Prevent Gradient Overlay From Scrolling

I am trying to put a small gradient on the bottom of a scrolling div. I've based my solution on the accepted answer to this SO thread. The gradient shows up fine, but when I scro

Solution 1:

Because your element is positioned absolute, it's position is absolute to the parent element so when you scroll it scrolls with your content. What you want is your ul to scroll. I have quickly rewritten yours, but below I've got a simplified and cleaned up version:

.resultListContainer {
    border: 1px solid #000;
    height: 400px;
    width: 40em;
    font-size: 1em;
    position: relative;
}

.resultListContainer::before {
    background-image: linear-gradient( top, rgba( 255, 255, 255, 0 ) 0%, rgba( 255, 255, 255, 1 ) 100% );
    background-image: -moz-linear-gradient( top, rgba( 255, 255, 255, 0 ) 0%, rgba( 255, 255, 255, 1 ) 100% );
    background-image: -ms-linear-gradient( top, rgba( 255, 255, 255, 0 ) 0%, rgba( 255, 255, 255, 1 ) 100% );
    background-image: -o-linear-gradient( top, rgba( 255, 255, 255, 0 ) 0%, rgba( 255, 255, 255, 1 ) 100% );
    background-image: -webkit-linear-gradient( top, rgba( 255, 255, 255, 0 ) 95%, rgba( 255, 255, 255, 1 ) 100% );
    content: "\00a0";
    height: 100%;
    position: absolute;
    width: 100%;
  z-index: 2;
  pointer-events: none;
}

.result {
  position: absolute;
  left: 0;
  top: 0;
  margin: 0;
  box-sizing: border-box;
  z-index: 1;
    width: 100%;
    height: 100%;
    margin-bottom: 0;
    padding-top: 5px;
    padding-bottom: 5px;
    padding-left: 5px;
    list-style-type: none;
    overflow-y: scroll;
}

.result li {
  height: 100px;
  background: red;
}

<div class="resultListContainer">
    <ul class="result">
        <li><span class="resultPermitNumber resultElement">B123456789</span></li>
        <li><span class="resultPermitType resultElement">FINAL</span></li>
        <li><span class="resultDisplayAddress resultElement">41975 LOUDOUN CENTER PL SE, LEESBURG, VA 20175</span></li>
        <li><span class="resultPermitNumber resultElement">B123456789</span></li>
        <li><span class="resultPermitType resultElement">FINAL</span></li>
        <li><span class="resultDisplayAddress resultElement">41975 LOUDOUN CENTER PL SE, LEESBURG, VA 20175</span></li>
        <li><span class="resultPermitNumber resultElement">B123456789</span></li>
        <li><span class="resultPermitType resultElement">FINAL</span></li>
        <li><span class="resultDisplayAddress resultElement">41975 LOUDOUN CENTER PL SE, LEESBURG, VA 20175</span></li>
    </ul>
    <!-- Lots more of the ul. -->
</div>

Basically there are two things that are important: your outer box cannot be scrollable, you inner box can. All the fixed elements need to be outside your inner box (which is your ul in this case). Secondly, your :before cannot be 100% high, as it will absorb your mouse events, preventing scrolling. For all browsers except IE you can solve this by using pointer-events: none, but otherwise the safest way is to make your gradient a fixed height and your :before element the height of the gradient you want, resulting in a (in this case) 20px area that would not take your mouse events at the bottom.

html, body { height: 100%; } body { padding: 0; margin: 0; }
div {
  width: 400px;
  height: 400px;
  max-height: 100%;
  position: relative;
}

div:before, div ul {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
}

div:before {
  background: linear-gradient(0deg, rgba(255,255,255,1), rgba(255,255,255,0));
  background-size: 100% 100%;
  height: 20px;
  z-index: 2;
  /* IE does not support pointer events, so making this small in height is important
  as your scroll events will not be passed to the ul if it is covered by your :before */
  pointer-events: none;
  content: '';
  display: block;
}

div ul {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow-y: scroll;
  z-index: 1;
}

div li {
  width: 100%;
  height: 100px;
  background: #ececec;
}

div li:nth-child(2n){
  background: #cecece;
}

<div>
    <ul>
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
        <li>6</li>
        <li>7</li>
    </ul>
</div>

Solution 2:

You need to wrap your container in another div that is positioned as relative.

Also, overlay will block your scroll bar, so instead of width: 100% I used: left:0; right: 16px; - now scroll is clickable.

Try my fiddle: https://fiddle.jshell.net/8c6k4k6d/1/

Solution 3:

replace

.resultListContainer::before

with

.resultListContainer .result:last-of-type::before