add transcript-table.js

1 files changed, 112 insertions, 0 deletions

diff --git a/youtube/static/js/transcript-table.js b/youtube/static/js/transcript-table.js
new file mode 100644
index 0000000..235b1e4
--- /dev/null
+++ b/youtube/static/js/transcript-table.js
@@ -0,0 +1,112 @@
+var details_tt, select_tt, table_tt;
+
+function renderCues() {
+  var tt = Q("video").textTracks[select_tt.selectedIndex];
+  let cuesL = [...tt.cues];
+
+  clearNode(table_tt);
+  console.log("render cues..", tt.cues.length);
+
+  var tt_type = cuesL[0].text.startsWith(" \n");
+  for (let i=0; i < cuesL.length; i++) {
+    let txt, startTime = tt.cues[i].startTime;
+    if (tt_type) {
+      if (i % 2) continue;
+      txt = tt.cues[i].text.split('\n')[1].replace(/<[\d:.]*?><c>(.*?)<\/c>/g, "$1");
+    } else {
+      txt = tt.cues[i].text;
+    }
+
+    let tr, td, a;
+    tr = document.createElement("tr");
+
+    td = document.createElement("td")
+    a = document.createElement("a");
+    a.appendChild(text(toMS(startTime)));
+    a.href = "javascript:;";  // TODO: replace this with ?t parameter
+    a.addEventListener("click", (e) => {
+      Q("video").currentTime = startTime;
+    })
+    td.appendChild(a);
+    tr.appendChild(td);
+
+    td = document.createElement("td")
+    td.appendChild(text(txt));
+    tr.appendChild(td);
+
+    table_tt.appendChild(tr);;
+  };
+
+  var lastActiveRow = null;
+  function colorCurRow(e) {
+    // console.log("cuechange:", e);
+    var idxC = cuesL.findIndex((c) => c == tt.activeCues[0]);
+    var idxT = tt_type ? Math.floor(idxC / 2) : idxC;
+
+    if (lastActiveRow) lastActiveRow.style.backgroundColor = "";
+    if (idxT < 0) return;
+    var row = table_tt.rows[idxT];
+    row.style.backgroundColor = "#0cc12e42";
+    lastActiveRow = row;
+  }
+  colorCurRow();
+  tt.addEventListener("cuechange", colorCurRow);
+}
+
+function loadCues() {
+  let tts = Q("video").textTracks;
+  let tt = tts[select_tt.selectedIndex];
+  for (let ttI of tts) if (ttI !== tt) ttI.mode = "disabled";
+  if (tt.mode == "disabled") tt.mode = "hidden";
+
+  var iC = setInterval(() => {
+    if (tt.cues && tt.cues.length) {
+      renderCues();
+      clearInterval(iC);
+    }
+  }, 100);
+}
+
+window.addEventListener('DOMContentLoaded', function() {
+  let tts = Q("video").textTracks;
+  if (!tts.length) return;
+
+  details_tt = document.createElement("details");
+  details_tt.addEventListener("toggle", () => {
+    if (details_tt.open) loadCues();
+  });
+
+  var s = document.createElement("summary");
+  s.appendChild(text("Transcript"));
+  details_tt.appendChild(s);
+
+  var divR = document.createElement("div");
+  select_tt = document.createElement("select");
+  for (let tt of tts) {
+    let option = document.createElement("option");
+    option.appendChild(text(tt.label));
+    select_tt.appendChild(option);
+  }
+  select_tt.addEventListener("change", loadCues);
+  divR.appendChild(select_tt);
+
+  table_tt = document.createElement("table");
+  table_tt.id = "transcript-table";
+  table_tt.appendChild(text("loading.."));
+  divR.appendChild(table_tt);
+
+  tts.addEventListener("change", (e) => {
+    console.log(e);
+    var idx = getActiveTranscriptTrackIdx();  // sadly not provided by 'e'
+    if (tts[idx].mode == "showing") {
+      select_tt.selectedIndex = idx;
+      loadCues();
+    }
+    else if (details_tt.open && tts[idx].mode == "disabled") {
+      tts[idx].mode = "hidden";  // so we still receive 'oncuechange'
+    }
+  })
+
+  details_tt.appendChild(divR);
+  Q(".side-videos").prepend(details_tt);
+});