Use ajax to add/remove books from shelves

Gracefully fall back to standard requests if JavaScript is disabled

cps/static/css/style.css

@@ -53,3 +53,8 @@ span.glyphicon.glyphicon-tags {padding-right: 5px;color: #999;vertical-align: te
 .spinner2 {margin:0 41%;}
 
 .block-label {display: block;}
+
+#remove-from-shelves .btn,
+#shelf-action-errors {
+    margin-left: 5px;
+}

cps/static/js/details.js

@@ -0,0 +1,39 @@
+$( document ).ready(function() {
+    $("#have_read_form").ajaxForm();
+});
+
+$("#have_read_cb").on("change", function() {
+    $(this).closest("form").submit();
+});
+
+$(document).on("click", "[data-shelf-action]", function (e) {
+    e.preventDefault();
+
+    $.get(this.href)
+        .done(() => {
+            const $this = $(this);
+            switch ($this.data("shelf-action")) {
+                case "add":
+                    $("#remove-from-shelves").append(`<a href="${$this.data("remove-href")}"
+                       data-add-href="${this.href}"
+                       class="btn btn-sm btn-default" data-shelf-action="remove"
+                    ><span class="glyphicon glyphicon-remove"></span> ${this.textContent}</a>`);
+                    break;
+                case "remove":
+                    $("#add-to-shelves").append(`<li><a href="${$this.data("add-href")}"
+                      data-remove-href="${this.href}"
+                      data-shelf-action="add"
+                    >${this.textContent}</a></li>`);
+                    break;
+            }
+            this.parentNode.removeChild(this);
+        })
+        .fail(xhr => {
+            const $msg = $("<span/>", { "class": "text-danger"}).text(xhr.responseText);
+            $("#shelf-action-status").html($msg);
+
+            setTimeout(() => {
+                $msg.remove();
+            }, 10000);
+        });
+});

cps/templates/detail.html

@@ -189,37 +189,58 @@
             <span class="glyphicon glyphicon-list"></span> {{_('Add to shelf')}}
             <span class="caret"></span>
           </button>
-              <ul class="dropdown-menu" aria-labelledby="btnGroupDrop2">
+          <ul id="add-to-shelves" class="dropdown-menu" aria-labelledby="btnGroupDrop2">
             {% for shelf in g.user.shelf %}
               {% if not shelf.id in books_shelfs and shelf.is_public != 1 %}
-                    <li><a href="{{ url_for('add_to_shelf', book_id=entry.id, shelf_id=shelf.id) }}">{{shelf.name}}</a></li>
+                <li>
+                  <a href="{{ url_for('add_to_shelf', book_id=entry.id, shelf_id=shelf.id) }}"
+                     data-remove-href="{{ url_for('remove_from_shelf', book_id=entry.id, shelf_id=shelf.id) }}"
+                     data-shelf-action="add"
+                  >
+                    {{shelf.name}}
+                  </a>
+                </li>
               {% endif %}
             {%endfor%}
             {% for shelf in g.public_shelfes %}
               {% if not shelf.id in books_shelfs %}
-                    <li><a href="{{ url_for('add_to_shelf', book_id=entry.id, shelf_id=shelf.id) }}">{{shelf.name}}</a></li>
+                <li>
+                  <a href="{{ url_for('add_to_shelf', book_id=entry.id, shelf_id=shelf.id) }}"
+                     data-remove-href="{{ url_for('remove_from_shelf', book_id=entry.id, shelf_id=shelf.id) }}"
+                     data-shelf-action="add"
+                  >
+                    {{shelf.name}}
+                  </a>
+                </li>
               {% endif %}
             {%endfor%}
           </ul>
         </div>
+        <div id="remove-from-shelves" class="btn-group" role="group" aria-label="Remove from shelves">
           {% if books_shelfs %}
-        <div class="btn-group" role="group" aria-label="Remove from shelves">
             {% for shelf in g.user.shelf %}
               {% if shelf.id in books_shelfs and shelf.is_public != 1 %}
-                  <a href="{{ url_for('remove_from_shelf', book_id=entry.id, shelf_id=shelf.id) }}" class="btn btn-sm btn-default" role="button">
+                <a href="{{ url_for('remove_from_shelf', book_id=entry.id, shelf_id=shelf.id) }}"
+                   data-add-href="{{ url_for('add_to_shelf', book_id=entry.id, shelf_id=shelf.id) }}"
+                   class="btn btn-sm btn-default" role="button" data-shelf-action="remove"
+                >
                   <span class="glyphicon glyphicon-remove"></span> {{shelf.name}}
                 </a>
               {% endif %}
             {%endfor%}
             {% for shelf in g.public_shelfes %}
               {% if shelf.id in books_shelfs %}
-                  <a href="{{ url_for('remove_from_shelf', book_id=entry.id, shelf_id=shelf.id) }}" class="btn btn-sm btn-default" role="button">
+                <a href="{{ url_for('remove_from_shelf', book_id=entry.id, shelf_id=shelf.id) }}"
+                   data-add-href="{{ url_for('add_to_shelf', book_id=entry.id, shelf_id=shelf.id) }}"
+                   class="btn btn-sm btn-default" role="button" data-shelf-action="remove"
+                >
                   <span class="glyphicon glyphicon-remove"></span> {{shelf.name}}
                 </a>
               {% endif %}
             {%endfor%}
           {% endif %}
         </div>
+        <div id="shelf-action-errors" class="pull-left" role="alert"></div>
       </div>
       {% endif %}
 
