How to Create a Dynamic Tooltip with Fade-in/Fade-out Effects for a Div Element?

Add a Dynamic Tooltip to a div Element

Question:

Consider a div element with a label and an input field:

<div>
  <label>Name</label>
  <input type="text">
</div>

How do you create a tooltip that appears when users hover over the div element, with a subtle fade-in/fade-out effect?

Answer:

For basic tooltips that display a static message, you can utilize the title attribute:

<div title="This is my tooltip">
<p>However, for tooltips with dynamic text and animated fade effects, a more advanced approach is required:</p>
<ol>
<li>Create a CSS animation for the tooltip.</li>
<li>Add a JS event listener to handle the hover events.</li>
<li>Create a tooltip DOM element and position it relative to the div.</li>
<li>Add/remove the tooltip by applying the CSS animation when hovering/removing hover.</li>
</ol>
<p>Here's an example using JavaScript and CSS:</p>
<pre class="brush:php;toolbar:false">.tooltip {
  display: none;
  position: absolute;
  padding: 10px;
  color: white;
  border: 1px solid black;
  opacity: 0;
  transition: all 0.2s;
}

.tooltip.show {
  display: block;
  opacity: 1;
}

// Create a tooltip element
const tooltip = document.createElement('span');
tooltip.classList.add('tooltip');

// Add the event listener to the div
const div = document.querySelector('div');
div.addEventListener('mouseover', (e) => {
  // Set the tooltip text
  tooltip.textContent = 'This is my tooltip';

  // Position the tooltip
  tooltip.style.left = e.x + 'px';
  tooltip.style.top = e.y + 'px';

  // Add the tooltip to the body
  document.body.appendChild(tooltip);

  // Add the show class to the tooltip
  tooltip.classList.add('show');
});

div.addEventListener('mouseout', () => {
  // Remove the tooltip from the body
  document.body.removeChild(tooltip);
});