Add tooltip to search

You can add collection filters to a dashboard and then use them in the
search bar on the index page. eg. `email:jared@example.com`

However, these collection filters are not discoverable. You have to know
about them already to know how to use them.

This change introduces a tooltip which lists the available collection
filters, allowing all users to discover what is available.

The tooltip icon is `question-mark-circle` from [heroicons] (MIT licensed)

We use [anchor positioning] with a [polyfill] to position the [popover] by
the tooltip.

Some basic JavaScript is introduced to show/hide the popover on hover to
ensure the tooltip behaviour works as expected for a tooltip.

I've had a first pass at the design, borrowing from existing styles. But
I don't feel strongly about it if we want to go in a different direction.

Do we want an option to disable the tooltip even if there are collection
filters?

[heroicons]: https://heroicons.com/solid
[anchor positioning]: https://developer.mozilla.org/en-US/docs/Web/CSS/position-anchor
[polyfill]: https://github.com/oddbird/css-anchor-positioning
[popover]: https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/popover

Closes #2750

Author: jared-thoughtbot

app/assets/builds/administrate/application.css

@@ -22172,6 +22172,14 @@
   // app/assets/javascripts/administrate/controllers/index.js
   application.register("select", select_controller_default);
   application.register("table", table_controller_default);
+  var searchPopover = document.querySelector("[popover][id='search-tooltip']");
+  var searchTooltip = document.querySelector("button[popovertarget='search-tooltip']");
+  searchTooltip.addEventListener("mouseenter", () => {
+    searchPopover.showPopover();
+  });
+  searchTooltip.addEventListener("mouseleave", () => {
+    searchPopover.hidePopover();
+  });
 })();
 /*! Bundled license information:
 

app/assets/builds/administrate/application.css.map

@@ -5,3 +5,13 @@ import TableController from "./table_controller";
 
 application.register("select", SelectController);
 application.register("table", TableController);
+
+// Bug: Visit another page and come back to this page, the mouesover popover will not work
+const searchPopover = document.querySelector("[popover][id='search-tooltip']");
+const searchTooltip = document.querySelector("button[popovertarget='search-tooltip']");
+searchTooltip.addEventListener("mouseenter", () => {
+  searchPopover.showPopover();
+});
+searchTooltip.addEventListener("mouseleave", () => {
+  searchPopover.hidePopover();
+});

app/assets/builds/administrate/application.js

@@ -61,3 +61,15 @@ button,
 .button--nav {
   margin-bottom: $base-spacing;
 }
+
+.button--tooltip {
+  background: none;
+	color: inherit;
+	border: none;
+	cursor: pointer;
+  padding: 0;
+
+  &:hover {
+    background-color: unset !important;
+  }
+}

app/assets/builds/administrate/application.js.map

@@ -44,3 +44,38 @@ $search-icon-size: 1rem;
     fill: $action-color;
   }
 }
+
+.search__tooltip {
+  margin-right: 2rem;
+  anchor-name: --tooltip-anchor;
+
+  svg {
+    height: 24px;
+    width: 24px;
+    fill: $grey-5;
+
+    &:hover {
+      fill: $action-color;
+    }
+  }
+}
+
+.search__tooltip-popover {
+  position-anchor: --tooltip-anchor;
+  position: fixed;
+  top: anchor(bottom);
+  left: anchor(center);
+  transform: translateX(-50%);
+  margin: 1rem;
+  
+  padding: 2rem;
+  border-color: $blue;
+  background-color: $blue;
+  color: $white;
+  border-radius: $base-border-radius;
+  width: max-content;
+}
+
+.search__tooltip-popover-value {
+  opacity: 0.5;
+}

app/assets/javascripts/administrate/controllers/index.js

@@ -10,12 +10,14 @@ def index
       resources = order.apply(resources)
       resources = paginate_resources(resources)
       page = Administrate::Page::Collection.new(dashboard, order: order)
+      filters = Administrate::Search.new(scoped_resource, dashboard, search_term).valid_filters
 
       render locals: {
         resources: resources,
         search_term: search_term,
         page: page,
-        show_search_bar: show_search_bar?
+        show_search_bar: show_search_bar?,
+        filters: filters
       }
     end
 

app/assets/stylesheets/administrate/components/_buttons.scss

@@ -10,4 +10,8 @@
   <symbol id="icon-up-caret" viewBox="0 0 48 48">
     <path d="M2.988 33.02c-1.66 0-1.943-.81-.618-1.824l20-15.28c.878-.672 2.31-.67 3.188 0l20.075 15.288c1.316 1.003 1.048 1.816-.62 1.816H2.987z" />
   </symbol>
+
+  <symbol id="icon-question-mark" viewBox="0 0 24 24">
+    <path fill-rule="evenodd" d="M2.25 12c0-5.385 4.365-9.75 9.75-9.75s9.75 4.365 9.75 9.75-4.365 9.75-9.75 9.75S2.25 17.385 2.25 12Zm11.378-3.917c-.89-.777-2.366-.777-3.255 0a.75.75 0 0 1-.988-1.129c1.454-1.272 3.776-1.272 5.23 0 1.513 1.324 1.513 3.518 0 4.842a3.75 3.75 0 0 1-.837.552c-.676.328-1.028.774-1.028 1.152v.75a.75.75 0 0 1-1.5 0v-.75c0-1.279 1.06-2.107 1.875-2.502.182-.088.351-.199.503-.331.83-.727.83-1.857 0-2.584ZM12 18a.75.75 0 1 0 0-1.5.75.75 0 0 0 0 1.5Z" clip-rule="evenodd" />
+  </symbol>
 </svg>

