From 2c5dc24e3325f3ef8fc9fc9d52376681ad3e9fd4 Mon Sep 17 00:00:00 2001 From: "google-labs-jules[bot]" <161369871+google-labs-jules[bot]@users.noreply.github.com> Date: Fri, 24 Jul 2026 14:51:24 +0000 Subject: [PATCH] perf: optimize DOM updates for file previews Refactored the file input and preview rendering logic to prevent full DOM rebuilds when adding or removing files. This reduces the time to process 500 files incrementally from ~35s down to ~0.4s. Baseline benchmark for 500 files (add/remove): ~35263ms / ~39424ms Improved benchmark for 500 files (add/remove): ~409ms / ~127ms Co-authored-by: paul0728 <44644609+paul0728@users.noreply.github.com> --- .gitignore | 1 + benchmark.js | 83 ++++++++ benchmark_500.js | 83 ++++++++ docs/index.html | 118 ++++++----- package-lock.json | 515 ++++++++++++++++++++++++++++++++++++++++++++++ package.json | 5 + 6 files changed, 754 insertions(+), 51 deletions(-) create mode 100644 benchmark.js create mode 100644 benchmark_500.js create mode 100644 package-lock.json create mode 100644 package.json diff --git a/.gitignore b/.gitignore index 7a60b85..b4bc537 100644 --- a/.gitignore +++ b/.gitignore @@ -1,2 +1,3 @@ __pycache__/ *.pyc +node_modules/ diff --git a/benchmark.js b/benchmark.js new file mode 100644 index 0000000..36f13da --- /dev/null +++ b/benchmark.js @@ -0,0 +1,83 @@ +const fs = require('fs'); +const { JSDOM } = require('jsdom'); + +const html = fs.readFileSync('docs/index.html', 'utf8'); + +function extractScriptContext(htmlStr) { + const startIdx = htmlStr.indexOf(''); + return htmlStr.substring(startIdx, endIdx); +} + +const scriptContent = extractScriptContext(html); + +// We'll mock the DOM and some globals +const dom = new JSDOM(` +
+
+
+
+
+
+
+`, { runScripts: "outside-only" }); + +const window = dom.window; +const document = window.document; + +window.URL = { + createObjectURL: () => "blob:test", + revokeObjectURL: () => {} +}; +window.fetch = () => Promise.resolve({ ok: true, json: () => Promise.resolve([]) }); +window.alert = () => {}; + +// Remove imports from the script +const cleanedScript = scriptContent + .replace(/import .*/g, '') + .replace(/loadFormats\(\);/g, '') + .replace(/initWasm\(\);/g, ''); + +// Run the script in the context +window.eval(` + ${cleanedScript} + window.renderPreviews = renderPreviews; + window.selectedFiles = selectedFiles; + window.fileStatusText = fileStatusText; + window.previewContainer = previewContainer; + window.fileInput = fileInput; + + window.simulateAddFiles = (files) => { + const e = { target: { files: files } }; + // Trigger the listener + const event = new window.Event('change'); + Object.defineProperty(event, 'target', {writable: false, value: {files}}); + fileInput.dispatchEvent(event); + } +`); + +const numFiles = 100; +const mockFiles = Array.from({ length: numFiles }, (_, i) => ({ + name: `file${i}.jpg`, + type: 'image/jpeg' +})); + +console.log("Measuring Baseline for 100 files..."); + +let start = Date.now(); + +for (let i = 0; i < numFiles; i++) { + window.simulateAddFiles([mockFiles[i]]); +} + +let end = Date.now(); +console.log(`Time to add 100 files sequentially: ${end - start} ms`); + +start = Date.now(); +for (let i = numFiles - 1; i >= 0; i--) { + // We just call the remove button click for the last element + const removeBtn = window.previewContainer.lastChild.querySelector('.remove-btn'); + removeBtn.click(); +} +end = Date.now(); +console.log(`Time to remove 100 files sequentially: ${end - start} ms`); diff --git a/benchmark_500.js b/benchmark_500.js new file mode 100644 index 0000000..50d842a --- /dev/null +++ b/benchmark_500.js @@ -0,0 +1,83 @@ +const fs = require('fs'); +const { JSDOM } = require('jsdom'); + +const html = fs.readFileSync('docs/index.html', 'utf8'); + +function extractScriptContext(htmlStr) { + const startIdx = htmlStr.indexOf(''); + return htmlStr.substring(startIdx, endIdx); +} + +const scriptContent = extractScriptContext(html); + +// We'll mock the DOM and some globals +const dom = new JSDOM(` +
+
+
+
+
+
+
+`, { runScripts: "outside-only" }); + +const window = dom.window; +const document = window.document; + +window.URL = { + createObjectURL: () => "blob:test", + revokeObjectURL: () => {} +}; +window.fetch = () => Promise.resolve({ ok: true, json: () => Promise.resolve([]) }); +window.alert = () => {}; + +// Remove imports from the script +const cleanedScript = scriptContent + .replace(/import .*/g, '') + .replace(/loadFormats\(\);/g, '') + .replace(/initWasm\(\);/g, ''); + +// Run the script in the context +window.eval(` + ${cleanedScript} + window.renderPreviews = renderPreviews; + window.selectedFiles = selectedFiles; + window.fileStatusText = fileStatusText; + window.previewContainer = previewContainer; + window.fileInput = fileInput; + + window.simulateAddFiles = (files) => { + const e = { target: { files: files } }; + // Trigger the listener + const event = new window.Event('change'); + Object.defineProperty(event, 'target', {writable: false, value: {files}}); + fileInput.dispatchEvent(event); + } +`); + +const numFiles = 500; +const mockFiles = Array.from({ length: numFiles }, (_, i) => ({ + name: `file${i}.jpg`, + type: 'image/jpeg' +})); + +console.log("Measuring Baseline for 500 files..."); + +let start = Date.now(); + +for (let i = 0; i < numFiles; i++) { + window.simulateAddFiles([mockFiles[i]]); +} + +let end = Date.now(); +console.log(`Time to add 500 files sequentially: ${end - start} ms`); + +start = Date.now(); +for (let i = numFiles - 1; i >= 0; i--) { + // We just call the remove button click for the last element + const removeBtn = window.previewContainer.lastChild.querySelector('.remove-btn'); + removeBtn.click(); +} +end = Date.now(); +console.log(`Time to remove 500 files sequentially: ${end - start} ms`); diff --git a/docs/index.html b/docs/index.html index 9d406c0..3220232 100644 --- a/docs/index.html +++ b/docs/index.html @@ -183,21 +183,7 @@

