I just improved on laaposto's answer to include a callback.
I also added a fade_out
function.
It could be made more efficient, but it works great for what i'm doing.
Look at laaposto's answer for implementation instructions.
You can replace the JS in his fiddle with mine and see the example.
Thanks laaposto!
This really helped out for my project that requires zero dependencies.
let el = document.getElementById( "div1" );
function fade_in( element, duration, callback = '' ) {
element.style.opacity = 0;
let last = +new Date();
let tick = function() {
element.style.opacity = +element.style.opacity + ( new Date() - last ) / duration;
last = +new Date();
if ( +element.style.opacity < 1 )
( window.requestAnimationFrame && requestAnimationFrame( tick ) ) || setTimeout( tick, 16 );
else if ( callback !== '' )
callback();
};
tick();
}
function fade_out( element, duration, callback = '' ) {
element.style.opacity = 1;
let last = +new Date();
let tick = function() {
element.style.opacity = +element.style.opacity - ( new Date() - last ) / duration;
last = +new Date();
if ( +element.style.opacity > 0 )
( window.requestAnimationFrame && requestAnimationFrame( tick ) ) || setTimeout( tick, 16 );
else if ( callback !== '' )
callback();
};
tick();
}
fade_out( el, 3000, function(){ fade_in( el, 3000 ) } );
Cheers!