A11Y: Signal the toggle header can reorder table elements. (#18597)

While navigating the table, indicate what the button does and if the user pressed it or not. Also, don't lose focus after reordering elements.

app/assets/javascripts/admin/addon/templates/users-list-show.hbs

@@ -15,8 +15,9 @@
 
 <LoadMore @class="users-list-container" @selector=".users-list tr" @action={{action "loadMore"}}>
   {{#if this.model}}
-    <table class="table users-list grid">
+    <table class="table users-list grid" role="table" aria-label={{this.title}}>
       <thead>
+        <tr>
           <TableHeaderToggle @field="username" @labelKey="username" @order={{this.order}} @asc={{this.asc}} @automatic={{true}} />
           <TableHeaderToggle @class={{if this.showEmails "" "hidden"}} @field="email" @labelKey="email" @order={{this.order}} @asc={{this.asc}} @automatic={{true}} />
           <TableHeaderToggle @field="last_emailed" @labelKey="admin.users.last_emailed" @order={{this.order}} @asc={{this.asc}} @automatic={{true}} />
@@ -31,6 +32,7 @@
             <th>{{i18n "admin.users.approved"}}</th>
           {{/if}}
           <th>&nbsp;</th>
+        </tr>
       </thead>
       <tbody>
         {{#each this.model as |user|}}

app/assets/javascripts/discourse/app/components/table-header-toggle.js

@@ -1,18 +1,32 @@
 import Component from "@ember/component";
 import { iconHTML } from "discourse-common/lib/icon-library";
 import { htmlSafe } from "@ember/template";
+import { schedule } from "@ember/runloop";
+import discourseComputed from "discourse-common/utils/decorators";
+import I18n from "I18n";
 
 export default Component.extend({
   tagName: "th",
   classNames: ["sortable"],
-  attributeBindings: ["title", "colspan"],
+  attributeBindings: ["title", "colspan", "ariaSort:aria-sort", "role"],
+  role: "columnheader",
   labelKey: null,
   chevronIcon: null,
   columnIcon: null,
   translated: false,
   automatic: false,
   onActiveRender: null,
+  pressedState: null,
+  ariaLabel: null,
 
+  @discourseComputed("order", "field", "asc")
+  ariaSort() {
+    if (this.order === this.field) {
+      return this.asc ? "ascending" : "descending";
+    } else {
+      return "none";
+    }
+  },
   toggleProperties() {
     if (this.order === this.field) {
       this.set("asc", this.asc ? null : true);
@@ -43,10 +57,48 @@ export default Component.extend({
     }
     this.set("id", `table-header-toggle-${this.field.replace(/\s/g, "")}`);
     this.toggleChevron();
+    this._updateA11yAttributes();
   },
   didRender() {
     if (this.onActiveRender && this.chevronIcon) {
       this.onActiveRender(this.element);
     }
   },
+  _updateA11yAttributes() {
+    let criteria = "";
+    const pressed = this.order === this.field;
+
+    if (this.icon === "heart") {
+      criteria += `${I18n.t("likes_lowercase", { count: 2 })} `;
+    }
+
+    if (this.translated) {
+      criteria += this.field;
+    } else {
+      const labelKey = this.labelKey || `directory.${this.field}`;
+
+      criteria += I18n.t(labelKey + "_long", {
+        defaultValue: I18n.t(labelKey),
+      });
+    }
+
+    this.set("ariaLabel", I18n.t("directory.sort.label", { criteria }));
+
+    if (pressed) {
+      if (this.asc) {
+        this.set("pressedState", "mixed");
+      } else {
+        this.set("pressedState", "true");
+      }
+
+      this._focusHeader();
+    } else {
+      this.set("pressedState", "false");
+    }
+  },
+  _focusHeader() {
+    schedule("afterRender", () => {
+      document.getElementById(this.id)?.focus();
+    });
+  },
 });

app/assets/javascripts/discourse/app/templates/components/table-header-toggle.hbs

@@ -2,7 +2,9 @@
   class="header-contents"
   id={{this.id}}
   role="button"
-  tabindex="0">
+  tabindex="0"
+  aria-label={{this.ariaLabel}}
+  aria-pressed={{this.pressedState}}>
   {{directory-table-header-title field=this.field labelKey=this.labelKey icon=this.icon translated=this.translated}}
   {{this.chevronIcon}}
 </span>

config/locales/client.en.yml

@@ -720,6 +720,8 @@ en:
         reset_to_default: "Reset to default"
       group:
         all: "all groups"
+      sort:
+        label: "Sort by %{criteria}"
 
     group_histories:
       actions: