[英]Can I catch the “can't establish a connection” error for a failed websocket connection?
我需要测试是否建立了与websocket服务器的连接。
这时,我可以连接到服务器,但我希望能够捕获该服务器无法访问的可能性,所以这个问题是关于无法建立websocket连接或超时时该怎么办。
仅使用Firefox中的基本websocket代码,它将在大约20秒内超时并调用我的错误处理程序。 但它也会抛出一个JavaScript错误(至少对我来说使用Firebug)会出现在浏览器中。 然后日志显示:
Firefox can't establish a connection to the server at ws://192.168.0.1/.
到目前为止我尝试过的:
window.timeout
来检查,如果在onopen
处理程序被调用但还是不行,但这并不妨碍JavaScript错误。 在我自己的超时结束时强制关闭websocket,但现在我得到两个JavaScript错误 - 原来的加号:
The connection to ws://192.168.0.1/ was interrupted while the page was loading.
将try {} catch(e) {}
到我的代码中,无论是在连接套接字还是关闭它时 - 都没有变化。
有关如何使websocket错误无法在浏览器中显示的任何想法?
到目前为止我所学到的是:你不能:0(
...因为这是某种特定于浏览器的行为......
console.log
; 0) 用我做的代码然而我摆脱了一些错误消息,也许它会帮助;)
例如:
包装WS的基本类:看看回调!
/**
* Socket Class
*/
Client.Source.Network.Socket.Class = new Class({ implements: [Client.Source.Network.Socket.Interface] },function( Host, Port ){
var Configuration = {
Server: {
Protocol: 'ws',
Host: Host,
Port: Port
},
Event: {
Open: function(){},
Error: function(){},
Message: function(){},
Close: function(){}
}
};
var Socket = null;
/**
* @return {string}
*/
var HostUrl = function() {
return Configuration.Server.Protocol + '://' + Configuration.Server.Host + ':' + Configuration.Server.Port + '/Connection'
};
/**
* @returns {boolean}
*/
var IsSupported = function() {
return "WebSocket" in window;
};
this.Open = function() {
if( IsSupported() ) {
Socket = new WebSocket( HostUrl() );
Socket.onopen = Configuration.Event.Open;
Socket.onerror = Configuration.Event.Error;
Socket.onmessage = Configuration.Event.Message;
Socket.onclose = Configuration.Event.Close;
} else {
}
};
this.Send = function( Text ) {
Socket.send( Text );
};
this.Close = function() {
Socket.close();
};
this.onOpen = function( Callback ) {
Configuration.Event.Open = Callback;
};
this.onError = function( Callback ) {
Configuration.Event.Error = Callback;
};
this.onMessage = function( Callback ) {
Configuration.Event.Message = Callback;
};
this.onClose = function( Callback ) {
Configuration.Event.Close = Callback;
};
});
看看Connect():onError(),onClose()函数
/**
* Network Class
*/
Client.Source.Network.Class = new Class({ implements: [Client.Source.Network.Interface] },function(){
var _Self = this;
var Socket = null;
this.Connect = function( Host, Port ) {
Socket = new Client.Source.Network.Socket.Class( Host, Port );
Socket.onOpen(function(){
_Self.Gui().Create( Client.Module.Client.Gui() );
Client.Module.Chat.Message('Connected', 'green', 11);
Client.Module.Audio.Play( 'Client.Resource.Audio.Chat.UserOnline', 0.2 );
});
Socket.onMessage( Response );
Socket.onError(function(){
Client.Module.Chat.Message('Connection Error', 'red', 11);
});
Socket.onClose(function(){
_Self.Gui().Destroy();
Client.Module.Chat.Message('Disconnected', 'darkred', 11);
Client.Module.Chat.Message('Connecting...', 'orange', 11);
window.setTimeout(function () {
_Self.Connect( Host, Port );
}, 2000);
});
Socket.Open();
};
this.Request = function( Application, Request, Data ) {
Socket.Send( JSON.stringify( { Application: Application, Request: Request, Data: Data } ) );
};
var Response = function( Message ) {
Message = JSON.parse( Message.data );
Library[Message.Application].Execute( Message.Request, Message.Data );
};
var Library = {};
this.Protocol = function( Application, Callback ) {
Library[Application] = Callback;
};
var GuiObject = null;
this.Gui = function Gui() {
if( GuiObject === null ) {
GuiObject = new Client.Source.Network.Gui();
}
return GuiObject;
};
});
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