Created
June 13, 2024 17:49
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TamperMonkey script to add HTML + CSS preview for when ChatGPT gives you HTML and CSS code blocks. Written by ChatGPT-4o.
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| // ==UserScript== | |
| // @name ChatGPT Code Preview | |
| // @namespace http://tampermonkey.net/ | |
| // @version 1.3 | |
| // @description Combine and preview HTML, CSS, and JS code blocks from ChatGPT | |
| // @author Wizulus | |
| // @match https://chatgpt.com/* | |
| // @grant none | |
| // ==/UserScript== | |
| (function() { | |
| 'use strict'; | |
| const getCodeBlocks = () => { | |
| const codeBlocks = { | |
| html: null, | |
| css: null, | |
| js: null | |
| }; | |
| document.querySelectorAll('div.markdown > pre').forEach(pre => { | |
| const languageSpan = pre.querySelector('span'); | |
| const codeElement = pre.querySelector('code'); | |
| if (languageSpan && codeElement) { | |
| const language = languageSpan.textContent.toLowerCase(); | |
| const code = codeElement.textContent; | |
| if (language === 'html') codeBlocks.html = code; | |
| if (language === 'css') codeBlocks.css = code; | |
| if (language === 'javascript' || language === 'js') codeBlocks.js = code; | |
| } | |
| }); | |
| return codeBlocks; | |
| }; | |
| const createIframe = (htmlString) => { | |
| let iframe = document.getElementById('codePreviewIframe'); | |
| if (!iframe) { | |
| iframe = document.createElement('iframe'); | |
| iframe.id = 'codePreviewIframe'; | |
| iframe.style.position = 'fixed'; | |
| iframe.style.top = '0'; | |
| iframe.style.left = '0'; | |
| iframe.style.width = '400px'; | |
| iframe.style.height = '300px'; | |
| iframe.style.border = '1px solid black'; | |
| iframe.style.zIndex = '9998'; | |
| iframe.style.resize = 'both'; | |
| iframe.style.overflow = 'auto'; | |
| document.body.appendChild(iframe); | |
| } | |
| const iframeDoc = iframe.contentDocument || iframe.contentWindow.document; | |
| iframeDoc.open(); | |
| iframeDoc.write(htmlString); | |
| iframeDoc.close(); | |
| }; | |
| const createCloseButton = () => { | |
| let closeButton = document.getElementById('closeIframeButton'); | |
| if (!closeButton) { | |
| closeButton = document.createElement('button'); | |
| closeButton.id = 'closeIframeButton'; | |
| closeButton.innerText = 'Close Preview'; | |
| closeButton.style.position = 'fixed'; | |
| closeButton.style.top = '82px'; | |
| closeButton.style.right = '10px'; | |
| closeButton.style.backgroundColor = '#000'; | |
| closeButton.style.color = '#fff'; | |
| closeButton.style.border = 'none'; | |
| closeButton.style.padding = '5px 10px'; | |
| closeButton.style.zIndex = '9999'; | |
| closeButton.style.cursor = 'pointer'; | |
| closeButton.onclick = () => { | |
| const iframe = document.getElementById('codePreviewIframe'); | |
| if (iframe) iframe.remove(); | |
| closeButton.remove(); | |
| }; | |
| document.body.appendChild(closeButton); | |
| } | |
| }; | |
| const createCombinedHTML = (codeBlocks) => { | |
| let combinedHTML; | |
| if (codeBlocks.html && codeBlocks.html.includes('<html')) { | |
| combinedHTML = codeBlocks.html.replace(/<link\s+[^>]*>/g, ''); | |
| if (codeBlocks.css) { | |
| combinedHTML = combinedHTML.replace('<head>', `<head><style>${codeBlocks.css}</style>`); | |
| } | |
| } else { | |
| combinedHTML = ` | |
| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <style>${codeBlocks.css || ''}</style> | |
| </head> | |
| <body> | |
| ${codeBlocks.html || ''} | |
| <script>${codeBlocks.js || ''}</script> | |
| </body> | |
| </html> | |
| `; | |
| } | |
| return combinedHTML; | |
| }; | |
| const previewCombinedCode = () => { | |
| const codeBlocks = getCodeBlocks(); | |
| const combinedHTML = createCombinedHTML(codeBlocks); | |
| createIframe(combinedHTML); | |
| createCloseButton(); | |
| }; | |
| const addButton = () => { | |
| let button = document.getElementById('previewCodeButton'); | |
| if (!button) { | |
| button = document.createElement('button'); | |
| button.id = 'previewCodeButton'; | |
| button.innerText = 'Preview Code'; | |
| button.style.position = 'fixed'; | |
| button.style.top = '42px'; | |
| button.style.right = '10px'; | |
| button.style.backgroundColor = '#000'; | |
| button.style.color = '#fff'; | |
| button.style.border = 'none'; | |
| button.style.padding = '5px 10px'; | |
| button.style.zIndex = '9999'; | |
| button.style.cursor = 'pointer'; | |
| button.onclick = previewCombinedCode; | |
| document.body.appendChild(button); | |
| } | |
| }; | |
| addButton(); | |
| })(); |
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