[英]Can I catch the “can't establish a connection” error for a failed websocket connection?
我需要測試是否建立了與websocket服務器的連接。
這時,我可以連接到服務器,但我希望能夠捕獲該服務器無法訪問的可能性,所以這個問題是關於無法建立websocket連接或超時時該怎么辦。
僅使用Firefox中的基本websocket代碼,它將在大約20秒內超時並調用我的錯誤處理程序。 但它也會拋出一個JavaScript錯誤(至少對我來說使用Firebug)會出現在瀏覽器中。 然后日志顯示:
Firefox can't establish a connection to the server at ws://192.168.0.1/.
到目前為止我嘗試過的:
window.timeout
來檢查,如果在onopen
處理程序被調用但還是不行,但這並不妨礙JavaScript錯誤。 在我自己的超時結束時強制關閉websocket,但現在我得到兩個JavaScript錯誤 - 原來的加號:
The connection to ws://192.168.0.1/ was interrupted while the page was loading.
將try {} catch(e) {}
到我的代碼中,無論是在連接套接字還是關閉它時 - 都沒有變化。
有關如何使websocket錯誤無法在瀏覽器中顯示的任何想法?
到目前為止我所學到的是:你不能:0(
...因為這是某種特定於瀏覽器的行為......
console.log
; 0) 用我做的代碼然而我擺脫了一些錯誤消息,也許它會幫助;)
例如:
包裝WS的基本類:看看回調!
/**
* 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()函數
/**
* 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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