JavaScript native xmlHttp and jquery's ajax method json data format example

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JavaScript native xmlHttp and jquery's ajax method json data format example_javascript skills

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May 16, 2016 pm 03:27 PM

javascript version of ajax send request

(1) Create an XMLHttpRequest object. This object is the core of the ajax request and the information carrier of the ajax request and response. Different browsers have different creation methods

(2), request path

(3). Use the open method to bind and send a request

(4). Use the send() method to send a request

(5), Get the string returned by the server xmlhttpRequest.responseText;

(6), get the value returned by the server and store it in the form of xml object xmlhttpRequest.responseXML;

(7) Use W3C DOM node tree methods and attributes to inspect and parse the XML document object.

Preface:

Recently, as the project was launched and implemented, I had a little free time. In my spare time, I accidentally discovered what I had written before about the javascript native xmlHttp ajax method and the later jquery plug-in ajax method, so I made some summaries. Due to time reasons, it was not included in all Test on browsers. The currently tested ones are IE8, 9, 10, Google Chrome, Mozilla Firefox, and Opera. If you find any problems during the verification test, please give me feedback in time. Thank you all.

Back to business, let’s go directly to the code:

Front-end code

<!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>
  <title>Ajax练习</title>
  <script src="/Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
  <style type="text/css">
  label{width:50px;display:inline-block;}
  </style>
</head>
<body>
<div id="contentDiv">
  <h2 id="html-表单元素">html5表单元素</h2>
  <label>E-mail</label><input type="email" name="UserEmail" id="UserEmail" value="251608027@qq.com" /><br />
  <label>URL:</label><input type="url" name="UserURL" id="UserURL" value="http://www.baidu.com" /><br />
  <label>Number:</label><input type="number" name="UserNumber" id="UserNumber" min="1" max="100" value="87" /><br />
  <label>Range:</label><input type="range" name="UserRange" min="1" max="100" value="78" /><br />
  <label>Date:</label><input type="date" name="UserDate" id="UserDate" value="2015-12-01" /><br />
  <label>Search:</label><input type="search" name="UserSearch" id="UserSearch" value="search" /><br />
  <label id="lblMsg" style="color:Red; width:100%;"></label><br />
  <input type="button" id="btnXmlHttp" value="提 交" onclick="return xmlPost();" />
  <input type="button" id="btnAjax" value="Ajax提 交" onclick="return Ajax();" />
  <input type="button" id="btnPost" value="Post提 交" onclick="return Post();" />
  <input type="button" id="btnGet" value="Get提 交" onclick="return Get();" />
  <input type="button" id="btnGetJSON" value="GetJSON提 交" onclick="return GetJSON();" />
  <input type="button" id="btnCustom" value="Custom提 交" onclick="return Custom();" />
  <br /><label id="lblAD" style="color:Red; width:100%;">.NET技术交流群：70895254，欢迎大家</label>
  <script type="text/javascript">
    //基础数据
    var jsonData = {
      UserEmail: $("#UserEmail").val(),
      UserURL: $("#UserURL").val(),
      UserNumber: $("#UserNumber").val(),
      UserRange: $("#UserRange").val(),
      UserDate: $("#UserDate").val(),
      UserSearch: $("#UserSearch").val()
    };
    //统一返回结果处理
    function Data(data, type) {
      if (data && data.length > 0) {
        var lblMsg = "";
        for (i = 0; i < data.length; i++) {
          for (var j in data[i]) {
            lblMsg += j + "：" + data[i][j];
            if (j != "Name" && j != "UserSearch") { lblMsg += "，" }
          }
          if (i != data.length) { lblMsg += "；"; }
        }
        $("#lblMsg").html(type + "请求成功，返回结果：" + lblMsg);
      }
    }
  </script>
  <script type="text/javascript">
    //javascript 原生ajax方法
    function createXMLHttp() {
      var XmlHttp;
      if (window.ActiveXObject) {
        var arr = ["MSXML2.XMLHttp.6.0", "MSXML2.XMLHttp.5.0", "MSXML2.XMLHttp.4.0", "MSXML2.XMLHttp.3.0", "MSXML2.XMLHttp", "Microsoft.XMLHttp"];
        for (var i = 0; i < arr.length; i++) {
          try {
            XmlHttp = new ActiveXObject(arr[i]);
            return XmlHttp;
          }
          catch (error) { }
        }
      }
      else {
        try {
          XmlHttp = new XMLHttpRequest();
          return XmlHttp;
        }
        catch (otherError) { }
      }
    }    
    function xmlPost() {
      var xmlHttp = createXMLHttp();
      var queryStr = "Ajax_Type=Email&jsonData=" + JSON.stringify(jsonData);
      var url = "/Handler/AjaxHandlerHelper.ashx&#63;no.=" + Math.random();
      xmlHttp.open('Post', url, true);
      xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
      xmlHttp.send(queryStr);
      xmlHttp.onreadystatechange = function () {
        if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
          var data = eval(xmlHttp.responseText);
          Data(data, "javascript原生xmlHttp");
        }
      }
    }
  </script>
  <script type="text/javascript">
    //jquery $.ajax方法
    function Ajax() {
      $.ajax({
        url: "/Handler/AjaxHandlerHelper.ashx&#63;no.=" + Math.random(),
        type: "Post",
        async: false,
        data: {
          Ajax_Type: "Email",
          jsonData: JSON.stringify(jsonData)
        },
        dataType: "json",
        beforeSend: function () { //发送请求前 
          $("#btnPost").attr('disabled', "true");
        },
        complete: function () { //发送请求完成后
          $("#btnPost").removeAttr("disabled");
        },
        error: function (XMLHttpRequest, textStatus, errorThrown) {
          alert("error!" + errorThrown);
          //alert("请求错误，请重试！");
        },
        success: function (data) {
          Data(data, "Jquery $.ajax");
        }
      });
    }
    //jquery $.post方法
    function Post() {
      $.post("/Handler/AjaxHandlerHelper.ashx&#63;no.=" + Math.random(),
        {
          Ajax_Type: "Email",
          jsonData: JSON.stringify(jsonData)
        },
        function (data) {
          Data(data, "Jquery $.post");
        }
      );
      }
    //jquery $.getJSON方法
    function GetJSON() {
      $.getJSON("/Handler/AjaxHandlerHelper.ashx&#63;no.=" + Math.random(),
        {
          Ajax_Type: "Email",
          jsonData: JSON.stringify(jsonData)
        },
        function (data) {
          Data(data, "Jquery $.getJSON");
        }
      );
      }
    //jquery $.get方法
    function Get() {
      $.get("/Handler/AjaxHandlerHelper.ashx&#63;no.=" + Math.random(),
        {
          Ajax_Type: "Email",
          jsonData: JSON.stringify(jsonData)
        },
        function (data) {
          Data(data, "Jquery $.get");
        }
      );
    }
  </script>
  <script type="text/javascript">
    //javascript原生脚本自定义jquery $.ajax方法
    var CustomAjax = function (custom) {
      // 初始化
      var type = custom.type; //type参数,可选      
      var url = custom.url; //url参数，必填      
      var data = custom.data; //data参数可选，只有在post请求时需要        
      var dataType = custom.dataType; //datatype参数可选      
      var success = custom.success; //回调函数可选
      var beforeSend = custom.beforeSend; //回调函数可选
      var complete = custom.complete; //回调函数可选
      var error = custom.error; //回调函数可选
      if (type == null) {//type参数可选，默认为get
        type = "get";
      }
      if (dataType == null) {//dataType参数可选，默认为text
        dataType = "text";
      }
      var xmlHttp = createXMLHttp(); // 创建ajax引擎对象
      xmlHttp.open(type, url, true); // 打开
      // 发送
      if (type == "GET" || type == "get" || type == "Get") {//大小写
        xmlHttp.send(null);
      }
      else if (type == "POST" || type == "post" || type == "Post") {
        xmlHttp.setRequestHeader("content-type", "application/x-www-form-urlencoded");
        xmlHttp.send(data);
      }
      xmlHttp.onreadystatechange = function () {
        if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
          if (dataType == "text" || dataType == "TEXT") {
            if (success != null) {
              //普通文本
              success(xmlHttp.responseText);
            }
          } else if (dataType == "xml" || dataType == "XML") {
            if (success != null) {
              //接收xml文档  
              success(xmlHttp.responseXML);
            }
          } else if (dataType == "json" || dataType == "JSON") {
            if (success != null) {
              //将json字符串转换为js对象 
              success(eval("(" + xmlHttp.responseText + ")"));
            }
          }
        }
      };
    };
    //自定义方法
    function Custom() {
      CustomAjax({
        type: "Post",
        url: "/Handler/AjaxHandlerHelper.ashx&#63;no.=" + Math.random(),
        data: "Ajax_Type=Email&jsonData=" + JSON.stringify(jsonData),
        dataType: "json",
        success: function (data) {
          Data(data, "Custom自定义");
        }
      });
    }
  </script>
</div>
</body>
</html>

