Validation Shake

Field shakes and turns red on invalid input

How to use it

Paste the HTML where the forms & inputs 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.

<!-- Validation Shake · Bron: Animista · licentie FreeBSD. Laat deze vermelding staan bij hergebruik. -->
<div class="jouw-container">
<form class="vsi-wrap"><input class="vsi-input" type="text" placeholder="Voer minstens 4 tekens in"><button class="vsi-btn" type="submit">Bevestig</button><span class="vsi-msg"></span></form>
</div>

/* Validation Shake · Bron: Animista · licentie FreeBSD. Laat deze vermelding staan bij hergebruik. */
.vsi-wrap{display:flex;flex-direction:column;gap:10px;width:300px;font-family:'Switzer',sans-serif}
.vsi-input{padding:12px 14px;font-size:15px;color:#0a0a0a;background:#fff;border:1px solid rgba(10,10,10,.12);border-radius:10px;outline:none;transition:border-color .2s,box-shadow .2s}
.vsi-input:focus{border-color:#0a0a0a}
.vsi-input.vsi-err{border-color:#e23;box-shadow:0 0 0 3px rgba(238,34,51,.12);animation:vsi-shake .4s}
.vsi-input.vsi-ok{border-color:#1f9d55;box-shadow:0 0 0 3px rgba(31,157,85,.12)}
@keyframes vsi-shake{10%,90%{transform:translateX(-2px)}20%,80%{transform:translateX(4px)}30%,50%,70%{transform:translateX(-7px)}40%,60%{transform:translateX(7px)}}
.vsi-btn{padding:11px;border:none;border-radius:10px;background:#F5480F;color:#fff;font-size:14px;font-weight:600;cursor:pointer;transition:opacity .2s}
.vsi-btn:hover{opacity:.9}
.vsi-msg{font-size:13px;min-height:16px}.vsi-msg.err{color:#e23}.vsi-msg.ok{color:#1f9d55}

// Validation Shake · Bron: Animista · licentie FreeBSD. Laat deze vermelding staan bij hergebruik.
// root = het element waarin de HTML staat
function init(root){
root=root.querySelector('.vsi-wrap')||root;var inp=root.querySelector('.vsi-input'),msg=root.querySelector('.vsi-msg');root.addEventListener('submit',function(e){e.preventDefault();inp.classList.remove('vsi-err','vsi-ok');msg.classList.remove('err','ok');if(inp.value.trim().length<4){void inp.offsetWidth;inp.classList.add('vsi-err');msg.textContent='Minimaal 4 tekens vereist';msg.classList.add('err');}else{inp.classList.add('vsi-ok');msg.textContent='Ziet er goed uit!';msg.classList.add('ok');}});
}
init(document.querySelector('.jouw-container'));

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