What is the best way to enable an element to overflow within a block-level element?

Is it possible to have vertical scrolling in a bootstrap table while also allowing certain elements to expand and overflow the entire table on hover?

I am facing an issue where setting tbody { display: block } for vertical scrolling prevents the expanding element from overflowing the table on hover. Instead, it gets hidden behind the thead.

I have tried using relative and absolute positioning as well as adjusting z-index values, but nothing seems to work. The desired behavior is demonstrated when hovering over a green td item in the snippet provided below.

If you enable scrolling in the tbody, the expanding element no longer appears above the thead. How can this be resolved without sacrificing the vertical scrolling functionality of the tbody?

Answer №1

To meet that specific need, you can utilize the css transform-origin Property.

.element:hover {
    background-size: 100% 100%;
    transform: scale(6, 6);
    transform-origin: center;
    transition: all 0.5s ease-in-out;
    z-index: 999;

    transform-origin: 54% 14%;
}

Answer №2

Your td element is currently hidden by the thead due to overflow in the tbody. To resolve this, try setting the overflow property on the table container instead of the tbody.

.card-body {
    /* Try setting overflow here */
    height: 200px;
    overflow-y: scroll;
    overflow-x: hidden;
}

.element {
    background-color: green;
}

.element:hover {
    background-size: 100% 100%;
    transform: scale(6, 6);
    transform-origin: center;
    transition: all 0.5s ease-in-out;
    z-index: 999;
}
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet"/>
<div class="card col-8 offset-2 p-0 mt-5">
  <div class="card-body p-0">
    <table class="table table-striped">
      <thead class="thead-dark">
        <tr class="row m-0">
          <th class="col-3" scope="col">#</th>
          <th class="col-3" scope="col">First</th>
          <th class="col-3" scope="col">Second</th>
          <th class="col-3" scope="col">Third</th>
        </tr>
      </thead>
      <tbody>
        <tr class="row m-0">
          <th class="col-3" scope="row">1</th>
          <td class="col-3">Blah</td>
          <td class="col-3 element">Blah</td>
          <td class="col-3">Blah</td>
        </tr>
        <tr class="row m-0">
          <th class="col-3" scope="row">2</th>
          <td class="col-3">Blah</td>
          <td class="col-3">Blah</td>
          <td class="col-3">Blah</td>
        </tr>
        <tr class="row m-0">
          <th class="col-3" scope="row">3</th>
          <td class="col-3">Blah</td>
          <td class="col-3">Blah</td>
          <td class="col-3">Blah</td>
        </tr>
        <tr class="row m-0">
          <th class="col-3" scope="row">4</th>
          <td class="col-3">Blah</td>
          <td class="col-3">Blah</td>
          <td class="col-3">Blah</td>
        </tr>
        <tr class="row m-0">
          <th class="col-3" scope="row">5</th>
          <td class="col-3">Blah</td>
          <td class="col-3">Blah</td>
          <td class="col-3">Blah</td>
        </tr>
        <tr class="row m-0">
          <th class="col-3" scope="row">6</th>
          <td class="col-3">Blah</td>
          <td class="col-3">Blah</td>
          <td class="col-3">Blah</td>
        </tr>
      </tbody>
    </table>
  </div>
</div>

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