Question

我正在玩Coldfusion 10的websockets并进行简单的聊天以进行测试。我已经看过几个聊天，他们有“用户输入...”文本，当其他用户输入时显示。有谁知道如何有效地实现这一点？

Answer 1

创建另一个频道'通知'并在其中发布'用户正在键入'当用户执行'keyDown'和'emptystring'时'keyUp'。

与您聊天时订阅此频道。接收方的这个频道的目标应该是一个内部html可以填充'User is Typing'消息。

<强>伪代码：

<cfwebsocket name="notificationSocket" 
             onmessage="notifyHandler"
             subscribeto="notificationChannel" >

<cfwebsocket name="ChatSocket" 
             onmessage="chatHandler"
             subscribeto="chatChannel" >

<!-- Conversation displayer -->
<div id="messageBoard"></div>

<!-- your text message input area -->
<textarea onKeyDown="sayTyping()" onKeyUp="sayStopped()" id="chatInput"></textarea>
<div id="notifyArea"></div>
<input name="submit" onClick="publishMessage()"></textarea>

<script>

    /*chat Functions*/
    var publishMessage = function(){
        var msg = document.getElementById('chatInput').value;
        mycfwebsocketobject.publish("chatChannel", msg );
    };

    var chatHandler = function(msgObj){
        document.getElementById('messageBoard').innerHTML += ColdFusion.JSON.encode(msgObj);
    };


    /*notifying Functions*/
    var notifyHandler = function(noteObj){
        document.getElementById('notifyArea').innerHTML = ColdFusion.JSON.encode(noteObj);
    };    

    var sayTyping = function(){
        mycfwebsocketobject.publish("notificationchannel","User is Typing..." );
    };
    var sayStopped = function(){
        mycfwebsocketobject.publish("notificationchannel","" );
    };

</script>

另一个增强功能是将div设置为“用户正在输入”，并且您的频道将文本广播为“show”和“noshow”。这基本上是给予显示和隐藏它的类名。减少流量。

方法2 ：使用相同的频道

<cfwebsocket name="ChatSocket" 
             onmessage="chatHandler"
             subscribeto="chatChannel" >

<!-- Conversation displayer -->
<div id="messageBoard"></div>

<!-- your text message input area -->
<textarea onKeyDown="sayTyping()" onKeyUp="sayStopped()" id="chatInput"></textarea>
<div id="notifyArea" class="no">User is typing...</div>
<input name="submit" onClick="publishMessage()"></textarea>

<script>

    /*chat Functions*/
    var publishMessage = function(){
        var msg = document.getElementById('chatInput').value;
        mycfwebsocketobject.publish("chatChannel", msg );
    };

    var chatHandler = function(msgObj){
        var msg = ColdFusion.JSON.encode(msgObj);
        if (msg == '@userTyping@-yes'){
            notifyHandler('yes');
        }
        else if (msg == '@userTyping@-no'){
            notifyHandler('no');
        }
        else {
            document.getElementById('messageBoard').innerHTML += msg;
        }
    };


    /*notifying Functions*/
    var notifyHandler = function(action){

        document.getElementById('notifyArea').className = action;

        /*call the notify handler with off to stop showing the user is typing message
        after a certain interval of time. This is to avoid someone believing that 
        partner is still typing even when the connection is lost*/

        if(action == 'on'){
            setTimeout(function(){notifyHandler('no')},250);
        }
    };    

    var sayTyping = function(){
        mycfwebsocketobject.publish("chatChannel","@userTyping@-yes" );
    };
    var sayStopped = function(){
        mycfwebsocketobject.publish("chatChannel","@userTyping@-no" );
    };

</script>
<style>
.yes { display:block;}
.no { display:none;}
</style>

人们总是可以通过键入“@ userTyping @ -yes”或“@ userTyping @ -no”来欺骗此代码。但正如我所说，这只是一个POC。此外，对于你提到的超时，keyUp无论如何都要处理它。但您也可以通过setTimeout（）调用notifyHandler（），如上所示。

Answer 2

评论内部是关于如何过滤一对一消息的问题。以下是实现此目的的一些示例代码。

使用js函数订阅用户并传入一些标头值，而不是使用subscribeTo属性。然后，可以使用selector

将这些标头用作发布呼叫的过滤器

示例：

<cfwebsocket name="ChatSocket" onOpen="openHandler" onMessage="msgHandler" onError="errHandler">

<script>
    function openHandler(){
        //Subscribe to the channel, pass in headers for filtering later
        ChatSocket.subscribe('chatChannel',{name: '#Session.Auth.FirstName#', UserID: '#Session.Auth.UserID#', AccountID: '#Session.Auth.AccountID#' });
    }

    function publish(txt, userID){
        var msg = {
            AccountID: "#Session.Auth.AccountID#",
            publisher: '#Session.Auth.UserID#', 
            id: userID,
            message: converthtml(txt)
        };
        //When including headers, the "selector" is where you will filter who it goes to.
        var headers = {
            AccountID: "#Session.Auth.AccountID#",
            publisher: '#Session.Auth.UserID#', 
            id: userID,
            selector: "UserID eq '"+userID+"' and AccountID eq '#Session.Auth.AccountID#'"
        };
        ChatSocket.publish('chatChannel',msg, headers);

    }

    function msgHandler(message){
        console.log(message);
    }

    function errHandler(err){
        console.log(err);
    }
</script>

Coldfusion Websockets“用户输入...”功能

2 个答案: