目的:練習使用json.html和json.aspx發出ajax請求，並使用json.ashx(沒有畫面的api)返回json物件格式
1.json.html語法
<!DOCTYPE html>
<head >
<title>JSON</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
</head>
<body>
<H5>Hwllo World</H5>
<script>
$.ajax({
url: "json.ashx",
data: {"id":"0125","name":"Tina"},
type: "POST",
dataType: "json",
success: function(returnData){
console.log(returnData);
},
error: function(xhr, ajaxOptions, thrownError){
console.log(xhr.status);
console.log(thrownError);
}
});
</script>
</body>
</html>
$.ajax各屬性代表意思
(1).請求ashx檔案的時候 要把contentType去掉，還有就是
data 格式為 {”key”,”value”};切記 不要再 大括號外面加雙引號，這樣就會在ashx頁面取不到資料而失敗。
(2).
contentType
contentType是網頁要送到Server的資料型態，若沒指定則預設為'application/x-www-form-urlencoded; charset=UTF-8'
dataType
dataType是網頁預期從Server接收的資料型態，若沒指定則jQuery會根據response的MIME type來推定為xml, json, script, html, text。
2.json.aspx語法code behind要有json.aspx.cs就不放上
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Template.aspx.cs" Inherits="Template" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head >
<title>Ch2</title>
<title>Bootstrap Navigation Bar</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
</head>
<body >
<h1>This is Empty</h1>
<form runat="server">
</form>
<script>
$.ajax({
url: "json.ashx",
data: {"id":"0125","name":"Tina"},
type: "POST",
dataType: "json",
success: function(returnData){
console.log(returnData);
},
error: function(xhr, ajaxOptions, thrownError){
console.log(xhr.status);
console.log(thrownError);
}
});
</script>
</body>
</html>
3.調用json.ashx的API
<%@ WebHandler Language = "C#" Class = "ResponseOds" %> using System; using System.Web; using System.Collections.Generic; using System.IO; using System.Web.Script.Serialization; using Newtonsoft.Json; public class ResponseOds : IHttpHandler { public void ProcessRequest (HttpContext context) { string id=context.Request["id"]; //接到前端傳來值 if(id=="0125") //判斷是0125的值，在將相對應要回傳值丟到前台 { List<Student> lstStuModel = new List<Student>() { new Student(){ID=1,Name="張飛",Age=250,Sex="男"}, new Student(){ID=2,Name="潘金蓮",Age=300,Sex="女"} }; //Newtonsoft.Json序列化 string jsonData = JsonConvert.SerializeObject(lstStuModel); context.Response.ContentType = "application/json"; //回傳json格式 context.Response.Charset = "utf-8"; context.Response.Write(jsonData); } } public bool IsReusable { get { return false; } } class Student { public int ID { get; set; } public string Name { get; set; } public int Age { get; set; } public string Sex { get; set; } }參考資料 (1).(2).(3).
