youtube fronendHEADmaster

1 files changed, 116 insertions, 0 deletions

diff --git a/youtube/static/js/common.js b/youtube/static/js/common.js
new file mode 100644
index 0000000..599d578
--- /dev/null
+++ b/youtube/static/js/common.js
@@ -0,0 +1,116 @@
+const Q = document.querySelector.bind(document);
+const QA = document.querySelectorAll.bind(document);
+const QId = document.getElementById.bind(document);
+let seconds,
+    minutes,
+    hours;
+function text(msg) { return document.createTextNode(msg); }
+function clearNode(node) { while (node.firstChild) node.removeChild(node.firstChild); }
+function toTimestamp(seconds) {
+  seconds = Math.floor(seconds);
+
+  minutes = Math.floor(seconds/60);
+  seconds = seconds % 60;
+
+  hours = Math.floor(minutes/60);
+  minutes = minutes % 60;
+
+  if (hours) {
+    return `0${hours}:`.slice(-3) + `0${minutes}:`.slice(-3) + `0${seconds}`.slice(-2);
+  }
+  return `0${minutes}:`.slice(-3) + `0${seconds}`.slice(-2);
+}
+
+let cur_track_idx = 0;
+function getActiveTranscriptTrackIdx() {
+    let textTracks = QId("js-video-player").textTracks;
+    if (!textTracks.length) return;
+    for (let i=0; i < textTracks.length; i++) {
+        if (textTracks[i].mode == "showing") {
+            cur_track_idx = i;
+            return cur_track_idx;
+        }
+    }
+    return cur_track_idx;
+}
+function getActiveTranscriptTrack() { return QId("js-video-player").textTracks[getActiveTranscriptTrackIdx()]; }
+
+function getDefaultTranscriptTrackIdx() {
+  let textTracks = QId("js-video-player").textTracks;
+  return textTracks.length - 1;
+}
+
+function doXhr(url, callback=null) {
+    let xhr = new XMLHttpRequest();
+    xhr.open("GET", url);
+    xhr.onload = (e) => {
+      callback(e.currentTarget.response);
+    }
+    xhr.send();
+    return xhr;
+}
+
+// https://stackoverflow.com/a/30810322
+function copyTextToClipboard(text) {
+  let textArea = document.createElement("textarea");
+
+  //
+  // *** This styling is an extra step which is likely not required. ***
+  //
+  // Why is it here? To ensure:
+  // 1. the element is able to have focus and selection.
+  // 2. if element was to flash render it has minimal visual impact.
+  // 3. less flakyness with selection and copying which **might** occur if
+  //    the textarea element is not visible.
+  //
+  // The likelihood is the element won't even render, not even a
+  // flash, so some of these are just precautions. However in
+  // Internet Explorer the element is visible whilst the popup
+  // box asking the user for permission for the web page to
+  // copy to the clipboard.
+  //
+
+  // Place in top-left corner of screen regardless of scroll position.
+  textArea.style.position = 'fixed';
+  textArea.style.top = 0;
+  textArea.style.left = 0;
+
+  // Ensure it has a small width and height. Setting to 1px / 1em
+  // doesn't work as this gives a negative w/h on some browsers.
+  textArea.style.width = '2em';
+  textArea.style.height = '2em';
+
+  // We don't need padding, reducing the size if it does flash render.
+  textArea.style.padding = 0;
+
+  // Clean up any borders.
+  textArea.style.border = 'none';
+  textArea.style.outline = 'none';
+  textArea.style.boxShadow = 'none';
+
+  // Avoid flash of white box if rendered for any reason.
+  textArea.style.background = 'transparent';
+
+
+  textArea.value = text;
+
+  let parent_el = video.parentElement;
+  parent_el.appendChild(textArea);
+  textArea.focus();
+  textArea.select();
+
+  try {
+    let successful = document.execCommand('copy');
+    let msg = successful ? 'successful' : 'unsuccessful';
+    console.log('Copying text command was ' + msg);
+  } catch (err) {
+    console.log('Oops, unable to copy');
+  }
+
+  parent_el.removeChild(textArea);
+}
+
+
+window.addEventListener('DOMContentLoaded', function() {
+    cur_track_idx = getDefaultTranscriptTrackIdx();
+});