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HTML

              
                <!-- Optimized for Chrome, Safari and Firefox. Sorry IE -->
<div id="app"></div>
              
            
!

CSS

              
                $_padding-horizontal: 14px;
$_padding-horizontal__icon: 8px;
$_padding-vertical: 16px;
$_floating-label__padding-horizontal: 4px;
$_margin-vertical: 16px;
$_transition-timing-function: cubic-bezier(0.25, 0.8, 0.25, 1);
$_transition-duration: 0.4s;
$_border-width: 1px;
$_border-width__active: 2px;
$_icon-size: 24px;
$_icon-margin: 12px;

.outline-input {
  --border-radius: 4px;
  --color: rgba(0, 0, 0, 0.87);
  --color__secondary: rgba(0, 0, 0, 0.54);
  --color__disabled: rgba(0, 0, 0, 0.38);
  --color__inactive: rgba(0, 0, 0, 0.24);
  --color__border: var(--color__secondary);
  --color__focused: rgb(98, 0, 234);
  --color__error: rgb(213, 0, 0);
  --font-size: 16;
  --label-font-size__active: 12;
  --label-scale-factor: calc(var(--label-font-size__active) / var(--font-size));
  --label-scale-width: calc(
    (
        100% - #{$_padding-horizontal * 2} - #{$_floating-label__padding-horizontal}
      ) / var(--label-scale-factor)
  );
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  margin: $_margin-vertical 0;

  .field-wrapper {
    align-items: center;
    display: flex;
    flex-direction: row;
    position: relative;

    input,
    label {
      font-size: calc(var(--font-size) * 1px);
    }

    input {
      background: transparent;
      border: none;
      color: var(--color);
      padding: $_padding-vertical $_padding-horizontal;
      outline: none;
      width: 100%;

      &:-moz-ui-invalid {
        box-shadow: none !important;
      }
    }

    i {
      color: var(--color);
      margin: 0 $_icon-margin;
      pointer-events: none;
      width: $_icon-size;
    }

    label {
      color: var(--color__secondary);
      pointer-events: none;

      &.floating {
        left: $_padding-horizontal;
        line-height: calc((var(--label-font-size__active) * 1px) * 1.45);
        max-width: calc(100% - #{$_padding-horizontal * 2});
        overflow: hidden;
        position: absolute;
        text-overflow: ellipsis;
        transition-duration: $_transition-duration;
        transform-origin: 0 0;
        transition-property: color, font-size, padding, transform, max-width,
          left;
        transition-timing-function: $_transition-timing-function;
        white-space: nowrap;
      }

      &.reference {
        max-width: var(--label-scale-width);
        padding: 0 $_floating-label__padding-horizontal 0 0;
        transform: scale3d(
          var(--label-scale-factor),
          var(--label-scale-factor),
          1
        );
      }
    }

    &._leading-icon,
    &._trailing-icon {
      label {
        &.floating:not(.reference) {
          max-width: calc(
            100% - #{$_icon-size + ($_icon-margin * 2) + $_padding-horizontal}
          );
        }
      }
    }

    &._leading-icon._trailing-icon {
      label {
        &.floating:not(.reference) {
          max-width: calc(100% - #{(($_icon-size + ($_icon-margin * 2)) * 2)});
        }
      }
    }

    &._leading-icon {
      input {
        padding-left: 0;
      }

      label {
        &.floating:not(.reference) {
          left: $_icon-size + ($_icon-margin * 2);
        }
      }
    }

    &._trailing-icon {
      input {
        padding-right: 0;
      }
    }

    .borders {
      display: flex;
      flex-direction: row;
      height: 100%;
      pointer-events: none;
      position: absolute;
      width: 100%;

      .border {
        border-color: var(--color__border);
        border-style: solid;
        transition-duration: $_transition-duration;
        transition-property: border-color, width;
        transition-timing-function: $_transition-timing-function;
      }

      .middle {
        display: flex;
        flex: 1 1 auto;
        flex-direction: column;

