```javascript document.getElementById('uploadForm').addEventListener('submit', function(event) { event.preventDefault(); const fileInput = document.getElementById('fileInput'); const file = fileInput.files[0]; if (!file) { alert('Please select a file to upload.'); return; } const formData = new FormData(); formData.append('file', file); const xhr = new XMLHttpRequest(); xhr.open('POST', '/upload', true); xhr.onload = function () { const messageDiv = document.getElementById('message'); if (xhr.status === 200) { messageDiv.textContent = 'File uploaded successfully!'; } else { messageDiv.textContent = 'File upload failed.'; } }; xhr.send(formData); });

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