Announce "signing in" state on login screen

CHANGELOG-WIP.md

@@ -17,6 +17,7 @@
 - Improved the color contrast and keyboard control of the Customize Sources modal. ([#12233](https://github.com/craftcms/cms/pull/12233))
 - Improved info icons for screen readers. ([#12272](https://github.com/craftcms/cms/pull/12272))
 - Removed input autofocussing throughout the control panel. ([#12324](https://github.com/craftcms/cms/discussions/12324), [#12332](https://github.com/craftcms/cms/pull/12332))
+- Improved the login screen for screen readers. ([#12386](https://github.com/craftcms/cms/pull/12386))
 
 ### Administration
 - Conditional layout components are now identified using a condition icon within field layout designers. ([#12250](https://github.com/craftcms/cms/issues/12250))
@@ -67,6 +68,7 @@
 - Deprecated `craft\queue\jobs\GeneratePendingTransforms`. `GenerateImageTransform` should be used instead. ([#12340](https://github.com/craftcms/cms/pull/12340))
 - Added `Craft.Accordion`. ([#12189](https://github.com/craftcms/cms/pull/12189))
 - Added `Craft.ElementFieldSettings`.
+- Added `Garnish.MultiFunctionBtn`.
 - Deprecated `Craft.CategorySelectInput`. `Craft.BaseElementSelectInput` should be used instead. ([#11749](https://github.com/craftcms/cms/pull/11749))
 
 ### System

src/templates/_includes/forms/button.twig

@@ -1,4 +1,8 @@
 {% set spinner = spinner ?? false -%}
+{% set busyMessage = busyMessage ?? false %}
+{% set failureMessage = failureMessage ?? false %}
+{% set retryMessage = retryMessage ?? false %}
+{% set successMessage = successMessage ?? false %}
 {% set label = label ?? null %}
 {% set attributes = {
     type: type ?? 'button',
@@ -7,16 +11,27 @@
         'btn',
         not label ? 'btn-empty' : null,
     ]|filter),
+    data: {
+        'busy-message': busyMessage,
+        'failure-message': failureMessage,
+        'retry-message': retryMessage,
+        'success-message': successMessage,
+    }
 }|merge(attributes ?? {}) -%}
 
 {% apply spaceless %}
+    {% if spinner %}
+        <div role="status" class="visually-hidden"></div>
+    {% endif %}
     {% tag 'button' with attributes %}
         {{ label ? tag('div', {
             class: 'label',
             text: label,
         }) }}
         {% if spinner %}
-            <div class="spinner spinner-absolute"></div>
+            <div class="spinner spinner-absolute">
+                <span class="visually-hidden">{{ 'Loading'|t('app') }}</span>
+            </div>
         {% endif %}
     {% endtag %}
 {% endapply -%}

src/templates/login.twig

@@ -94,6 +94,10 @@
                         id: 'submit',
                         label: 'Sign in'|t('app'),
                         spinner: true,
+                        busyMessage: 'Signing in'|t('app'),
+                        successMessage: 'Signed in'|t('app'),
+                        failureMessage: 'Sign in unsuccessful'|t('app'),
+                        retryMessage: 'Try again'|t('app'),
                     }) }}
                 </div>
 
@@ -103,7 +107,7 @@
                 </div>
             </form>
 
-            <div id="login-errors" role="alert">
+            <div id="login-errors" role="status">
             </div>
 
             <a id="poweredby" href="http://craftcms.com/" title="{{ 'Powered by Craft CMS'|t('app') }}" aria-label="Craft CMS">

src/translations/en/app.php

@@ -1328,10 +1328,13 @@
     'Sign in as user' => 'Sign in as user',
     'Sign in as {user}' => 'Sign in as {user}',
     'Sign in' => 'Sign in',
+    'Sign in unsuccessful' => 'Sign in unsuccessful',
     'Sign into Craft ID' => 'Sign into Craft ID',
     'Sign out from Craft ID' => 'Sign out from Craft ID',
     'Sign out now' => 'Sign out now',
     'Sign out' => 'Sign out',
+    'Signed in' => 'Signed in',
+    'Signing in' => 'Signing in',
     'Similar issues on GitHub' => 'Similar issues on GitHub',
     'Similar questions on Stack Exchange' => 'Similar questions on Stack Exchange',
     'Single' => 'Single',