        .top-borders {
          display: flex;
          flex-direction: row;
          justify-content: space-between;

          .border {
            border-width: $_border-width 0 0;
            flex: unset;

            &.start {
              // --label-active-width set within js
              width: calc(var(--label-active-width) / 2);
            }
          }
        }

        .border {
          flex: 1 1 auto;
          width: 100%;

          &.bottom {
            border-width: 0 0 $_border-width 0;
          }
        }
      }

      .right,
      .left {
        width: $_padding-horizontal - $_floating-label__padding-horizontal -
          $_border-width;
      }

      .left {
        border-radius: var(--border-radius) 0 0 var(--border-radius);
        border-width: $_border-width 0 $_border-width $_border-width;
      }

      .right {
        border-radius: 0 var(--border-radius) var(--border-radius) 0;
        border-width: $_border-width $_border-width $_border-width 0;
      }
    }

    &._floating-label {
      &._focused,
      &._has-value {
        .borders {
          .top-borders {
            .start {
              width: 0;
            }

            .end {
              width: calc(
                100% - var(--label-active-width, 0) - #{$_floating-label__padding-horizontal}
              );
            }
          }
        }
        label {
          &.floating {
            &:not(.reference) {
              left: $_padding-horizontal;
              max-width: var(--label-scale-width);
              padding: 0 $_floating-label__padding-horizontal 0 0;
              transform: translate3d(
                  0,
                  calc(-100% - var(--label-font-size__active) * 0.5px),
                  0
                )
                scale3d(var(--label-scale-factor), var(--label-scale-factor), 1);
            }
          }
        }
      }
    }

    &._focused {
      label.floating {
        color: var(--color__focused);
      }
      .borders {
        .top-borders {
          .border {
            border-width: $_border-width__active 0 0;
          }
        }

        .border {
          border-color: var(--color__focused);

          &.bottom {
            border-width: 0 0 $_border-width__active 0;
          }

          &.left {
            border-width: $_border-width__active 0 $_border-width__active
              $_border-width__active;
          }

          &.right {
            border-width: $_border-width__active $_border-width__active
              $_border-width__active 0;
          }
        }
      }
    }

    &._invalid {
      .borders {
        .border {
          border-color: var(--color__error);
        }
      }

      label.floating {
        color: var(--color__error);
      }
    }
  }

  .hints {
    color: var(--color__secondary);
    display: flex;
    flex-direction: row;
    font-size: 12px;
    margin: 4px 12px 0 12px;

    .messages {
      flex: 1 1 auto;
    }

    .error {
      color: var(--color__error);
    }

    .char-counter {
      margin: 0 0 0 12px;
    }
  }
}

// Dark mode

.dark {
  .outline-input {
    --color: rgb(255, 255, 255);
    --color__secondary: rgba(255, 255, 255, 0.7);
    --color__disabled: rgba(255, 255, 255, 0.3);
    --color__inactive: rgba(255, 255, 255, 0.24);
    --color__border: var(--color__disabled);
    --color__focused: rgb(179, 136, 255);
    --color__error: rgb(255, 82, 82);

    i {
      &.material-icons-two-tone {
        filter: invert(1);
      }
    }

    label {
      &.floating {
        color: var(--color__disabled);
      }
    }
  }
}

// Demo

html,
body {
  margin: 0 0;
  padding: 0 0;
}

section {
  display: flex;
  flex-direction: row;

  > div {
    flex: 1 1 50%;
    justify-content: center;
    padding: 0 32px;
  }

  &:first-child > div {
    padding-top: 16px;
  }

  &:last-child > div {
    padding-bottom: 16px;
  }
}

.dark {
  background-color: #212121;
}

.outline-input {
  max-width: 400px;
}

              
            
!

