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Show content on hover (does not affect card height)
P粉289775043
P粉289775043 2024-03-27 20:29:28
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I have a block that contains content that displays on hover. The way the effect should work is:

  • .hoverCard The basic content is displayed by default (the content in .hoverCard__showOnHover is hidden) The user hovers over .hoverCard, at which point .hoverCard__showOnHover displays its contents and .hoverCard__body transitions up (giving it an "open" effect)
  • You can see the visual effects of the above in my demo, but I can't get the animation to work perfectly.

The problem I encountered is:

  • Use visibility:hidden, opacity:0 and height:0 to still reserve space for .hoverCard__showOnHover. This means that if, by default, .hoverCard__body has a bottom padding of 40px and .hoverCard__showOnHover has a height of 100px, there will be no need for the user to hover over .hoverCard i.e. 140px of space is visible
  • The only way I know of to prevent space reservation is to use display: none. However, I need to give it a display property to display the content when I hover over the card, which would give the card a jumping effect (because height is introduced on hover). In addition to this, the height of my card will also grow (I want the effect of the content showing up and opening upwards, rather than the .hoverCard growing like in the demo)
  • To try and solve the above problem, I tried using GSAP to gradually give the .hoverCard__showOnHover height. But no luck as it still has the above issue

Is there any way to solve this problem? Not necessarily using GSAP, I just tried GSAP to try to solve the above problem. 

const hoverCard = document.querySelector('.hoverCard');
const hoverCardBodyShowOnHover = document.querySelector('.hoverCard__showOnHover');

hoverCard.addEventListener('mouseenter', function() {
  gsap.to(hoverCardBodyShowOnHover, { duration: 0.5, display: 'block', height: 'auto', ease: 'power4.out' });
});

hoverCard.addEventListener('mouseleave', function() {
  gsap.to(hoverCardBodyShowOnHover, { duration: 0.5, height: 0, ease: 'power4.out', onComplete: function() {
    this.targets()[0].style.display = 'none';
  }});
});
:root {
  --black: #000000;
  --white: #ffffff;
  --yellow: #FFE775;
}

/* general */
body {
  font-family: "Poppins", sans-serif;
  background-color: var(--white);
  color: var(--black);
}

section {
  margin: 100px 0 300px 0;
}

/* card */
.hoverCard {
  margin-bottom: 15px;
  width: 100%;
  border-radius: 8px;
  overflow: hidden;
  background-color: var(--black);
  color: var(--white);
  border: 1px solid var(--black);
}
.hoverCard * {
  transition: all 0.5s ease;
}
.hoverCard:hover .hoverCard__body {
  transform: translateY(-75px);
}
.hoverCard:hover .hoverCard__body .hoverCard__showOnHover {
  opacity: 1;
  visibility: visible;
  display: block;
  height: auto;
  transform: translateY(75px);
}
.hoverCard__header {
  height: 350px;
  background-color: var(--yellow);
}
.hoverCard__showOnHover {
  display: none;
  height: 0;
  overflow: hidden;
}
.hoverCard__body {
  width: 100%;
  padding: 30px 30px 40px 30px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.11.3/gsap.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.0.2/css/bootstrap.min.css" rel="stylesheet">

<section>
  <div class="container">
    <div class="row">

      <div class="col-12 col-md-6">
        <article class="hoverCard position-relative">
          <div class="hoverCard__header">
            <!-- img here -->
          </div>
          <div class="hoverCard__body">
            <div class="hoverCard__body-text">Subheader</div>
            <div class="hoverCard__showOnHover">
              <p>This will show on hover Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
            </div>
          </div>
        </article>
      </div>

       <div class="col-12 col-md-6">
        <article class="hoverCard position-relative">
          <div class="hoverCard__header">
             <!-- img here -->
           </div>
          <div class="hoverCard__body">
            <div class="hoverCard__body-text">Subheader 2</div>
            <div class="hoverCard__showOnHover">
              <p>This will show on hover</p>
            </div>
          </div>
        </article>
      </div>


      
    </div>
  </div>
</section>

Here’s what the default version of the card looks like visually (shown on the right card) and how the hover interaction works (left card):

Note that the height of the card does not increase. Instead, the body moves up (within the card) to reveal the content.

edit:

Based on Kooilnc’s answer: 

:root {
  --black: #000000;
  --white: #ffffff;
  --yellow: #FFE775;
}

/* general */
body {
  background-color: var(--white);
  color: var(--black);
}

section {
  margin: 100px 0 300px 0;
}

/* card */
.hoverCard {
  margin-bottom: 15px;
  width: 100%;
  border-radius: 8px;
  overflow: hidden;
  background-color: var(--black);
  color: var(--white);
  border: 1px solid var(--black);
  position: relative; /* added */ 
}
.hoverCard * {
  transition: all 0.5s ease;
}
.hoverCard:hover .hoverCard__body {
  transform: translateY(-75px);
}
.hoverCard:hover .hoverCard__body .hoverCard__showOnHover {
  /* opacity: 1;
  visibility: visible;
  display: block;
  height: */ auto;
  overflow: initial; /* added */ 
  height: auto; /* added */ 
  max-height: 100px; /* added */ 
  transform: translateY(75px);
}
.hoverCard__header {
  height: 200px;
  background-color: var(--yellow);
}
.hoverCard__showOnHover {
  overflow: hidden;
  max-height: 0; /* added */ 
  transition: max-height 0.5s ease-in-out; /* added */ 
  overflow: hidden;  /* added */ 
}
.hoverCard__body {
  width: 100%;
  padding: 30px 30px 40px 30px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.11.3/gsap.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.0.2/css/bootstrap.min.css" rel="stylesheet">

