feat(web): keyboard access for search dropdown, combobox fixes (#8079)

* feat(web): keyboard access for search dropdown

Also: fixing cosmetic issue with combobox component.

* fix: revert changing required field

* fix: create new focusChange action

* fix: combobox usability improvements

* handle escape key on the clear button
* move focus to input when clear button is clicked
* leave the dropdown closed if the user has already closed the dropdown and tabs over to the clear button
* activate the combobox if a user tabs backwards onto the clear button

* rename focusChange to focusOutside

* small fixes

* do not activate combobox on backwards tabbing
* simplify classes in "No results" option
* prevent dropdown option from being preselected when clear button is
  clicked

* fix: remove unused event dispatcher interface

web/src/lib/components/shared-components/combobox.svelte

@@ -18,6 +18,7 @@
   import type { FormEventHandler } from 'svelte/elements';
   import { shortcuts } from '$lib/utils/shortcut';
   import { clickOutside } from '$lib/utils/click-outside';
+  import { focusOutside } from '$lib/utils/focus-outside';
 
   /**
    * Unique identifier for the combobox.
@@ -40,6 +41,7 @@
   let searchQuery = selectedOption?.label || '';
   let selectedIndex: number | undefined;
   let optionRefs: HTMLElement[] = [];
+  let input: HTMLInputElement;
   const inputId = `combobox-${id}`;
   const listboxId = `listbox-${id}`;
 
@@ -51,7 +53,6 @@
 
   const dispatch = createEventDispatcher<{
     select: ComboBoxOption | undefined;
-    click: void;
   }>();
 
   const activate = () => {
@@ -101,6 +102,8 @@
   };
 
   const onClear = () => {
+    input?.focus();
+    selectedIndex = undefined;
     selectedOption = undefined;
     searchQuery = '';
     dispatch('select', selectedOption);
@@ -111,11 +114,16 @@
 <div
   class="relative w-full dark:text-gray-300 text-gray-700 text-base"
   use:clickOutside={{ onOutclick: deactivate }}
-  on:focusout={(e) => {
-    if (e.relatedTarget instanceof Node && !e.currentTarget.contains(e.relatedTarget)) {
-      deactivate();
-    }
-  }}
+  use:focusOutside={{ onFocusOut: deactivate }}
+  use:shortcuts={[
+    {
+      shortcut: { key: 'Escape' },
+      onShortcut: (event) => {
+        event.stopPropagation();
+        closeDropdown();
+      },
+    },
+  ]}
 >
   <div>
     {#if isActive}
@@ -133,6 +141,7 @@
       aria-controls={listboxId}
       aria-expanded={isOpen}
       autocomplete="off"
+      bind:this={input}
       class:!pl-8={isActive}
       class:!rounded-b-none={isOpen}
       class:cursor-pointer={!isActive}
@@ -213,9 +222,7 @@
           role="option"
           aria-selected={selectedIndex === 0}
           aria-disabled={true}
-          class:bg-gray-100={selectedIndex === 0}
-          class:dark:bg-gray-700={selectedIndex === 0}
-          class="text-left w-full px-4 py-2 hover:bg-gray-100 dark:hover:bg-gray-700 cursor-default"
+          class="text-left w-full px-4 py-2 hover:bg-gray-100 dark:hover:bg-gray-700 cursor-default aria-selected:bg-gray-100 aria-selected:dark:bg-gray-700"
           id={`${listboxId}-${0}`}
           on:click={() => closeDropdown()}
         >

web/src/lib/components/shared-components/search-bar/search-bar.svelte

@@ -12,6 +12,7 @@
   import { getMetadataSearchQuery } from '$lib/utils/metadata-search';
   import { handlePromiseError } from '$lib/utils';
   import { shortcut } from '$lib/utils/shortcut';
+  import { focusOutside } from '$lib/utils/focus-outside';
 
   export let value = '';
   export let grayTheme: boolean;
@@ -94,7 +95,7 @@
   }}
 />
 
-<div class="w-full relative" use:clickOutside={{ onOutclick: onFocusOut }}>
+<div class="w-full relative" use:clickOutside={{ onOutclick: onFocusOut }} use:focusOutside={{ onFocusOut }}>
   <form
     draggable="false"
     autocomplete="off"
@@ -127,6 +128,7 @@
         bind:value
         bind:this={input}
         on:click={onFocusIn}
+        on:focus={onFocusIn}
         disabled={showFilter}
         use:shortcut={{
           shortcut: { key: 'Escape' },

web/src/lib/utils/focus-outside.ts

@@ -0,0 +1,21 @@
+interface Options {
+  onFocusOut?: () => void;
+}
+
+export function focusOutside(node: HTMLElement, options: Options = {}) {
+  const { onFocusOut } = options;
+
+  const handleFocusOut = (event: FocusEvent) => {
+    if (onFocusOut && event.relatedTarget instanceof Node && !node.contains(event.relatedTarget as Node)) {
+      onFocusOut();
+    }
+  };
+
+  node.addEventListener('focusout', handleFocusOut);
+
+  return {
+    destroy() {
+      node.removeEventListener('focusout', handleFocusOut);
+    },
+  };
+}