src/web/assets/garnish/src/Garnish.js

@@ -14,6 +14,7 @@ import HUD from './HUD.js';
 import MenuBtn from './MenuBtn.js';
 import MixedInput from './MixedInput.js';
 import Modal from './Modal.js';
+import MultiFunctionBtn from './MultiFunctionBtn.js';
 import NiceText from './NiceText.js';
 import Select from './Select.js';
 import SelectMenu from './SelectMenu.js';
@@ -907,6 +908,7 @@ Object.assign(Garnish, {
   MenuBtn,
   MixedInput,
   Modal,
+  MultiFunctionBtn,
   NiceText,
   Select,
   SelectMenu,

src/web/assets/garnish/src/MultiFunctionBtn.js

@@ -0,0 +1,114 @@
+import Garnish from './Garnish.js';
+import Base from './Base.js';
+import $ from 'jquery';
+
+/**
+ * Multi-Function Button
+ */
+export default Base.extend(
+  {
+    $btn: null,
+    $btnLabel: null,
+    $liveRegion: null,
+
+    defaultMessage: null,
+    busyMessage: null,
+    failureMessage: null,
+    retryMessage: null,
+    successMessage: null,
+
+    init: function (button, settings) {
+      this.setSettings(settings, Garnish.MultiFunctionBtn.defaults);
+      this.$btn = $(button);
+
+      // Is this already a multi-function button?
+      if (this.$btn.data('multifunction-btn')) {
+        console.warn(
+          'Double-instantiating a multi-function button on an element'
+        );
+        this.$btn.data('multifunction-btn').destroy();
+      }
+
+      this.$btnLabel = this.$btn.find('.label');
+      this.defaultMessage = this.$btnLabel.text();
+
+      if (this.$btn.prev().attr('role') === 'status') {
+        this.$liveRegion = this.$btn.prev();
+      }
+
+      this.busyMessage = this.$btn.data('busy-message');
+      this.failureMessage = this.$btn.data('failure-message');
+      this.retryMessage = this.$btn.data('retry-message');
+      this.successMessage = this.$btn.data('success-message');
+    },
+
+    busyEvent: function () {
+      this.$btn.addClass(this.settings.busyClass);
+
+      if (this.busyMessage) {
+        this.updateMessages(this.busyMessage, false);
+      }
+    },
+
+    failureEvent: function () {
+      this.endBusyState();
+
+      if (!this.failureMessage && !this.retryMessage) return;
+
+      if (this.failureMessage) {
+        this.updateMessages(this.failureMessage);
+      }
+
+      if (this.retryMessage) {
+        // If there was a failure message, ensure there's a delay before showing retry message
+        if (this.failureMessage) {
+          setTimeout(() => {
+            this.updateMessages(this.retryMessage);
+          }, this.settings.failureMessageDuration);
+        } else {
+          this.updateMessages(this.retryMessage);
+        }
+      }
+    },
+
+    successEvent: function () {
+      this.endBusyState();
+
+      if (this.successMessage) {
+        this.updateMessages(this.successMessage);
+      }
+    },
+
+    updateMessages: function (message, updateLabel = true) {
+      this.$liveRegion.text(message);
+
+      if (updateLabel) {
+        this.$btnLabel.text(message);
+      }
+
+      // Empty live region so a SR user navigating with virtual cursor doesn't find outdated message
+      setTimeout(() => {
+        // Bail out if there's now a different message in the live region
+        if (this.$liveRegion.text() !== message) return;
+
+        this.$liveRegion.empty();
+      }, this.settings.clearLiveRegionTimeout);
+    },
+
+    endBusyState: function () {
+      this.$btn.removeClass(this.settings.busyClass);
+    },
+
+    destroy: function () {
+      this.$btn.removeData('multifunction-btn');
+      this.base();
+    },
+  },
+  {
+    defaults: {
+      busyClass: 'loading',
+      clearLiveRegionTimeout: 2500,
+      failureMessageDuration: 3000,
+    },
+  }
+);