FEATURE: Show remaining count in category-drop (#25938)

When "lazy load categories" is enabled, the CategoryDrop component will
render at most 15 categories. If there are more categories, a "Show
more" link pointing to the categories page will be displayed.

app/assets/javascripts/discourse/app/models/category.js

@@ -400,6 +400,7 @@ export default class Category extends RestModel {
         categories: result["categories"].map((category) =>
           Site.current().updateCategory(category)
         ),
+        categoriesCount: result["categories_count"],
       };
     } else {
       return result["categories"].map((category) =>

app/assets/javascripts/discourse/tests/integration/components/select-kit/category-drop-test.js

@@ -68,7 +68,7 @@ module("Integration | Component | select-kit/category-drop", function (hooks) {
     const text = this.subject.header().label();
     assert.strictEqual(
       text,
-      I18n.t("category.all").toLowerCase(),
+      I18n.t("categories.categories_label"),
       "it uses the noneLabel"
     );
   });

app/assets/javascripts/select-kit/addon/components/category-drop-more-collection.gjs

@@ -0,0 +1,44 @@
+import Component from "@glimmer/component";
+import { hash } from "@ember/helper";
+import { LinkTo } from "@ember/routing";
+import { inject as service } from "@ember/service";
+import icon from "discourse-common/helpers/d-icon";
+import i18n from "discourse-common/helpers/i18n";
+import {
+  ALL_CATEGORIES_ID,
+  NO_CATEGORIES_ID,
+} from "select-kit/components/category-drop";
+
+export default class CategoryDropMoreCollection extends Component {
+  @service site;
+
+  tagName = "";
+
+  get moreCount() {
+    if (!this.args.selectKit.totalCount) {
+      return 0;
+    }
+
+    const currentCount = this.args.collection.content.filter(
+      (category) =>
+        category.id !== NO_CATEGORIES_ID && category.id !== ALL_CATEGORIES_ID
+    ).length;
+
+    return this.args.selectKit.totalCount - currentCount;
+  }
+
+  <template>
+    {{#if this.moreCount}}
+      <div class="category-drop-footer">
+        <span>{{i18n
+            "categories.plus_more_count"
+            (hash count=this.moreCount)
+          }}</span>
+        <LinkTo @route="discovery.categories">
+          {{i18n "categories.view_all"}}
+          {{icon "external-link-alt"}}
+        </LinkTo>
+      </div>
+    {{/if}}
+  </template>
+}

app/assets/javascripts/select-kit/addon/components/category-drop.js

@@ -9,18 +9,22 @@ import DiscourseURL, {
 } from "discourse/lib/url";
 import Category from "discourse/models/category";
 import I18n from "discourse-i18n";
+import CategoryDropMoreCollection from "select-kit/components/category-drop-more-collection";
 import CategoryRow from "select-kit/components/category-row";
 import ComboBoxComponent from "select-kit/components/combo-box";
+import { MAIN_COLLECTION } from "select-kit/components/select-kit";
 
 export const NO_CATEGORIES_ID = "no-categories";
 export const ALL_CATEGORIES_ID = "all-categories";
 
+const MORE_COLLECTION = "MORE_COLLECTION";
+
 export default ComboBoxComponent.extend({
   pluginApiIdentifiers: ["category-drop"],
   classNames: ["category-drop"],
   value: readOnly("category.id"),
   content: readOnly("categoriesWithShortcuts.[]"),
-  noCategoriesLabel: I18n.t("categories.no_subcategory"),
+  noCategoriesLabel: I18n.t("categories.no_subcategories"),
   navigateToEdit: false,
   editingCategory: false,
   editingCategoryTab: null,
@@ -44,6 +48,18 @@ export default ComboBoxComponent.extend({
     allowUncategorized: "allowUncategorized",
   },
 
