80 lines
2 KiB
HTML
80 lines
2 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<meta charset="utf-8">
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<style>
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body {
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height: 2000px;
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/* make body scrollable, the tooltip should work after the scroll */
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}
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.tooltip {
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position: fixed;
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padding: 10px 20px;
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border: 1px solid #b3c9ce;
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border-radius: 4px;
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text-align: center;
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font: italic 14px/1.3 arial, sans-serif;
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color: #333;
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background: #fff;
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box-shadow: 3px 3px 3px rgba(0, 0, 0, .3);
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}
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</style>
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</head>
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<body>
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<p>LaLaLa LaLaLa LaLaLa LaLaLa LaLaLa LaLaLa LaLaLa LaLaLa LaLaLa</p>
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<p>LaLaLa LaLaLa LaLaLa LaLaLa LaLaLa LaLaLa LaLaLa LaLaLa LaLaLa</p>
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<button data-tooltip="the tooltip is longer than the element">Short button</button>
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<button data-tooltip="HTML<br>tooltip">One more button</button>
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<p>Scroll the page to make buttons appear on the top, check if the tooltips show up correctly.</p>
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<script>
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let tooltipElem;
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document.onmouseover = function(event) {
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let target = event.target;
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// if we have tooltip HTML...
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let tooltipHtml = target.dataset.tooltip;
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if (!tooltipHtml) return;
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// ...create the tooltip element
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tooltipElem = document.createElement('div');
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tooltipElem.className = 'tooltip';
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tooltipElem.innerHTML = tooltipHtml;
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document.body.append(tooltipElem);
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// position it above the annotated element (top-center)
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let coords = target.getBoundingClientRect();
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let left = coords.left + (target.offsetWidth - tooltipElem.offsetWidth) / 2;
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if (left < 0) left = 0; // don't cross the left window edge
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let top = coords.top - tooltipElem.offsetHeight - 5;
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if (top < 0) { // if crossing the top window edge, show below instead
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top = coords.top + target.offsetHeight + 5;
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}
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tooltipElem.style.left = left + 'px';
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tooltipElem.style.top = top + 'px';
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};
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document.onmouseout = function(e) {
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if (tooltipElem) {
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tooltipElem.remove();
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tooltipElem = null;
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}
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};
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</script>
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</body>
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</html>
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