【发布时间】：2018-02-12 05:15:37
【问题描述】：
我尝试在我现有的 MVC 项目和视图中的代码中实现 Signalr 通知，如下所示
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>@ViewBag.Title - My ASP.NET Application</title>
@Styles.Render("~/Content/css")
@Scripts.Render("~/bundles/modernizr")
</head>
<body>
<div class="navbar navbar-inverse navbar-fixed-top">
<div class="container">
<div class="navbar-header">
<span class="noti glyphicon glyphicon-bell"><span class="count"> </span></span>
<div class="noti-content">
<div class="noti-top-arrow"></div>
<ul id="notiContent"></ul>
</div>
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
@Html.ActionLink("Application name", "Index", "Home", new { area = "" }, new { @class = "navbar-brand" })
</div>
<div class="navbar-collapse collapse">
<ul class="nav navbar-nav">
<li>@Html.ActionLink("Home", "Index", "Home")</li>
<li>@Html.ActionLink("About", "About", "Home")</li>
<li>@Html.ActionLink("Contact", "Contact", "Home")</li>
</ul>
@Html.Partial("_LoginPartial")
</div>
</div>
</div>
<div class="container body-content">
@RenderBody()
<hr />
<footer>
<p>© @DateTime.Now.Year - My ASP.NET Application</p>
</footer>
</div>
@* Add Jquery Library *@
<script src="~/Scripts/jquery-2.2.3.min.js"></script>
<script src="~/Scripts/jquery.signalR-2.2.0.min.js"></script>
<script src="/signalr/hubs"></script>
<script src="~/Scripts/bootstrap.min.js"></script>
@* Add css *@
<link href="~/Content/bootstrap.min.css" rel="stylesheet" />
<style type="text/css">
/*Added css for design notification area, you can design by your self*/
/* COPY css content from youtube video description*/
</style>
@* Add jquery code for Get Notification & setup signalr *@
<script type="text/javascript">
$(function () {
// Click on notification icon for show notification
$('span.noti').click(function (e) {
e.stopPropagation();
$('.noti-content').show();
var count = 0;
count = parseInt($('span.count').html()) || 0;
//only load notification if not already loaded
if (count > 0) {
updateNotification();
}
$('span.count', this).html(' ');
})
// hide notifications
$('html').click(function () {
$('.noti-content').hide();
})
// update notification
function updateNotification() {
$('#notiContent').empty();
$('#notiContent').append($('<li>Loading...</li>'));
$.ajax({
type: 'GET',
url: '/home/GetNotificationContacts',
success: function (response) {
$('#notiContent').empty();
if (response.length == 0) {
$('#notiContent').append($('<li>No data available</li>'));
}
$.each(response, function (index, value) {
$('#notiContent').append($('<li>New contact : ' + value.ContactName + ' (' + value.ContactNo + ') added</li>'));
});
},
error: function (error) {
console.log(error);
}
})
}
// update notification count
function updateNotificationCount() {
var count = 0;
count = parseInt($('span.count').html()) || 0;
count++;
$('span.count').html(count);
}
// signalr js code for start hub and send receive notification
var notificationHub = $.connection.notificationHub;
$.connection.hub.start().done(function () {
console.log('Notification hub started');
});
//signalr method for push server message to client
notificationHub.client.notify = function (message) {
if (message && message.toLowerCase() == "added") {
updateNotificationCount();
}
}
})
</script>
@Scripts.Render("~/bundles/jquery")
@Scripts.Render("~/bundles/bootstrap")
@RenderSection("scripts", required: false)
</body>
</html>
排队
// signalr js code for start hub and send receive notification
var notificationHub = $.connection.notificationHub;
$.connection.hub.start().done(function () {
console.log('Notification hub started');
});
$.connection 没有定义
以及在运行应用程序时
Uncaught TypeError: Cannot read property 'notificationHub' of undefined
at HTMLDocument.<anonymous> (Login:219)
at i (jquery-2.2.3.min.js:2)
at Object.fireWith [as resolveWith] (jquery-2.2.3.min.js:2)
at Function.ready (jquery-2.2.3.min.js:2)
at HTMLDocument.J (jquery-2.2.3.min.js:2)
它将错误行显示为 var notificationHub = $.connection.notificationHub;
但是当我尝试在一个新项目中实现它时，它在删除一些额外的脚本引用后工作，但在这个项目中它没有工作
这是我遵循的示例 http://www.dotnetawesome.com/2016/05/push-notification-system-with-signalr.html
这适用于空 MVC 项目，但在尝试对现有项目实施相同的项目时会出现此问题。
// 用于启动集线器和发送接收通知的信号器 js 代码 var notificationHub = $.connection.notificationHub;
$.connection 没有应该来自 jquery.signalR-2.2.0.js 的定义
解决这个问题的任何想法
【问题讨论】：
标签： javascript jquery asp.net-mvc asp.net-mvc-5 signalr