Material Floating Labels

by Ayyappan Sakthivadivel

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css">
<div class="form-group">
    <label class="control-label" for="inputNormal">Normal input</label>
    <input type="text" class="form-control" id="inputNormal" />
</div>

<div class="form-group has-warning">
    <label class="control-label" for="inputWarning">Warning input</label>
    <input type="text" class="form-control" id="inputWarning" />
</div>

CSS

body {
    padding: 20px;
}

/* --- material floating label --- */

.form-group {
    display: flex;
    height: 55px;
    border: 0;
}

.control-label {
    font-size: 16px;
    font-weight: 400;
    opacity: 0.4;
    pointer-events: none;
    position: absolute;
    transform: translate3d(0, 22px, 0) scale(1);
    transform-origin: left top;
    transition: 240ms;
}

.form-group.focused .control-label {
    opacity: 1;
    transform: scale(0.75);
}

.form-control {
    align-self: flex-end;
    border: 0;
    border-bottom: #333 solid 1px;
    border-radius:0;
}

.form-control::-webkit-input-placeholder {
    color: transparent;
    transition: 240ms;
}

.form-control:focus::-webkit-input-placeholder {
    transition: none;
    border: 0;
}

.form-group.focused .form-control::-webkit-input-placeholder {
    color: #bbb;
    border: 0;
}

.form-control:focus{
  box-shadow: none;
}

JavaScript

$('.form-control').on('focus blur', function (e) {
    $(this).parents('.form-group').toggleClass('focused', (e.type === 'focus' || this.value.length > 0));
}).trigger('blur');