+  init() {
+    this._super(...arguments);
+
+    this.insertAfterCollection(MAIN_COLLECTION, MORE_COLLECTION);
+  },
+
+  modifyComponentForCollection(collection) {
+    if (collection === MORE_COLLECTION) {
+      return CategoryDropMoreCollection;
+    }
+  },
+
   modifyComponentForRow() {
     return CategoryRow;
   },
@@ -85,6 +101,12 @@ export default ComboBoxComponent.extend({
         });
       }
 
+      // If there is a single shortcut, we can have a single "remove filter"
+      // option
+      if (shortcuts.length === 1 && shortcuts[0].id === ALL_CATEGORIES_ID) {
+        shortcuts[0].name = I18n.t("categories.remove_filter");
+      }
+
       return shortcuts;
     }
   ),
@@ -96,9 +118,17 @@ export default ComboBoxComponent.extend({
 
   modifyNoSelection() {
     if (this.selectKit.options.noSubcategories) {
-      return this.defaultItem(NO_CATEGORIES_ID, this.noCategoriesLabel);
+      return this.defaultItem(
+        NO_CATEGORIES_ID,
+        I18n.t("categories.no_subcategories")
+      );
     } else {
-      return this.defaultItem(ALL_CATEGORIES_ID, this.allCategoriesLabel);
+      return this.defaultItem(
+        ALL_CATEGORIES_ID,
+        this.selectKit.options.subCategory
+          ? I18n.t("categories.subcategories_label")
+          : I18n.t("categories.categories_label")
+      );
     }
   },
 
@@ -149,16 +179,23 @@ export default ComboBoxComponent.extend({
         parentCategoryId = -1;
       }
 
-      const results = (
-        await Category.asyncSearch(filter, {
+      const result = await Category.asyncSearch(filter, {
         parentCategoryId,
         includeUncategorized: this.siteSettings.allow_uncategorized_topics,
         includeAncestors: true,
-          limit: 15,
-        })
-      ).categories;
+        // Show all categories if possible (up to 18), otherwise show just
+        // first 15 and let CategoryDropMoreCollection show the "show more" link
+        limit: 18,
+      });
 
-      return this.shortcuts.concat(results);
+      const categories =
+        result.categoriesCount > 18
+          ? result.categories.slice(0, 15)
+          : result.categories;
+
+      this.selectKit.totalCount = result.categoriesCount;
+
+      return this.shortcuts.concat(categories);
     }
 
     const opts = {

app/assets/javascripts/select-kit/addon/components/tag-drop.js

@@ -1,8 +1,9 @@
 import { computed } from "@ember/object";
-import { equal, readOnly } from "@ember/object/computed";
-import { i18n, setting } from "discourse/lib/computed";
+import { readOnly } from "@ember/object/computed";
+import { setting } from "discourse/lib/computed";
 import DiscourseURL, { getCategoryAndTagUrl } from "discourse/lib/url";
 import { makeArray } from "discourse-common/lib/helpers";
+import I18n from "discourse-i18n";
 import ComboBoxComponent from "select-kit/components/combo-box";
 import FilterForMore from "select-kit/components/filter-for-more";
 import { MAIN_COLLECTION } from "select-kit/components/select-kit";
@@ -10,7 +11,8 @@ import TagsMixin from "select-kit/mixins/tags";
 
 export const NO_TAG_ID = "no-tags";
 export const ALL_TAGS_ID = "all-tags";
-export const NONE_TAG_ID = "none";
+
+export const NONE_TAG = "none";
 
 const MORE_TAGS_COLLECTION = "MORE_TAGS_COLLECTION";
 
@@ -45,8 +47,6 @@ export default ComboBoxComponent.extend(TagsMixin, {
     autoInsertNoneItem: false,
   },
 
-  noTagsSelected: equal("tagId", NONE_TAG_ID),
-
   init() {
     this._super(...arguments);
 
