使用ASP.NET AJAX中的PageMethods从JS调用ServerSide函数

本文介绍了使用ASP.NET AJAX中的PageMethods从JS调用ServerSide函数的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

当我执行此代码(在.js内部)时:

When I execute this code (inside .js) :

jQuery.fn.stickyNotes.createNote = function () {
        var pos_x = 0;
        var pos_y = 0;
        var note_id = jQuery.fn.stickyNotes.notes.length + 1; 
  PageMethods.saveNote(note_id); // remote method

我需要在MSSQL数据库中保存note_id值.

我将其放在default.aspx上(在< body>内部，我不确定我是否正确)，以启用AJAX:

I need to save note_id value inside MSSQL database.

I put this on default.aspx (inside <body> I''m not sure if I''m right), to enable AJAX:

<pre lang="xml"><form id="form2" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
</form>

以及default.aspx.cs
中的方法

and for a method in default.aspx.cs

[System.Web.Services.WebMethod]
    public static string saveNote(int note_id)
    {
if (note_id == null || text.Length == 0)
            return String.Empty;
        SqlConnection conn = null;
        try
        {
            string connection = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
            conn = new SqlConnection(connection);
            string sql = "INSERT INTO .....";
            SqlCommand cmd = new SqlCommand(sql, conn);
            cmd.Parameters.AddWithValue("ID_Note", note_id);
            // ...
            conn.Open();
            string contNm = Convert.ToString(cmd.ExecuteScalar());
            return contNm;

我在< head>
上定义了这个< script type ="text/javascript" src ="script/jquery.stickynotes.js"></script>

到目前为止，我有两个重要的问题:

-我仍然没有编译代码，因为我得到了以下错误:runat = server有两种形式(我又一个两个登录名).我怎么解决这个问题?我可以将脚本管理器放在该表单中吗?

-如果我这样做，我的AJAX无效.当我单击添加注释"时，什么也没有发生……因此它可以正常工作(它会创建一个新的注释/元素).如果我对此行发表评论PageMethods.saveNote(note_id);它又可以工作了...看来我的JS停止工作了.你能帮我吗?

预先感谢.

I have this defined on <head>
<script type="text/javascript" src="script/jquery.stickynotes.js"></script>

By now I have two importante questions:

- I still didnt compiled the code because I get the error that I have two forms with runat=server (I another one two login). How can I solve this problem? Can I put the script manager inside that form?

- If I do that my AJAX dont work. When I click add note nothing happens... previosly it works (it creates a new note/element). If I comment this line PageMethods.saveNote(note_id); it works again... It looks like that my JS stops working. Can you help me please ?

Thanks in advance.

推荐答案

<%@ Page Language="C#" %>
<script runat="server">
    [System.Web.Services.WebMethod]
    public static string GetHello()
    {
        return "Hello";
    }
</script>
<html>
<head runat="server">
    <title>Test PageMethods</title>
</head>
<body>
    <script type="text/javascript">
        function DoIt() {
            PageMethods.GetHello(function(result) {
                alert(result);
            });
        }
    </script>
    <form id="form1" runat="server">
        <asp:ScriptManager runat="server" EnablePageMethods="true" />
        <input type="button" onclick="DoIt();" value="Do Stuff" />
    </form>
    <form id="form2"></form>
</body>
</html>

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