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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

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About the <head>

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Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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About Packages

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All packages are different, so refer to their docs for how they work.

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HTML 

              
                <div id="root"></div>
<ul>
  <li>Focusable with tab</li>
  <li>Open with space</li>
  <li>Close with tab or escape</li>
  <li>Toggle open/close with enter</li>
  <li>Select using up/down arrows</li>
  <li>Finding option by typing</li>
</ul>
!

CSS 

              
                $grey-background: #f5f5f5;
$grey-border: #ddd;
$grey-text: #898989;
$grey-dark: #444;
$main-light: #d9f2fb;
$main: #00a9e0;
$main-dark: #007da6;
$success: #7fd81e;
$error: #ff5100;
$warning: #f6c223;
$body: #081f2c;

*, *::before, *::after {
  box-sizing: inherit;
}

body {
  box-sizing: border-box;
  margin: 10px;
  color: $body;
  font: 400 13px/20px 'Source Sans Pro', sans-serif;
}  

svg {
  display: block;
  width: 1em;
  height: 1em;
  fill: currentColor;
}

.select {
  position: relative;
  display: inline-block;
  width: 320px;
  
  &:focus {
    outline: 0;
    
    & .selection {
      box-shadow: 0 0 1px 1px $main;
    }
  }
}

.label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
}

.selection {
  position: relative;
  padding: 5px;
  border: 1px solid $grey-border;
  background: #fff;
}

.value {
  position: relative;
  display: inline-block;
  padding: 5px 10px;
}

.multiple {
  padding-right: 30px;
  margin-right: 5px;
  background: $main-light;
  color: $main;
}

.delete {
  position: absolute;
  top: 0;
  right: 0;
  display: block;
  padding: 10px;
  font-size: 10px;
  cursor: pointer;
}

.placeholder {
  padding: 5px 10px;
  color: $grey-text;
}

.arrow {
  position: absolute;
  top: 5px;
  right: 5px;
  display: block;
  padding: 10px;
  font-size: 10px;
  color: $grey-text;
}

.options {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  border: solid $grey-border;
  border-width: 0 1px;
  background: #fff;
}

.option {
  padding: 10px 15px;
  border-bottom: 1px solid $grey-border;
  cursor: pointer;

  &.selected {
    border: 1px solid $main;
    margin: -1px -1px 0;
    background: $main-light;
  }
  
  &.focused {
    background: $grey-background;
  }
}

.checkbox {
  content: '';
  vertical-align: top;
  display: inline-block;
  width: 16px;
  height: 16px;
  padding: 2px;
  border: 1px solid $grey-border;
  border-radius: 2px;
  margin: 2px 12px 0 0;
  color: #fff;
  font-size: 10px;
  
  .selected & {
    border-color: $main-dark;
    background: $main;
  }
}
!

JS 

              
                const { Component, PropTypes } = React
const { string, arrayOf, shape } = PropTypes

class Select extends Component {
  constructor(props) {
    super(props)
    
    this.state = {
      values: [],
      focusedValue: -1,
      isFocused: false,
      isOpen: false,
      typed: ''
    }
    
    this.onFocus = ::this.onFocus
    this.onBlur = ::this.onBlur
    this.onKeyDown = ::this.onKeyDown
    
    this.onClick = ::this.onClick
    this.onDeleteOption = ::this.onDeleteOption
    this.onHoverOption = ::this.onHoverOption
    this.onClickOption = ::this.onClickOption
    
    this.renderOption = ::this.renderOption
  }
  
  onFocus() {
    this.setState({
      isFocused: true
    })
  }
  
  onBlur() {
    const { options, multiple } = this.props
    
    this.setState(prevState => {
      const { values } = prevState
      
      if (multiple) {
        return {
          focusedValue: -1,
          isFocused: false,
          isOpen: false
        }
      } else {
        const value = values[0]
        
        let focusedValue = -1 
        
        if (value) {
          focusedValue = options.findIndex(option => option.value === value)
        }

        return {
          focusedValue,
          isFocused: false,
          isOpen: false
        }
      }
    })
  }
  
