response;
    string method = Request["Method"].ToString();
    System.Reflection.MethodInfo methodInfo = this.GetType().GetMethod(method);
    methodInfo.Invoke(this, null);
  }
  public void GetModuleInfo()
  {
    StringBuilder sb = new StringBuilder();
    string jsonData = string.Empty;
    List<Module> lsModule = ModuleDAL.GetModuleList();
    sb.Append("{\"Module\":[");
    for (int i = 0; i < lsModule.Count; i++)
    {
      jsonData = "{\"ModuleNum\":" + "\"" + lsModule[i].ModuleNum + "\"" + ",\"ModuleName\":" + "\"" + lsModule[i].ModuleName + "\"" + ",\"ModuleDes\":" + "\"" + lsModule[i].ModuleDes + "\"" + "},";
      sb.Append(jsonData);
    }
    if (lsModule.Count > 0)
      sb = sb.Remove(sb.Length - 1, 1);
    sb.Append("]}");
    Response.Write(sb);
  }
  public bool IsReusable
  {
    get {
      return false;
    }
  }
}

以上就是jquery ajax如何将后台数据返回给前台表格实例代码详解的详细内容，更多请关注其它相关文章！