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simple focus-within polyfill
(function(window, document){
'use strict';
var slice = [].slice;
var removeClass = function(elem){
elem.classList.remove('focus-within');
};
var update = (function(){
var running, last;
var action = function(){
var element = document.activeElement;
running = false;
if(last !== element){
last = element;
slice.call(document.getElementsByClassName('focus-within')).forEach(removeClass);
while(element && element.classList){
element.classList.add('focus-within');
element = element.parentNode;
}
}
};
return function(){
if(!running){
requestAnimationFrame(action);
running = true;
}
};
})();
document.addEventListener('focus', update, true);
document.addEventListener('blur', update, true);
update();
})(window, document);
@nikiedev

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commented Aug 26, 2018

Does it work in Edge and IE ? Please, make an example of use for menu with such a structure:

Or all I need is just to include this file to the html ?
@dudewad

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commented Oct 1, 2018

Did you test this? Focus events don't bubble, are you sure this will work?

@shendrick

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commented Oct 24, 2018

Did you test this? Focus events don't bubble, are you sure this will work?

The true in as the third argument means that it listens for it in the capture phase. https://javascript.info/bubbling-and-capturing

@hamsterbacke23

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commented Jan 22, 2019

would it be possible to make a repo with a license out of this?

@Achmed4

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commented Apr 8, 2019

I tried it and It works fine in all browsers. Thanks a lot :)

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