Autocomplete in Javascript

<link href="https://unpkg.com/ionicons@7.1.0/dist/ionicons/ionicons.css" rel="stylesheet">
<script type="module" src="https://unpkg.com/ionicons@7.1.0/dist/ionicons/ionicons.esm.js"></script>
<script nomodule src="https://unpkg.com/ionicons@7.1.0/dist/ionicons/ionicons.js"></script>

<div class="container">
  <div class="header">
    <h1>Autocomplete Search</h1>
    <p>Type to search programming languages</p>
  </div>

  <div class="autocomplete-wrapper">
    <div class="search-container">
      <ion-icon name="search-outline" class="search-icon"></ion-icon>
      <input 
             type="text" 
             id="autocompleteInput" 
             placeholder="Search programming languages..."
             autocomplete="off"
             >
      <ion-icon name="close-circle-outline" class="clear-icon" id="clearIcon"></ion-icon>
    </div>

    <div class="suggestions-list" id="suggestionsList"></div>
  </div>

  <div class="selected-items" id="selectedItems"></div>
</div>

  * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #0a0a0a 0%, #1a1a2e 100%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
            color: #ffffff;
        }

        .container {
            max-width: 600px;
            width: 100%;
        }

        .header {
            text-align: center;
            margin-bottom: 50px;
        }

        .header h1 {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 10px;
            background: linear-gradient(135deg, #00FFFF 0%, #00cccc 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .header p {
            color: #a0a0a0;
            font-size: 1rem;
        }

        .autocomplete-wrapper {
            position: relative;
            width: 100%;
        }

        .search-container {
            position: relative;
            width: 100%;
            background: rgba(255, 255, 255, 0.05);
            border: 2px solid rgba(0, 255, 255, 0.2);
            border-radius: 12px;
            transition: all 0.3s ease;
            backdrop-filter: blur(10px);
        }

        .search-container:focus-within {
            border-color: #00FFFF;
            box-shadow: 0 0 30px rgba(0, 255, 255, 0.3);
            transform: translateY(-2px);
        }

        .search-icon {
            position: absolute;
            left: 20px;
            top: 50%;
            transform: translateY(-50%);
            color: #00FFFF;
            font-size: 24px;
            pointer-events: none;
            z-index: 2;
        }

        #autocompleteInput {
            width: 100%;
            padding: 20px 60px 20px 60px;
            font-size: 1.1rem;
            background: transparent;
            border: none;
            outline: none;
            color: #ffffff;
            font-family: inherit;
        }

        #autocompleteInput::placeholder {
            color: rgba(255, 255, 255, 0.4);
        }

        .clear-icon {
            position: absolute;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            color: #00FFFF;
            font-size: 24px;
            cursor: pointer;
            opacity: 0;
            transition: all 0.3s ease;
            z-index: 2;
        }

        .clear-icon.visible {
            opacity: 1;
        }

        .clear-icon:hover {
            color: #00cccc;
            transform: translateY(-50%) scale(1.1);
        }

        .suggestions-list {
            position: absolute;
            top: calc(100% + 10px);
            left: 0;
            width: 100%;
            background: rgba(26, 26, 46, 0.95);
            border: 2px solid rgba(0, 255, 255, 0.2);
            border-radius: 12px;
            max-height: 400px;
            overflow-y: auto;
            opacity: 0;
            visibility: hidden;
            transform: translateY(-10px);
            transition: all 0.3s ease;
            backdrop-filter: blur(20px);
            z-index: 1000;
        }

        .suggestions-list.show {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .suggestions-list::-webkit-scrollbar {
            width: 8px;
        }

        .suggestions-list::-webkit-scrollbar-track {
            background: rgba(255, 255, 255, 0.05);
            border-radius: 10px;
        }

        .suggestions-list::-webkit-scrollbar-thumb {
            background: #00FFFF;
            border-radius: 10px;
        }

        .suggestion-item {
            padding: 15px 20px;
            cursor: pointer;
            transition: all 0.2s ease;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .suggestion-item:last-child {
            border-bottom: none;
        }

        .suggestion-item:hover {
            background: rgba(0, 255, 255, 0.1);
            padding-left: 25px;
        }

        .suggestion-icon {
            color: #00FFFF;
            font-size: 20px;
            flex-shrink: 0;
        }

        .suggestion-text {
            color: #ffffff;
            font-size: 1rem;
        }

        .suggestion-item.highlighted {
            background: rgba(0, 255, 255, 0.15);
        }

        .no-results {
            padding: 30px;
            text-align: center;
            color: rgba(255, 255, 255, 0.5);
        }

        .selected-items {
            margin-top: 30px;
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .selected-item {
            background: rgba(0, 255, 255, 0.1);
            border: 1px solid #00FFFF;
            padding: 8px 16px;
            border-radius: 25px;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            animation: fadeIn 0.3s ease;
        }

        .selected-item-text {
            color: #00FFFF;
        }

        .remove-item {
            cursor: pointer;
            color: #00FFFF;
            font-size: 18px;
            transition: transform 0.2s ease;
        }

        .remove-item:hover {
            transform: scale(1.2) rotate(90deg);
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: scale(0.8);
            }
            to {
                opacity: 1;
                transform: scale(1);
            }
        }

        @media (max-width: 768px) {
            .header h1 {
                font-size: 2rem;
            }

            #autocompleteInput {
                padding: 18px 50px 18px 50px;
                font-size: 1rem;
            }

