Add some animation to elements when the page loads

I am curious about triggering a css animation when the page loads. I am currently experimenting with css animations for the first time.

Here is what I have created so far: https://jsfiddle.net/7prg793g. However, it only works upon hover at the moment.

* {
  margin: 0;
  padding: 0;
}

.reveal {
  width: 380px;
  height: 660px;
  margin: 50px;
  float: left;
}

.open {
  background: url(http://uploadir.com/u/9btuxs9t) 0px 330px, url(http://uploadir.com/u/9btuxs9t) 0px -405px, #42413C;
  background-repeat: no-repeat;
  -webkit-transition: background-position 0.3s ease;
  -moz-transition: background-position 0.3s ease;
  -o-transition: background-position 0.3s ease;
  -ms-transition: background-position 0.3s ease;
  transition: background-position 0.3s ease;
}

.open:hover {
  background: url(http://uploadir.com/u/9btuxs9t) 0px 660px, url(http://uploadir.com/u/9btuxs9t) 0px -735px, #42413C;
  background-repeat: no-repeat;
}

.reveal p {
  font: 45px/300px Helvetica, Arial, sans-serif;
  text-align: center;
  -ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=0)";
  filter: alpha(opacity=0);
  opacity: 0;

  -webkit-transition: all 0.3s ease;
  -moz-transition: all 0.3s ease;
  -o-transition: all 0.3s ease;
  -ms-transition: all 0.3s ease;
  transition: all 0.3s ease;
}

.reveal:hover p {
  -ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
  filter: alpha(opacity=100);
  opacity: 1;
  cursor: pointer;
}

If it's possible to trigger the animation on page load, my next question would be whether it's possible to delay the animation until the div is actually visible. I plan to use a preloader beforehand.

Thank you.

htmlcss

Answer №1

CSS Animation with Keyframes

Utilizing keyframes for CSS animation can provide a visually appealing effect, but its compatibility across different browsers may vary:

@keyframes opening {
    0% {
          background: url(http://uploadir.com/u/9btuxs9t) 0px 330px, url(http://uploadir.com/u/9btuxs9t) 0px -405px, #42413C;
    }
    100% {
       background: url(http://uploadir.com/u/9btuxs9t) 0px 660px, url(http://uploadir.com/u/9btuxs9t) 0px -735px, #42413C;
    }
}

@keyframes opening-p {
    0% {
      -ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=0)";
      filter: alpha(opacity=0);
      opacity: 0;    
    }
    100% {
      -ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=100";
      filter: alpha(opacity=100);
      opacity: 1;
    }
}

The keyframes are defined to animate the div and text accordingly, then attached using the css property (animation-fill-mode:forwards;)

.open {
    background: url(http://uploadir.com/u/9btuxs9t) 0px 330px, url(http://uploadir.com/u/9btuxs9t) 0px -405px, #42413C;
  background:no-repeat;
  -webkit-transition: background-position 0.3s ease;
  -moz-transition: background-position 0.3s ease;
  -o-transition: background-position 0.3s ease;
  -ms-transition: background-position 0.3s ease;
  transition: background-position 0.3s ease;
  animation-name: opening;
  animation-iteration-count: 1;
  animation-duration: 1s;
  animation-fill-mode: forwards;
}

.reveal p {
  font: 45px/300px Helvetica, Arial, sans-serif;
  text-align: center;
  cursor:pointer;

  -webkit-transition: all 0.3s ease;
  -moz-transition: all 0.3s ease;
  -o-transition: all 0.3s ease;
  -ms-transition: all 0.3s ease;
  transition: all 0.3s ease;

  animation-name: opening-p;
  animation-iteration-count: 1;
  animation-duration: 1s;
  animation-fill-mode: forwards;
}

Link to view the animation in action: http://jsfiddle.net/8anvmpfv/

jQuery Alternative

Alternatively, achieving the same animation effect using jQuery is simple:

  $('.reveal').ready(function() {
      $('.reveal').addClass('opened revealed');
  });

This script waits for the div to be ready before adding the necessary classes via jQuery to trigger the CSS animation. Link to view the alternative method: https://jsfiddle.net/k6faf0fu/

Answer №2

One possible solution could involve utilizing pure CSS, with animation delays and some mathematical calculations to coordinate everything. However, incorporating JavaScript into the mix might be your best option.

If you're interested, check out this fiddle showcasing a very basic (albeit not-so-pretty) loading animation screen.

The process typically involves initially 'locking' the body of the page and overlaying it to prevent user interactions. Subsequently, you would monitor the transitionend events of different elements to determine when to trigger additional transitions. Alternatively, CSS animations can also be employed by using animationend instead.

Answer №3

Using JavaScript to apply a CSS animation when the page loads: 

$(document).ready(function() {
    $("yourHtmlTag").addClass("open:hover");
});

To add animations based on visibility, check out the jQuery API documentation.

Answer №4

Placing it at the end of your webpage ensures that this action will occur once all other elements have finished loading, except for images.

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