html - How to move placeholder to top on focus AND while typing?

Question

I want the placeholder to move to the top when the textbox is on focus and also while the user is typing.

I'm not sure if this is just html/css or any javascript too.

My current css looks like this, and I have no js code yet:

input:focus::-webkit-input-placeholder {
    font-size: .75em;
    position: relative;
    top: -15px; 
    transition: 0.2s ease-out;
}

input::-webkit-input-placeholder {
    transition: 0.2s ease-in;
}

input[type="text"]:focus, input[type="password"]:focus {
    height: 50px;
    padding-bottom: 0px;
    transition: 0.2s ease-in;
}

input[type="text"], input[type="password"] {
    height: 50px;
    transition: 0.2s ease-in;
}

It almost does the work but the placeholder disappears when I start typing. I'm using twitter-bootstrap, if that makes anything easier!

Thanks.

Answer 1

You could do it like this

HTML:

<div>
  <input type="text" class="inputText" />
  <span class="floating-label">Your email address</span>
</div>

CSS:

input:focus ~ .floating-label,
input:not(:focus):valid ~ .floating-label{
  top: 8px;
  bottom: 10px;
  left: 20px;
  font-size: 11px;
  opacity: 1;
}

.inputText {
  font-size: 14px;
  width: 200px;
  height: 35px;
}

.floating-label {
  position: absolute;
  pointer-events: none;
  left: 20px;
  top: 18px;
  transition: 0.2s ease all;
}

Working JSFiddle here https://jsfiddle.net/273ntk5s/2/