JS

              
                class OutlineInput extends React.Component {
  static defaultProps = {
    type: 'text',
  };
  
  constructor(props) {
    super(props);
    this.focusField = this.focusField.bind(this);
    this.onFocus = this.onFocus.bind(this);
    this.onBlur = this.onBlur.bind(this);
    this.updateValue = this.updateValue.bind(this);
    this.getStyleClasses = this.getStyleClasses.bind(this);
    this.placeholderLabel = this.placeholderLabel.bind(this);
    this.showHintContainer = this.showHintContainer.bind(this);
    this.setLabelWidthStyleProperty = this.setLabelWidthStyleProperty.bind(this);
    this.setError = this.setError.bind(this);
    this.state = {
      focused: false,
      value: this.props ? this.props.value : null,
      errorMessage: this.props ? this.props.errorMessage : null,
    };
    this.container = React.createRef();
    this.floatingLabel = React.createRef();
    this.inputField = React.createRef();
    window.addEventListener('resize', this.setLabelWidthStyleProperty);
  }

  componentDidMount() {
    this.setLabelWidthStyleProperty();
    this.updateValidity();
  }

  componentWillUnmount() {
    window.removeEventListener('resize', this.setLabelWidthStyleProperty);
  }

  focusField() {
    if (!this.inputField.current) {
      return;
    }
    this.inputField.current.focus();
  }

  onFocus() {
    this.setState({
      focused: true,
    });
    this.setLabelWidthStyleProperty();
  }

  onBlur() {
    this.setState({
      focused: false,
    });
  }

  setLabelWidthStyleProperty() {
    if (this.floatingLabel.current) {
      let dims = this.floatingLabel.current.getBoundingClientRect();
      this.container.current.style.setProperty('--label-active-width', `${dims.width}px`);
    } else {
      this.container.current.style.setProperty('--label-active-width', 0);
    }
  }

  placeholderLabel() {
    if (this.props.floatingLabel) {
        return this.state.focused ? this.props.placeholder : null;
    }
    return this.props.placeholder;
  }

  updateValue(e) {
    this.setState({
      value: e.target.value,
    }, () => this.updateValidity());
  }

  updateValidity() {
    if (!this.inputField.current) {
        return;
    }
    this.setState({
      valid: this.inputField.current.checkValidity(),
    });
  }

  getStyleClasses() {
    let classes = [];
    if (this.props.floatingLabel) {
      classes.push('_floating-label');
    }
    if (this.props.leadingIcon) {
      classes.push('_leading-icon');
    }
    if (this.props.trailingIcon) {
      classes.push('_trailing-icon');
    }
    if (!this.state.valid) {
      classes.push('_invalid');
    }
    if (this.state.value) {
      classes.push('_has-value');
    }
    if (this.state.focused) {
      classes.push('_focused');
    }
    return classes.join(' ');
  }

  showHintContainer() {
    return this.state.errorMessage || this.props.helperText || this.props.charCounter;
  }

  setError(errorMessage) {
    if (!this.inputField.current) {
      return;
    }
    this.inputField.current.setCustomValidity(errorMessage);
    this.setState({
      valid: false,
      errorMessage,
    });
  }
  
  render() {
    return (<div className="outline-input" ref={this.container}>
        <div className={`field-wrapper ${this.getStyleClasses()}`} onClick={this.focusField}>
          {this.props.floatingLabel ? <label className="floating">{this.props.floatingLabel}</label> : null}
          {this.props.floatingLabel ? <label ref={this.floatingLabel} className="floating reference" style={{ opacity: 0, pointerEvents: 'none', visibility: 'hidden', zIndex: -9999999999 }}>{this.props.floatingLabel}</label> : null}
          {this.props.leadingIcon ? <MaterialIcon className='leading' type="outlined" name={this.props.leadingIcon} /> : null}
          <input
            ref={this.inputField}
            type={this.props.type}
            minLength={this.props.minLength}
            maxLength={this.props.maxLength}
            min={this.props.min}
            max={this.props.max}
            placeholder={this.placeholderLabel()}
            value={this.state.value}
            onChange={this.updateValue}
            onFocus={this.onFocus}
            onBlur={this.onBlur} />
          {this.props.trailingIcon ? <MaterialIcon className='leading' type="outlined" name={this.props.trailingIcon} /> : null}
          <div className="borders">
            <div className="border left" />
            <div className="middle">
              <div className="top-borders">
                <div className="border start" />
                <div className="border end" />
              </div>
              <div className="border bottom" />
            </div>
            <div className="border right" />
          </div>
        </div>
        {this.showHintContainer() ? <div className="hints">
          {this.state.errorMessage || this.props.helperText ? <div className="messages">
            {!this.state.valid && this.state.errorMessage ? <div className="error">{this.state.errorMessage}</div> : null}
              {this.state.valid && this.props.helperText ? <div className="helper">{this.props.helperText}</div> : null}
          </div> : null}
          {this.props.maxLength ? <div className="char-counter">{this.state.value ? this.state.value.length : 0}/{this.props.maxLength}</div> : null}
        </div> : null}
      </div>);
  }
}