.ashx backend code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Script.Serialization;
using System.Runtime.Serialization.Json;
using System.IO;
using System.Text;
namespace WebHTML5.Handler
{
  /// <summary>
  /// AjaxHandlerHelper 的摘要说明
  /// </summary>
  public class AjaxHandlerHelper : IHttpHandler
  {
    public void ProcessRequest(HttpContext context)
    {
      context.Response.ContentType = "application/json";
      //context.Response.Charset = "utf-8";
      var Ajax_Type = context.Request.QueryString["Ajax_Type"] == null &#63;
        context.Request.Form["Ajax_Type"] : context.Request.QueryString["Ajax_Type"];
      switch (Ajax_Type) 
      {
        case "Email":
          context.Response.Write(PostEmail(context));
          break;
        default:
          context.Response.Write("[{\"Age\":28,\"Name\":\"张鹏飞\"}]");
          break;
      }
    }
    public static string PostEmail(HttpContext context)
    {
      string semail = string.Empty;
      if (context.Request.HttpMethod == "GET")
      {
        semail = "[" + context.Request.QueryString["jsonData"] + "]";
      }
      else
      {
        semail = "[" + context.Request.Form["jsonData"] + "]";
      }
      return semail;
    }
    /// <summary>
    /// JSON序列化
    /// </summary>
    public static string JsonSerializer<T>(T t)
    {
      DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
      MemoryStream ms = new MemoryStream();
      ser.WriteObject(ms, t);
      string jsonString = Encoding.UTF8.GetString(ms.ToArray());
      ms.Close();
      return jsonString;
    }
    /// <summary>
    /// JSON反序列化
    /// </summary>
    public static T JsonDeserialize<T>(string jsonString)
    {
      DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
      MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
      T obj = (T)ser.ReadObject(ms);
      return obj;
    }
    public bool IsReusable
    {
      get
      {
        return false;
      }
    }
  }
}

Jquery method extension

About Jquery method extension, you can google or Baidu by yourself;

Conclusion

Let me explain the situation: the value problem of the html5 range tag that appeared in the case is wrong. Don’t worry about it. You can google or Baidu on how to get the value of the range tag by yourself;

Statement

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