Lab variants: redirect back anchors to the saved variant with highlight

web/src/main/kotlin/ru/ysu/lms/web/admin/AdminLabController.kt

@@ -403,6 +403,7 @@ class AdminLabController(
         redirect: RedirectAttributes,
     ): String =
         try {
+            val detail =
                 api.saveVariant(
                     token(session),
                     labId,
@@ -410,7 +411,16 @@ class AdminLabController(
                     VariantSavePayload(form.labLevelId, form.number, form.title, form.statementMd),
                 )
             redirect.addFlashAttribute("notice", "Вариант сохранён")
-            "redirect:/admin/labs/$labId"
+            // вернуться к отредактированному/созданному варианту на странице лабы
+            val anchor =
+                form.variantId
+                    ?.takeIf { it.isNotBlank() }
+                    ?: detail.levels
+                        .firstOrNull { it.id == form.labLevelId }
+                        ?.variants
+                        ?.firstOrNull { it.number == form.number.trim() }
+                        ?.id
+            if (anchor.isNullOrBlank()) "redirect:/admin/labs/$labId" else "redirect:/admin/labs/$labId#variant-$anchor"
         } catch (ex: ApiException) {
             redirect.addFlashAttribute("error", ex.message)
             "redirect:/admin/labs/$labId"

web/src/main/resources/static/css/app.css

@@ -89,6 +89,7 @@ a:not(.btn):hover { color: var(--c-accent-hover); }
 .user { display: flex; align-items: center; gap: 0.75rem; font-size: 0.84375rem; margin-left: auto; }
 .nav-user { font-weight: 500; color: var(--c-text); }
 .score-big { display: inline-block; margin-left: 0.5rem; font-size: 1.75rem; font-weight: 700; line-height: 1; color: var(--c-tone-pos); font-variant-numeric: tabular-nums; vertical-align: middle; }
+.variant-block:target { outline: 2px solid var(--c-accent); outline-offset: 4px; border-radius: var(--radius); }
 .variant-name { font-weight: 600; }
 .variant-name b { font-variant-numeric: tabular-nums; }
 p { margin-top: 0; }

web/src/main/resources/templates/admin/lab.html

@@ -99,7 +99,7 @@
                 </div>
             </div>
 
-            <div th:each="v : ${level.variants}" class="variant-block mb-4">
+            <div th:each="v : ${level.variants}" class="variant-block mb-4" th:id="'variant-' + ${v.id}">
                 <div class="flex flex-wrap items-center justify-between gap-2">
                     <div class="variant-name">Вариант <b th:text="${v.number}">—</b><span th:if="${v.title}"
                                                                                           class="text-muted"