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Material Design like form input text fields

A Pen By Tero Auralinna Pro

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HTML

            
              <h1><a href="https://material.io/design/components/text-fields.html">Material Design</a> like form input text fields</h1>

<div class="container">
  <form>
    <div class="form-field">
      <div class="form-field__control">
        <label for="firstname" class="form-field__label">First name</label>
        <input id="firstname" class="form-field__input" />
      </div>
    </div>
    <div class="form-field">
      <div class="form-field__control">
        <label for="lastname" class="form-field__label">Last name</label>
        <input id="lastname" class="form-field__input" />
      </div>
    </div>
    <div class="form-field">
      <div class="form-field__control">
        <label for="additionalInfo" class="form-field__label">Additional info</label>
        <textarea id="additionalInfo" class="form-field__textarea"></textarea>
      </div>
    </div>
  </form>
</div>
!

CSS

            
              html, body {
  color: #333;
  font-size: 16px;
  line-height: 20px;
}
body {
  margin: 20px;
}

h1 {
  line-height: 1.2;
  margin-bottom: 35px;
  text-align: center;
}

.container {
  margin: 0 auto 35px;
  max-width: 400px;
}

/* Actual code example */

$primary-color: #b11adc;
$animation-duration: 0.4s;

.form-field {
  display: block;
  margin-bottom: 16px;
  
  &--is-active {
    .form-field__control {
      &:after {
        border-bottom: 2px solid $primary-color;
        transform: scaleX(150);
      }
    }
    .form-field__label {
      color: #b11adc;
      font-size: 0.75rem;
      transform: translateY(-14px);
    }
  }
}
.form-field__label {
  top: 0;
  display: block;
  font-size: 1.2rem;
  font-weight: normal;
  left: 0;
  margin: 0;
  padding: 18px 12px 0 ;
  position: absolute;
  transition: all $animation-duration;
  width: 100%;
}
.form-field__control {
  background: #eee;
  border-radius: 8px 8px 0 0;
  overflow: hidden;
  position: relative;
  width: 100%;
  
  &:after {
    border-bottom: 2px solid $primary-color;
    bottom: 0;
    content: "";
    display: block;
    left: 0;
    margin: 0 auto;
    position: absolute;
    right: 0;
    transform: scaleX(0);
    transition: all $animation-duration;
    width: 1%;
  }
}
.form-field__input,
.form-field__textarea {
  appearance: none;
  background: transparent;
  border: 0;
  border-bottom: 1px solid #999;
  color: #333;
  display: block;
  font-size: 1.2rem;
  margin-top: 24px;
  outline: 0;
  padding: 0 12px 10px 12px;
  width: 100%;
}
.form-field__textarea {
  height: 150px;
}
!

JS

            
              const setActive = (el, active) => {
  if (active) {
    el.parentNode.parentNode.className = 'form-field form-field--is-active'
  } else {
    if (el.value === '') {
      el.parentNode.parentNode.className = 'form-field'
    }
  }
}

Array.prototype.forEach.call(
  document.querySelectorAll('.form-field__input, .form-field__textarea'),
  (el) => {
    el.onblur = () => {
      setActive(el, false)
    }
    el.onfocus = () => {
      setActive(el, true)
    }
  }
)
!
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