            .suggestions-list {
                max-height: 300px;
            }
        }

   // Data source for autocomplete
        const programmingLanguages = [
            { name: 'JavaScript', icon: 'logo-javascript' },
            { name: 'Python', icon: 'logo-python' },
            { name: 'Java', icon: 'logo-java' },
            { name: 'TypeScript', icon: 'code-outline' },
            { name: 'C++', icon: 'code-slash-outline' },
            { name: 'C#', icon: 'code-slash-outline' },
            { name: 'Ruby', icon: 'code-outline' },
            { name: 'PHP', icon: 'code-outline' },
            { name: 'Swift', icon: 'logo-apple' },
            { name: 'Kotlin', icon: 'code-outline' },
            { name: 'Go', icon: 'code-outline' },
            { name: 'Rust', icon: 'code-outline' },
            { name: 'SQL', icon: 'server-outline' },
            { name: 'HTML', icon: 'logo-html5' },
            { name: 'CSS', icon: 'logo-css3' },
            { name: 'R', icon: 'stats-chart-outline' },
            { name: 'Scala', icon: 'code-outline' },
            { name: 'Perl', icon: 'code-outline' },
            { name: 'Dart', icon: 'code-outline' },
            { name: 'Objective-C', icon: 'logo-apple' }
        ];

        const input = document.getElementById('autocompleteInput');
        const suggestionsList = document.getElementById('suggestionsList');
        const clearIcon = document.getElementById('clearIcon');
        const selectedItemsContainer = document.getElementById('selectedItems');
        
        let selectedItems = [];
        let currentFocus = -1;

        // Event listener for input
        input.addEventListener('input', function() {
            const value = this.value.trim();
            
            // Show/hide clear icon
            if (value) {
                clearIcon.classList.add('visible');
            } else {
                clearIcon.classList.remove('visible');
            }

            if (value.length > 0) {
                const filtered = programmingLanguages.filter(lang => 
                    lang.name.toLowerCase().includes(value.toLowerCase())
                );
                displaySuggestions(filtered);
            } else {
                closeSuggestions();
            }
            currentFocus = -1;
        });

        // Clear input
        clearIcon.addEventListener('click', function() {
            input.value = '';
            clearIcon.classList.remove('visible');
            closeSuggestions();
            input.focus();
        });

        // Display suggestions
        function displaySuggestions(suggestions) {
            suggestionsList.innerHTML = '';
            
            if (suggestions.length === 0) {
                suggestionsList.innerHTML = '<div class="no-results">No results found</div>';
                suggestionsList.classList.add('show');
                return;
            }

            suggestions.forEach((item, index) => {
                const div = document.createElement('div');
                div.className = 'suggestion-item';
                div.innerHTML = `
                    <ion-icon name="${item.icon}" class="suggestion-icon"></ion-icon>
                    <span class="suggestion-text">${item.name}</span>
                `;
                
                div.addEventListener('click', function() {
                    selectItem(item);
                });

                suggestionsList.appendChild(div);
            });

            suggestionsList.classList.add('show');
        }

        // Close suggestions
        function closeSuggestions() {
            suggestionsList.classList.remove('show');
            currentFocus = -1;
        }

        // Select item
        function selectItem(item) {
            if (!selectedItems.some(selected => selected.name === item.name)) {
                selectedItems.push(item);
                renderSelectedItems();
            }
            input.value = '';
            clearIcon.classList.remove('visible');
            closeSuggestions();
            input.focus();
        }

        // Render selected items
        function renderSelectedItems() {
            selectedItemsContainer.innerHTML = '';
            selectedItems.forEach((item, index) => {
                const div = document.createElement('div');
                div.className = 'selected-item';
                div.innerHTML = `
                    <ion-icon name="${item.icon}"></ion-icon>
                    <span class="selected-item-text">${item.name}</span>
                    <ion-icon name="close-outline" class="remove-item" onclick="removeItem(${index})"></ion-icon>
                `;
                selectedItemsContainer.appendChild(div);
            });
        }

        // Remove selected item
        function removeItem(index) {
            selectedItems.splice(index, 1);
            renderSelectedItems();
        }

        // Keyboard navigation
        input.addEventListener('keydown', function(e) {
            const items = suggestionsList.querySelectorAll('.suggestion-item');
            
            if (e.key === 'ArrowDown') {
                e.preventDefault();
                currentFocus++;
                addActive(items);
            } else if (e.key === 'ArrowUp') {
                e.preventDefault();
                currentFocus--;
                addActive(items);
            } else if (e.key === 'Enter') {
                e.preventDefault();
                if (currentFocus > -1 && items[currentFocus]) {
                    items[currentFocus].click();
                }
            } else if (e.key === 'Escape') {
                closeSuggestions();
            }
        });

        function addActive(items) {
            if (!items || items.length === 0) return;
            removeActive(items);
            
            if (currentFocus >= items.length) currentFocus = 0;
            if (currentFocus < 0) currentFocus = items.length - 1;
            
            items[currentFocus].classList.add('highlighted');
            items[currentFocus].scrollIntoView({ block: 'nearest' });
        }

        function removeActive(items) {
            items.forEach(item => item.classList.remove('highlighted'));
        }

        // Close suggestions when clicking outside
        document.addEventListener('click', function(e) {
            if (!e.target.closest('.autocomplete-wrapper')) {
                closeSuggestions();
            }
        });