En el siguiente código se quitan los estilos por defectos de un checkbox y se realiza una animación, como si el check se realizase a mano.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Check box personalizado</title>
<style>
.contenedor {
position: relative;
}
.check {
appearance: none;
width: 14px;
height: 14px;
border: 1px solid #500;
vertical-align: bottom;
}
.linea {
width: 14px;
height: 14px;
fill: none;
stroke: #500;
position: absolute;
left: 5px;
top: 3px;
z-index: -1;
}
label {
font-family: Arial, Helvetica, sans-serif;
color: #500;
}
.animado {
transition: stroke-dashoffset .5s;
}
</style>
</head>
<body>
<div class="contenedor">
<input type="checkbox" id="check" class="check" >
<label for="check">Aceptar condiciones</label>
<svg class="linea" xmlns="http://www.w3.org/2000/svg">
<path class="trazo" d="M2 6.5C2 6.5 5 14.5 6.5 12.5C8 10.5 9.5 2 9.5 2" stroke-width="3" stroke-linecap="round">
</path>
</svg>
</div>
<script>
var check = document.querySelector("#check");
var trazo = document.querySelector(".trazo");
var length = trazo.getTotalLength();
trazo.style.strokeDasharray = length;
trazo.style.strokeDashoffset = length;
check.addEventListener("change", function () {
if (this.checked == true) {
trazo.classList.add("animado");
trazo.style.strokeDashoffset = 0;
} else {
trazo.classList.remove("animado");
trazo.style.strokeDashoffset = length;
}
});
</script>
</body>
</html>
