Showing a component outside a container with hidden overflow

My <table> is scrollable by being enclosed in a fixed height <div>.

The dropdown component within the <table> (blue container in the 2nd column of the 1st row in the image and JSFIDDLE link provided below) is currently hidden behind the parent <div>. I want it to show all available options instead.

JSFIDDLE (example)

How can I move the dropdown component outside the containing <div> to display all options as shown in the image?

If I remove the pRelative container, the dropdown becomes fully visible - but it no longer scrolls along with its parent container when I scroll.

Appreciate any CSS/javascript solutions. Thank you.

PS: Solutions using only CSS and JavaScript are preferred.

javascripthtmlcss

Answer №1

Modify the positioning of the dropdown to fixed and manage scrolling behavior using JavaScript, as illustrated below.

var main = document.getElementsByClassName('main')[0];
var dd = document.getElementsByClassName('pAbsolute')[0];
var offset = dd.getBoundingClientRect().top;
main.onscroll = function() {
  var st = main.scrollTop;
  ddt = (offset - st);
  dd.style.top = ddt + 'px';
}
.main {
  height: 100px;
  overflow-y: scroll;
  overflow-x: hidden;
}
.pRelative {
  position: relative;
}
.pAbsolute {
  position: fixed;
}
.dropdown {
  width: 100px;
  background-color: cornflowerblue;
  z-index: 1000;
}
.option {
  border-top: 1px solid green;
  border-bottom: 1px solid green;
}
table td {
  border: 1px solid black;
  padding: 10px;
}
<div class="main">
  <table>
    <tr>
      <td>row1 column1</td>
      <td>
        <div class="pRelative">
          <div class="pAbsolute dropdown">
            <div class="option">Zero</div>
            <div class="option">One</div>
            <div class="option">Two</div>
            <div class="option">Three</div>
            <div class="option">Four</div>
            <div class="option">Five</div>
            <div class="option">Six</div>
          </div>
        </div>
      </td>
      <td>row1 column3</td>
    </tr>
    <tr>
      <td>row2 column1</td>
      <td>row2 column2</td>
      <td>row2 column3</td>
    </tr>
    <tr>
      <td>row3 column1</td>
      <td>row3 column2</td>
      <td>row3 column3</td>
    </tr>
    <tr>
      <td>row4 column1</td>
      <td>row4 column2</td>
      <td>row4 column3</td>
    </tr>
    <tr>
      <td>row5 column1</td>
      <td>row5 column2</td>
      <td>row5 column3</td>
    </tr>
    <tr>
      <td>row6 column1</td>
      <td>row6 column2</td>
      <td>row6 column3</td>
    </tr>
    <tr>
      <td>row7 column1</td>
      <td>row7 column2</td>
      <td>row7 column3</td>
    </tr>
    <td;>row8 column1</td>;
    <td;>row8 column2</td>;
    <td;>row8 column3</td>;
  	<tr/>
  </table>
</div>

Demo

Update

To address the margin-top issue, establish a new stacking context.

(tested only in safari 6.1 mac - unfortunately doesn't works in any latest browsers) Updated Demo or Another Demo

Update

The only viable cross-browser solution found for hiding the overflow of fixed elements is by clipping the container (this requires it to be a positioned element)

var main = document.getElementsByClassName('main')[0];
var dd = document.getElementsByClassName('pAbsolute')[0];
var offset = dd.getBoundingClientRect().top;
main.onscroll = function() {
  var st = main.scrollTop;
  ddt = (offset - st);
  dd.style.top = ddt + 'px';
}
.main {
  height: 100px;
  overflow-y: scroll;
  overflow-x: hidden;
  margin-top: 100px;
  position: absolute;
  clip: rect(auto, auto, 99999px, auto);
}
.pRelative {
  position: relative;
}
.pAbsolute {
  position: fixed;
}
.dropdown {
  width: 100px;
  background-color: cornflowerblue;
  z-index: 1000;
}
.option {
  border-top: 1px solid green;
  border-bottom: 1px solid green;
}
table td {
  border: 1px solid black;
  padding: 10px;
}
<div class="main">
  <table>
    <tr>
      <td>row1 column1</td>
      <td>
        <div class="pRelative">
          <div class="pAbsolute dropdown">
            <div class="option">Zero</div>
            <div class="option">One</div>
            <div class="option">Two</div>
            <div class="option">Three</div>
            <div class="option">Four</div>
            <div class="option">Five</div>
            <div class="option">Six</div>
          </div>
        </div>
      </td>
      <td>row1 column3</td>
    </tr>
    <tr>
      <td>row2 column1</td>
      <td>row2 column2</td>
      <td>row2 column3</td>
    </tr>
    <tr>
      <td>row3 column1</td>
      <td>row3 column2</td>
      <td>row3 column3</td>
    </tr>
    <tr>
      <td>row4 column1</td>
      <td>row4 column2</td>
      <td>row4 column3</td>
    </tr>
    <tr>
      <td>row5 column1</td>
      <td>row5 column2</td>
      <td>row5 column3</td>
    </tr>
    <tr>
      <td>row6 column1</td>
      <td>row6 column2</td>
      <td>row6 column3</td>
    </tr>
    <tr>
      <td>row7 column1</td>
      <td>row7 column2</td>
      <td>row7 column3</td>
    </tr>
    <td;>row8 column1</td>;
    <td;>row8 column2</td>;
    <td;>row8 column3</td>;
  	<tr/>
  </table>
</div>