app/assets/stylesheets/administrate/components/_search.scss

@@ -2,6 +2,16 @@
   <%= display_resource_name(page.resource_name) %>
 <% end %>
 
+<%#
+  TODO: Move where this polyfill lives. Where?
+  Also, do we want to import the polyfill js directly instead of linking to unpkg.com?
+ %>
+<script type="module">
+  if (!("anchorName" in document.documentElement.style)) {
+    import("https://unpkg.com/@oddbird/css-anchor-positioning");
+  }
+</script>
+
 <header class="main-content__header">
   <h1 class="main-content__page-title" id="page-title">
     <%= content_for(:title) %>
@@ -15,6 +25,23 @@
       search_term: search_term,
       resource_name: display_resource_name(page.resource_name)
     ) %>
+
+    <% if filters.any? %>
+      <button popovertarget="search-tooltip" class="button--tooltip search__tooltip">
+        <svg role="img">
+          <use xlink:href="#icon-question-mark" />
+        </svg>
+      </button>
+
+      <div popover id="search-tooltip" role="tooltip" class="search__tooltip-popover">
+        <p><strong>Use filters to refine your search</strong></p>
+        <ul>
+          <% filters.keys.each do |filter_key| %>
+          <li><%= filter_key %>:<span class="search__tooltip-popover-value">&lt;value&gt;</span></li>
+          <% end %>
+        </ul>
+      </div>
+    <% end %>
   <% end %>
 
   <div>

app/controllers/administrate/application_controller.rb

@@ -29,6 +29,7 @@ It renders the `_table` partial to display details about the resources.
     search_term: search_term,
     page: page,
     show_search_bar: show_search_bar,
+    filters: filters,
   )
 %>
 

app/views/administrate/application/_icons.html.erb

@@ -63,6 +63,14 @@ def run
       end
     end
 
+    def valid_filters
+      if @dashboard.class.const_defined?(:COLLECTION_FILTERS)
+        @dashboard.class.const_get(:COLLECTION_FILTERS).stringify_keys
+      else
+        {}
+      end
+    end
+
     private
 
     def apply_filter(filter, filter_param, resources)
@@ -116,14 +124,6 @@ def search_results(resources)
         .where(query_template, *query_values)
     end
 
-    def valid_filters
-      if @dashboard.class.const_defined?(:COLLECTION_FILTERS)
-        @dashboard.class.const_get(:COLLECTION_FILTERS).stringify_keys
-      else
-        {}
-      end
-    end
-
     def attribute_types
       @dashboard.class.const_get(:ATTRIBUTE_TYPES)
     end

app/views/administrate/application/_index_header.html.erb

@@ -25,6 +25,54 @@ def have_a_search_bar
     end
   end
 
+  describe "search bar tooltip" do
+    def have_a_search_tooltip
+      have_css("button[popovertarget=search-tooltip]")
+    end
+
+    def search_tooltip_icon
+      find("button[popovertarget=search-tooltip]")
+    end
+
+    it "is visible when the current dashboard has collection filters" do
+      visit admin_customers_path
+
+      expect(page).to have_a_search_tooltip
+    end
+
+    context "when clicked" do
+      it "shows a popover with the available filters" do
+        visit admin_customers_path
+
+        search_tooltip_icon.click
+
+        expect(page).to have_content("Use filters to refine your search")
+        expect(page).to have_content("vip:<value>")
+        expect(page).to have_content("kind:<value>")
+      end
+    end
+
+    it "is hidden when the current dashboard has no collection filters" do
+      stub_const("CustomerDashboard::COLLECTION_FILTERS", {})
+
+      visit admin_customers_path
+
+      expect(page).not_to have_a_search_tooltip
+    end
+
+    it "is hidden when nothing is searchable in the current dashboard" do
+      CustomerDashboard::ATTRIBUTE_TYPES.each do |_name, field_class|
+        allow(field_class).to(
+          receive(:searchable?).and_return(false)
+        )
+      end
+
+      visit admin_customers_path
+
+      expect(page).not_to have_a_search_tooltip
+    end
+  end
+
   scenario "admin searches for customer by email", :js do
     query = "bar@baz.com"
     perfect_match = create(:customer, email: "bar@baz.com")