class MaterialIcon extends React.Component {
 
  constructor(props) {
    super(props);
    this.getType = this.getType.bind(this);
  }
  
  getType() {
    let types = {
      twoTone: 'two-tone',
      outlined: 'outlined',
      round: 'round',
      sharp: 'sharp',
    };
    return types[this.props.type] || '';
  }
  
  render() {
    return (<i className={`material-icons${this.getType() ? `-${this.getType()}` : ''} ${this.props.className}`}>{this.props.name}</i>);
  }
}

// Demo
class Application extends React.Component {
  key = 0;
  demoFields = [
    {
      key: this.key++,
      placeholder: 'Basic input',
    },
    {
      key: this.key++,
      floatingLabel: 'Floating label',
      placeholder: 'Secondary placeholder text',
    },
    {
      key: this.key++,
      floatingLabel: 'Example of a super super super super super super super super super super long label',
      placeholder: 'Write your text here',
    },
    {
      key: this.key++,
      floatingLabel: 'Initial value',
      value: 'This is pretty neato',
    },
    {
      key: this.key++,
      floatingLabel: 'This input has an error',
      invalid: true,
    },
    {
      key: this.key++,
      floatingLabel: 'Help me out bro',
      helperText: 'I will show you da wei',
      maxLength: 50,
    },
    {
      key: this.key++,
      floatingLabel: 'Number input',
      type: 'number',
      max: 100,
      helperText: 'Input will become invalid if value is greater than 100',
      errorMessage: 'Value can\'t be greater than 100',
    },
    {
      key: this.key++,
      placeholder: 'Basic input with leading icon',
      leadingIcon: 'local_pizza',
    },
    {
      key: this.key++,
      placeholder: 'Basic input with trailing icon',
      trailingIcon: 'info',
    },
    {
      key: this.key++,
      placeholder: 'Basic input with leading and trailing icons',
      leadingIcon: 'local_pizza',
      trailingIcon: 'info',
    },
    {
      key: this.key++,
      floatingLabel: 'Floating label with leading icon',
      leadingIcon: 'cake',
    },
    {
      key: this.key++,
      floatingLabel: 'Floating label with trailing icon',
      trailingIcon: 'visibility',
    },
    {
      key: this.key++,
      floatingLabel: 'Floating label with leading and trailing icons',
      leadingIcon: 'cake',
      trailingIcon: 'visibility',
    },
  ];
  invalidRefs = [];

  componentDidMount() {
    this.invalidRefs.forEach(ref => {
      ref.setError('You dun fuked up');
    });
  }

  render() {
    let demoFields = this.demoFields.map(field => (
      <OutlineInput {...field} ref={outlineInput => { field.invalid ? this.invalidRefs.push(outlineInput) : null }} />
    ));
    return (
      <React.Fragment>
        {demoFields.map(DemoField => (
          <section>
            <div>{DemoField}</div>
            <div className='dark'>{DemoField}</div>
          </section>
        ))}
      </React.Fragment>
    );
  }
}

ReactDOM.render(
  <Application />,
  document.getElementById('app'),
);
              
            
!
999px

Console