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MikeTrizna

Added find and replace functionality, with case sensitivity functionality

c184c36 3 months ago

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history blame contribute delete

33.3 kB

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Historical Newspaper OCR Viewer</title>

	<!-- PDF.js Library -->
	<script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.min.js"></script>

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

	body {
	font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
	height: 100vh;
	overflow: hidden;
	background-color: #f5f5f5;
	}

	.header {
	background-color: #2c3e50;
	color: white;
	padding: 15px 20px;
	box-shadow: 0 2px 4px rgba(0,0,0,0.1);
	}

	.header h1 {
	font-size: 24px;
	margin-bottom: 10px;
	}

	.controls {
	display: flex;
	gap: 15px;
	align-items: center;
	flex-wrap: wrap;
	}

	.select-container {
	flex: 1;
	max-width: 800px;
	}

	.select-container select {
	width: 100%;
	padding: 8px 12px;
	border: 1px solid #ddd;
	border-radius: 4px;
	font-size: 14px;
	background-color: white;
	}

	.metadata {
	background-color: #ecf0f1;
	padding: 15px 20px;
	border-bottom: 1px solid #bdc3c7;
	display: none;
	}

	.metadata.active {
	display: block;
	}

	.metadata-content {
	display: flex;
	gap: 20px;
	align-items: center;
	flex-wrap: wrap;
	}

	.metadata-item {
	font-size: 14px;
	}

	.metadata-item strong {
	color: #2c3e50;
	}

	.metadata-item a {
	color: #3498db;
	text-decoration: none;
	}

	.metadata-item a:hover {
	text-decoration: underline;
	}

	.main-container {
	display: flex;
	height: calc(100vh - 180px);
	background-color: white;
	}

	.pdf-panel, .text-panel {
	width: 50%;
	display: flex;
	flex-direction: column;
	border-right: 1px solid #ddd;
	}

	.text-panel {
	border-right: none;
	}

	.panel-header {
	background-color: #34495e;
	color: white;
	padding: 12px 20px;
	font-weight: 600;
	font-size: 14px;
	display: flex;
	justify-content: space-between;
	align-items: center;
	}

	/* Search Toolbar Styles */
	.search-toolbar {
	background-color: #ecf0f1;
	padding: 8px 15px;
	display: flex;
	gap: 8px;
	align-items: center;
	border-bottom: 1px solid #bdc3c7;
	}

	.search-toolbar input[type="text"] {
	padding: 4px 8px;
	border: 1px solid #bdc3c7;
	border-radius: 3px;
	font-size: 13px;
	width: 140px;
	}

	.search-toolbar button {
	padding: 4px 10px;
	background-color: #fff;
	border: 1px solid #bdc3c7;
	border-radius: 3px;
	cursor: pointer;
	font-size: 12px;
	color: #2c3e50;
	transition: all 0.2s;
	}

	.search-toolbar button:hover:not(:disabled) {
	background-color: #e8e8e8;
	border-color: #95a5a6;
	}

	.search-toolbar button:disabled {
	opacity: 0.5;
	cursor: not-allowed;
	}

	.search-toolbar label {
	display: flex;
	align-items: center;
	gap: 4px;
	font-size: 12px;
	color: #2c3e50;
	cursor: pointer;
	user-select: none;
	}

	.search-toolbar input[type="checkbox"] {
	cursor: pointer;
	}

	.search-msg {
	font-size: 12px;
	color: #7f8c8d;
	margin-left: auto;
	}

	.pdf-controls {
	display: flex;
	gap: 10px;
	align-items: center;
	}

	.zoom-btn {
	background-color: #2c3e50;
	color: white;
	border: none;
	padding: 5px 12px;
	border-radius: 4px;
	cursor: pointer;
	font-size: 16px;
	font-weight: bold;
	transition: background-color 0.2s;
	min-width: 32px;
	}

	.zoom-btn:hover:not(:disabled) {
	background-color: #1a252f;
	}

	.zoom-btn:disabled {
	background-color: #95a5a6;
	cursor: not-allowed;
	opacity: 0.5;
	}

	.zoom-level {
	font-size: 13px;
	min-width: 50px;
	text-align: center;
	}

	.ocr-controls {
	display: flex;
	gap: 15px;
	align-items: center;
	}

	.ocr-toggle {
	display: flex;
	gap: 10px;
	background-color: #2c3e50;
	padding: 5px;
	border-radius: 4px;
	}

