youtube-timestamp.ts

README.md

You can add this to Roam using {{[[roam/js]]}}

Grab the code in youtube-timestamps.js and drop it in a javascript code block:

  ```javascript```

You can have timestamps at the beginning of any nested block. H:MM:SS

You can use the ctrl+shift+y hotkey (currently assumes you have Roam42 installed, let me know if you'd prefer I drop that requirement) to grab the current timestamp of the video you're cursor is nested under and add it to the beginning of your block.

youtube-timestamps.ts

window.players = {}

scanYouTube = (event, observer) => {
  event.forEach((mutation) => {
    if (mutation.type == "childList") {
      mutation.addedNodes.forEach((node) => {
        if (node.nodeType == Node.ELEMENT_NODE) {
          node.querySelectorAll("iframe[src*='youtube.com']:not([src*='enablejsapi'])").forEach( (element)=>{
            switchYouTube(element);
          })
        }
      })
    }
  })
}

switchYouTube = (element) => {
  const pathParts = new URL(element.src).pathname.split("/");
  const youtubeid = pathParts[pathParts.length - 1];
  const blockContainer = element.closest('.roam-block-container');
  const block = element.closest('.roam-block');
  if (!block) { return; }
  const parent = element.parentElement;
  console.log(element);
  console.log(block);
  full_id = block.id + "-" + youtubeid;
  blockContainer.dataset.full_id = full_id;
  blockContainer.dataset.youtube = true;
  parent.id = full_id;
  element.remove();
  const player = new window.YT.Player(parent.id, {
    height: '300', width: '450', videoId: youtubeid
  });
  const iframe = player.getIframe();
  players[full_id] = player;
  iframe.dataset.youtubeid = youtubeid
  console.log("Found Youtube ID: " + youtubeid );
  setTimeout(()=>{
    addTimestampControls(blockContainer, block.id, player)
  }, 200);
  height = 300;
  width = 450;
  buttonDiv = document.createElement('div');
  for (i of [1.2,1.5,2]) {
    console.log(i);
    const multiplier = i;
    const button = document.createElement('button');
    button.innerText = multiplier.toString();
    button.addEventListener('click', () => {
      console.log("Setting height: " + multiplier * height + "; width: " + multiplier * width);
      iframe.height = multiplier * height;
      iframe.width = multiplier * width;
    });
    button.style.marginRight = '8px';
    buttonDiv.appendChild(button);
  }
  block.parentElement.parentElement.appendChild(buttonDiv);
}

addTimestampControls = (blockContainer, blockID, player) => {
  const getTimestampAddButton = (event, observer) => {
    if (Array.from(event[0].removedNodes).some((el) => { return el.id == blockID})) {
      console.log("block was removed: " + blockID);
      observer.disconnect();
      removeButtons();
    } else {
      console.log(event);
      addButtons();
    }
  }
  const removeButtons = () => {
    blockContainer.querySelectorAll(":scope .roam-block-container .roam-block[data-youtubets]").forEach(child => {
      child.parentElement.querySelector('button[data-youtubets="' + child.dataset.youtubets + '"]').remove();
      delete child.dataset.youtubets;
    });
  }
  const addButtons = () => {
    blockContainer.querySelectorAll(":scope .roam-block-container .roam-block:not([data-youtubets])").forEach(child => {
      const timestamp = getTimestamp(child);
      if (timestamp != null) {
        child.dataset.iframe_id = player.getIframe().id;
        child.dataset.youtubets = timestamp;
        addControlButton(child, timestamp, () => {
          player.seekTo(timestamp, true)
          pState = player.getPlayerState();
          if (pState == -1 || pState == 0 || pState == 2) {
            player.playVideo();
          }
        });
      }
    });
  }
  addButtons();
  const x = new MutationObserver(getTimestampAddButton);
  x.observe(blockContainer, {
    childList: true,
    subtree: true
  });
};

getTimestamp = (block) => {
  const matches = block.textContent.match(/^((?:\d+:)?\d+:\d\d)($|\D)/);
  if (!matches || matches.length < 2) return null;
  const timeParts = matches[1].split(':').map(part => parseInt(part));
  if (timeParts.length == 3) return timeParts[0]*3600 + timeParts[1]*60 + timeParts[2];
  else if (timeParts.length == 2) return timeParts[0]*60 + timeParts[1];
  else return null;
}

addControlButton = (block, timestamp, fn) => {
  const button = document.createElement('button');
  button.innerText = '►';
  button.addEventListener('click', fn);
  button.style.marginRight = '8px';
  button.dataset.youtubets = timestamp;

  const printElement = (e) => {
    if (Array.from(e[0].removedNodes).some((el) => { return el.id == block.id})) {
      console.log("Removed Nodes: ");
      console.log(e[0].removedNodes);
      button.remove();
    }
  }
  const x = new MutationObserver(printElement);
  x.observe(block.parentElement, { childList: true });
  block.parentElement.insertBefore(button, block);
};

if (document.querySelectorAll("html > script[src*='https://www.youtube.com/iframe_api']").length == 0) {
  console.log("Load Youtube API");
  const tag = document.createElement('script');
  tag.src = 'https://www.youtube.com/iframe_api';
  const htmlEl = document.getElementsByTagName('html')[0];
  htmlEl.appendChild(tag);
}

if (document.querySelectorAll("head > script[src='https://craig.global.ssl.fastly.net/js/mousetrap/mousetrap.min.js?a4098']").length == 0) {
  console.log("Installing Mousetrap");
  const tag = document.createElement('script');
  tag.src = 'https://craig.global.ssl.fastly.net/js/mousetrap/mousetrap.min.js?a4098';
  const htmlEl = document.getElementsByTagName('head')[0];
  htmlEl.appendChild(tag);
}

window.onYouTubeIframeAPIReady = () => {
  document.querySelectorAll("iframe[src*='youtube.com']:not([src*='enablejsapi'])").forEach( (element)=>{
    switchYouTube(element);
  })

  const observerYouTube = new MutationObserver(scanYouTube);
  observerYouTube.observe(document.querySelector('.roam-body-main'), {
    childList: true,
    subtree: true
  });
}

setTimeout(()=>{
  // Add bindGlobal
  (function(a){var c={},d=a.prototype.stopCallback;a.prototype.stopCallback=function(e,b,a,f){return this.paused?!0:c[a]||c[f]?!1:d.call(this,e,b,a)};a.prototype.bindGlobal=function(a,b,d){this.bind(a,b,d);if(a instanceof Array)for(b=0;b<a.length;b++)c[a[b]]=!0;else c[a]=!0};a.init()})(Mousetrap);
  console.log("Set up hotkey");
  Mousetrap.bindGlobal('ctrl+shift+y', (event, handler) => {
    console.log("Getting timestamp");
    event.preventDefault()
    if (event.srcElement.localName == "textarea") {
      bc = event.srcElement.closest('.roam-block-container[data-youtube=true]');
      player = players[bc.dataset.full_id];
      var timeStr = new Date(player.getCurrentTime() * 1000).toISOString().substr(11, 8)
      console.log(timeStr);
   
      var newValue = timeStr + " " + event.srcElement.innerHTML;
      document.getElementById(event.srcElement.id).value = newValue;
      return false;
    }
  });  
},1000);