javascript SignalR 调用方法：必须先启动连接，然后才能发送数据
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/17445306/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
SignalR invoke method: connection must be started before data can be sent
提问by Youngjae
There are lots of 'connection must be started before data can be sent' issues in here and GitHub, but I hardly find hub related problems.
这里和 GitHub 中有很多“在发送数据之前必须启动连接”的问题，但我几乎找不到与集线器相关的问题。
$(function () {
// Declare a proxy to reference the hub.
var connection = $.hubConnection('http://www.website.net/');
var chat = connection.createHubProxy('MyHub');
// Start the connection.
$.connection.hub.start().done(function () {
console.log('Connect! connection Id=' + $.connection.hub.id);
$('#sendmessage').click(function () {
chat.invoke('method1','0000').done(function () {
console.log ('Invocation of method1 succeeded');
}).fail(function (error) {
console.log('Invocation of method1 failed. Error: ' + error);
});
});
})
.fail(function(){ console.log('Could not Connect!'); });
});
The above code gives to execute a method when user clicks the button. I can check the method works with my WPF .NET app.
上面的代码给出了当用户点击按钮时执行一个方法。我可以检查该方法是否适用于我的 WPF .NET 应用程序。
I can get Connection Id successfully, but when I click the button it says 'SignalR invoke method: connection must be started before data can be sent. Call .start() before .send()' error.
我可以成功获取连接 ID，但是当我单击按钮时，它显示“SignalR 调用方法：必须在发送数据之前启动连接。在 .send()' 错误之前调用 .start()。
What did I wrong?
我做错了什么？
回答by Youngjae
Read tutorialcarefully and it works now.
仔细阅读教程，现在可以使用了。
$(function () {
// Declare a proxy to reference the hub.
var connection = $.hubConnection('http://www.website.net/');
var chat = connection.createHubProxy('MyHub');
connection.start().done(function() {
console.log('Now connected, connection ID=' + connection.id);
// Wire up Send button to call sendmessage on the server.
$('#sendmessage').click(function () {
chat.invoke('method1', '0000');
});
})
.fail(function(){ console.log('Could not connect'); });;
});
