vdoc: implement keyboard shortcuts for search navigation (#19088)

cmd/tools/vdoc/theme/doc.css

@@ -197,9 +197,14 @@ body {
 	width: 1.2rem;
 	height: 1.2rem;
 }
-.doc-nav > .heading-container > .heading > #search {
+.doc-nav #search {
+	position: relative;
 	margin: 0.6rem 1.2rem 1rem 1.2rem;
+	display: flex;
+}
+.doc-nav #search input {
 	border: none;
+	width: 100%;
 	border-radius: 0.2rem;
 	padding: 0.5rem 1rem;
 	outline: none;
@@ -208,17 +213,32 @@ body {
 	color: #fff;
 	color: var(--menu-search-text-color);
 }
-.doc-nav > .heading-container > .heading > #search::placeholder {
+.doc-nav #search input::placeholder {
 	color: #edf2f7;
 	text-transform: uppercase;
 	font-size: 12px;
 	font-weight: 600;
 }
-.doc-nav > .heading-container > .heading > #search:-ms-input-placeholder {
-	color: #edf2f7;
-	text-transform: uppercase;
-	font-size: 12px;
-	font-weight: 600;
+.doc-nav #search-keys {
+	position: absolute;
+	height: 100%;
+	align-items: center;
+	display: flex;
+	top: 0;
+	right: 0.75rem;
+	opacity: 0.33;
+	transition: opacity 0.1s;
+}
+.doc-nav #search-keys.hide {
+	opacity: 0;
+}
+.doc-nav #search-keys kbd {
+	padding: 2.5px 3px;
+	margin-left: 1px;
+	font-size: 11px;
+	background-color: var(--menu-background-color);
+	border: 1px solid #ffffff44;
+	border-radius: 3px;
 }
 .doc-nav > .content {
 	padding: 0 2rem 2rem 2rem;
@@ -278,7 +298,8 @@ body {
 .doc-nav .search li {
 	line-height: 1.5;
 }
-.doc-nav > .search .result:hover {
+.doc-nav > .search .result:hover,
+.doc-nav > .search .result.selected {
 	background-color: #00000021;
 	background-color: var(--menu-search-result-background-hover-color);
 }

cmd/tools/vdoc/theme/doc.js

@@ -49,7 +49,6 @@ function setupMobileToggle() {
 		const isHidden = docNav.classList.contains('hidden');
 		docNav.classList.toggle('hidden');
 		const search = docNav.querySelector('.search');
-		// console.log(search);
 		const searchHasResults = search.classList.contains('has-results');
 		if (isHidden && searchHasResults) {
 			search.classList.remove('mobile-hidden');
@@ -145,6 +144,72 @@ function setupSearch() {
 		}
 	});
 	searchInput.addEventListener('input', onInputChange);
+	setupSearchKeymaps();
+}
+
+function setupSearchKeymaps() {
+	const searchInput = document.querySelector('#search input');
+	// Keyboard shortcut indicator
+	const searchKeys = document.createElement('div');
+	const modifierKeyPrefix = navigator.platform.includes('Mac') ? '⌘' : 'Ctrl';
+	searchKeys.setAttribute('id', 'search-keys');
+	searchKeys.innerHTML = '<kbd>' + modifierKeyPrefix + '</kbd><kbd>k</kbd>';
+	searchInput.parentElement?.appendChild(searchKeys);
+	searchInput.addEventListener('focus', () => searchKeys.classList.add('hide'));
+	searchInput.addEventListener('blur', () => searchKeys.classList.remove('hide'));
+	// Global shortcuts to focus searchInput
+	document.addEventListener('keydown', (ev) => {
+		if (ev.key === '/' || ((ev.ctrlKey || ev.metaKey) && ev.key === 'k')) {
+			ev.preventDefault();
+			searchInput.focus();
+		}
+	});
+	// Shortcuts while searchInput is focused
+	let selectedIdx = -1;
+	function selectResult(results, newIdx) {
+		if (selectedIdx !== -1) {
+			results[selectedIdx].classList.remove('selected');
+		}
+		results[newIdx].classList.add('selected');
+		results[newIdx].scrollIntoView({ behavior: 'smooth', block: 'end', inline: 'nearest' });
+		selectedIdx = newIdx;
+	}
+	searchInput.addEventListener('keydown', (ev) => {
+		const searchResults = document.querySelectorAll('.search .result');
+		switch (ev.key) {
+			case 'Escape':
+				searchInput.blur();
+				break;
+			case 'Enter':
+				if (!searchResults.length || selectedIdx === -1) break;
+				searchResults[selectedIdx].querySelector('a').click();
+				break;
+			case 'ArrowDown':
+				ev.preventDefault();
+				if (!searchResults.length) break;
+				if (selectedIdx >= searchResults.length - 1) {
+					// Cycle to first if last is selected
+					selectResult(searchResults, 0);
+				} else {
+					// Select next
+					selectResult(searchResults, selectedIdx + 1);
+				}
+				break;
+			case 'ArrowUp':
+				ev.preventDefault();
+				if (!searchResults.length) break;
+				if (selectedIdx <= 0) {
+					// Cycle to last if first is selected (or select it if none is selcted yet)
+					selectResult(searchResults, searchResults.length - 1);
+				} else {
+					// Select previous
+					selectResult(searchResults, selectedIdx - 1);
+				}
+				break;
+			default:
+				selectedIdx = -1;
+		}
+	});
 }
 
 function createSearchResult(data) {
@@ -194,11 +259,3 @@ function debounce(func, timeout) {
 		timer = setTimeout(next, timeout > 0 ? timeout : 300);
 	};
 }
-
-document.addEventListener('keypress', (ev) => {
-	if (ev.key == '/') {
-		const search = document.getElementById('search');
-		ev.preventDefault();
-		search.focus();
-	}
-});

cmd/tools/vdoc/theme/index.html

@@ -46,7 +46,9 @@
 							</div>
 							{{ menu_icon }}
 						</div>
-						<input type="text" id="search" placeholder="Search... (beta)" autocomplete="off" />
+						<div id="search">
+							<input type="text" placeholder="Search... (beta)" autocomplete="off" />
+						</div>
 					</div>
 				</div>
 				<nav class="search hidden"></nav>