Web-Page-Performance-Test/waterfall.js

/**
 * Waterfall Chart Renderer
 * Visualizes network requests timeline with interactive details
 */

let currentHarData = null;
let currentFilter = 'all';

// Load HAR data from URL parameter
async function init() {
    const params = new URLSearchParams(window.location.search);
    const testId = params.get('id');
    
    if (!testId) {
        document.getElementById('waterfallCanvas').innerHTML = 
            '<p style="color: red;">Error: No test ID provided</p>';
        return;
    }
    
    try {
        const response = await fetch(`/reports/${testId}.har.json`);
        if (!response.ok) throw new Error('HAR data not found');
        
        currentHarData = await response.json();
        renderWaterfall();
        setupEventListeners();
    } catch (error) {
        document.getElementById('waterfallCanvas').innerHTML = 
            `<p style="color: red;">Error loading waterfall data: ${error.message}</p>`;
    }
}

function renderWaterfall() {
    const canvas = document.getElementById('waterfallCanvas');
    const entries = currentHarData.entries;
    
    if (!entries || entries.length === 0) {
        canvas.innerHTML = '<p>No requests found</p>';
        return;
    }
    
    // Calculate timeline scale
    const maxTime = Math.max(...entries.map(e => e.timing.endTime));
    const scale = 1000 / maxTime; // pixels per second
    
    // Filter entries based on active filter
    const filteredEntries = currentFilter === 'all' 
        ? entries 
        : entries.filter(e => e.resourceType === currentFilter);
    
    let html = '';
    
    filteredEntries.forEach((entry, index) => {
        const label = truncateUrl(entry.url, 50);
        const timingBars = renderTimingBars(entry.timing, scale);
        
        html += `
            <div class="waterfall-row" data-request-id="${entry.requestId}">
                <div class="request-label" title="${entry.url}">${label}</div>
                <div class="timeline">${timingBars}</div>
            </div>
        `;
    });
    
    canvas.innerHTML = html;
    
    // Attach click handlers
    document.querySelectorAll('.waterfall-row').forEach(row => {
        row.addEventListener('click', () => {
            const requestId = parseInt(row.dataset.requestId);
            showRequestDetails(requestId);
        });
    });
}

function renderTimingBars(timing, scale) {
    let html = '';
    let currentOffset = timing.startTime * scale;
    
    // DNS
    if (timing.dns > 0) {
        const width = timing.dns * scale / 1000;
        html += `<div class="timing-bar bar-dns" style="left: ${currentOffset}px; width: ${width}px" title="DNS: ${timing.dns.toFixed(0)}ms"></div>`;
        currentOffset += width;
    }
    
    // Connect
    if (timing.connect > 0) {
        const width = timing.connect * scale / 1000;
        html += `<div class="timing-bar bar-connect" style="left: ${currentOffset}px; width: ${width}px" title="Connect: ${timing.connect.toFixed(0)}ms"></div>`;
        currentOffset += width;
    }
    
    // SSL
    if (timing.ssl > 0) {
        const width = timing.ssl * scale / 1000;
        html += `<div class="timing-bar bar-ssl" style="left: ${currentOffset}px; width: ${width}px" title="SSL: ${timing.ssl.toFixed(0)}ms"></div>`;
        currentOffset += width;
    }
    
    // Wait (TTFB)
    if (timing.wait > 0) {
        const width = timing.wait * scale / 1000;
        html += `<div class="timing-bar bar-wait" style="left: ${currentOffset}px; width: ${width}px" title="Wait: ${timing.wait.toFixed(0)}ms"></div>`;
        currentOffset += width;
    }
    
    // Receive
    const totalWidth = (timing.endTime - timing.startTime) * scale;
    const receiveWidth = Math.max(totalWidth - (currentOffset - timing.startTime * scale), 0);
    if (receiveWidth > 0) {
        html += `<div class="timing-bar bar-receive" style="left: ${currentOffset}px; width: ${receiveWidth}px" title="Download: ${(receiveWidth / scale * 1000).toFixed(0)}ms"></div>`;
    }
    
    return html;
}

function showRequestDetails(requestId) {
    const entry = currentHarData.entries.find(e => e.requestId === requestId);
    if (!entry) return;
    
    document.getElementById('dialogTitle').textContent = `Request #${requestId}`;
    
