Support `Home` and `End` keys in tabs (#38498)

* Support `Home` and `End` keys in tabs

* Update tab.js

* simplify tests

* Update navs-tabs.md

* Update .bundlewatch.config.json

---------

Co-authored-by: Patrick H. Lauke <[email protected]>
Co-authored-by: XhmikosR <[email protected]>
Co-authored-by: Mark Otto <[email protected]>

1 files changed, 13 insertions, 3 deletions

diff --git a/js/src/tab.js b/js/src/tab.js
index d9993d56e..5598e15c0 100644
--- a/js/src/tab.js
+++ b/js/src/tab.js
@@ -30,6 +30,8 @@ const ARROW_LEFT_KEY = 'ArrowLeft'
 const ARROW_RIGHT_KEY = 'ArrowRight'
 const ARROW_UP_KEY = 'ArrowUp'
 const ARROW_DOWN_KEY = 'ArrowDown'
+const HOME_KEY = 'Home'
+const END_KEY = 'End'
 
 const CLASS_NAME_ACTIVE = 'active'
 const CLASS_NAME_FADE = 'fade'
@@ -151,14 +153,22 @@ class Tab extends BaseComponent {
   }
 
   _keydown(event) {
-    if (!([ARROW_LEFT_KEY, ARROW_RIGHT_KEY, ARROW_UP_KEY, ARROW_DOWN_KEY].includes(event.key))) {
+    if (!([ARROW_LEFT_KEY, ARROW_RIGHT_KEY, ARROW_UP_KEY, ARROW_DOWN_KEY, HOME_KEY, END_KEY].includes(event.key))) {
       return
     }
 
     event.stopPropagation()// stopPropagation/preventDefault both added to support up/down keys without scrolling the page
     event.preventDefault()
-    const isNext = [ARROW_RIGHT_KEY, ARROW_DOWN_KEY].includes(event.key)
-    const nextActiveElement = getNextActiveElement(this._getChildren().filter(element => !isDisabled(element)), event.target, isNext, true)
+
+    const children = this._getChildren().filter(element => !isDisabled(element))
+    let nextActiveElement
+
+    if ([HOME_KEY, END_KEY].includes(event.key)) {
+      nextActiveElement = children[event.key === HOME_KEY ? 0 : children.length - 1]
+    } else {
+      const isNext = [ARROW_RIGHT_KEY, ARROW_DOWN_KEY].includes(event.key)
+      nextActiveElement = getNextActiveElement(children, event.target, isNext, true)
+    }
 
     if (nextActiveElement) {
       nextActiveElement.focus({ preventScroll: true })