51 lines
1.3 KiB
JavaScript
51 lines
1.3 KiB
JavaScript
function synchroniseBackgroundWithAudio(bgi, target) {
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var cnt = document.getElementById(target || 'BackgroundImage') || document.getElementById('container'),
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bga = document.getElementById('BackgroundAudio'),
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rdy = false,
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bgs = [];
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if(!cnt)
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return;
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var computed = getComputedStyle(cnt);
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if(computed.backgroundImage && target !== 'ForegroundImage')
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bgs = computed.backgroundImage.split(',');
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if(!bga) {
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bgs.splice(0, 0, 'url(' + bgi + ')');
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cnt.style.backgroundImage = bgs.join(',');
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return;
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}
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var onReady = function(url) {
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bgs.splice(0, 0, 'url(' + url + ')');
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cnt.style.backgroundImage = bgs.join(',');
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bga.play();
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};
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bga.addEventListener('canplay', function() {
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rdy = true;
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});
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bga.pause();
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bga.currentTime = 0;
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var xhr = new XMLHttpRequest;
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xhr.responseType = 'blob';
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xhr.onreadystatechange = function() {
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if(xhr.readyState !== 4)
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return;
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bgi = URL.createObjectURL(xhr.response);
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if(rdy)
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onReady(bgi);
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else
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bga.addEventListener('canplay', function() {
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onReady(bgi);
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});
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};
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xhr.open('GET', bgi);
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xhr.send();
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}
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