Question

Is there a better way of triggering css3 transitions than this, I think this is a little hacky or is this the way everyone is doing this?

Lets say we got a div with the following css:

.box{
  position: fixed;
  top: 50%;
  left: 50%;
  margin: -50px 0px 0px -50px;

  width: 100px;
  opacity: 0;
  transition: opacity .3s ease-out;
}

.box.box-visible{
   opacity: 1;
}

Now we got the following jQuery:

$(function(){
    $('.box').addClass('box-visible');
});

This doesn’t trigger the animation so when we do this:

$(function(){
    var transition = setTimeout(function(){
        $('.box').addClass('box-visible');
    }, 1);
});

Then the transition is triggered, but isn’t this a bit hacky? Is there another solution?

Thanks for reading I hope my answer was clear.

Answer 1

You just have to modify your code a little……

  .box{
            position: fixed;
            top: 50%;
            left: 50%;
            margin: -50px 0px 0px -50px;
            width: 100px;
            border-width:thin;
            border-style:solid;
            background:red;
            opacity: 0;
            -moz-transition: opacity 3s ease-out;//for firefox  
            -o-transition: opacity 3s ease-out;// for opera  
            -webkit-transition: opacity 3s ease-out;// for chrome
        }  
     .box-visible{  
        opacity:1;
      }  

Then in Jquery

     $(document).ready(function(){  
       $(function(){  
           $('.box').addClass('box-visible');  
       });
     });  

Remember: either set the height of the div or put some text within it to notice the change.