Like Heart Burst

Heart button with particle burst and counter

How to use it

Paste the HTML where the buttons should appear.
Add the CSS to your stylesheet. All classes are prefixed, so nothing clashes with your own styles.
Add the JavaScript and call init() with the element that contains the HTML.

<!-- Like Heart Burst · NedDev · eigen werk. -->
<div class="jouw-container">
<button class="lhb-btn" aria-pressed="false"><svg class="lhb-heart" viewBox="0 0 24 24" width="26" height="26"><path d="M12 21s-7-4.5-9.5-8.5C.8 9.6 2.3 6 5.5 6 7.4 6 9 7.2 12 10c3-2.8 4.6-4 6.5-4 3.2 0 4.7 3.6 3 6.5C19 16.5 12 21 12 21z"/></svg><span class="lhb-count">128</span></button>
</div>

/* Like Heart Burst · NedDev · eigen werk. */
.lhb-btn{position:relative;display:inline-flex;align-items:center;gap:9px;padding:11px 18px;background:#fff;border:1px solid rgba(10,10,10,.12);border-radius:30px;cursor:pointer;font-family:'Switzer',sans-serif;font-size:15px;font-weight:600;color:#0a0a0a}
.lhb-heart{fill:rgba(10,10,10,.18);transition:transform .25s,fill .25s}
.lhb-btn.lhb-on .lhb-heart{fill:#F5480F;animation:lhb-beat .4s ease}
@keyframes lhb-beat{0%{transform:scale(1)}30%{transform:scale(.7)}60%{transform:scale(1.3)}100%{transform:scale(1)}}
.lhb-spark{position:absolute;left:24px;top:50%;width:6px;height:6px;border-radius:50%;background:#F5480F;pointer-events:none;opacity:0}
.lhb-spark.go{animation:lhb-fly .55s ease-out forwards}
@keyframes lhb-fly{0%{opacity:1;transform:translate(0,0) scale(1)}100%{opacity:0;transform:translate(var(--dx),var(--dy)) scale(.2)}}

// Like Heart Burst · NedDev · eigen werk.
// root = het element waarin de HTML staat
function init(root){
root=root.querySelector('.lhb-btn')||root;var cnt=root.querySelector('.lhb-count'),base=128;root.addEventListener('click',function(){var on=root.classList.toggle('lhb-on');root.setAttribute('aria-pressed',on);cnt.textContent=base+(on?1:0);if(on){for(var i=0;i<8;i++){(function(a){var s=document.createElement('span');s.className='lhb-spark';var ang=a/8*6.28,dist=26+Math.random()*16;s.style.setProperty('--dx',Math.cos(ang)*dist+'px');s.style.setProperty('--dy',Math.sin(ang)*dist+'px');root.appendChild(s);requestAnimationFrame(function(){s.classList.add('go');});setTimeout(function(){s.remove();},600);})(i);}}});
}
init(document.querySelector('.jouw-container'));

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