Demo

Answer №2

To achieve the desired functionality, you can utilize a traditional <select> dropdown menu:

See Example in Action

<div class="content">
    <table>
        <tr>
            <td>Row 1 Column 1</td>
            <td>
                <select class="dropdown-menu">
                    <option class="menu-option">Option A</option>
                    <option class="menu-option">Option B</option>
                    <option class="menu-option">Option C</option>
                    <option class="menu-option">Option D</option>
                    <option class="menu-option">Option E</option>
                    <option class="menu-option">>Option F</option>
                </select>
            </td>
            <td>Row 1 Column 3</td>
        </tr>

Answer №3

If the dropdown is nested within a parent element with class .main, achieving this using only CSS is not feasible. This limitation arises from the fact that the .main container has been styled with overflow-y: scroll; You can't have it both ways in this scenario.

Answer №4

The issue at hand is the desire for the drop-down to break free from its parent element while still maintaining a relationship with it. Unfortunately, as far as I know, this is not achievable.

By positioning the drop-down absolutely, you essentially anchor it to the closest element with a position: relative in its immediate parental hierarchy. If no such element exists, then it defaults to the html element. There is a workaround where omitting top/bottom/left/right values will cause the element to position itself in its original inline location.

As a result, removing the relatively positioned wrapper allows the absolutely positioned drop-down to "break free" from the constraints of overflow-y: hidden; within .main (as it now binds to the html element). Consequently, its placement remains unaffected unless the html-element is scrolled.

In contrast, having a relatively positioned wrapper inside .main results in the drop-down being clipped like any other content within that container.

Answer №5

Does this meet your requirements? Check it out here

Here is the HTML code snippet:

<td class="hover">hh
  <ul>
    <li>0</li>
    <li>1</li>
    <li>2</li>
    <li>3</li>      
  </ul>
</td>

And here is the corresponding CSS code:

td.hover {
    text-align: left;
    list-style: none;        
}
td.hover ul {
    padding: 0;
    position: absolute;
    top: 28px;
    width: 150px;       
    opacity: 0;
    visibility: hidden;       
}
td.hover ul li {
    background: #555;
    display: block;
    color: #fff;
    text-shadow: 0 -1px 0 #000;
}
td.hover ul li:hover {
    background: #666;
}
td.hover:hover ul {
    display: block;
    opacity: 1;
    visibility: visible;
}

Answer №6

give this a shot,


   <div class="section">
    <table>
        <tr>
            <td>row1 column1</td>
            <td>
                <div class="pRelative">
                    <div class="pAbsolute dropdown">
                        <div class="option">Zero</div>
                        <div class="option">One</div>
                        <div class="option">Two</div>
                        <div class="option">Three</div>
                        <div class="option">Four</div>
                        <div class="option">Five</div>
                        <div class="option">Six</div>
                    </div>
                </div>
            </td>
            <td>row1 column3</td>
        </tr>
        <tr>
            <td>row2 column1</td>
            <td>row2 column2</td>
            <td>row2 column3</td>
        </tr>
        <tr>
            <td>row3 column1</td>
            <td>row3 column2</td>
            <td>row3 column3</td>
        </tr>
        <tr>
            <td>row4 column1</td>
            <td>row4 column2</td>
            <td>row4 column3</td>
        </tr>
        <tr>
            <td>row5 column1</td>
            <td>row5 column2</td>
            <td>row5 column3</td>
        </tr>
        <tr>
            <td>row6 column1</td>
            <td>row6 column2</td>
            <td>row6 column3</td>
        </tr>
        <tr>
            <td>row7 column1</td>
            <td>row7 column2</td>
            <td>row7 column3</td>
        </tr>
        <td>row8 column1</td>
            <td>row8 column2</td>
            <td>row8 column3</td>
        </tr>
    </table>
</div>


**Css**


body{
  position:relative;
}
.section {
    height: 100px;
    overflow-y: scroll;
    overflow-x: hidden;
}

.pAbsolute {
    position: absolute;
}
.dropdown {
    width: 100px;
    background-color: cornflowerblue;
    z-index: 1000;
}
.option {
    border-top: 1px solid green;
    border-bottom: 1px solid green;
}

table td{
    border: 1px solid black;
    padding: 10px;
}

Answer №7

Give this technique a try, but make sure to experiment on your own.

Switch Your Class From Position :relative To Position Fixed .

.pRelative {
    position: fixed;
}

Check out the DEMO here

Answer №8

Are you looking for something like this?

Check out the FIDDLE

I made a change by deleting the position:relative from the .pRelative class.

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