Effortlessly create a seamless transition in background color opacity once the base image has finished

Question

Effortlessly create a seamless transition in background color opacity once the base image has finished

I've set up a div with a sleek black background. Upon page load, I trigger an API request for an image, which is then displayed in a secondary div positioned behind the main one. After this, I aim to smoothly transition the overlaying div's opacity so that the image beneath it becomes visible without affecting the content inside the overlaying div.

However, my current implementation is far from ideal: https://jsfiddle.net/n7t2xmha/3/

The animation lacks smoothness
The opacity adjustment is inaccurate
The text doesn't remain solid

Code:

<div class="outerdiv">
    <div class="innerdiv">
    </div>
    <p>
        content - should remain solid white
    </p>
</div>

.outerdiv {
    background-color: black;
    position: relative;
    display: block;
    height: 500px;
    width: 500px;
    color: white;
    -moz-transition: all 1s linear;
    -o-transition: all 1s linear;
    -webkit-transition: all 1s linear;
    transition: all 1s linear;
}

.outerdiv-opaque {
    opacity: 0.9 !important;
}

.innerdiv {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index=-1;
}

JS

var innerDiv = $('.innerdiv');
setTimeout(function() {
    innerDiv.css('background-image', 'url(https://i.sstatic.net/MxR09.png)');
    var outerdiv = $('.outerdiv');
    setTimeout(function() {
        outerdiv.addClass('outerdiv-opaque');
    }, 500);

}, 1000)

javascript jquery html css

Answer 1

Answer №1

Revise the timeouts functions to improve efficiency. Adjust the .outerdiv-opaque styling

   .outerdiv-opaque {
      background-color: white;
    }

Once you separate your timeOut functions, they will appear as follows:

    var innerDiv = $('.innerdiv');
setTimeout(function() {
  innerDiv.css('background-image', 'url(https://i.sstatic.net/MxR09.png)');
}, 1000)

 var outerdiv = $('.outerdiv');
  setTimeout(function() {
    outerdiv.addClass('outerdiv-opaque');
  }, 500);

Answer 2

Revise the timeouts functions to improve efficiency. Adjust the .outerdiv-opaque styling

   .outerdiv-opaque {
      background-color: white;
    }

Once you separate your timeOut functions, they will appear as follows:

    var innerDiv = $('.innerdiv');
setTimeout(function() {
  innerDiv.css('background-image', 'url(https://i.sstatic.net/MxR09.png)');
}, 1000)

 var outerdiv = $('.outerdiv');
  setTimeout(function() {
    outerdiv.addClass('outerdiv-opaque');
  }, 500);

Answer 3

Answer №2

To maintain the original markup and ensure that the opacity doesn't affect any other elements, I recommend using a pseudo element like this.

Instead of relying on a script for the animation, consider adding an additional step in the animation sequence. This step instructs the element to keep its opacity at 1 until it reaches 60% of the total animation time, after which it should start to fade out.

.outerdiv {
  position: relative;
  height: 500px;
  width: 500px;
  color: white;
  background: url(https://i.sstatic.net/MxR09.png);
}
.outerdiv::before {
  content: '';
  background-color: black;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  opacity: 0.5;
  animation: fade 2s linear;
}
.innerdiv {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}
p {
  position: relative;
}

@keyframes fade {
  0%   { opacity:1 }
  60%  { opacity:1 }
  100% { opacity:0.5 }
}

<div class="outerdiv">
  <div class="innerdiv">
  </div>
  <p>
    The text inside should remain solid white
  </p>
</div>

Answer 4

To maintain the original markup and ensure that the opacity doesn't affect any other elements, I recommend using a pseudo element like this.

Instead of relying on a script for the animation, consider adding an additional step in the animation sequence. This step instructs the element to keep its opacity at 1 until it reaches 60% of the total animation time, after which it should start to fade out.

.outerdiv {
  position: relative;
  height: 500px;
  width: 500px;
  color: white;
  background: url(https://i.sstatic.net/MxR09.png);
}
.outerdiv::before {
  content: '';
  background-color: black;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  opacity: 0.5;
  animation: fade 2s linear;
}
.innerdiv {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}
p {
  position: relative;
}

@keyframes fade {
  0%   { opacity:1 }
  60%  { opacity:1 }
  100% { opacity:0.5 }
}

<div class="outerdiv">
  <div class="innerdiv">
  </div>
  <p>
    The text inside should remain solid white
  </p>
</div>

Answer 5

Answer №3

There are numerous ways to achieve this effect. Here, we present four simple examples that work seamlessly.

Utilizing CSS Transitions

HTML:

<div class="container">
  <div class="outerdiv">
  </div>
  <div class="innerdiv">
  </div>
  <p>
    content - should remain solid white
  </p>
</div>

CSS:

.container,.outerdiv {
  background-color: black;
  position: relative;
  display: block;
  height: 500px;
  width: 500px;
  color: white;
}

.outerdiv,.innerdiv {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

.outerdiv{
  z-index:1;
  transition: .5s opacity linear;
}

.innerdiv{
  background-image: url(https://i.sstatic.net/MxR09.png);
}

.outerdiv.fadeout{
  opacity:0
}

.container p{
  position:relative;
  z-index:3;
}

JS:

// wait 1 second, add the fadeout class, let the CSS do the rest
setTimeout(function(){
  document.querySelector('.outerdiv').classList.add('fadeout')
},1000);