    const content = `
        <div class="detail-section">
            <h3>General</h3>
            <div class="detail-row">
                <span class="detail-label">URL:</span>
                <span class="detail-value">${entry.url}</span>
            </div>
            <div class="detail-row">
                <span class="detail-label">Domain:</span>
                <span class="detail-value">${entry.domain}</span>
            </div>
            <div class="detail-row">
                <span class="detail-label">Method:</span>
                <span class="detail-value">${entry.method}</span>
            </div>
            <div class="detail-row">
                <span class="detail-label">Status:</span>
                <span class="detail-value">${entry.status}</span>
            </div>
            <div class="detail-row">
                <span class="detail-label">Type:</span>
                <span class="detail-value">${entry.resourceType}</span>
            </div>
            <div class="detail-row">
                <span class="detail-label">Protocol:</span>
                <span class="detail-value">${entry.protocol || 'N/A'}</span>
            </div>
            <div class="detail-row">
                <span class="detail-label">Priority:</span>
                <span class="detail-value">${entry.priority || 'N/A'}</span>
            </div>
            ${entry.isThirdParty ? '<div class="detail-row"><span class="detail-value" style="color: orange;">⚠️ Third-Party Resource</span></div>' : ''}
            ${entry.renderBlocking ? '<div class="detail-row"><span class="detail-value" style="color: red;">🚫 Render Blocking</span></div>' : ''}
        </div>
        
        <div class="detail-section">
            <h3>Timing</h3>
            ${entry.timing.dns > 0 ? `<div class="detail-row"><span class="detail-label">DNS Lookup:</span><span class="detail-value">${entry.timing.dns.toFixed(2)} ms</span></div>` : ''}
            ${entry.timing.connect > 0 ? `<div class="detail-row"><span class="detail-label">Connection:</span><span class="detail-value">${entry.timing.connect.toFixed(2)} ms</span></div>` : ''}
            ${entry.timing.ssl > 0 ? `<div class="detail-row"><span class="detail-label">SSL:</span><span class="detail-value">${entry.timing.ssl.toFixed(2)} ms</span></div>` : ''}
            ${entry.timing.wait > 0 ? `<div class="detail-row"><span class="detail-label">Time to First Byte:</span><span class="detail-value">${entry.timing.wait.toFixed(2)} ms</span></div>` : ''}
            <div class="detail-row">
                <span class="detail-label">Total Time:</span>
                <span class="detail-value">${entry.timing.total.toFixed(2)} ms</span>
            </div>
        </div>
        
        <div class="detail-section">
            <h3>Size</h3>
            <div class="detail-row">
                <span class="detail-label">Transfer Size:</span>
                <span class="detail-value">${formatBytes(entry.size.transferSize)}</span>
            </div>
            <div class="detail-row">
                <span class="detail-label">Resource Size:</span>
                <span class="detail-value">${formatBytes(entry.size.resourceSize)}</span>
            </div>
            ${entry.size.compressionRatio < 1 ? `
            <div class="detail-row">
                <span class="detail-label">Compression:</span>
                <span class="detail-value">${(entry.size.compressionRatio * 100).toFixed(1)}% (${formatBytes(entry.size.resourceSize - entry.size.transferSize)} saved)</span>
            </div>` : ''}
        </div>
    `;
    
    document.getElementById('dialogContent').innerHTML = content;
    document.getElementById('requestDialog').style.display = 'block';
    document.getElementById('dialogOverlay').style.display = 'block';
}

function setupEventListeners() {
    // Filter buttons
    document.querySelectorAll('.filter-btn').forEach(btn => {
        btn.addEventListener('click', () => {
            document.querySelectorAll('.filter-btn').forEach(b => b.classList.remove('active'));
            btn.classList.add('active');
            currentFilter = btn.dataset.type;
            renderWaterfall();
        });
    });
    
    // Close dialog
    document.getElementById('closeDialog').addEventListener('click', closeDialog);
    document.getElementById('dialogOverlay').addEventListener('click', closeDialog);
}

function closeDialog() {
    document.getElementById('requestDialog').style.display = 'none';
    document.getElementById('dialogOverlay').style.display = 'none';
}

function truncateUrl(url, maxLength) {
    if (url.length <= maxLength) return url;
    const parts = url.split('/');
    return parts[parts.length - 1].substring(0, maxLength) + '...';
}

function formatBytes(bytes) {
    if (bytes === 0) return '0 B';
    const k = 1024;
    const sizes = ['B', 'KB', 'MB', 'GB'];
    const i = Math.floor(Math.log(bytes) / Math.log(k));
    return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
}

// Initialize on page load
document.addEventListener('DOMContentLoaded', init);