SingleR2 永久连接监听实例2

1.创建服务端监听

    public class TrackerConnection : PersistentConnection
    {
        protected override Task OnReceived(IRequest request, string connectionId, string data)
        {
            return Connection.Broadcast(data);
        }
    }

2.添加路由注册

            //注册服务器端相应路由
            app.MapSignalR<TrackerConnection>("/tracker");

3.客户端JS监听

    <script type="text/javascript">
        //SignalR 客户端
        var connection = $.connection('/tracker');
        connection.logging = true;
        //连接建立
        connection.start(function () {
            startTracking();
        });
        //客户端接收消息
        connection.received(function (data) {
            data = JSON.parse(data);
            var elemID = 'id' + data.id;
            var elem = createElementIfNotExists(elemID);
            $(elem).css({
                left: data.x,
                top:data.y
            }).text(data.id);
        });
        function startTracking() {
            $(document.body).mousemove(function (e) {
                //发送json 对象
                //从当前上下文中获取连接对象
                var data = { x: e.pageX, y: e.pageY, id: connection.id };
                connection.send(data);
            });
        }
        /* Helper functions */
        function createElementIfNotExists(id) {
            var element = $("#" + id);
            if (element.length == 0) {
                element = $("<span class='client' " +
                            "id='" + id + "'></span>");
                var color = getRandomColor();
                element.css({
                    backgroundColor: getRgb(color),
                    color: getInverseRgb(color)
                });
                $("body").append(element).show();
            }
            return element;
        }
        function getRgb(rgb) {
            return "rgb(" + rgb.r + "," + rgb.g + "," + rgb.b + ")";
        }

        function getInverseRgb(rgb) {
            return "rgb(" + (255 - rgb.r) + "," +
                            (255 - rgb.g) + "," + (255 - rgb.b) + ")";
        }

        function getRandomColor() {
            return {
                r: Math.round(Math.random() * 256),
                g: Math.round(Math.random() * 256),
                b: Math.round(Math.random() * 256),
            };
        }
    </script>