fix(b-tabs): allow space to trigger tab activation when no-key-nav is enabled (fixes bootstrap-vue#4323) (bootstrap-vue#4326)

tmorehouse · web-flow · commit 731365b27f29 · 2019-10-30T19:46:50.000-03:00
diff --git a/src/components/tabs/README.md b/src/components/tabs/README.md
@@ -399,11 +399,11 @@ focus.
 Disable keyboard navigation by setting the prop `no-key-nav`. Behavior will now default to regular
 browser navigation with TAB key.
 
-| Keypress                        | Action                                                 |
-| ------------------------------- | ------------------------------------------------------ |
-| <kbd>TAB</kbd>                  | Move to the next tab button or control on the page     |
-| <kbd>SHIFT</kbd>+<kbd>TAB</kbd> | Move to the previous tab button or control on the page |
-| <kbd>ENTER</kbd>                | Activate current focused button's tab                  |
+| Keypress                             | Action                                                 |
+| ------------------------------------ | ------------------------------------------------------ |
+| <kbd>TAB</kbd>                       | Move to the next tab button or control on the page     |
+| <kbd>SHIFT</kbd>+<kbd>TAB</kbd>      | Move to the previous tab button or control on the page |
+| <kbd>ENTER</kbd> or <kbd>SPACE</kbd> | Activate current focused button's tab                  |
 
 ## Programmatically activating and deactivating tabs
 
diff --git a/src/components/tabs/tabs.js b/src/components/tabs/tabs.js
@@ -71,8 +71,10 @@ const BTabButtonHelper = /*#__PURE__*/ Vue.extend({
       if (type === 'click') {
         stop()
         this.$emit('click', evt)
-      } else if (type === 'keydown' && !this.noKeyNav && key === KeyCodes.SPACE) {
-        // In keynav mode, SPACE press will also trigger a click/select
+      } else if (type === 'keydown' && key === KeyCodes.SPACE) {
+        // For ARIA tabs the SPACE key will also trigger a click/select
+        // Even with keyboard navigation disabled, SPACE should "click" the button
+        // See: https://github.com/bootstrap-vue/bootstrap-vue/issues/4323
         stop()
         this.$emit('click', evt)
       } else if (type === 'keydown' && !this.noKeyNav) {
diff --git a/src/components/tabs/tabs.spec.js b/src/components/tabs/tabs.spec.js
@@ -454,6 +454,83 @@ describe('tabs', () => {
     wrapper.destroy()
   })
 
+  it('pressing space on tab activates the tab, and tab emits click event', async () => {
+    const App = Vue.extend({
+      render(h) {
+        return h(BTabs, { props: { value: 0, noKeyNav: true } }, [
+          h(BTab, { props: { title: 'one' } }, 'tab 0'),
+          h(BTab, { props: { title: 'two' } }, 'tab 1'),
+          h(BTab, { props: { title: 'three' } }, 'tab 2')
+        ])
+      }
+    })
+    const wrapper = mount(App)
+    expect(wrapper).toBeDefined()
+
+    await waitNT(wrapper.vm)
+    await waitRAF()
+    const tabs = wrapper.find(BTabs)
+    expect(tabs).toBeDefined()
+    expect(tabs.findAll(BTab).length).toBe(3)
+
+    const tab1 = tabs.findAll(BTab).at(0)
+    const tab2 = tabs.findAll(BTab).at(1)
+    const tab3 = tabs.findAll(BTab).at(2)
+
+    expect(wrapper.findAll('.nav-link')).toBeDefined()
+    expect(wrapper.findAll('.nav-link').length).toBe(3)
+
+    // Expect 1st tab (index 0) to be active
+    expect(tabs.vm.currentTab).toBe(0)
+    expect(tab1.vm.localActive).toBe(true)
+    expect(tab2.vm.localActive).toBe(false)
+    expect(tab3.vm.localActive).toBe(false)
+
+    // Try to set 2nd BTab to be active via space keypress
+    expect(tab2.emitted('click')).not.toBeDefined()
+    wrapper
+      .findAll('.nav-link')
+      .at(1)
+      .trigger('keydown.space')
+    await waitNT(wrapper.vm)
+    await waitRAF()
+    expect(tabs.vm.currentTab).toBe(1)
+    expect(tab1.vm.localActive).toBe(false)
+    expect(tab2.vm.localActive).toBe(true)
+    expect(tab3.vm.localActive).toBe(false)
+    expect(tab2.emitted('click')).toBeDefined()
+
+    // Try to set 3rd BTab to be active via space keypress
+    expect(tab3.emitted('click')).not.toBeDefined()
+    wrapper
+      .findAll('.nav-link')
+      .at(2)
+      .trigger('keydown.space')
+    await waitNT(wrapper.vm)
+    await waitRAF()
+    expect(tabs.vm.currentTab).toBe(2)
+    expect(tab1.vm.localActive).toBe(false)
+    expect(tab2.vm.localActive).toBe(false)
+    expect(tab3.vm.localActive).toBe(true)
+    expect(tab3.emitted('click')).toBeDefined()
+
+    // Try to set 1st BTab to be active via space keypress
+    expect(tab1.emitted('click')).not.toBeDefined()
+    wrapper
+      .findAll('.nav-link')
+      .at(0)
+      .trigger('keydown.space')
+    await waitNT(wrapper.vm)
+    await waitRAF()
+    expect(tabs.vm.currentTab).toBe(0)
+    expect(tab1.vm.localActive).toBe(true)
+    expect(tab2.vm.localActive).toBe(false)
+    expect(tab3.vm.localActive).toBe(false)
+    expect(tab1.emitted('click')).toBeDefined()
+
+    wrapper.destroy()
+  })
+
   it('key nav works', async () => {
     const App = Vue.extend({
       render(h) {
