SignalR客户端集线器代理未定义 [英] SignalR Client Hub Proxy is Undefined
问题描述
我正在关注本教程.在客户端，在一个简单的html页面中，我从SignalR获得了未定义的客户端中心代理；我想念什么?
I was following this tutorial. On client side, in a simple html page, I get undefined for the client hub proxy from SignalR; What am I missing?
此链接正常工作(客户端是同一解决方案下的另一个asp.net mvc项目):
This links work properly (client is another asp.net mvc project at the same solution):
http://localhost:28538/Scripts/jquery.signalR-2.0.0.min.js
http://localhost:28538/Scripts/jquery-1.8.2.min.js
http://127.0.0.1:9077/signalr/hubs
http://127.0.0.1:9077/signalr/js
我的Hub类:
class AlohaHub : Hub
{
public void Send(string name, string message)
{
Clients.All.addMessage(name, message);
}
}
启动类(将传递给WebApp.Start):
class Startup
{
public void Configuration(IAppBuilder app)
{
app.MapSignalR();
}
}
应用程序的主要部分(Windows服务，但这无关紧要):
The main part of the app (a windows service, but that's irrelevant):
class MyAppSvc : WinSvc.ISvc
{
IDisposable _app;
string _url = "http://127.0.0.1:9077";
public void OnShutdown()
{
_app.Dispose();
}
public void OnStart(string[] args)
{
_app = Microsoft.Owin.Hosting.WebApp.Start<MyApp.SigR.Startup>(_url);
}
public void OnStop()
{
_app.Dispose();
}
}
实际的html页面；客户:
The actual html page; the client:
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>SigR Sample</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 src="Scripts/jquery-1.8.2.min.js" type="text/javascript"></script>
<script src="Scripts/jquery.signalR-2.0.0.min.js" type="text/javascript"></script>
<script src="http://127.0.0.1:9077/signalr/hubs" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
//Set the hubs URL for the connection
$.connection.hub.url = "http://127.0.0.1:9077/signalr";
$.connection.hub.logging = true;
// Declare a proxy to reference the hub.
var chat = $.connection.alohaHub;
alert(chat);
// Create a function that the hub can call to broadcast messages.
chat.client.addMessage = 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>: ' + 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>
推荐答案
您需要在服务器上启用CORS支持，以便跨域工作(我还将列出如何启用jsonp).
You need to enable CORS support on your server for cross domain to work (I'll also list how to enable jsonp).
要启用Cors:
- 通过nuget(Microsoft.Owin.Cors)安装Microsoft ASP.NET跨域支持
- 将此添加到您的启动文件中(在调用地图信号器之前):
:
app.UseCors(CorsOptions.AllowAll); // You can modify the CorsOptions
启用JSONP:
通过以下方法在启动文件中修改"MapSignalR":
Modify your "MapSignalR" in your startup file via:
app.MapSignalR(new HubConfiguration
{
EnableJSONP = true
});
您可以同时做这两个事情:
To do both together you can do:
app.UseCors(CorsOptions.AllowAll)
.MapSignalR(new HubConfiguration
{
EnableJSONP = true
});
请记住，在SignalR服务器上启用这些跨域功能会将其暴露于潜在的安全漏洞中.
Keep in mind enabling these cross domain features on your SignalR server exposes it to potential security vulnerabilities.
这篇关于SignalR客户端集线器代理未定义的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
