How to Show Details on Hover in HTML with CSS?

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Hover effects in web development are excellent for providing additional information without cluttering the user interface. In this article, we'll explore how to display extra details when hovering over a table cell (<td>) in an Angular application. We'll use simple HTML and CSS techniques to achieve this.

Understanding the Basics of Hover Effects


When we talk about hover effects in CSS, we're essentially referring to styles that change when a user places their mouse over an element. In our case, we want to show more information when the user hovers over a cell containing an item's name.

The HTML Structure


Given the requirement, we have the following HTML structure for our Angular application:

<tr *ngFor="let item of collection.data | paginate: config">
<th scope="row">
<div class="custom-control custom-checkbox">
<input type="checkbox" class="custom-control-input" [attr.id]="item.id">
<label class="custom-control-label" [attr.for]="item.id"></label>
</div>
</th>
<td>{{item.name}}
<span class="tooltip">{{item.details}}</span>
</td>
</tr>


In this code snippet, {{item.details}} refers to the details we want to display when the user hovers over the item name in the table cell.

CSS for Hover Effect


To display the details effectively, let's style the tooltip with CSS. Here’s how you can do it:

td {
position: relative; /* Positioning for the tooltip */
}

.tooltip {
display: none; /* Hide the tooltip by default */
position: absolute;
background: rgba(0, 0, 0, 0.7);
color: #fff;
padding: 5px;
border-radius: 4px;
z-index: 10;
top: 100%; /* Position the tooltip below the hovered element */
left: 50%;
transform: translateX(-50%); /* Center the tooltip */
white-space: nowrap;
}

td:hover .tooltip {
display: block; /* Show the tooltip when hovering */
}

Explanation of the CSS

• Positioning: We set the <td> to relative to allow absolute positioning of the tooltip. The tooltip itself is styled to be hidden initially.
• Tooltip Appearance: The .tooltip class styles ensure that the tooltip’s background is semi-transparent black with white text, providing clarity against various backgrounds.
• Hover Effect: When hovering over the <td>, we change the display property of the .tooltip class to block, thus revealing the tooltip.

Final Implementation


Combining the HTML and CSS, your Angular table code will look like this:

<table>
<tr *ngFor="let item of collection.data | paginate: config">
<th scope="row">
<div class="custom-control custom-checkbox">
<input type="checkbox" class="custom-control-input" [attr.id]="item.id">
<label class="custom-control-label" [attr.for]="item.id"></label>
</div>
</th>
<td>{{item.name}}
<span class="tooltip">{{item.details}}</span>
</td>
</tr>
</table>

Testing the Implementation


To see the results, you can serve your Angular application and hover over the names in the table. You should see the details displayed cleanly below the names. This approach allows users to view essential information without navigating away or opening additional pop-ups.

Frequently Asked Questions:

What if the tooltip overlaps with other elements?


To prevent any overlap, consider adjusting its position using top and left values accordingly or using media queries for responsive designs.

Can I customize the tooltip further?


Absolutely! You can modify the style of the tooltip by adding more CSS properties like box-shadow, font-size, and transitions for a smoother display effect.

Is there a JavaScript alternative for tooltips?


, you can use libraries like Tippy.js or create custom tooltips using JavaScript frameworks but the CSS approach is sufficient for simple applications.

By implementing these hover effects, you can enhance user experiences significantly while keeping your UI clean. Enjoy coding!

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