Add support for URL fragment in pagination button's link

docs/sqlalchemy.rst

@@ -21,6 +21,7 @@ automatically rendered through the ``render_pagination`` macro:
                      ellipses='…',\
                      size=None,\
                      args={},\
+                     fragment='',\
                      **kwargs)
 
    Renders a pager for query pagination.
@@ -39,5 +40,6 @@ automatically rendered through the ``render_pagination`` macro:
    :param size: Can be 'sm' or 'lg' for smaller/larger pagination.
    :param args: Additional arguments passed to :func:`~flask.url_for`. If
                 ``endpoint`` is ``None``, uses :attr:`~flask.Request.args` and
-                :attr:`~flask.Request.view_args`
+                :attr:`~flask.Request.view_args`.
+   :param fragment: Add url fragment into link, such as ``#comment``. 
    :param kwargs: Extra attributes for the ``<ul>``-element.

flask_bootstrap/templates/bootstrap/pagination.html

@@ -14,7 +14,8 @@
                            next=('»')|safe,
                            size=None,
                            ellipses='…',
-                           args={}
+                           args={},
+                           fragment=''
                            )
 -%}
 {% with url_args = {} %}
@@ -26,13 +27,13 @@
   <ul class="pagination{% if size %} pagination-{{size}}{% endif %}"{{kwargs|xmlattr}}>
   {# prev and next are only show if a symbol has been passed. #}
   {% if prev != None -%}
-    <li{% if not pagination.has_prev %} class="disabled"{% endif %}><a href="{{_arg_url_for(endpoint, url_args, page=pagination.prev_num) if pagination.has_prev else '#'}}">{{prev}}</a></li>
+    <li{% if not pagination.has_prev %} class="disabled"{% endif %}><a href="{{_arg_url_for(endpoint, url_args, page=pagination.prev_num) if pagination.has_prev else '#'}}{{fragment}}">{{prev}}</a></li>
   {%- endif -%}
 
   {%- for page in pagination.iter_pages() %}
     {% if page %}
       {% if page != pagination.page %}
-        <li><a href="{{_arg_url_for(endpoint, url_args, page=page)}}">{{page}}</a></li>
+        <li><a href="{{_arg_url_for(endpoint, url_args, page=page)}}{{fragment}}">{{page}}</a></li>
       {% else %}
         <li class="active"><a href="#">{{page}} <span class="sr-only">(current)</span></a></li>
       {% endif %}
@@ -42,7 +43,7 @@
   {%- endfor %}
 
   {% if next != None -%}
-    <li{% if not pagination.has_next %} class="disabled"{% endif %}><a href="{{_arg_url_for(endpoint, url_args, page=pagination.next_num) if pagination.has_next else '#'}}">{{next}}</a></li>
+    <li{% if not pagination.has_next %} class="disabled"{% endif %}><a href="{{_arg_url_for(endpoint, url_args, page=pagination.next_num) if pagination.has_next else '#'}}{{fragment}}">{{next}}</a></li>
   {%- endif -%}
   </ul>
 </nav>