	.ocr-toggle label {
	padding: 5px 12px;
	cursor: pointer;
	border-radius: 3px;
	font-size: 13px;
	transition: background-color 0.2s;
	}

	.ocr-toggle input[type="radio"] {
	display: none;
	}

	.ocr-toggle input[type="radio"]:checked + span {
	background-color: #3498db;
	}

	.ocr-toggle span {
	padding: 5px 12px;
	border-radius: 3px;
	font-size: 13px;
	}

	.export-btn {
	background-color: #27ae60;
	color: white;
	border: none;
	padding: 6px 16px;
	border-radius: 4px;
	cursor: pointer;
	font-size: 13px;
	font-weight: 600;
	transition: background-color 0.2s;
	}

	.export-btn:hover {
	background-color: #229954;
	}

	.export-btn:disabled {
	background-color: #95a5a6;
	cursor: not-allowed;
	}

	.panel-content {
	flex: 1;
	overflow: auto;
	position: relative;
	}

	.panel-content.grabbable {
	cursor: grab;
	}

	.panel-content.grabbing {
	cursor: grabbing;
	}

	#pdf-canvas {
	display: block;
	margin: 20px auto;
	box-shadow: 0 2px 8px rgba(0,0,0,0.1);
	}

	#ocr-text {
	width: 100%;
	height: 100%;
	border: none;
	padding: 20px;
	font-family: 'Courier New', monospace;
	font-size: 14px;
	line-height: 1.6;
	resize: none;
	outline: none;
	}

	.loading {
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	text-align: center;
	color: #7f8c8d;
	}

	.loading-spinner {
	border: 4px solid #ecf0f1;
	border-top: 4px solid #3498db;
	border-radius: 50%;
	width: 40px;
	height: 40px;
	animation: spin 1s linear infinite;
	margin: 0 auto 10px;
	}

	@keyframes spin {
	0% { transform: rotate(0deg); }
	100% { transform: rotate(360deg); }
	}

	.error-message {
	color: #e74c3c;
	padding: 20px;
	text-align: center;
	}

	.empty-state {
	text-align: center;
	color: #95a5a6;
	padding: 40px;
	font-size: 16px;
	}

	.empty-state-icon {
	font-size: 48px;
	margin-bottom: 10px;
	}
	</style>
	</head>
	<body>
	<div class="header">
	<h1>Historical Newspaper OCR Viewer</h1>
	<div class="controls">
	<div class="select-container">
	<select id="record-select" disabled>
	<option value="">Loading records...</option>
	</select>
	</div>
	</div>
	</div>

	<div class="metadata" id="metadata">
	<div class="metadata-content">
	<div class="metadata-item">
	<strong>Title:</strong> <span id="meta-title">-</span>
	</div>
	<div class="metadata-item">
	<strong>Date:</strong> <span id="meta-date">-</span>
	</div>
	<div class="metadata-item">
	<strong>Page:</strong> <span id="meta-page">-</span>
	</div>
	<div class="metadata-item">
	<a id="meta-link" href="#" target="_blank">View on Library of Congress →</a>
	</div>
	</div>
	</div>

	<div class="main-container">
	<div class="pdf-panel">
	<div class="panel-header">
	<span>PDF Viewer</span>
	<div class="pdf-controls">
	<button class="zoom-btn" id="zoom-out-btn" disabled title="Zoom Out">−</button>
	<span class="zoom-level" id="zoom-level">100%</span>
	<button class="zoom-btn" id="zoom-in-btn" disabled title="Zoom In">+</button>
	<button class="zoom-btn" id="zoom-reset-btn" disabled title="Reset Zoom">Reset</button>
	</div>
	</div>
	<div class="panel-content" id="pdf-container">
	<div class="empty-state">
	<div class="empty-state-icon">📄</div>
	<div>Select a record to view the PDF</div>
	</div>
	</div>
	</div>

	<div class="text-panel">
	<div class="panel-header">
	<span>OCR Text</span>
	<div class="ocr-controls">
	<div class="ocr-toggle">
	<label>
	<input type="radio" name="ocr-source" value="textract" checked>
	<span>New OCR</span>
	</label>
	<label>
	<input type="radio" name="ocr-source" value="loc">
	<span>Original OCR</span>
	</label>
	</div>
	<button class="export-btn" id="export-btn" disabled>Export Text</button>
	</div>
	</div>

