dashboard autorefresh

refresh notebook list and cluster list when :
- page get focus
- every 60 sec when page is on focus

stop refreshing every 60 sec when page loose focus

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

@@ -1,42 +1,75
 //----------------------------------------------------------------------------
 //  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.
 //----------------------------------------------------------------------------
 
 //============================================================================
 // On document ready
 //============================================================================
 
 
 $(document).ready(function () {
 
     IPython.page = new IPython.Page();
 
     $('div#tabs').tabs();
     $('div#tabs').on('tabsselect', function (event, ui) {
         var new_url = $('body').data('baseProjectUrl') + '#' + ui.panel.id;
         window.history.replaceState({}, '', new_url);
     });
     $('div#main_app').addClass('border-box-sizing ui-widget');
     $('div#notebooks_toolbar').addClass('ui-widget ui-helper-clearfix');    
     $('#new_notebook').button().click(function (e) {
         window.open($('body').data('baseProjectUrl')+'new');
     });
 
     IPython.read_only = $('body').data('readOnly') === 'True';
     IPython.notebook_list = new IPython.NotebookList('div#notebook_list');
     IPython.cluster_list = new IPython.ClusterList('div#cluster_list');
     IPython.login_widget = new IPython.LoginWidget('span#login_widget');
 
-    IPython.notebook_list.load_list();
-    IPython.cluster_list.load_list();
+    var interval_id=0;
+    // auto refresh every xx secondes, no need to be fast,
+    //  update is done at least when page get focus
+    var time_refresh = 60; // in sec
+
+    var enable_autorefresh = function(){
+        //refresh immediately , then start interval
+        IPython.notebook_list.load_list();
+        IPython.cluster_list.load_list();
+        if (!interval_id){
+            interval_id = setInterval(function(){
+                    IPython.notebook_list.load_list();
+                    IPython.cluster_list.load_list();
+                }, time_refresh*1000);
+            }
+    }
+
+    var disable_autorefresh = function(){
+        clearInterval(interval_id);
+        interval_id = 0;
+    }
+
+    // stop autorefresh when page lose focus
+    $(window).blur(function() {
+        disable_autorefresh();
+    })
+
+    //re-enable when page get focus back
+    $(window).focus(function() {
+        enable_autorefresh();
+    });
+
+    // finally start it, it will refresh immediately
+    enable_autorefresh();
+
     IPython.page.show();
     
     // bound the upload method to the on change of the file select list
     $("#alternate_upload").change(function (event){
         IPython.notebook_list.handelFilesUpload(event,'form');
     });
 });