use full base_url in html and js

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

@@ -10,6 +10,7 b''
 //============================================================================
 
 var IPython = (function (IPython) {
+    var base_url = $('body').data('baseProjectUrl');
 
     var LoginWidget = function (selector) {
         this.selector = selector;
@@ -29,10 +30,10 b' var IPython = (function (IPython) {'
     LoginWidget.prototype.bind_events = function () {
         var that = this;
         this.element.find("button#logout").click(function () {
-            window.location = "logout";
+            window.location = base_url+"logout";
         });
         this.element.find("button#login").click(function () {
-            window.location = "login";
+            window.location = base_url+"login";
         });
     };
 

IPython/frontend/html/notebook/templates/login.html

@@ -16,7 +16,7 b''
 <div id="main_app">
 
     {% if login_available %}
-    <form action="login?next={{url_escape(next)}}" method="post">
+    <form action="{{base_project_url}}login?next={{url_escape(next)}}" method="post">
         Password: <input type="password" class='ui-widget ui-widget-content' name="password" id="password_input">
         <input type="submit" value="Log in" id="login_submit">
     </form>

IPython/frontend/html/notebook/templates/logout.html

@@ -23,9 +23,9 b''
     {% end %}
 
     {% if read_only or not login_available %}
-    Proceed to the <a href="">dashboard</a>.
+    Proceed to the <a href="{{base_project_url}}">dashboard</a>.
     {% else %}
-    Proceed to the <a href="login">login page</a>.
+    Proceed to the <a href="{{base_project_url}}login">login page</a>.
     {% end %}