From 9773e62c46b3faebb8e621718f3e9870fbd24d10 Mon Sep 17 00:00:00 2001
From: blankie <blankie@nixnetmail.com>
Date: Mon, 29 May 2023 23:02:28 +0700
Subject: [PATCH] Add better support for tabs

Some pages break without actual tab support, such as
https://breezewiki.com/ben10/wiki/Ultimatrix_(Original)#Modes

This change aims to work with old browsers (such as Firefox for Android 68)
and browsers with Javascript disabled (by showing all tab contents and hiding
the tab bar, i.e. how tabs work before this change).
---
 src/application-globals.rkt |  3 +-
 static/main.css             |  6 ++--
 static/tabs.js              | 63 +++++++++++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+), 4 deletions(-)
 create mode 100644 static/tabs.js

diff --git a/src/application-globals.rkt b/src/application-globals.rkt
index de60820a..a4137854 100644
--- a/src/application-globals.rkt
+++ b/src/application-globals.rkt
@@ -203,10 +203,11 @@
            `(script (@ (type "module") (src ,(get-static-url "search-suggestions.js"))))
            "")
       (script (@ (type "module") (src ,(get-static-url "countdown.js"))))
+      (script (@ (defer) (src ,(get-static-url "tabs.js"))))
       (link (@ (rel "icon") (href ,(u (λ (v) (config-true? 'strict_proxy))
                                       (λ (v) (u-proxy-url v))
                                       (head-data^-icon-url head-data))))))
-     (body (@ (class ,(head-data^-body-class head-data)))
+     (body (@ (class ,(head-data^-body-class head-data) " bw-tabs-nojs"))
            ,(let ([extension-eligible?
                    (cond/var
                     [(not req) #f]
diff --git a/static/main.css b/static/main.css
index cb32df5a..6b07d2b8 100644
--- a/static/main.css
+++ b/static/main.css
@@ -202,11 +202,11 @@ figcaption, .lightbox-caption, .thumbcaption {
     padding: 0;
 }
 
-/* show tabs always */
-.wds-tabs__wrapper {
+/* show tabs if tabs.js isn't loaded */
+.bw-tabs-nojs .wds-tabs__wrapper {
     display: none;
 }
-.wds-tab__content {
+.bw-tabs-nojs .wds-tab__content {
     display: block;
 }
 
diff --git a/static/tabs.js b/static/tabs.js
new file mode 100644
index 00000000..589261d9
--- /dev/null
+++ b/static/tabs.js
@@ -0,0 +1,63 @@
+"use strict";
+
+function handleTabber(tabber) {
+    let [tabs, contents] = getTabs(tabber);
+
+    for (let i in tabs) {
+        let tab = tabs[i];
+        let content = contents[i];
+        tab.addEventListener("click", function(e) {
+            let [currentTab, currentContent] = getCurrentTab(tabber);
+            if (currentTab) {
+                currentTab.classList.remove("wds-is-current");
+            }
+            if (currentContent) {
+                currentContent.classList.remove("wds-is-current");
+            }
+
+            tab.classList.add("wds-is-current");
+            content.classList.add("wds-is-current");
+            e.preventDefault();
+        });
+    }
+}
+
+for (let tabber of document.body.querySelectorAll(".wds-tabber")) {
+    handleTabber(tabber);
+}
+document.body.classList.remove("bw-tabs-nojs");
+
+
+
+function getTabs(tabber) {
+    let tabs = [];
+    let contents = [];
+
+    for (let i of tabber.querySelector(".wds-tabs__wrapper").querySelectorAll(".wds-tabs__tab")) {
+        tabs.push(i);
+    }
+    for (let i of tabber.children) {
+        if (!i.matches(".wds-tab__content")) {
+            continue;
+        }
+        contents.push(i);
+    }
+
+    return [tabs, contents];
+}
+
+function getCurrentTab(tabber) {
+    let tab = null;
+    let content = null;
+
+    tab = tabber.querySelector(".wds-tabs__wrapper").querySelector(".wds-tabs__tab.wds-is-current");
+    for (let i of tabber.children) {
+        if (!i.matches(".wds-tab__content.wds-is-current")) {
+            continue;
+        }
+        content = i;
+        break;
+    }
+
+    return [tab, content];
+}