	<!-- Added Search Toolbar -->
	<div class="search-toolbar">
	<input type="text" id="find-input" placeholder="Find..." disabled>
	<input type="text" id="replace-input" placeholder="Replace with..." disabled>
	<button id="find-next-btn" disabled title="Find Next Occurrence">Find Next</button>
	<button id="replace-btn" disabled title="Replace Current Selection">Replace</button>
	<button id="replace-all-btn" disabled title="Replace All Occurrences">Replace All</button>
	<label>
	<input type="checkbox" id="case-sensitive-cb" disabled>
	Match Case
	</label>
	<span id="search-msg" class="search-msg"></span>
	</div>

	<div class="panel-content">
	<textarea
	id="ocr-text"
	placeholder="Select a record and OCR source to view text..."
	disabled
	></textarea>
	</div>
	</div>
	</div>

	<script>
	// Configure PDF.js worker
	pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.worker.min.js';

	// Application state
	const state = {
	records: [],
	currentRecord: null,
	currentOcrSource: 'textract',
	originalOcrText: '',
	hasEdits: false,
	isLoading: false,
	currentPdf: null,
	zoomLevel: 1.0
	};

	// DOM elements
	const recordSelect = document.getElementById('record-select');
	const ocrText = document.getElementById('ocr-text');
	const exportBtn = document.getElementById('export-btn');
	const pdfContainer = document.getElementById('pdf-container');
	const metadata = document.getElementById('metadata');
	const ocrRadios = document.querySelectorAll('input[name="ocr-source"]');
	const zoomInBtn = document.getElementById('zoom-in-btn');
	const zoomOutBtn = document.getElementById('zoom-out-btn');
	const zoomResetBtn = document.getElementById('zoom-reset-btn');
	const zoomLevel = document.getElementById('zoom-level');

	// Search DOM elements
	const findInput = document.getElementById('find-input');
	const replaceInput = document.getElementById('replace-input');
	const findNextBtn = document.getElementById('find-next-btn');
	const replaceBtn = document.getElementById('replace-btn');
	const replaceAllBtn = document.getElementById('replace-all-btn');
	const caseSensitiveCb = document.getElementById('case-sensitive-cb');
	const searchMsg = document.getElementById('search-msg');

	// Initialize application
	async function init() {
	try {
	const response = await fetch('data.json');
	if (!response.ok) {
	throw new Error('Failed to load data.json');
	}
	state.records = await response.json();

	populateRecordSelect();
	enableControls();
	setupEventListeners();
	} catch (error) {
	console.error('Initialization error:', error);
	recordSelect.innerHTML = '<option value="">Error loading records</option>';
	alert('Failed to load data.json. Please ensure the file exists in the same directory as index.html.');
	}
	}

	function enableControls() {
	recordSelect.disabled = false;
	}

	function populateRecordSelect() {
	recordSelect.innerHTML = '<option value="">Select a record...</option>';

	state.records.forEach(record => {
	const option = document.createElement('option');
	option.value = record.id;
	option.textContent = `${record.id} - ${record.newspaper_title} ${record.publication_date} Page ${record.page}`;
	recordSelect.appendChild(option);
	});
	}

	function setupEventListeners() {
	// Record selection
	recordSelect.addEventListener('change', (e) => {
	const recordId = e.target.value;
	if (recordId) {
	const record = state.records.find(r => r.id === recordId);
	loadRecord(record);
	}
	});

	// OCR source toggle
	ocrRadios.forEach(radio => {
	radio.addEventListener('change', (e) => {
	if (state.hasEdits) {
	const confirmed = confirm('You have unsaved edits. Switching OCR source will discard your changes. Continue?');
	if (!confirmed) {
	// Revert to previous selection
	document.querySelector(`input[name="ocr-source"][value="${state.currentOcrSource}"]`).checked = true;
	return;
	}
	}
	state.currentOcrSource = e.target.value;
	if (state.currentRecord) {
	loadOcrText(state.currentRecord);
	}
	});
	});

	// Track edits
	ocrText.addEventListener('input', () => {
	state.hasEdits = ocrText.value !== state.originalOcrText;
	});

	// Export button
	exportBtn.addEventListener('click', exportText);

	// Zoom controls
	zoomInBtn.addEventListener('click', () => zoomPdf(0.25));
	zoomOutBtn.addEventListener('click', () => zoomPdf(-0.25));
	zoomResetBtn.addEventListener('click', () => resetZoom());

