Show success messages on the subscriptions page.

(imported from commit 771fa4459e6a09ffc4132ccff12372b204334de2)

tools/jslint/check-all.js

@@ -32,7 +32,7 @@ var globals =
 
     // ui.js
     + ' register_onclick hide_email show_email'
-    + ' report_error clicking mouse_moved'
+    + ' report_error report_success clicking mouse_moved'
     + ' update_autocomplete autocomplete_needs_update'
 
     // zephyr.js

zephyr/static/js/subscribe.js

@@ -48,6 +48,8 @@ $(function () {
                 class_list.splice(removal_index, 1);
             }
             update_autocomplete();
+            report_success("Successfully removed subscription to " + name,
+                           $("#subscriptions-status"));
         },
         error: function (xhr) {
             report_error("Error removing subscription", xhr, $("#subscriptions-status"));
@@ -61,6 +63,8 @@ $(function () {
             var name = $.parseJSON(xhr.responseText).data;
             $('#subscriptions_table').prepend(templates.subscription({subscription: name}));
             class_list.push(name.toLowerCase());
+            report_success("Successfully added subscription to " + name,
+                           $("#subscriptions-status"));
             $("#new_subscription").focus();
         },
         error: function (xhr) {

zephyr/static/js/ui.js

@@ -51,6 +51,12 @@ function report_error(response, xhr, status_box) {
     status_box.show();
 }
 
+function report_success(response, status_box) {
+    status_box.removeClass(status_classes).addClass('alert-success')
+              .text(response).stop(true).fadeTo(0, 1);
+    status_box.show();
+}
+
 var clicking = false;
 var mouse_moved = false;