Online Converter

} } - // Handle file selection - fileInput.addEventListener('change', (e) => { - if (e.target.files.length > 0) { - // Add new files to our array - selectedFiles = selectedFiles.concat(Array.from(e.target.files)); - renderPreviews(); - } - // Clear input so selecting the same file again triggers change event - fileInput.value = ''; - }); - - // Render thumbnails - function renderPreviews() { - previewContainer.innerHTML = ''; - + function updateFileStatusText() { if (selectedFiles.length === 0) { fileStatusText.textContent = "No file chosen"; } else if (selectedFiles.length === 1) { @@ -205,49 +191,79 @@

Online Converter

} else { fileStatusText.textContent = `${selectedFiles.length} files selected`; } + } - selectedFiles.forEach((file, index) => { - const wrapper = document.createElement('div'); - wrapper.className = 'thumbnail-wrapper'; - wrapper.title = file.name; - - // Create remove button - const removeBtn = document.createElement('button'); - removeBtn.className = 'remove-btn'; - removeBtn.innerHTML = '×'; - removeBtn.onclick = () => { + function createThumbnail(file) { + const wrapper = document.createElement('div'); + wrapper.className = 'thumbnail-wrapper'; + wrapper.title = file.name; + + // Create remove button + const removeBtn = document.createElement('button'); + removeBtn.className = 'remove-btn'; + removeBtn.innerHTML = '×'; + removeBtn.onclick = () => { + const index = selectedFiles.indexOf(file); + if (index > -1) { selectedFiles.splice(index, 1); - renderPreviews(); - }; - - // Create image preview - const img = document.createElement('img'); - img.className = 'thumbnail-img'; - - // If it's a standard web image, browsers can render it natively - if (file.type.startsWith('image/') && !file.name.toLowerCase().endsWith('.heic')) { - img.src = URL.createObjectURL(file); - img.onload = () => URL.revokeObjectURL(img.src); // Free memory - } else { - // Fallback for RAW/HEIC that browsers can't render natively - img.src = 'data:image/svg+xml;utf8,RAW/Data'; } + wrapper.remove(); + updateFileStatusText(); + }; + + // Create image preview + const img = document.createElement('img'); + img.className = 'thumbnail-img'; + + // If it's a standard web image, browsers can render it natively + if (file.type.startsWith('image/') && !file.name.toLowerCase().endsWith('.heic')) { + img.src = URL.createObjectURL(file); + img.onload = () => URL.revokeObjectURL(img.src); // Free memory + } else { + // Fallback for RAW/HEIC that browsers can't render natively + img.src = 'data:image/svg+xml;utf8,RAW/Data'; + } - wrapper.appendChild(img); - wrapper.appendChild(removeBtn); + wrapper.appendChild(img); + wrapper.appendChild(removeBtn); - // Overlay the name at the bottom - const nameLabel = document.createElement('div'); - nameLabel.className = 'thumbnail-name'; - nameLabel.style.position = 'absolute'; - nameLabel.style.bottom = '0'; - nameLabel.style.width = '100%'; - nameLabel.style.background = 'rgba(255,255,255,0.8)'; - nameLabel.textContent = file.name.length > 12 ? file.name.substring(0, 10) + '...' : file.name; + // Overlay the name at the bottom + const nameLabel = document.createElement('div'); + nameLabel.className = 'thumbnail-name'; + nameLabel.style.position = 'absolute'; + nameLabel.style.bottom = '0'; + nameLabel.style.width = '100%'; + nameLabel.style.background = 'rgba(255,255,255,0.8)'; + nameLabel.textContent = file.name.length > 12 ? file.name.substring(0, 10) + '...' : file.name; - wrapper.appendChild(nameLabel); - previewContainer.appendChild(wrapper); + wrapper.appendChild(nameLabel); + return wrapper; + } + + // Handle file selection + fileInput.addEventListener('change', (e) => { + if (e.target.files.length > 0) { + const newFiles = Array.from(e.target.files); + // Add new files to our array + selectedFiles = selectedFiles.concat(newFiles); + + // Append only new thumbnails + newFiles.forEach(file => { + previewContainer.appendChild(createThumbnail(file)); + }); + updateFileStatusText(); + } + // Clear input so selecting the same file again triggers change event + fileInput.value = ''; + }); + + // For backwards compatibility or any other potential usage + function renderPreviews() { + previewContainer.innerHTML = ''; + selectedFiles.forEach(file => { + previewContainer.appendChild(createThumbnail(file)); }); + updateFileStatusText(); } // 2. 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