	// Search controls
	findNextBtn.addEventListener('click', findNext);
	replaceBtn.addEventListener('click', replaceCurrent);
	replaceAllBtn.addEventListener('click', replaceAll);

	// Allow "Enter" key in find input to trigger Find Next
	findInput.addEventListener('keypress', (e) => {
	if (e.key === 'Enter') {
	findNext();
	}
	});

	// Pan functionality
	setupPanControls();
	}

	// --- Search Functions ---

	function findNext() {
	const query = findInput.value;
	if (!query) return;

	const isCaseSensitive = caseSensitiveCb.checked;
	const text = ocrText.value;
	const startPos = ocrText.selectionEnd; // Start searching from after current cursor/selection

	let nextPos = -1;

	// Perform search based on case sensitivity
	if (isCaseSensitive) {
	nextPos = text.indexOf(query, startPos);
	if (nextPos === -1) {
	nextPos = text.indexOf(query, 0); // Wrap
	searchMsg.textContent = nextPos !== -1 ? "Wrapped to top" : "Not found";
	} else {
	searchMsg.textContent = "";
	}
	} else {
	const lowerText = text.toLowerCase();
	const lowerQuery = query.toLowerCase();
	nextPos = lowerText.indexOf(lowerQuery, startPos);
	if (nextPos === -1) {
	nextPos = lowerText.indexOf(lowerQuery, 0); // Wrap
	searchMsg.textContent = nextPos !== -1 ? "Wrapped to top" : "Not found";
	} else {
	searchMsg.textContent = "";
	}
	}

	if (nextPos !== -1) {
	// Select the found text
	ocrText.focus();
	ocrText.setSelectionRange(nextPos, nextPos + query.length);

	// Enhanced Scroll to selection logic
	// Calculate percentage position of the match
	const progress = nextPos / text.length;
	// Set scroll top based on percentage of total scroll height
	// Offset by half container height to try and center it
	const scrollTarget = (ocrText.scrollHeight * progress) - (ocrText.clientHeight / 2);

	ocrText.scrollTop = scrollTarget;

	// Fallback: Trigger blur/focus which forces browser to scroll to cursor
	// This handles edge cases where the calculation might be slightly off due to variable line wrapping
	// setTimeout ensures the scroll calculation happens first, then the browser creates final view
	setTimeout(() => {
	ocrText.blur();
	ocrText.focus();
	}, 10);
	}
	}

	function replaceCurrent() {
	const query = findInput.value;
	const replacement = replaceInput.value;
	if (!query) return;

	const isCaseSensitive = caseSensitiveCb.checked;

	// Check if current selection matches the find query
	const start = ocrText.selectionStart;
	const end = ocrText.selectionEnd;
	const selectedText = ocrText.value.substring(start, end);

	let match = false;
	if (isCaseSensitive) {
	match = selectedText === query;
	} else {
	match = selectedText.toLowerCase() === query.toLowerCase();
	}

	if (match) {
	// Perform replacement
	ocrText.setRangeText(replacement, start, end, 'end');
	state.hasEdits = true;
	searchMsg.textContent = "Replaced";

	// Automatically find next
	findNext();
	} else {
	// If text isn't selected or doesn't match, try to find next occurrence first
	findNext();
	}
	}

	function replaceAll() {
	const query = findInput.value;
	const replacement = replaceInput.value;
	if (!query) return;

	const isCaseSensitive = caseSensitiveCb.checked;
	const text = ocrText.value;

	// Escape special regex characters to perform a literal "Replace All"
	const escapedQuery = query.replace(/[.*+?^${}()\|[\]\\]/g, '\\$&');
	const flags = isCaseSensitive ? 'g' : 'gi';
	const regex = new RegExp(escapedQuery, flags);

	const matchCount = (text.match(regex) \|\| []).length;

	if (matchCount > 0) {
	const newText = text.replace(regex, replacement);
	ocrText.value = newText;
	state.hasEdits = true;
	searchMsg.textContent = `Replaced ${matchCount} occurrences`;
	} else {
	searchMsg.textContent = "0 matches found";
	}
	}

	function updateSearchControls(enabled) {
	findInput.disabled = !enabled;
	replaceInput.disabled = !enabled;
	findNextBtn.disabled = !enabled;
	replaceBtn.disabled = !enabled;
	replaceAllBtn.disabled = !enabled;
	caseSensitiveCb.disabled = !enabled;
	if (!enabled) {
	findInput.value = '';
	replaceInput.value = '';
	caseSensitiveCb.checked = false;
	searchMsg.textContent = '';
	}
	}

