SignalR 在 WebForm 中不起作用答案

【问题标题】：SignalR doesn't work in WebFormSignalR 在 WebForm 中不起作用
【发布时间】：2016-12-11 06:57:24
【问题描述】：

我正在使用 Visual Studio 2015 开发一个 asp.net 网络表单。我是 SignalR 的新手，我正在尝试让演示片在现有站点中工作。当我创建一个 html 页面时，它工作正常：

<!DOCTYPE html>
<html>
<head>
    <title>SignalR Simple Chat</title>
    <style type="text/css">
        .container {
            background-color: #99CCFF;
            border: thick solid #808080;
            padding: 20px;
            margin: 20px;
        }
    </style>
</head>
<body>
    <div class="container">
        <input type="text" id="message" />
        <input type="button" id="sendmessage" value="Send" />
        <input type="hidden" id="displayname" />
        <ul id="discussion"></ul>
    </div>
    <!--Script references. -->
    <!--Reference the jQuery library. -->
    <script src="Scripts/jquery-1.10.2.min.js"></script>
    <!--Reference the SignalR library. -->
    <script src="Scripts/jquery.signalR-2.2.1.min.js"></script>
    <!--Reference the autogenerated SignalR hub script. -->
    <script src="signalr/hubs"></script>
    <!--Add script to update the page and send messages.-->
    <script type="text/javascript">
        $(function () {
            // Declare a proxy to reference the hub.
            var chat = $.connection.ChatHub;
            // Create a function that the hub can call to broadcast messages.
            chat.client.broadcastMessage = function (name, message) {
                // Html encode display name and message.
                var encodedName = $('<div />').text(name).html();
                var encodedMsg = $('<div />').text(message).html();
                // Add the message to the page.
                $('#discussion').append('<li><strong>' + encodedName
                    + '</strong>:&nbsp;&nbsp;' + encodedMsg + '</li>');
            };
            // Get the user name and store it to prepend to messages.
            $('#displayname').val(prompt('Enter your name:', ''));
            // Set initial focus to message input box.
            $('#message').focus();
            // Start the connection.
            $.connection.hub.start().done(function () {
                $('#sendmessage').click(function () {
                    // Call the Send method on the hub.
                    chat.server.send($('#displayname').val(), $('#message').val());
                    // Clear text box and reset focus for next comment.
                    $('#message').val('').focus();
                });
            });
        });
    </script>
</body>
</html>

但是，当我在同一个项目中使用相同的代码但使用 WebForm 时，它会给我一条错误消息：0x800a138f - JavaScript 运行时错误：无法获取未定义或空引用的属性“ChatHub”。我花了一整天的时间试图让 SignalR 运行，但我不知所措。

这是爆炸的代码：

     <%@ Page Title="" Language="vb" AutoEventWireup="false" MasterPageFile="~/MasterPages/Site.Master" CodeBehind="WebForm2.aspx.vb" Inherits="RealtimeReportsWF.WebForm2" %>
<asp:Content ID="Content1" ContentPlaceHolderID="MainContent" runat="server">
    <div class="container">
        <input type="text" id="message" />
        <input type="button" id="sendmessage" value="Send" />
        <input type="hidden" id="displayname" />
        <ul id="discussion"></ul>
    </div>
    <!--Script references. -->
    <!--Reference the jQuery library. -->
    <script src="Scripts/jquery-1.10.2.min.js"></script>
    <!--Reference the SignalR library. -->
    <script src="Scripts/jquery.signalR-2.2.1.min.js"></script>
    <!--Reference the autogenerated SignalR hub script. -->
    <script src="signalr/hubs"></script>
    <!--Add script to update the page and send messages.-->
    <script type="text/javascript">
        $(function () {
            // Declare a proxy to reference the hub.
            var chat = $.connection.ChatHub;
            // Create a function that the hub can call to broadcast messages.
            chat.client.broadcastMessage = function (name, message) {
                // Html encode display name and message.
                var encodedName = $('<div />').text(name).html();
                var encodedMsg = $('<div />').text(message).html();
                // Add the message to the page.
                $('#discussion').append('<li><strong>' + encodedName
                    + '</strong>:&nbsp;&nbsp;' + encodedMsg + '</li>');
            };
            // Get the user name and store it to prepend to messages.
            $('#displayname').val(prompt('Enter your name:', ''));
            // Set initial focus to message input box.
            $('#message').focus();
            // Start the connection.
            $.connection.hub.start().done(function () {
                $('#sendmessage').click(function () {
                    // Call the Send method on the hub.
                    chat.server.send($('#displayname').val(), $('#message').val());
                    // Clear text box and reset focus for next comment.
                    $('#message').val('').focus();
                });
            });
        });
    </script>
</asp:Content>

【问题讨论】：

标签： asp.net vb.net visual-studio-2015 webforms signalr

【解决方案1】：

我睡在上面，不得不记住像 SignalR 这样的框架的黄金法则……它只是 java。然后我意识到我没有在路径中包含 ../ 。有意义，因为在 HTML 版本中它包含在路径中。所以修改代码以包含这个解决了这个问题：

    <!--Script references. -->
    <!--Reference the jQuery library. -->
    <script src="../Scripts/jquery-1.10.2.min.js"></script>
    <!--Reference the SignalR library. -->
    <script src="../Scripts/jquery.signalR-2.2.1.min.js"></script>
    <!--Reference the autogenerated SignalR hub script. -->
    <script src="../signalr/hubs"></script>

【讨论】：