NIHVIVO-646 Disable author drag-drop if only 1 author (on page load or after removing an author)

productMods/edit/forms/addAuthorsToInformationResource.jsp

@@ -300,6 +300,7 @@ SPARQL queries for existing values. --%>
  
         int rank = 0;
         int index = 0;
+        request.setAttribute("authorshipCount", authorships.size());
         for ( Individual authorship : authorships ) {
             String rankDatatypeUri = "";
             DataPropertyStatement rankStmt = authorship.getDataPropertyStatement(rankPredicateUri);
@@ -329,13 +330,12 @@ SPARQL queries for existing values. --%>
                     <c:param name="uri" value="${authorUri}"/>
                 </c:url>
                 <c:url var="deleteAuthorshipHref" value="/edit/primitiveDelete" />
-
-                <%-- <c:url var="undoHref" value="/edit/addAuthorToInformationResource" /> --%>          
+        
                 <li class="authorship" id="${authorshipUri}">
                     <span class="rank" id="${rankValue}"></span> 
                     <span class="position" id="${position}"></span> 
                     <%-- This span will be used in the next phase, when we display a message that the author has been
-                    removed. That text will replace the a.authorLink. --%>
+                    removed. That text will replace the a.authorLink, which will be removed. --%>
                     <span class="author"><a href="${authorHref}" id="${authorUri}" class="authorLink">${authorName}</a>
                     <a href="${deleteAuthorshipHref}" class="remove">Remove</a>
                     <%-- <a href="${undoHref}" class="undo">Undo</a>  --%></span>

productMods/edit/forms/css/addAuthorsToInformationResource.css

@@ -7,8 +7,11 @@
 #authorships li {
     list-style: none;
     margin-bottom: .75em;
+}
+
+#authorships.ui-sortable li {
     padding-left: 1em;
-    background: url("../images/sortable_icon.png") no-repeat left center;
+    background: url("../images/sortable_icon.png") no-repeat left center;    
 }
 
 #authorships a.authorLink {
@@ -95,8 +98,6 @@ form a:hover.cancel,
     margin-top: 3em;
 }
 
-
-
 /* Disabling undo links for the present. Add back later. */
 /*
 a.undo, 

productMods/edit/forms/js/addAuthorsToInformationResource.js

@@ -97,7 +97,6 @@ var addAuthorForm = {
     	});
     	
     	this.removeAuthorshipLinks.click(function() {
-    		console.log($(this).parents('.authorship'));
     		// RY Upgrade this to a modal window
     		var message = "Are you sure you want to remove this author?";
     		if (!confirm(message)) {
@@ -122,17 +121,22 @@ var addAuthorForm = {
     						var pos = parseInt($(this).children('.position').attr('id'));
     						$(this).children('.position').attr('id', pos-1);
     					});
+    					
     					authorship.fadeOut(400, function() {
     						$(this).remove();
+        					// If there's just one author remaining, remove the drag and drop title message.
+        					if ($('.authorship').length == 1) {
+        						addAuthorForm.disableAuthorDD();
+        					}
     					});
-    					
+	
 //    					$(this).hide();
 //    					$(this).siblings('.undo').show();
 //    					author.html(authorName + ' has been removed');
 //    					author.css('width', 'auto');
 //    					author.effect("highlight", {}, 3000);
     				} else {
-    					alert('Error processing request');
+    					alert('Error processing request: author not removed');
     				}
     			}
     		});
@@ -148,6 +152,14 @@ var addAuthorForm = {
     	
     },
     
+    // Disable DD and cues if only one author remaining
+    disableAuthorDD: function() {
+    	var author = $('.authorship');
+    	$('#authorships').sortable({ disable: true} );
+    	author.css('background', 'none');
+    	author.css('padding-left', '0');
+    },
+    
     onLastNameChange: function() {
     	this.showFieldsForNewPerson();
     	this.firstNameField.focus();
@@ -279,7 +291,21 @@ var addAuthorForm = {
     },
     
     initAuthorReordering: function() {
-    	$('#authorships').sortable({
+    	
+    	var authorshipList = $('#authorships'),
+    		authorships = authorshipList.children();
+    	
+    	if (authorships.length < 2) {
+    		return;
+    	}
+    	
+    	authorships.each(function() {
+    		// Make sure all browsers support title attribute on elements other than link and image.
+    		// If not, move title to the author link.
+    		$(this).attr('title', 'Drag and drop to reorder authors');
+    	});
+    	
+    	authorshipList.sortable({
     		stop: function(event, ui) {
         		var predicateUri = '<' + $('.rankPred').attr('id') + '>',
         			rankXsdType = $('.rankXsdType').attr('id'),