	// --- End Search Functions ---

	async function loadRecord(record) {
	state.currentRecord = record;
	state.hasEdits = false;

	// Update metadata
	metadata.classList.add('active');
	document.getElementById('meta-title').textContent = record.newspaper_title;
	document.getElementById('meta-date').textContent = record.publication_date;
	document.getElementById('meta-page').textContent = record.page;
	document.getElementById('meta-link').href = record.loc_record_url;

	// Load PDF and OCR text in parallel
	await Promise.all([
	loadPdf(record.pdf_path),
	loadOcrText(record)
	]);
	}

	async function loadPdf(pdfPath) {
	pdfContainer.innerHTML = '<div class="loading"><div class="loading-spinner"></div><div>Loading PDF...</div></div>';

	try {
	const loadingTask = pdfjsLib.getDocument(pdfPath);
	const pdf = await loadingTask.promise;
	state.currentPdf = pdf;
	state.zoomLevel = 1.0;

	await renderPdf();

	// Enable zoom controls
	zoomInBtn.disabled = false;
	zoomOutBtn.disabled = false;
	zoomResetBtn.disabled = false;

	// Enable pan controls
	pdfContainer.classList.add('grabbable');
	} catch (error) {
	console.error('PDF loading error:', error);
	pdfContainer.innerHTML = '<div class="error-message">Failed to load PDF: ' + error.message + '</div>';
	}
	}

	async function renderPdf() {
	if (!state.currentPdf) return;

	pdfContainer.innerHTML = '<div class="loading"><div class="loading-spinner"></div><div>Rendering PDF...</div></div>';

	const page = await state.currentPdf.getPage(1);
	const baseScale = 1.5;
	const scale = baseScale * state.zoomLevel;
	const viewport = page.getViewport({ scale });

	const canvas = document.createElement('canvas');
	canvas.id = 'pdf-canvas';
	const context = canvas.getContext('2d');
	canvas.height = viewport.height;
	canvas.width = viewport.width;

	const renderContext = {
	canvasContext: context,
	viewport: viewport
	};

	await page.render(renderContext).promise;

	pdfContainer.innerHTML = '';
	pdfContainer.appendChild(canvas);

	// Update zoom level display
	zoomLevel.textContent = Math.round(state.zoomLevel * 100) + '%';
	}

	async function loadOcrText(record) {
	ocrText.value = '';
	ocrText.disabled = true;
	exportBtn.disabled = true;
	updateSearchControls(false); // Disable search controls while loading
	state.hasEdits = false;

	const loadingDiv = document.createElement('div');
	loadingDiv.className = 'loading';
	loadingDiv.innerHTML = '<div class="loading-spinner"></div><div>Loading OCR text...</div>';
	ocrText.parentElement.appendChild(loadingDiv);

	try {
	let text = '';

	if (state.currentOcrSource === 'textract') {
	text = await fetchTextractOcr(record.textract_ocr_file);
	} else {
	text = await fetchLocOcr(record.loc_altoxml_path);
	}

	state.originalOcrText = text;
	ocrText.value = text;
	ocrText.disabled = false;
	exportBtn.disabled = false;
	updateSearchControls(true); // Enable search controls
	loadingDiv.remove();
	} catch (error) {
	console.error('OCR loading error:', error);
	loadingDiv.innerHTML = '<div class="error-message">Failed to load OCR text: ' + error.message + '</div>';
	setTimeout(() => loadingDiv.remove(), 3000);
	}
	}

	async function fetchTextractOcr(filePath) {
	const response = await fetch(filePath);
	if (!response.ok) {
	throw new Error(`HTTP error! status: ${response.status}`);
	}
	return await response.text();
	}

	async function fetchLocOcr(xmlPath) {
	const response = await fetch(xmlPath);
	if (!response.ok) {
	throw new Error(`HTTP error! status: ${response.status}`);
	}
	const xmlText = await response.text();
	return parseAltoXml(xmlText);
	}

	function parseAltoXml(xmlText) {
	const parser = new DOMParser();
	const xmlDoc = parser.parseFromString(xmlText, 'text/xml');