@@ -68,21 +68,19 @@ export default ComboBoxComponent.extend(TagsMixin, {
   },
 
   modifyNoSelection() {
-    if (this.noTagsSelected) {
-      return this.defaultItem(NO_TAG_ID, this.noTagsLabel);
+    if (this.tagId === NONE_TAG) {
+      return this.defaultItem(NO_TAG_ID, I18n.t("tagging.selector_no_tags"));
     } else {
-      return this.defaultItem(ALL_TAGS_ID, this.allTagsLabel);
+      return this.defaultItem(ALL_TAGS_ID, I18n.t("tagging.selector_tags"));
     }
   },
 
   modifySelection(content) {
-    if (this.tagId) {
-      if (this.noTagsSelected) {
-        content = this.defaultItem(NO_TAG_ID, this.noTagsLabel);
-      } else {
+    if (this.tagId === NONE_TAG) {
+      content = this.defaultItem(NO_TAG_ID, I18n.t("tagging.selector_no_tags"));
+    } else if (this.tagId) {
       content = this.defaultItem(this.tagId, this.tagId);
     }
-    }
 
     return content;
   },
@@ -91,10 +89,6 @@ export default ComboBoxComponent.extend(TagsMixin, {
     return this.tagId ? `tag-${this.tagId}` : "tag_all";
   }),
 
-  allTagsLabel: i18n("tagging.selector_all_tags"),
-
-  noTagsLabel: i18n("tagging.selector_no_tags"),
-
   modifyComponentForRow() {
     return "tag-row";
   },
@@ -102,15 +96,24 @@ export default ComboBoxComponent.extend(TagsMixin, {
   shortcuts: computed("tagId", function () {
     const shortcuts = [];
 
-    if (this.tagId !== NONE_TAG_ID) {
+    if (this.tagId !== NONE_TAG) {
       shortcuts.push({
         id: NO_TAG_ID,
-        name: this.noTagsLabel,
+        name: I18n.t("tagging.selector_no_tags"),
       });
     }
 
     if (this.tagId) {
-      shortcuts.push({ id: ALL_TAGS_ID, name: this.allTagsLabel });
+      shortcuts.push({
+        id: ALL_TAGS_ID,
+        name: I18n.t("tagging.selector_all_tags"),
+      });
+    }
+
+    // If there is a single shortcut, we can have a single "remove filter"
+    // option
+    if (shortcuts.length === 1 && shortcuts[0].id === ALL_TAGS_ID) {
+      shortcuts[0].name = I18n.t("tagging.selector_remove_filter");
     }
 
     return shortcuts;
@@ -173,7 +176,7 @@ export default ComboBoxComponent.extend(TagsMixin, {
   actions: {
     onChange(tagId, tag) {
       if (tagId === NO_TAG_ID) {
-        tagId = NONE_TAG_ID;
+        tagId = NONE_TAG;
       } else if (tagId === ALL_TAGS_ID) {
         tagId = null;
       } else if (tag && tag.targetTagId) {

app/assets/javascripts/select-kit/addon/components/tag-row.hbs

@@ -1 +1,5 @@
+{{#if this.isTag}}
   {{discourse-tag this.rowValue noHref=true count=this.item.count}}
+{{else}}
+  <span class="name">{{this.item.name}}</span>
+{{/if}}

app/assets/javascripts/select-kit/addon/components/tag-row.js

@@ -1,5 +1,11 @@
+import discourseComputed from "discourse-common/utils/decorators";
 import SelectKitRowComponent from "select-kit/components/select-kit/select-kit-row";
 
 export default SelectKitRowComponent.extend({
   classNames: ["tag-row"],
+
+  @discourseComputed("item")
+  isTag(item) {
+    return item.id !== "no-tags" && item.id !== "all-tags";
+  },
 });

app/assets/stylesheets/common/select-kit/category-drop.scss

@@ -10,6 +10,10 @@
       }
 
       .category-drop-header {
+        &[data-value=""] {
+          color: var(--primary-high);
+        }
+
         &.is-none .selected-name {
           color: inherit;
         }
@@ -42,6 +46,22 @@
           font-size: var(--font-down-1);
         }
       }
+
+      .category-drop-footer {
+        align-items: center;
+        border-top: 1px solid var(--primary-low);
+        display: flex;
+        font-size: var(--font-down-1);
+        height: 30px;
+        justify-content: space-between;
+        width: 100%;
+
+        a,
+        span {
+          color: var(--primary-high);
+          margin: 0 10px;
+        }
+      }
     }
   }
 }