@@ -233,19 +254,12 @@
       {% endif %}
       </div>
 
-
+    </div>
   </div>
 </div>
 {% endblock %}
 
 {% block js %}
 <script src="{{ url_for('static', filename='js/libs/jquery.form.js') }}"></script>
-<script>
-  $( document ).ready(function() {
-    $('#have_read_form').ajaxForm();
-  });
-  $("#have_read_cb").on('change', function() {
-    $(this).closest('form').submit();
-  });
-</script>
+<script src="{{ url_for('static', filename='js/details.js') }}"></script>
 {% endblock %}

cps/templates/layout.html

@@ -99,17 +99,17 @@
     </div>
     {% for message in get_flashed_messages(with_categories=True) %}
       {%if message[0] == "error" %}
-      <div class="row-fluid" style="margin-top: -20px; text-align: center;">
+      <div class="row-fluid text-center" style="margin-top: -20px;">
         <div id="flash_alert" class="alert alert-danger">{{ message[1] }}</div>
       </div>
       {%endif%}
       {%if message[0] == "info" %}
-      <div class="row-fluid" style="margin-top: -20px; text-align: center;">
+      <div class="row-fluid text-center" style="margin-top: -20px;">
         <div id="flash_info" class="alert alert-info">{{ message[1] }}</div>
       </div>
       {%endif%}
       {%if message[0] == "success" %}
-      <div class="row-fluid" style="margin-top: -20px; text-align: center;">
+      <div class="row-fluid text-center" style="margin-top: -20px;">
         <div id="flash_success" class="alert alert-success">{{ message[1] }}</div>
       </div>
       {%endif%}

cps/web.py

@@ -1949,45 +1949,80 @@ def send_to_kindle(book_id):
 @login_required
 def add_to_shelf(shelf_id, book_id):
     shelf = ub.session.query(ub.Shelf).filter(ub.Shelf.id == shelf_id).first()
+    if shelf is None:
+        app.logger.info("Invalid shelf specified")
+        if not request.is_xhr:
+            return redirect(url_for('index'))
+        return "Invalid shelf specified", 400
+
     if not shelf.is_public and not shelf.user_id == int(current_user.id):
         app.logger.info("Sorry you are not allowed to add a book to the the shelf: %s" % shelf.name)
+        if not request.is_xhr:
             return redirect(url_for('index'))
-    maxOrder = ub.session.query(func.max(ub.BookShelf.order)).filter(ub.BookShelf.shelf == shelf_id).first()
+        return "Sorry you are not allowed to add a book to the the shelf: %s" % shelf.name, 403
+
+    if shelf.is_public and not current_user.role_edit_shelfs():
+        app.logger.info("User is not allowed to edit public shelves")
+        if not request.is_xhr:
+            return redirect(url_for('index'))
+        return "User is not allowed to edit public shelves", 403
+
     book_in_shelf = ub.session.query(ub.BookShelf).filter(ub.BookShelf.shelf == shelf_id,
                                           ub.BookShelf.book_id == book_id).first()
     if book_in_shelf:
         app.logger.info("Book is already part of the shelf: %s" % shelf.name)
+        if not request.is_xhr:
             return redirect(url_for('index'))
+        return "Book is already part of the shelf: %s" % shelf.name, 400
+
+    maxOrder = ub.session.query(func.max(ub.BookShelf.order)).filter(ub.BookShelf.shelf == shelf_id).first()
     if maxOrder[0] is None:
         maxOrder = 0
     else:
         maxOrder = maxOrder[0]
-    if (shelf.is_public and current_user.role_edit_shelfs()) or not shelf.is_public:
+
     ins = ub.BookShelf(shelf=shelf.id, book_id=book_id, order=maxOrder + 1)
     ub.session.add(ins)
     ub.session.commit()
+    if not request.is_xhr:
         flash(_(u"Book has been added to shelf: %(sname)s", sname=shelf.name), category="success")
         return redirect(request.environ["HTTP_REFERER"])
-    else:
-        app.logger.info("User is not allowed to edit public shelfs")
-        return redirect(url_for('index'))
+    return "", 204
 
 
 @app.route("/shelf/remove/<int:shelf_id>/<int:book_id>")
 @login_required
 def remove_from_shelf(shelf_id, book_id):
     shelf = ub.session.query(ub.Shelf).filter(ub.Shelf.id == shelf_id).first()
+    if shelf is None:
+        app.logger.info("Invalid shelf specified")
+        if not request.is_xhr:
+            return redirect(url_for('index'))
+        return "Invalid shelf specified", 400
+
     if not shelf.is_public and not shelf.user_id == int(current_user.id) \
             or (shelf.is_public and current_user.role_edit_shelfs()):
+        if not request.is_xhr:
             app.logger.info("Sorry you are not allowed to remove a book from this shelf: %s" % shelf.name)
             return redirect(url_for('index'))
+        return "Sorry you are not allowed to add a book to the the shelf: %s" % shelf.name, 403
 
     book_shelf = ub.session.query(ub.BookShelf).filter(ub.BookShelf.shelf == shelf_id,
                                                        ub.BookShelf.book_id == book_id).first()
+
+    if book_shelf is None:
+        app.logger.info("Book already removed from shelf")
+        if not request.is_xhr:
+            return redirect(url_for('index'))
+        return "Book already removed from shelf", 410
+
     ub.session.delete(book_shelf)
     ub.session.commit()
+
+    if not request.is_xhr:
         flash(_(u"Book has been removed from shelf: %(sname)s", sname=shelf.name), category="success")
         return redirect(request.environ["HTTP_REFERER"])
+    return "", 204
 
 
 @app.route("/shelf/create", methods=["GET", "POST"])