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index_v2.html
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index_v2.html
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<html>
<head>
<style type="text/css">
body { background-color: #000; }
.sselem { position: fixed; top: 0; left: 0; background-position: center; background-size: cover; height: 100%; width: 100%; }
#c_a { z-index: 10; background-image: url("/assets/signage_imgs/blank.png"); }
#c_b { z-index: -9; background-image: url("/assets/signage_imgs/blank.png"); }
.hidden { display: none; }
</style>
<script src="/js/papa.js" language="javascript"></script>
<script language="javascript">
var monitorId = 'bar';
var slideshowPos = 0;
var playlist = [];
var enaSlides = [];
var plhash = ''; // not a hash just now, just a JSON string
var curFrame = 'c_a';
var nextFrame = 'c_b';
function updatePlaylist() {
var ds = Date.now();
Papa.parse("/assets/signage_imgs/"+monitorId+".txt?ts="+ds, {
download: true,
dynamicTyping: true,
skipEmptyLines: true,
complete: function(results) {
if (Array.isArray(results.data)) {
playlist = results.data;
if (JSON.stringify(results.data) != plhash) {
plhash = JSON.stringify(playlist);
updateEnabledSlides();
if (playlist.length > 0) {
prepNextSlide(0);
}
}
}
}
});
}
function updateEnabledSlides() {
// if there's a time frame for this, check it's valid
var date = new Date();
var tm = String(date.getMinutes()).padStart(2, "0");
var th = String(date.getHours()).padStart(2, "0");
var currentTime = th+tm;
var newEnaSlides = [];
for (var i in playlist) {
// start / end time
if (playlist[i].length > 6) {
var validFrom = parseInt(playlist[i][5]);
var validTo = parseInt(playlist[i][6]);
if (validTo == 0) { validTo = 2400; }
if (currentTime >= validFrom || currentTime <= validTo) {
newEnaSlides.push(i);
}
} else {
newEnaSlides.push(i);
}
}
enaSlides = JSON.parse(JSON.stringify(newEnaSlides));
}
async function prepNextSlide(i) {
if (curFrame == 'c_a') { nextFrame = 'c_b'; }
if (curFrame == 'c_b') { nextFrame = 'c_a'; }
var newImageUrl = '/assets/signage_imgs/'+playlist[enaSlides[i]][1];
document.getElementById(nextFrame).style.opacity = 0; // should already be 0, but be sure.
document.getElementById(nextFrame).src = '/assets/signage_imgs/'+playlist[enaSlides[i]][1];
imgPreload(newImageUrl).then(() => {
document.getElementById(nextFrame).style.backgroundImage = 'url('+newImageUrl+')';
});
}
async function swapSlides(transtype, intFade = 600) {
if (curFrame == 'c_a') { nextFrame = 'c_b'; }
if (curFrame == 'c_b') { nextFrame = 'c_a'; }
return new Promise((resolve, reject) => {
// snap (we have to change frame to ensure it loads properly, no flicker)
if (transtype == 'f') {
// fade through black (we don't need to change the frame here, but do for consistency)
document.getElementById(nextFrame).style.transition = 'opacity '+intFade/1000+'s linear';
document.getElementById(curFrame).style.transition = 'opacity '+intFade/1000+'s linear';
document.getElementById(curFrame).style.opacity = 0; // should already be 0, but be sure.
setTimeout(function() {
document.getElementById(nextFrame).style.zIndex = 100; // move this on top
document.getElementById(nextFrame).style.opacity = 1;
document.getElementById(curFrame).style.zIndex = -1;
curFrame = nextFrame;
resolve('');
}, intFade+200);
} else if (transtype == 'x') {
document.getElementById(nextFrame).style.transition = 'opacity '+intFade/1000+'s linear';
document.getElementById(curFrame).style.transition = 'opacity '+intFade/1000+'s linear';
setTimeout(function() {
document.getElementById(nextFrame).style.zIndex = 100; // move this on top
document.getElementById(nextFrame).style.opacity = 1;
document.getElementById(curFrame).style.opacity = 0;
document.getElementById(curFrame).style.zIndex = -1;
curFrame = nextFrame;
resolve('');
}, intFade+200);
} else if (transtype == 's') {
// set the image in the next frame
document.getElementById(nextFrame).style.transition = 'opacity 0s';
document.getElementById(curFrame).style.transition = 'opacity 0s';
document.getElementById(nextFrame).style.opacity = 0; // should already be 0, but be sure.
document.getElementById(nextFrame).style.zIndex = 100; // move this on top
document.getElementById(nextFrame).style.opacity = 1;
document.getElementById(curFrame).style.opacity = 0;
document.getElementById(curFrame).style.zIndex = -1;
curFrame = nextFrame;
resolve('');
}
});
}
function imgPreload(src) {
return new Promise((resolve, reject) => {
const image = new Image();
image.addEventListener('load', resolve);
image.addEventListener('error', reject);
image.src = src;
});
}
function nextSlide() {
// if we don't have any slides yet, ignore it until we do
if (enaSlides.length == 0) {
setTimeout(nextSlide, 1000);
return;
}
swapSlides(playlist[enaSlides[slideshowPos]][3]).then(function() {
// display this slide for as long as intended...
setTimeout(nextSlide, playlist[enaSlides[slideshowPos]][2]*1000);
// increment the counter
slideshowPos++;
// if we've reached the end of the list, start at the beginning again
if (enaSlides.length-1 < slideshowPos) {
slideshowPos = 0;
}
prepNextSlide(slideshowPos);
});
}
//
updatePlaylist();
updateEnabledSlides();
setInterval(updatePlaylist, 5000);
setInterval(updateEnabledSlides, 120000);
nextSlide();
</script>
</head>
<body>
<div class="sselem" id="c_a"></div>
<div class="sselem" id="c_b"></div>
<div class="hidden"><img id="buf" src="#"></div>
</body>
</html>