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Q = document.querySelector.bind(document);
QA = document.querySelectorAll.bind(document);
function text(msg) { return document.createTextNode(msg); }
function clearNode(node) { while (node.firstChild) node.removeChild(node.firstChild); }
function toTimestamp(seconds) {
var seconds = Math.floor(seconds);
var minutes = Math.floor(seconds/60);
var seconds = seconds % 60;
var hours = Math.floor(minutes/60);
var 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);
}
var cur_track_idx = 0;
function getActiveTranscriptTrackIdx() {
let textTracks = Q("video").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 Q("video").textTracks[getActiveTranscriptTrackIdx()]; }
function getDefaultTranscriptTrackIdx() {
let textTracks = Q("video").textTracks;
return textTracks.length - 1;
}
function doXhr(url, callback=null) {
var 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) {
var 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;
document.body.appendChild(textArea);
textArea.focus();
textArea.select();
try {
var successful = document.execCommand('copy');
var msg = successful ? 'successful' : 'unsuccessful';
console.log('Copying text command was ' + msg);
} catch (err) {
console.log('Oops, unable to copy');
}
document.body.removeChild(textArea);
}
window.addEventListener('DOMContentLoaded', function() {
cur_track_idx = getDefaultTranscriptTrackIdx();
});
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