View it live: https://jsfiddle.net/kmm8e0x7/8/

Applying CSS Animation

HTML: same as above

CSS:

.container,.outerdiv {
  background-color: black;
  position: relative;
  display: block;
  height: 500px;
  width: 500px;
  color: white;
}

.outerdiv,.innerdiv {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

.outerdiv{
  z-index:1;
}

.innerdiv{
  background-image: url(https://i.sstatic.net/MxR09.png);
}

.outerdiv{
  animation: fadeout .5s linear forwards 1s;      
  /* 
    Which is shorthand for:
      animation-name: fadeout 
      animation-duration: .5s;
      animation-timing-function: linear
      animation-fill-mode:forwards;
      animation-delay: 1s 
  */
}

.container p{
  position:relative;
  z-index:3;
}

@keyframes fadeout{
  from{opacity:1}
  to{opacity:0}
}

JS: none (animation-delay property eliminates the need for setTimeout)

See it in action: https://jsfiddle.net/kmm8e0x7/7/

Using JavaScript Approach

HTML: similar to above

CSS:

.container,.outerdiv {
  background-color: black;
  position: relative;
  display: block;
  height: 500px;
  width: 500px;
  color: white;
}

.outerdiv,.innerdiv {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

.outerdiv{
  z-index:1;
  transition: .5s opacity linear;
}

.innerdiv{
  background-image: url(https://i.sstatic.net/MxR09.png);
}

.container p{
  position:relative;
  z-index:3;
}

JS:

var el = document.querySelector('.outerdiv');

function fadeout(){
  el.style.opacity -= 0.01;
  
  if(el.style.opacity !== 0){
      requestAnimationframe(fadeout);
      // this could just as easily be setTimeout(fadeout,t) where t = an increment of time after which to call the next frame
  }
}

// just use setTimeout to wait for 1 second before starting the fadeout
setTimeout(fadeout,1000);

See it in motion: https://jsfiddle.net/kmm8e0x7/6/

Implementing jQuery

HTML: same as above

CSS: same as above

JS:

$('.outerdiv').animate({
  'opacity': '0'
}, 500);

Witness it live: https://jsfiddle.net/kmm8e0x7/5/

Answer 6

There are numerous ways to achieve this effect. Here, we present four simple examples that work seamlessly.

Utilizing CSS Transitions

HTML:

<div class="container">
  <div class="outerdiv">
  </div>
  <div class="innerdiv">
  </div>
  <p>
    content - should remain solid white
  </p>
</div>

CSS:

.container,.outerdiv {
  background-color: black;
  position: relative;
  display: block;
  height: 500px;
  width: 500px;
  color: white;
}

.outerdiv,.innerdiv {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

.outerdiv{
  z-index:1;
  transition: .5s opacity linear;
}

.innerdiv{
  background-image: url(https://i.sstatic.net/MxR09.png);
}

.outerdiv.fadeout{
  opacity:0
}

.container p{
  position:relative;
  z-index:3;
}

JS:

// wait 1 second, add the fadeout class, let the CSS do the rest
setTimeout(function(){
  document.querySelector('.outerdiv').classList.add('fadeout')
},1000);

View it live: https://jsfiddle.net/kmm8e0x7/8/

Applying CSS Animation

HTML: same as above

CSS:

.container,.outerdiv {
  background-color: black;
  position: relative;
  display: block;
  height: 500px;
  width: 500px;
  color: white;
}

.outerdiv,.innerdiv {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

.outerdiv{
  z-index:1;
}

.innerdiv{
  background-image: url(https://i.sstatic.net/MxR09.png);
}

.outerdiv{
  animation: fadeout .5s linear forwards 1s;      
  /* 
    Which is shorthand for:
      animation-name: fadeout 
      animation-duration: .5s;
      animation-timing-function: linear
      animation-fill-mode:forwards;
      animation-delay: 1s 
  */
}

.container p{
  position:relative;
  z-index:3;
}

@keyframes fadeout{
  from{opacity:1}
  to{opacity:0}
}

JS: none (animation-delay property eliminates the need for setTimeout)

See it in action: https://jsfiddle.net/kmm8e0x7/7/

Using JavaScript Approach

HTML: similar to above

CSS:

.container,.outerdiv {
  background-color: black;
  position: relative;
  display: block;
  height: 500px;
  width: 500px;
  color: white;
}

.outerdiv,.innerdiv {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

.outerdiv{
  z-index:1;
  transition: .5s opacity linear;
}

.innerdiv{
  background-image: url(https://i.sstatic.net/MxR09.png);
}

.container p{
  position:relative;
  z-index:3;
}

JS:

var el = document.querySelector('.outerdiv');

function fadeout(){
  el.style.opacity -= 0.01;
  
  if(el.style.opacity !== 0){
      requestAnimationframe(fadeout);
      // this could just as easily be setTimeout(fadeout,t) where t = an increment of time after which to call the next frame
  }
}

// just use setTimeout to wait for 1 second before starting the fadeout
setTimeout(fadeout,1000);

See it in motion: https://jsfiddle.net/kmm8e0x7/6/

Implementing jQuery

HTML: same as above

CSS: same as above

JS:

$('.outerdiv').animate({
  'opacity': '0'
}, 500);

Witness it live: https://jsfiddle.net/kmm8e0x7/5/

Effortlessly create a seamless transition in background color opacity once the base image has finished

Answer №1

Answer №2

Answer №3

Utilizing CSS Transitions

Applying CSS Animation

Using JavaScript Approach

Implementing jQuery

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