endlessmonument/index.html at master · jrladd/endlessmonument · GitHub

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<!DOCTYPE html>
<html>
<head>
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=IM+Fell+English:ital@0;1&display=swap" rel="stylesheet">
<style>
html {
  font-size: 5vmin;
  font-family: 'IM Fell English', serif;
}
h1 {
  font-size: .75rem;
  color: #990000;
  font-family: 'IM Fell English', serif;
  font-style: italic;
  float: left;
}
form {
  font-size: .5rem;
  float: right;
  color: #666;
}
p {
  padding: 30vh 0;
  width: 70%;
  margin: auto;
  text-align: center;
  font-size: 1.5rem;
  color: #333;
}
footer {
  position:absolute;
  bottom:0;
  right:0;
  font-size: .5rem;
  color: #888;
  text-align: right;
}
a {
  color: #990000;
  text-decoration: none;
}
</style>
</head>
<body>

<h1>Endless Monument</h1>
<form id="yearType">
  <input type="radio" id="diurnal" name="yearType" value="diurnal" checked>
  <label for="diurnal">Diurnal</label><br>
  <input type="radio" id="sidereal" name="yearType" value="sidereal">
  <label for="sidereal">Sidereal</label><br>
</form>
<p id="longline">Loading correct line...</p>
<footer>Loading footer...</footer>

</body>
<script>

// Initialize year type
let typeOfYear = document.querySelector('input[name=yearType]:checked').value;

// URLs for poem segments
const longlinesURL = 'https://raw.githubusercontent.com/jrladd/endlessmonument/master/longlines.txt'
const shortlinesURL = 'https://raw.githubusercontent.com/jrladd/endlessmonument/master/shortlines.txt'
const poemURL = 'https://raw.githubusercontent.com/jrladd/endlessmonument/master/epithalamion.txt'

// Retrieve a file as a Promise
const getFile = (url) => {
    return new Promise(function (resolve, reject) {
      var xhr = new XMLHttpRequest();
      xhr.open('get', url, true);
      xhr.onload = function () {
        var status = xhr.status;
        if (status == 200) {
          resolve(xhr.responseText);
        } else {
          reject(status);
        }
      };
      xhr.send();
    });
}

const getLine = async () => {
  // Get each poem and split
  let longlines = await getFile(longlinesURL);
  longlines = longlines.split('\n');
  let shortlines = await getFile(shortlinesURL);
  shortlines = shortlines.split('\n');
  let poem = await getFile(poemURL);
  poem = poem.split('\n');
  // Display yesterday's line unless it's time
  let line = longlines[indexDaysSinceMarch1-1];
  let shortline = getShortline(longlines[indexDaysSinceMarch1],shortlines,poem)
  console.log(`Today's shortline: ${shortline}`)
  // Check diurnal/sidereal selection
  if (typeOfYear === 'diurnal') {
    switchTime = diurnalSwitchTime;
  } else {
    switchTime = siderealSwitchTime;
  }
  // Shortline should appear 15 mins after switch time
  let shortlineSwitchTime = switchTime+15
  // If it's time, display today's line
  // 15 mins after that, display today's line and the short line, if there is one
  if (minutesSinceMidnight >= shortlineSwitchTime & shortline !== null) {
    line = `${longlines[indexDaysSinceMarch1]}<br>${shortline}`
  } else if (minutesSinceMidnight >= switchTime) {
    line = longlines[indexDaysSinceMarch1];
  }
  // Insert line into HTML
  document.getElementById("longline").innerHTML = line;
}

// Check if the next line in the poem is a short line
const getShortline = (longline,shortlines,poem) => {
  longlineId = poem.indexOf(longline)
  nextLine = poem[longlineId+1]
  if (shortlines.indexOf(nextLine)) {
    return nextLine;
  } else {
    return null;
  }
}

const today = new Date(); // Today's date
// The number of days since March 1 (beginning at 0)
let indexDaysSinceMarch1 = Math.floor((today - new Date(today.getFullYear(), 2, 1)) /1000/60/60/24)
// Handle January and February
if (today.getMonth() < 2) { indexDaysSinceMarch1 = 365 + indexDaysSinceMarch1; }
// The number of minutes since midnight
let minutesSinceMidnight = today.getHours()*60 + today.getMinutes()
// The length of the day in seconds
let diurnal_day_in_seconds=24*60*60
let sidereal_day_in_seconds=23*60*60+56*60+4.0916
// The time of day that the line should switch
let diurnalSwitchTime=Math.floor((indexDaysSinceMarch1*(diurnal_day_in_seconds/365))/60)
let siderealSwitchTime=Math.floor((indexDaysSinceMarch1*(diurnal_day_in_seconds/360))/60)
if (typeOfYear === 'diurnal') {
  let switchTime = diurnalSwitchTime;
} else {
  let switchTime = siderealSwitchTime;
}

// Print values to console for easy reference
console.log(`Days since March 1: ${indexDaysSinceMarch1}`);
console.log(`Minutes since midnight: ${minutesSinceMidnight}`)
console.log(`Today's diurnal switch time: ${diurnalSwitchTime}`)

// Retrieve proper line(s)
getLine();

// Event listener for year type radio buttons
const yearType = () => {
  typeOfYear = document.querySelector('input[name=yearType]:checked').value;
  getLine();
  document.querySelector("footer").innerHTML = `Showing the ${typeOfYear} line of Spenser's Epithalamion for ${today}. Refresh to update. <a target='blank' href='https://jrladd.com/endless-monument-2.html'>Learn more.</a>`;
}

document.getElementById("yearType").addEventListener('change', yearType);

// Add footer text for time of day
document.querySelector("footer").innerHTML = `Showing the ${typeOfYear} line of Spenser's Epithalamion for ${today}. Refresh to update. <a target='blank' href='https://jrladd.com/endless-monument-2.html'>Learn more.</a>`;
</script>
</html>