Configure: Home and End navigation

By default, continue to ignore `Home` and `End` navigation keys.

When `optionalNavigationKeys: ["Home", "End"]` is passed as a
configuration object, treat them as valid navigation keys.

Author: seanpdoyle

src/index.ts

@@ -1,4 +1,5 @@
 const ctrlBindings = !!navigator.userAgent.match(/Macintosh/)
+type OptionalNavigationKeys = 'Home' | 'End'
 
 export default class Combobox {
   isComposing: boolean
@@ -7,11 +8,17 @@ export default class Combobox {
   keyboardEventHandler: (event: KeyboardEvent) => void
   compositionEventHandler: (event: Event) => void
   inputHandler: (event: Event) => void
+  optionalNavigationKeys: OptionalNavigationKeys[]
 
-  constructor(input: HTMLTextAreaElement | HTMLInputElement, list: HTMLElement) {
+  constructor(
+    input: HTMLTextAreaElement | HTMLInputElement,
+    list: HTMLElement,
+    options: {optionalNavigationKeys: OptionalNavigationKeys[]} = {optionalNavigationKeys: []}
+  ) {
     this.input = input
     this.list = list
     this.isComposing = false
+    this.optionalNavigationKeys = options.optionalNavigationKeys
 
     if (!list.id) {
       list.id = `combobox-${Math.random()

test/test.js

@@ -138,14 +138,6 @@ describe('combobox-nav', function() {
       assert.equal(options[5].getAttribute('aria-selected'), 'true')
       assert.equal(input.getAttribute('aria-activedescendant'), 'link')
 
-      press(input, 'Home')
-      assert.equal(options[0].getAttribute('aria-selected'), 'true')
-      assert.equal(input.getAttribute('aria-activedescendant'), 'baymax')
-
-      press(input, 'End')
-      assert.equal(options[5].getAttribute('aria-selected'), 'true')
-      assert.equal(input.getAttribute('aria-activedescendant'), 'link')
-
       press(input, 'Enter')
       assert.equal(expectedTargets.length, 2)
       assert.equal(expectedTargets[0], 'hubot')
@@ -230,4 +222,68 @@ describe('combobox-nav', function() {
       assert.equal(list.scrollTop, 36)
     })
   })
+
+  describe('with Home key navigation enabled', function() {
+    let input, list, options, combobox
+    beforeEach(function() {
+      document.body.innerHTML = `
+        <input type="text">
+        <ul role="listbox" id="list-id">
+          <li id="baymax" role="option">Baymax</li>
+          <li><del>BB-8</del></li>
+          <li id="hubot" role="option">Hubot</li>
+          <li id="r2-d2" role="option">R2-D2</li>
+          <li id="johnny-5" hidden role="option">Johnny 5</li>
+          <li id="wall-e" role="option" aria-disabled="true">Wall-E</li>
+          <li><a href="#link" role="option" id="link">Link</a></li>
+        </ul>
+      `
+      input = document.querySelector('input')
+      list = document.querySelector('ul')
+      options = document.querySelectorAll('[role=option]')
+      combobox = new Combobox(input, list, {optionalNavigationKeys: ['Home']})
+      combobox.start()
+    })
+
+    it('updates attributes on keyboard events', function() {
+      press(input, 'ArrowDown')
+      press(input, 'ArrowDown')
+
+      assert.equal(options[1].getAttribute('aria-selected'), 'true')
+      assert.equal(input.getAttribute('aria-activedescendant'), 'hubot')
+
+      press(input, 'Home')
+      assert.equal(options[0].getAttribute('aria-selected'), 'true')
+      assert.equal(input.getAttribute('aria-activedescendant'), 'baymax')
+    })
+  })
+
+  describe('with End key navigation enabled', function() {
+    let input, list, options, combobox
+    beforeEach(function() {
+      document.body.innerHTML = `
+        <input type="text">
+        <ul role="listbox" id="list-id">
+          <li id="baymax" role="option">Baymax</li>
+          <li><del>BB-8</del></li>
+          <li id="hubot" role="option">Hubot</li>
+          <li id="r2-d2" role="option">R2-D2</li>
+          <li id="johnny-5" hidden role="option">Johnny 5</li>
+          <li id="wall-e" role="option" aria-disabled="true">Wall-E</li>
+          <li><a href="#link" role="option" id="link">Link</a></li>
+        </ul>
+      `
+      input = document.querySelector('input')
+      list = document.querySelector('ul')
+      options = document.querySelectorAll('[role=option]')
+      combobox = new Combobox(input, list, {optionalNavigationKeys: ['End']})
+      combobox.start()
+    })
+
+    it('updates attributes on keyboard events', function() {
+      press(input, 'End')
+      assert.equal(options[5].getAttribute('aria-selected'), 'true')
+      assert.equal(input.getAttribute('aria-activedescendant'), 'link')
+    })
+  })
 })