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ChatGPT Preserve Prompt Textarea

To preserve last typed prompt messages for chat being switched

  1. // ==UserScript==
  2. // @name        ChatGPT Preserve Prompt Textarea
  3. // @namespace   UserScript
  4. // @match       https://chat.openai.com/*
  5. // @grant       none
  6. // @version     0.1.4
  7. // @author      CY Fung
  8. // @license     MIT
  9. // @run-at      document-idle
  10. // @description To preserve last typed prompt messages for chat being switched
  11. // ==/UserScript==
  12.  
  13. (() => {
  14.   let tzz = 0;
  15.   let jKey = null;
  16.   let jValue = null;
  17.   let isValid = () => { return false; }
  18.   const map = new Map();
  19.   (async () => {
  20.     let wPathname = null;
  21.     while (true) {
  22.       await new Promise(r => requestAnimationFrame(r));
  23.       let sPathname = location.pathname;
  24.       if (wPathname === sPathname) continue;
  25.       wPathname = sPathname;
  26.  
  27.       const vKey = jKey;
  28.       const vValue = jValue;
  29.       if (vKey) {
  30.         Promise.resolve().then(() => {
  31.           map.set(vKey, vValue);
  32.         });
  33.       }
  34.       jKey = null;
  35.       jValue = null;
  36.  
  37.       let tid = tzz;
  38.       isValid = () => { return false }
  39.       let expired = Date.now() + 200;
  40.       while (Date.now() < expired) {
  41.         let textarea = document.querySelector('textarea#prompt-textarea');
  42.         if (textarea && !textarea.value) break;
  43.         if (location.pathname !== sPathname) break;
  44.         await new Promise(r => requestAnimationFrame(r));
  45.         if (tid !== tzz) break;
  46.       }
  47.       if (location.pathname !== sPathname) continue;
  48.       expired = Date.now() + 80;
  49.       let s = map.get(location.pathname);
  50.       if (s) {
  51.         while (Date.now() < expired) {
  52.           let textarea = document.querySelector('textarea#prompt-textarea');
  53.           if (!textarea) break;
  54.           if (location.pathname !== sPathname) break;
  55.           if (textarea.value !== s && tid === tzz) textarea.value = s;
  56.           await new Promise(r => requestAnimationFrame(r));
  57.           if (tid !== tzz) break;
  58.         }
  59.         let textarea = document.querySelector('textarea#prompt-textarea');
  60.         if (textarea && tid === tzz) {
  61.           textarea.focus();
  62.           textarea.value = '';
  63.           try {
  64.             document.execCommand("insertText", false, s)
  65.           } catch (e) {
  66.             textarea.value = s;
  67.           }
  68.         }
  69.       }
  70.       await new Promise(r => requestAnimationFrame(r));
  71.       if (location.pathname !== sPathname) continue;
  72.       ((pathname) => {
  73.         isValid = function () { return location.pathname === pathname }
  74.       })(location.pathname);
  75.       let textarea = document.querySelector('textarea#prompt-textarea');
  76.       if (textarea && textarea.value) {
  77.         map.set(location.pathname, textarea.value);
  78.       }
  79.     }
  80.   })();
  81.  
  82.   const eventHandler = (evt) => {
  83.     const target = (evt || 0).target;
  84.     if ((target || 0).id !== 'prompt-textarea') return;
  85.     if (++tzz > 1e9) tzz = 9;
  86.     if (isValid()) {
  87.       jKey = location.pathname;
  88.       jValue = target.value;
  89.     }
  90.   }
  91.  
  92.   document.addEventListener('keydown', eventHandler, true);
  93.   document.addEventListener('keyup', eventHandler, true);
  94.   document.addEventListener('change', eventHandler, true);
  95. })();

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