<section>
  <div class="container">
    <div class="row">

      <div class="col-6">
        <article class="hoverCard position-relative">
          <div class="hoverCard__header">
            <!-- img here -->
          </div>
          <div class="hoverCard__body">
            <div class="hoverCard__body-text">Subheader</div>
            <div class="hoverCard__showOnHover">
              <p>This will show on hover Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
            </div>
          </div>
        </article>
      </div>

       <div class="col-6">
        <article class="hoverCard position-relative">
          <div class="hoverCard__header">
             <!-- img here -->
           </div>
          <div class="hoverCard__body">
            <div class="hoverCard__body-text">Subheader 2</div>
            <div class="hoverCard__showOnHover">
              <p>This will show on hover</p>
            </div>
          </div>
        </article>
      </div>


      
    </div>
  </div>
</section>

Also, do we need to define a number for max-height: 100px;? What if the content size is unknown and needs to be dynamic?

Edit 2

Latest method:

:root{
  --white: #FFFFFF;
  --black: #000000;
  --yellow: #FFE775;
}

section{
  padding: 150px 0;
}

.hoverCard {
  margin-bottom: 15px;
  width: 100%;
  border-radius: 8px;
  overflow: hidden;
  padding-bottom: 180px; // seems I need this to maintain height
  background-color: var(--black);
  color: var(--white);
  border: 1px solid var(--black);
  
  /* only on non touch devices
  ================================== */

  @media (hover: hover) {
    * {
      transition: all 0.5s ease;
    }

    &:hover {
      .hoverCard__body {
        transform: translateY(-75px);
      }
      .hoverCard__showOnHover {
        display: block;
        max-height: none;
        overflow: visible;
      }
    }
  }

  &__showOnHover {
    display: none;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease-in-out;
  }

  /* only on touch devices
  ================================== */

  @media (pointer: coarse) {
    &__showOnHover {
      margin-bottom: 30px;
    }
  }

  /* =============================== */

  &__header {
    height: 350px;
    background-color: var(--yellow);
  }

  &__body {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 30px 30px 0px 30px;
    color: var(--white);
    background-color: var(--black);

    &-text {
      margin-bottom: 60px;
    }

  }
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.11.3/gsap.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.0.2/css/bootstrap.min.css" rel="stylesheet">

<section>
  <div class="container">
    <div class="row">

      <div class="col-6">
        <article class="hoverCard position-relative">
          <div class="hoverCard__header">
            <!-- img here -->
          </div>
          <div class="hoverCard__body">
            <div class="hoverCard__body-text">Subheader</div>
            <div class="hoverCard__showOnHover">
              <p>This will show on hover Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
            </div>
          </div>
        </article>
      </div>

       <div class="col-6">
        <article class="hoverCard position-relative">
          <div class="hoverCard__header">
             <!-- img here -->
           </div>
          <div class="hoverCard__body">
            <div class="hoverCard__body-text">Subheader 2</div>
            <div class="hoverCard__showOnHover">
              <p>This will show on hover</p>
            </div>
          </div>
        </article>
      </div>


      
    </div>
  </div>
</section>

Pass the above content:

  • This results in unnecessary space above .hoverCard__body (which should only fill the top 30px).
  • Entry animation jump (the content has just appeared, the translation is not smooth)
  • The height of the exit animation also jumps down quickly (because the display none attribute is in effect)

P粉289775043
P粉289775043

reply all(1)
P粉760675452
P粉7606754522024-03-28 11:47:55 1 floor

The

trick is to set the text to be displayed to max-height: 0 and overflow: hide. This is a minimal reproducible example. 

body {
  margin: 1rem;
  font-family: system-ui, sans-serif;
}

.item {
  position: relative;
  overflow: hidden;
  margin-right: 0.8rem;
  width: 150px;
  float: left;
  border: 1px solid #777;
  border-radius: 3px;
}

.item.first {
  background: url("https://upload.wikimedia.org/wikipedia/commons/d/d0/Queen_Clementia_of_Hungary.jpg") no-repeat top left;
  background-size: cover;
  height: 150px;
}

.collapsible {
  height: inherit;
  width: inherit;
  position: absolute;
  bottom: 0;
}

.collapsible .header {
  background-color: #EEE;
  color: #000;
  text-align: center;
  font-weight: bold;
  font-size: 0.9rem;
  cursor: pointer;
  bottom: 0;
  width: 100%;
  position: absolute;
  opacity: 0.8;
}

.item .collapsible .collapsibleTxt {
  max-height: 0;
  text-align: left;
  font-size: initial;
  color: #444;
  overflow: hidden;
  padding: 4px;
  font-weight: normal;
  transition: max-height 0.5s ease-in-out;
}

.header:hover  .collapsibleTxt {
  overflow: initial;
  height: auto;
  max-height: 100px;
}

  

    
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