Input control floating placeholder stays on validation - html

Question

I am trying to achieve a floating placeholder functionality. Everything works fine with the code I have written except for the fact that when there is an email field and I try to add a wrong entry which is not of an email format and i shift focus from the input box, the floating text still appears. You can check the codepen link
Belew is my code:-
.-input-container {
max-width: 540px;
padding-bottom: 30px;
margin-top: 30px;
}
input.-textbox {
width: 100%;
border-radius: 40px;
background-color: #f5f5f5;
border: 1px solid #dddddd;
padding: 16px 30px;
font-size: 16px;
color: #555555;
font-family: OpenSans;
font-weight: normal;
font-style: normal;
font-stretch: normal;
line-height: 1.88;
letter-spacing: normal;
text-align: left;
}
input.-textbox:focus{
outline: none;
box-shadow: none
}
input.-textbox:focus ~ .floating-label,
input.-textbox:not(:focus):valid ~ .floating-label {
top: 8px;
bottom: 10px;
left: 45px;
font-size: 10px;
opacity: 1;
line-height: 2.1;
font-family: OpenSans;
}
input.-textbox ~ .floating-label {
position: absolute;
pointer-events: none;
left: 45px;
top: 18px;
transition: 0.2s ease all;
}
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.0/css/bootstrap.css" rel="stylesheet"/>
<div class="-input-container col-xl-6 col-lg-6 col-md-12 col-sm-12 col-12 ">
<input type="email" class="-textbox form-control" required="">
<span class="floating-label">E-postadress</span>
</div>

Answer 1

Try this:
.-input-container {
max-width: 540px;
padding-bottom: 30px;
margin-top: 30px;
}
input.-textbox {
width: 100%;
border-radius: 40px;
background-color: #f5f5f5;
border: 1px solid #dddddd;
padding: 16px 30px;
font-size: 16px;
color: #555555;
font-family: OpenSans;
font-weight: normal;
font-style: normal;
font-stretch: normal;
line-height: 1.88;
letter-spacing: normal;
text-align: left;
&:focus{
outline: none;
box-shadow: none
}
}
<div class="-input-container col-xl-6 col-lg-6 col-md-12 col-sm-12 col-12 ">
<input type="email" class="-textbox form-control" placeholder="E-postadress" required="">
</div>

Answer 2

Use javascript in it. Try this
$('input').on('focusin', function() {
$(this).parent().find('span').addClass('test2');
});
$('input').on('focusout', function() {
if (!this.value) {
$(this).parent().find('span').removeClass('test2');
}
});
.-input-container {
max-width: 540px;
padding-bottom: 30px;
margin-top: 30px;
}
input.-textbox {
width: 100%;
border-radius: 40px;
background-color: #f5f5f5;
border: 1px solid #dddddd;
padding: 16px 30px;
font-size: 16px;
color: #555555;
font-family: OpenSans;
font-weight: normal;
font-style: normal;
font-stretch: normal;
line-height: 1.88;
letter-spacing: normal;
text-align: left;
}
input.-textbox:focus {
outline: none;
box-shadow: none
}
input.-textbox:focus~.floating-label,
input.-textbox:not(:focus):valid~.floating-label, {
top: 18px;
bottom: 10px;
left: 45px;
font-size: 10px;
opacity: 1;
line-height: 2.1;
font-family: OpenSans;
}
input.-textbox~.floating-label {
position: absolute;
pointer-events: none;
left: 45px;
top: 18px;
transition: 0.2s ease all;
}
.test2{
margin-top:-20px;
line-height:2.1;
font-size:10px;
font-family: OpenSans;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.0/css/bootstrap.css" rel="stylesheet" />
<div class="-input-container col-xl-6 col-lg-6 col-md-12 col-sm-12 col-12 ">
<input type="email" class="-textbox form-control" required="" id=spa>
<span class="floating-label">E-postadress</span>
</div>

Answer 3

It is simple with some Javascript and minor changes in styles. Try this one.
$(document).ready(function () {
$('.-textbox').click(function (){
$(this).siblings('span').addClass('active');
});
$('.-textbox').blur(function(){
if($('.-textbox').val()=== ''){
$(this).siblings('span').removeClass('active');
}
});
});
.-input-container {
max-width: 540px;
padding-bottom: 30px;
margin-top: 30px;
position: relative;
}
input.-textbox {
width: 100%;
border-radius: 40px;
background-color: #f5f5f5;
border: 1px solid #dddddd;
padding: 16px 30px;
font-size: 16px;
color: #555555;
font-family: OpenSans;
font-weight: normal;
font-style: normal;
font-stretch: normal;
line-height: 1.88;
letter-spacing: normal;
text-align: left;
&:focus{
outline: none;
box-shadow: none
}
}
input.-textbox ~ .floating-label {
position: absolute;
pointer-events: none;
left: 45px;
top: 18px;
transition: 0.2s ease all;
}
input.-textbox ~ .floating-label.active{
top: 8px;
bottom: 10px;
left: 45px;
font-size: 10px;
opacity: 1;
line-height: 2.1;
font-family: OpenSans;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="-input-container col-xl-6 col-lg-6 col-md-12 col-sm-12 col-12 ">
<input type="email" class="-textbox form-control" required="">
<span class="floating-label">E-postadress</span>
</div>