app/assets/stylesheets/common/select-kit/tag-drop.scss

@@ -10,6 +10,10 @@
           font-weight: 700;
         }
       }
+
+      .tag-drop-header {
+        color: var(--primary-high);
+      }
     }
   }
 }

app/controllers/categories_controller.rb

@@ -392,6 +392,8 @@ class CategoriesController < ApplicationController
 
     categories = categories.where(parent_category_id: nil) if !include_subcategories
 
+    categories_count = categories.count
+
     categories = categories.limit(limit || MAX_CATEGORIES_LIMIT)
 
     Category.preload_user_fields!(guardian, categories)
@@ -409,18 +411,17 @@ class CategoriesController < ApplicationController
         ]
       end
 
+    response = {
+      categories_count: categories_count,
+      categories: serialize_data(categories, SiteCategorySerializer, scope: guardian),
+    }
+
     if include_ancestors
       ancestors = Category.secured(guardian).ancestors_of(categories.map(&:id))
-
-      render_json_dump(
-        {
-          categories: serialize_data(categories, SiteCategorySerializer, scope: guardian),
-          ancestors: serialize_data(ancestors, SiteCategorySerializer, scope: guardian),
-        },
-      )
-    else
-      render_serialized(categories, SiteCategorySerializer, root: :categories, scope: guardian)
+      response[:ancestors] = serialize_data(ancestors, SiteCategorySerializer, scope: guardian)
     end
+
+    render_json_dump(response)
   end
 
   private

config/locales/client.en.yml

@@ -1034,9 +1034,13 @@ en:
       "15": "Drafts"
 
     categories:
-      all: "all categories"
-      all_subcategories: "all"
-      no_subcategory: "none"
+      categories_label: "categories"
+      subcategories_label: "subcategories"
+      all_subcategories: "all subcategories"
+      no_subcategories: "no subcategories"
+      remove_filter: "remove filter"
+      plus_more_count: "+%{count} more"
+      view_all: "view all"
       category: "Category"
       category_list: "Display category list"
       reorder:
@@ -4353,8 +4357,10 @@ en:
     tagging:
       all_tags: "All tags"
       other_tags: "Other Tags"
+      selector_tags: "tags"
       selector_all_tags: "all tags"
       selector_no_tags: "no tags"
+      selector_remove_filter: "remove filter"
       tags: "Tags"
       choose_for_topic: "optional tags"
       choose_for_topic_required:

spec/system/discovery_breadcrumb_navigation_spec.rb

@@ -61,7 +61,7 @@ describe "Navigating with breadcrumbs", type: :system do
       expect(discovery.topic_list).to have_topic(c1_topic_tagged)
       expect(discovery.topic_list).to have_topics(count: 2)
 
-      expect(discovery.tag_drop).to have_selected_name("all tags")
+      expect(discovery.tag_drop).to have_selected_name("tags")
       discovery.tag_drop.select_row_by_value(tag.name)
 
       expect(discovery.topic_list).to have_topics(count: 1)
@@ -74,8 +74,8 @@ describe "Navigating with breadcrumbs", type: :system do
       expect(discovery.topic_list).to have_topic(c3_topic_tagged)
       expect(discovery.topic_list).to have_topics(count: 2)
 
-      expect(discovery.subcategory_drop).to have_selected_name("none")
-      expect(discovery.tag_drop).to have_selected_name("all tags")
+      expect(discovery.subcategory_drop).to have_selected_name("no subcategories")
+      expect(discovery.tag_drop).to have_selected_name("tags")
       discovery.tag_drop.select_row_by_value(tag.name)
 
       expect(page).to have_current_path(