Drag target bigger for empty notebook dashboard

When no notebooks, show "Notebook list empty", which increase the size
of the drag target.

fixes  #1492

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

@@ -1,310 +1,319
 //----------------------------------------------------------------------------
 //  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.
 //----------------------------------------------------------------------------
 
 //============================================================================
 // NotebookList
 //============================================================================
 
 var IPython = (function (IPython) {
 
     var NotebookList = function (selector) {
         this.selector = selector;
         if (this.selector !== undefined) {
             this.element = $(selector);
             this.style();
             this.bind_events();
         }
     };
 
     NotebookList.prototype.style = function () {
         $('#notebook_toolbar').addClass('list_toolbar');
         $('#drag_info').addClass('toolbar_info');
         $('#notebook_buttons').addClass('toolbar_buttons');
         $('div#project_name').addClass('list_header ui-widget ui-widget-header');
         $('#refresh_notebook_list').button({
             icons : {primary: 'ui-icon-arrowrefresh-1-s'},
             text : false
         });
     };
 
 
     NotebookList.prototype.bind_events = function () {
         if (IPython.read_only){
             return;
         }
         var that = this;
         $('#refresh_notebook_list').click(function () {
             that.load_list();
         });
         this.element.bind('dragover', function () {
             return false;
         });
         this.element.bind('drop', function(event){
             that.handelFilesUpload(event,'drop');
             return false;
         });
     };
 
     NotebookList.prototype.handelFilesUpload =  function(event, dropOrForm) {
         var that = this;
         var files;
         if(dropOrForm =='drop'){
             files = event.originalEvent.dataTransfer.files;
         } else 
         {
             files = event.originalEvent.target.files
         }
         for (var i = 0, f; f = files[i]; i++) {
             var reader = new FileReader();
             reader.readAsText(f);
             var fname = f.name.split('.'); 
             var nbname = fname.slice(0,-1).join('.');
             var nbformat = fname.slice(-1)[0];
             if (nbformat === 'ipynb') {nbformat = 'json';};
             if (nbformat === 'py' || nbformat === 'json') {
                 var item = that.new_notebook_item(0);
                 that.add_name_input(nbname, item);
                 item.data('nbformat', nbformat);
                 // Store the notebook item in the reader so we can use it later
                 // to know which item it belongs to.
                 $(reader).data('item', item);
                 reader.onload = function (event) {
                     var nbitem = $(event.target).data('item');
                     that.add_notebook_data(event.target.result, nbitem);
                     that.add_upload_button(nbitem);
                 };
             };
         }
         return false;
         };
 
     NotebookList.prototype.clear_list = function () {
         this.element.children('.list_item').remove();
     }
 
 
     NotebookList.prototype.load_list = function () {
         var settings = {
             processData : false,
             cache : false,
             type : "GET",
             dataType : "json",
             success : $.proxy(this.list_loaded, this)
         };
         var url = $('body').data('baseProjectUrl') + 'notebooks';
         $.ajax(url, settings);
     };
 
 
     NotebookList.prototype.list_loaded = function (data, status, xhr) {
         var len = data.length;
         this.clear_list();
-        // Todo: remove old children
+
+        if(len == 0)
+        {
+            $(this.new_notebook_item(0))
+                .append(
+                    $('<div style="margin:auto;text-align:center;color:grey"/>')
+                    .text('Notebook list empty.')
+                    )
+        }
+
         for (var i=0; i<len; i++) {
             var notebook_id = data[i].notebook_id;
             var nbname = data[i].name;
             var kernel = data[i].kernel_id;
             var item = this.new_notebook_item(i);
             this.add_link(notebook_id, nbname, item);
             if (!IPython.read_only){
                 // hide delete buttons when readonly
                 if(kernel == null){
                     this.add_delete_button(item);
                 } else {
                     this.add_shutdown_button(item,kernel);
                 }
             }
         };
     };
 
 
     NotebookList.prototype.new_notebook_item = function (index) {
         var item = $('<div/>');
         item.addClass('list_item ui-widget ui-widget-content ui-helper-clearfix');
         item.css('border-top-style','none');
         var item_name = $('<span/>').addClass('item_name');
 
         item.append(item_name);
         if (index === -1) {
             this.element.append(item);
         } else {
             this.element.children().eq(index).after(item);
         }
         return item;
     };
 
 
     NotebookList.prototype.add_link = function (notebook_id, nbname, item) {
         item.data('nbname', nbname);
         item.data('notebook_id', notebook_id);
         var new_item_name = $('<span/>').addClass('item_name');
         new_item_name.append(
             $('<a/>').
             attr('href', $('body').data('baseProjectUrl')+notebook_id).
             attr('target','_blank').
             text(nbname)
         );
         var e = item.find('.item_name');
         if (e.length === 0) {
             item.append(new_item_name);
         } else {
             e.replaceWith(new_item_name);
         };
     };
 
 
     NotebookList.prototype.add_name_input = function (nbname, item) {
         item.data('nbname', nbname);
         var new_item_name = $('<span/>').addClass('item_name');
         new_item_name.append(
             $('<input/>').addClass('ui-widget ui-widget-content').
             attr('value', nbname).
             attr('size', '30').
             attr('type', 'text')
         );
         var e = item.find('.item_name');
         if (e.length === 0) {
             item.append(new_item_name);
         } else {
             e.replaceWith(new_item_name);
         };
     };
 
 
     NotebookList.prototype.add_notebook_data = function (data, item) {
         item.data('nbdata',data);
     };
 
 
     NotebookList.prototype.add_shutdown_button = function (item,kernel) {
         var new_buttons = $('<span/>').addClass('item_buttons');
         var that = this;
         var shutdown_button = $('<button>Shutdown</button>').button().
             click(function (e) {
                 var settings = {
                     processData : false,
                     cache : false,
                     type : "DELETE",
                     dataType : "json",
                     success : function (data, status, xhr) {
                         that.load_list();
                     }
                 };
                 var url = $('body').data('baseProjectUrl') + 'kernels/'+kernel;
                 $.ajax(url, settings);
             });
         new_buttons.append(shutdown_button);
         var e = item.find('.item_buttons');
         if (e.length === 0) {
             item.append(new_buttons);
         } else {
             e.replaceWith(new_buttons);
         };
     };
 
     NotebookList.prototype.add_delete_button = function (item) {
         var new_buttons = $('<span/>').addClass('item_buttons');
         var delete_button = $('<button>Delete</button>').button().
             click(function (e) {
                 // $(this) is the button that was clicked.
                 var that = $(this);
                 // We use the nbname and notebook_id from the parent notebook_item element's
                 // data because the outer scopes values change as we iterate through the loop.
                 var parent_item = that.parents('div.list_item');
                 var nbname = parent_item.data('nbname');
                 var notebook_id = parent_item.data('notebook_id');
                 var dialog = $('<div/>');
                 dialog.html('Are you sure you want to permanently delete the notebook: ' + nbname + '?');
                 parent_item.append(dialog);
                 dialog.dialog({
                     resizable: false,
                     modal: true,
                     title: "Delete notebook",
                     buttons : {
                         "Delete": function () {
                             var settings = {
                                 processData : false,
                                 cache : false,
                                 type : "DELETE",
                                 dataType : "json",
                                 success : function (data, status, xhr) {
                                     parent_item.remove();
                                 }
                             };
                             var url = $('body').data('baseProjectUrl') + 'notebooks/' + notebook_id;
                             $.ajax(url, settings);
                             $(this).dialog('close');
                         },
                         "Cancel": function () {
                             $(this).dialog('close');
                         }
                     }
                 });
             });
         new_buttons.append(delete_button);
         var e = item.find('.item_buttons');
         if (e.length === 0) {
             item.append(new_buttons);
         } else {
             e.replaceWith(new_buttons);
         };
     };
 
 
     NotebookList.prototype.add_upload_button = function (item) {
         var that = this;
         var new_buttons = $('<span/>').addClass('item_buttons');
         var upload_button = $('<button>Upload</button>').button().
             addClass('upload-button').
             click(function (e) {
                 var nbname = item.find('.item_name > input').attr('value');
                 var nbformat = item.data('nbformat');
                 var nbdata = item.data('nbdata');
                 var content_type = 'text/plain';
                 if (nbformat === 'json') {
                     content_type = 'application/json';
                 } else if (nbformat === 'py') {
                     content_type = 'application/x-python';
                 };
                 var settings = {
                     processData : false,
                     cache : false,
                     type : 'POST',
                     dataType : 'json',
                     data : nbdata,
                     headers : {'Content-Type': content_type},
                     success : function (data, status, xhr) {
                         that.add_link(data, nbname, item);
                         that.add_delete_button(item);
                     }
                 };
 
                 var qs = $.param({name:nbname, format:nbformat});
                 var url = $('body').data('baseProjectUrl') + 'notebooks?' + qs;
                 $.ajax(url, settings);
             });
         var cancel_button = $('<button>Cancel</button>').button().
             click(function (e) {
                 item.remove();
             });
         upload_button.addClass('upload_button');
         new_buttons.append(upload_button).append(cancel_button);
         var e = item.find('.item_buttons');
         if (e.length === 0) {
             item.append(new_buttons);
         } else {
             e.replaceWith(new_buttons);
         };
     };
 
 
     IPython.NotebookList = NotebookList;
 
     return IPython;
 
 }(IPython));