Better alert message if no WebSockets are detected.

IPython/frontend/html/notebook/static/js/kernel.js

@@ -1,156 +1,156
 //----------------------------------------------------------------------------
 //  Copyright (C) 2008-2011  The IPython Development Team
 //
 //  Distributed under the terms of the BSD License.  The full license is in
 //  the file COPYING, distributed as part of this software.
 //----------------------------------------------------------------------------
 
 //============================================================================
 // Kernel
 //============================================================================
 
 var IPython = (function (IPython) {
 
     var utils = IPython.utils;
 
     var Kernel = function () {
         this.kernel_id = null;
         this.base_url = "/kernels";
         this.kernel_url = null;
         this.shell_channel = null;
         this.iopub_channel = null;
         this.running = false;
         if (typeof(WebSocket) !== 'undefined') {
             this.WebSocket = WebSocket
         } else if (typeof(MozWebSocket) !== 'undefined') {
             this.WebSocket = MozWebSocket
         } else {
-            alert('Your browser does not have WebSocket support, please try Chrome, Safari or Firefox 6');
+            alert('Your browser does not have WebSocket support, please try Chrome, Safari or Firefox 6. Firefox 4 and 5 are also supported by you have to enable WebSockets in about:config.');
         };
     };
 
 
     Kernel.prototype.get_msg = function (msg_type, content) {
         var msg = {
             header : {
                 msg_id : utils.uuid(),
                 username : "username",
                 session: this.session_id,
                 msg_type : msg_type
             },
             content : content,
             parent_header : {}
         };
         return msg;
     }
 
     Kernel.prototype.start = function (notebook_id, callback) {
         var that = this;
         if (!this.running) {
             var qs = $.param({notebook:notebook_id});
             $.post(this.base_url + '?' + qs,
                 function (kernel_id) {
                     that._handle_start_kernel(kernel_id, callback);
                 }, 
                 'json'
             );
         };
     };
 
 
     Kernel.prototype.restart = function (callback) {
         IPython.kernel_status_widget.status_restarting();
         var url = this.kernel_url + "/restart";
         var that = this;
         if (this.running) {
             this.stop_channels();
             $.post(url,
                 function (kernel_id) {
                     that._handle_start_kernel(kernel_id, callback);
                 },
                 'json'
             );
         };
     };
 
 
     Kernel.prototype._handle_start_kernel = function (json, callback) {
         this.running = true;
         this.kernel_id = json.kernel_id;
         this.ws_url = json.ws_url;
         this.kernel_url = this.base_url + "/" + this.kernel_id;
         this.start_channels();
         callback();
         IPython.kernel_status_widget.status_idle();
     };
 
 
     Kernel.prototype.start_channels = function () {
         this.stop_channels();
         var ws_url = this.ws_url + this.kernel_url;
         console.log("Starting WS:", ws_url);
         this.shell_channel = new this.WebSocket(ws_url + "/shell");
         this.iopub_channel = new this.WebSocket(ws_url + "/iopub");
     };
 
 
     Kernel.prototype.stop_channels = function () {
         if (this.shell_channel !== null) {
             this.shell_channel.close();
             this.shell_channel = null;
         };
         if (this.iopub_channel !== null) {
             this.iopub_channel.close();
             this.iopub_channel = null;
         };
     };
 
     Kernel.prototype.execute = function (code) {
         var content = {
             code : code,
             silent : false,
             user_variables : [],
             user_expressions : {}
         };
         var msg = this.get_msg("execute_request", content);
         this.shell_channel.send(JSON.stringify(msg));
         return msg.header.msg_id;
     }
 
 
     Kernel.prototype.complete = function (line, cursor_pos) {
         var content = {
             text : '',
             line : line,
             cursor_pos : cursor_pos
         };
         var msg = this.get_msg("complete_request", content);
         this.shell_channel.send(JSON.stringify(msg));
         return msg.header.msg_id;
     }
 
 
     Kernel.prototype.interrupt = function () {
         if (this.running) {
             $.post(this.kernel_url + "/interrupt");
         };
     };
 
 
     Kernel.prototype.kill = function () {
         if (this.running) {
             this.running = false;
             var settings = {
                 cache : false,
                 type : "DELETE",
             };
             $.ajax(this.kernel_url, settings);
         };
     };
 
     IPython.Kernel = Kernel;
 
     return IPython;
 
 }(IPython));