Add global JS and post methods

web/views/templates/base

@@ -36,7 +36,7 @@ List of block elements in this page:
 
 			{% block global_scripts %}
 			<script type="text/javascript">
-			{# Scripts used globally go here. #}
+			{% include global_scripts.js %}
 			</script>
 			{% endblock %}
 
@@ -59,7 +59,6 @@ List of block elements in this page:
 					<a class="brand" href="#">{% block navbar_title %}{% endblock %}</a>
 
 					{% block navbar_content %}
-
 					<div class="btn-group pull-right">
 						<a class="btn" href="#">{{ user.username }}</a>
 						<a class="btn dropdown-toggle" data-toggle="dropdown" href="#">
@@ -69,8 +68,8 @@ List of block elements in this page:
 							<li id="btn_logout"><a href="/logout">Logout</a></li>
 						</ul>
 					</div>
-
 					{% endblock %}
+
 				</div>
 			</div>
 		</div>

web/views/templates/global_scripts.js

@@ -0,0 +1,68 @@
+/* The JS below is included globally (unless a page over-rides it) */
+
+function _default_ajax_success(data)
+{
+	return true;
+}
+
+function _default_ajax_error(data, error_string)
+{
+	alertHTML = "<div class=\"alert alert-error\">Error processing AJAX request! Error: \"" + error_string + "\"</div>";
+	$('body').prepend(alertHTML);
+
+	return true;
+}
+
+function server_post(url, data, success_function, error_function)
+{
+	/* Push data to the server using AJAX.
+	 * This function returns immediately */
+	
+	if (typeof(url) !== "string")
+		return false;
+
+	if (typeof(data) !== "object")
+		return false;
+
+	if (typeof(success_function) !== "function")
+		success_function = _default_ajax_success;
+
+	if (typeof(error_function) !== "function")
+		error_function = _default_ajax_error;
+
+	return 
+		jQuery.ajax({
+			type: "POST",
+			url:  url,
+			data: data,
+			success: success_function,
+			error: error_function
+		});
+}
+
+function sserver_post(url, data, success_function, error_function)
+{
+	/* Push data to the server using AJAX, and do so synchronously.
+	 * That is, this function won't return until the request completes.*/
+	if (typeof(url) !== "string")
+		return false;
+
+	if (typeof(data) !== "object")
+		return false;
+
+	if (typeof(success_function) !== "function")
+		success_function = _default_ajax_success;
+
+	if (typeof(error_function) !== "function")
+		error_function = _default_ajax_error;
+
+	return
+		jQuery.ajax({
+			type: "POST",
+			url: url,
+			data: data,
+			success: success_function,
+			error: error_function,
+			async: false
+		});
+}