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]

static/main.css

@@ -202,11 +202,11 @@ figcaption, .lightbox-caption, .thumbcaption {
     padding: 0;
 }
 
-/* show tabs always */
+/* show tabs if tabs.js isn't loaded */
-.wds-tabs__wrapper {
+.bw-tabs-nojs .wds-tabs__wrapper {
     display: none;
 }
-.wds-tab__content {
+.bw-tabs-nojs .wds-tab__content {
     display: block;
 }
 

static/tabs.js

@@ -0,0 +1,74 @@
+"use strict";
+
+let tabToFind = location.hash.length > 1 ? location.hash.substring(1) : null;
+for (let tabber of document.body.querySelectorAll(".wds-tabber")) {
+    let [tabs, contents] = getTabs(tabber);
+
+    for (let i in tabs) {
+        let tab = tabs[i];
+        let content = contents[i];
+
+        tab.addEventListener("click", function(e) {
+            setCurrentTab(tabber, tab, content);
+            e.preventDefault();
+        });
+        if (tab.dataset.hash === tabToFind) {
+            setCurrentTab(tabber, tab, content);
+        }
+    }
+}
+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];
+}
+
+function setCurrentTab(tabber, tab, content) {
+    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");
+    if (tab.dataset.hash) {
+        let fragment = "#" + tab.dataset.hash;
+        if (location.hash !== fragment) {
+            history.pushState(null, "", fragment);
+        }
+    }
+}