kcl-digital-humanities-garden/_includes/link-previews.html

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2021-03-11 03:33:55 +00:00
<!-- That file is not particularly elegant. This will need a refactor at some point. -->
<div style="opacity: 0; display: none;" id='tooltip-wrapper'>
<div id='tooltip-content'>
</div>
</div>
<iframe style="display: none; height: 0; width: 0;" id='link-preview-iframe' src="">
</iframe>
<script>
var opacityTimeout;
var contentTimeout;
var transitionDurationMs = 100;
var iframe = document.getElementById('link-preview-iframe')
var tooltipWrapper = document.getElementById('tooltip-wrapper')
var tooltipContent = document.getElementById('tooltip-content')
function hideTooltip() {
opacityTimeout = setTimeout(function() {
tooltipWrapper.style.opacity = 0;
contentTimeout = setTimeout(function() {
tooltipContent.innerHTML = '';
tooltipWrapper.style.display = 'none';
}, transitionDurationMs + 1);
}, transitionDurationMs)
}
function showTooltip(event) {
var elem = event.target;
var elem_props = elem.getClientRects()[elem.getClientRects().length - 1];
var top = window.pageYOffset || document.documentElement.scrollTop
if (event.target.host === window.location.host) {
iframe.src = event.target.href
iframe.onload = function() {
tooltipContentHtml = ''
tooltipContentHtml += '<div style="font-weight: bold;">' + iframe.contentWindow.document.querySelector('h1').innerHTML + '</div>'
tooltipContentHtml += iframe.contentWindow.document.querySelector('content').innerHTML
tooltipContent.innerHTML = tooltipContentHtml
tooltipWrapper.style.display = 'block';
setTimeout(function() {
tooltipWrapper.style.opacity = 1;
}, 1)
}
tooltipWrapper.style.left = elem_props.left - (tooltipWrapper.offsetWidth / 2) + (elem_props.width / 2) + "px";
if ((window.innerHeight - elem_props.top) < (tooltipWrapper.offsetHeight)) {
tooltipWrapper.style.top = elem_props.top + top - tooltipWrapper.offsetHeight - 10 + "px";
} else if ((window.innerHeight - elem_props.top) > (tooltipWrapper.offsetHeight)) {
tooltipWrapper.style.top = elem_props.top + top + 35 + "px";
}
if ((elem_props.left + (elem_props.width / 2)) < (tooltipWrapper.offsetWidth / 2)) {
tooltipWrapper.style.left = "10px";
} else if ((document.body.clientWidth - elem_props.left - (elem_props.width / 2)) < (tooltipWrapper.offsetWidth / 2)) {
tooltipWrapper.style.left = document.body.clientWidth - tooltipWrapper.offsetWidth - 20 + "px";
}
}
}
function setupListeners(linkElement) {
linkElement.addEventListener('mouseleave', function(_event) {
hideTooltip();
});
tooltipWrapper.addEventListener('mouseleave', function(_event) {
hideTooltip();
});
linkElement.addEventListener('mouseenter', function(event) {
clearTimeout(opacityTimeout);
clearTimeout(contentTimeout);
showTooltip(event);
});
tooltipWrapper.addEventListener('mouseenter', function(event) {
clearTimeout(opacityTimeout);
clearTimeout(contentTimeout);
});
}
document.querySelectorAll('{{ include.wrapperQuerySelector }} a').forEach(setupListeners);
</script>