From 9986053e73c1ecf74353991c9cb0ef77fd46dcc8 Mon Sep 17 00:00:00 2001
From: Samuel Dionne-Riel <samuel@dionne-riel.com>
Date: Sat, 1 Dec 2018 13:39:10 -0500
Subject: [PATCH] Controllers: allows lazy tabs to return custom errors.

---
 src/lib/Hydra/Controller/Root.pm | 8 +++++++-
 src/root/lazy_error.tt           | 5 +++++
 src/root/static/js/common.js     | 6 +++++-
 3 files changed, 17 insertions(+), 2 deletions(-)
 create mode 100644 src/root/lazy_error.tt

diff --git a/src/lib/Hydra/Controller/Root.pm b/src/lib/Hydra/Controller/Root.pm
index 146c37a4..a486091f 100644
--- a/src/lib/Hydra/Controller/Root.pm
+++ b/src/lib/Hydra/Controller/Root.pm
@@ -237,7 +237,13 @@ sub end : ActionClass('RenderView') {
 
     elsif (scalar @{$c->error}) {
         $c->stash->{resource} = { error => join "\n", @{$c->error} };
-        $c->stash->{template} = 'error.tt';
+        if ($c->stash->{lazy}) {
+            $c->response->headers->header('X-Hydra-Lazy', 'Yes');
+            $c->stash->{template} = 'lazy_error.tt';
+        }
+        else {
+            $c->stash->{template} = 'error.tt';
+        }
         $c->stash->{errors} = $c->error;
         $c->response->status(500) if $c->response->status == 200;
         if ($c->response->status >= 300) {
diff --git a/src/root/lazy_error.tt b/src/root/lazy_error.tt
new file mode 100644
index 00000000..38bcfcb6
--- /dev/null
+++ b/src/root/lazy_error.tt
@@ -0,0 +1,5 @@
+[% PROCESS common.tt %]
+
+[% FOREACH error IN errors %]
+   <div class="alert alert-error">[% HTML.escape(error).replace('\n', '<br/>') %]</div>
+[% END %]
diff --git a/src/root/static/js/common.js b/src/root/static/js/common.js
index 1fe2f778..baa74ae6 100644
--- a/src/root/static/js/common.js
+++ b/src/root/static/js/common.js
@@ -108,9 +108,13 @@ function makeLazyTab(tabName, uri) {
         if (id == '#' + tabName && !tabsLoaded[id]) {
           tabsLoaded[id] = 1;
           $('#' + tabName).load(uri, function(response, status, xhr) {
-            if (status == "error") {
+            var lazy = xhr.getResponseHeader("X-Hydra-Lazy") === "Yes";
+            if (status == "error" && !lazy) {
               $('#' + tabName).html("<div class='alert alert-error'>Error loading tab: " + xhr.status + " " + xhr.statusText + "</div>");
             }
+            else {
+              $('#' + tabName).html(response);
+            }
           });
         }
     });