我正在关注this教程。在客户端,在一个简单的html页面中,我未定义来自SignalR的客户端集线器代理;我错过了什么?
此链接正常工作(客户端是同一解决方案中的另一个asp.net mvc项目):
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
My Hub课程:
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):
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:
<!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>
答案 0 :(得分:4)
您需要在服务器上启用CORS支持才能使跨域工作(我还将列出如何启用jsonp)。
启用Cors:
:
app.UseCors(CorsOptions.AllowAll); // You can modify the CorsOptions
启用JSONP:
通过以下方式修改启动文件中的“MapSignalR”:
app.MapSignalR(new HubConfiguration
{
EnableJSONP = true
});
要做到这两点,你可以这样做:
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使其暴露于潜在的安全漏洞。