	// Check for parsing errors
	const parserError = xmlDoc.querySelector('parsererror');
	if (parserError) {
	throw new Error('XML parsing error');
	}

	const strings = xmlDoc.getElementsByTagName('String');
	const textLines = [];
	let currentLine = [];
	let lastVPos = null;

	for (let i = 0; i < strings.length; i++) {
	const stringElement = strings[i];
	const content = stringElement.getAttribute('CONTENT');
	const vpos = stringElement.getAttribute('VPOS');

	if (content) {
	// Check if we're on a new line (VPOS changed significantly)
	if (lastVPos !== null && vpos !== null) {
	const vposDiff = Math.abs(parseInt(vpos) - parseInt(lastVPos));
	if (vposDiff > 50) { // Threshold for new line
	if (currentLine.length > 0) {
	textLines.push(currentLine.join(' '));
	currentLine = [];
	}
	}
	}

	currentLine.push(content);
	lastVPos = vpos;
	}
	}

	// Add the last line
	if (currentLine.length > 0) {
	textLines.push(currentLine.join(' '));
	}

	return textLines.join('\n');
	}

	function exportText() {
	if (!state.currentRecord) return;

	const text = ocrText.value;
	const record = state.currentRecord;

	// Sanitize filename
	const sanitizedTitle = record.newspaper_title
	.replace(/[^a-z0-9]/gi, '_')
	.replace(/_+/g, '_')
	.toLowerCase();

	const filename = `${record.id}_${sanitizedTitle}_${record.publication_date}.txt`;

	// Create blob and download
	const blob = new Blob([text], { type: 'text/plain' });
	const url = URL.createObjectURL(blob);
	const a = document.createElement('a');
	a.href = url;
	a.download = filename;
	document.body.appendChild(a);
	a.click();
	document.body.removeChild(a);
	URL.revokeObjectURL(url);
	}

	function zoomPdf(delta) {
	// Store current scroll position as percentage
	const scrollLeftPercent = pdfContainer.scrollLeft / (pdfContainer.scrollWidth - pdfContainer.clientWidth);
	const scrollTopPercent = pdfContainer.scrollTop / (pdfContainer.scrollHeight - pdfContainer.clientHeight);

	// Update zoom level (limit between 0.5x and 5x)
	state.zoomLevel = Math.max(0.5, Math.min(5, state.zoomLevel + delta));

	// Re-render PDF
	renderPdf().then(() => {
	// Restore scroll position
	pdfContainer.scrollLeft = scrollLeftPercent * (pdfContainer.scrollWidth - pdfContainer.clientWidth);
	pdfContainer.scrollTop = scrollTopPercent * (pdfContainer.scrollHeight - pdfContainer.clientHeight);
	});
	}

	function resetZoom() {
	state.zoomLevel = 1.0;
	renderPdf();
	}

	function setupPanControls() {
	let isMouseDown = false;
	let startX, startY, scrollLeft, scrollTop;

	pdfContainer.addEventListener('mousedown', (e) => {
	// Only pan if we clicked on the container or canvas
	if (e.target === pdfContainer \|\| e.target.id === 'pdf-canvas') {
	isMouseDown = true;
	pdfContainer.classList.remove('grabbable');
	pdfContainer.classList.add('grabbing');

	startX = e.pageX - pdfContainer.offsetLeft;
	startY = e.pageY - pdfContainer.offsetTop;
	scrollLeft = pdfContainer.scrollLeft;
	scrollTop = pdfContainer.scrollTop;
	}
	});

	pdfContainer.addEventListener('mouseleave', () => {
	if (isMouseDown) {
	isMouseDown = false;
	pdfContainer.classList.remove('grabbing');
	pdfContainer.classList.add('grabbable');
	}
	});

	pdfContainer.addEventListener('mouseup', () => {
	if (isMouseDown) {
	isMouseDown = false;
	pdfContainer.classList.remove('grabbing');
	pdfContainer.classList.add('grabbable');
	}
	});

	pdfContainer.addEventListener('mousemove', (e) => {
	if (!isMouseDown) return;
	e.preventDefault();

	const x = e.pageX - pdfContainer.offsetLeft;
	const y = e.pageY - pdfContainer.offsetTop;
	const walkX = (x - startX) * 1.5; // Multiply for faster scrolling
	const walkY = (y - startY) * 1.5;

	pdfContainer.scrollLeft = scrollLeft - walkX;
	pdfContainer.scrollTop = scrollTop - walkY;
	});
	}

	// Initialize on page load
	init();
	</script>
	</body>
	</html>