From c172c8b46c02c5275ef7857dab1bd4c53dbf7ee0 Mon Sep 17 00:00:00 2001
From: Étienne Loks <etienne.loks@iggdrasil.net>
Date: Mon, 11 May 2026 17:24:15 +0200
Subject: 💄 UI: dark/light mode switcher
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ishtar_common/static/js/ishtar.js     | 45 +++++++++++++++++++++++++++++++++++
 ishtar_common/static/media/styles.css |  6 ++---
 ishtar_common/templates/base.html     |  1 +
 ishtar_common/templates/navbar.html   |  7 ++++++
 scss/custom.scss                      | 15 ++++++++----
 5 files changed, 65 insertions(+), 9 deletions(-)

diff --git a/ishtar_common/static/js/ishtar.js b/ishtar_common/static/js/ishtar.js
index fde903ac3..519c17158 100644
--- a/ishtar_common/static/js/ishtar.js
+++ b/ishtar_common/static/js/ishtar.js
@@ -85,6 +85,51 @@ text_truncate = function(str, length) {
     }
 };
 
+function switchTheme(e) {
+    var toggleSwitch = document.querySelector('#theme-switch input[type="checkbox"]');
+    if (e.target.checked) {
+        localStorage.setItem('theme', 'dark');
+        document.documentElement.setAttribute('data-theme', 'dark');
+        toggleSwitch.checked = true;
+        $("#theme-switch .fa.fa-sun-o").addClass("d-none");
+        $("#theme-switch .fa.fa-moon-o").removeClass("d-none");
+    } else {
+        localStorage.setItem('theme', 'light');
+        document.documentElement.setAttribute('data-theme', 'light');
+        toggleSwitch.checked = false;
+        $("#theme-switch .fa.fa-moon-o").addClass("d-none");
+        $("#theme-switch .fa.fa-sun-o").removeClass("d-none");
+    }
+}
+
+function manageColorScheme(){
+    var theme = "light";
+    if(localStorage.getItem("theme")){
+        if(localStorage.getItem("theme") == "dark"){
+            theme = "dark";
+        }
+    } else {
+        const dark_mode_mql = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)');
+        if (dark_mode_mql && dark_mode_mql.matches) {
+            theme = "dark";
+        }
+    }
+    if (theme == "dark") {
+        document.documentElement.setAttribute("data-theme", "dark");
+        $("#theme-switch .fa.fa-sun-o").addClass("d-none");
+        $("#theme-switch .fa.fa-moon-o").removeClass("d-none");
+    } else {
+        $("#theme-switch .fa.fa-moon-o").addClass("d-none");
+        $("#theme-switch .fa.fa-sun-o").removeClass("d-none");
+    }
+    var toggleSwitch = document.querySelector('#theme-switch input[type="checkbox"]');
+    toggleSwitch.addEventListener('change', switchTheme, false);
+    // pre-check the dark-theme checkbox if dark-theme is set
+    if (document.documentElement.getAttribute("data-theme") == "dark"){
+        toggleSwitch.checked = true;
+    }
+}
+
 /* default function to prevent undefined */
 function get_next_table_id(){}
 function get_previous_table_id(){}
diff --git a/ishtar_common/static/media/styles.css b/ishtar_common/static/media/styles.css
index 515293653..2ed496c31 100644
--- a/ishtar_common/static/media/styles.css
+++ b/ishtar_common/static/media/styles.css
@@ -202,8 +202,6 @@ table.dataTable thead th, table.dataTable thead td {
     height: 50px;
 }
 
-@media (prefers-color-scheme: dark) {
-    html{
-        background-image: url('images/ishtar-bg-dark.png');
-    }
+html[data-theme="dark"] {
+    background-image: url('images/ishtar-bg-dark.png');
 }
diff --git a/ishtar_common/templates/base.html b/ishtar_common/templates/base.html
index 7d57fa54e..8b3ed35a1 100644
--- a/ishtar_common/templates/base.html
+++ b/ishtar_common/templates/base.html
@@ -234,6 +234,7 @@
     <script type="text/javascript">{% localize off %}
     {% block end_js %}
     {% endblock %}
+    $(document).ready(manageColorScheme);
     {% endlocalize %}</script>
 </body>
 
diff --git a/ishtar_common/templates/navbar.html b/ishtar_common/templates/navbar.html
index 79023100a..627269302 100644
--- a/ishtar_common/templates/navbar.html
+++ b/ishtar_common/templates/navbar.html
@@ -65,6 +65,13 @@
             </div>
         </li>
         {% endif %}
+        <li class="nav-item">
+            <label id="theme-switch" class="theme-switch nav-link" for="checkbox_theme">
+                <i class="fa fa-sun-o" aria-hidden="true"></i>
+                <i class="fa fa-moon-o d-none" aria-hidden="true"></i>
+                <input type="checkbox" id="checkbox_theme">
+            </label>
+        </li>
         {% if user.is_staff %}
         <li class="nav-item">
             <a class="nav-link" href="/admin/">
diff --git a/scss/custom.scss b/scss/custom.scss
index 5672eb61a..43e4b7b43 100644
--- a/scss/custom.scss
+++ b/scss/custom.scss
@@ -1270,6 +1270,11 @@ ul.simple,
     padding: 0 1em;
 }
 
+
+#theme-switch input {
+    display: none;
+}
+
 /*
 // required
 @import "bootstrap-src/scss/functions";
@@ -1296,12 +1301,12 @@ $dark-theme-dark-hover-alt: #6a6a6a;
 $dark-theme-red: #912d2d;
 
 
-@media (prefers-color-scheme: dark) {
-    html {
-        background-image: url('images/ishtar-bg-dark.png');
-        background-color: $dark-theme-dark-bg;
-    }
+html[data-theme="dark"] {
+    background-image: url('images/ishtar-bg-dark.png');
+    background-color: $dark-theme-dark-bg;
+}
 
+[data-theme="dark"] {
     .ui-menu-item{ /* autocomplete is kept white on focus -> set color to dark */
         color: $gray-700;
     }
-- 
cgit v1.2.3