  onKeyDown(e) {
    const { options, multiple } = this.props
    const { isOpen } = this.state
    
    switch (e.key) {
      case ' ':
        e.preventDefault()
        if (isOpen) {
          if (multiple) {
            this.setState(prevState => {
              const { focusedValue } = prevState

              if (focusedValue !== -1) {
                const [ ...values ] = prevState.values
                const value = options[focusedValue].value
                const index = values.indexOf(value)

                if (index === -1) {
                  values.push(value)
                } else {
                  values.splice(index, 1)            
                }

                return { values }
              }
            })
          }
        } else {
          this.setState({
            isOpen: true
          })
        }
        break
      case 'Escape':
      case 'Tab':
        if (isOpen) {
          e.preventDefault()
          this.setState({
            isOpen: false
          })
        }
        break
      case 'Enter':
        this.setState(prevState => ({
          isOpen: !prevState.isOpen
        }))
        break
      case 'ArrowDown':
        e.preventDefault()
        this.setState(prevState => {
          let { focusedValue } = prevState
          
          if (focusedValue < options.length - 1) {
            focusedValue++

            if (multiple) {
              return {
                focusedValue
              }
            } else {
              return {
                values: [ options[focusedValue].value ],
                focusedValue
              }
            }
          }
        })
        break
      case 'ArrowUp':
        e.preventDefault()
        this.setState(prevState => {
          let { focusedValue } = prevState
          
          if (focusedValue > 0) {
            focusedValue--

            if (multiple) {
              return {
                focusedValue
              }
            } else {
              return {
                values: [ options[focusedValue].value ],
                focusedValue
              }
            }
          }
        })
        break
      default:
        if (/^[a-z0-9]$/i.test(e.key)) {
          const char = e.key
          
          clearTimeout(this.timeout)
          this.timeout = setTimeout(() => {
            this.setState({
              typed: ''
            })
          }, 1000)
          
          this.setState(prevState => {
            const typed = prevState.typed + char
            const re = new RegExp(`^${typed}`, 'i')
            const index = options.findIndex(option => re.test(option.value))

            if (index === -1) {
              return {
                typed
              }
            }
            
            if (multiple) {
              return {
                focusedValue: index,
                typed
              }
            } else {
              return {
                values: [ options[index].value ],
                focusedValue: index,
                typed
              }
            }
          })
        }
        break
    }
  }

  onClick() {
    this.setState(prevState => ({
      isOpen: !prevState.isOpen
    }))
  }
  
  onDeleteOption(e) {
    const { value } = e.currentTarget.dataset

    this.setState(prevState => {
      const [ ...values ] = prevState.values
      const index = values.indexOf(value)
      
      values.splice(index, 1)

      return { values }
    })
  }
  
  onHoverOption(e) {
    const { options } = this.props
    
    const { value } = e.currentTarget.dataset
    const index = options.findIndex(option => option.value === value)

    this.setState({
      focusedValue: index
    })
  }
  
  onClickOption(e) {
    const { multiple } = this.props
    
    const { value } = e.currentTarget.dataset
    
    this.setState(prevState => {
      if (!multiple) {
        return {
          values: [ value ],
          isOpen: false
        }
      }
      
      const [ ...values ] = prevState.values
      const index = values.indexOf(value)
      
      if (index === -1) {
        values.push(value)
      } else {
        values.splice(index, 1)            
      }
  
      return { values }
    });
  }
  
  stopPropagation(e) {
    e.stopPropagation()
  }
  
  renderValues() {
    const { placeholder, multiple } = this.props
    const { values } = this.state
    
    if (values.length === 0) {
      return (
        <div className="placeholder">
          { placeholder }
        </div>
      )
    }
    
    if (multiple) {
      return values.map(value => {
        return (
          <span
            key={ value }
            onClick={ this.stopPropagation }
            className="multiple value"
          >
            { value }
            <span
              data-value={ value }
              onClick={ this.onDeleteOption }
              className="delete"
            >
              <X />
            </span>
          </span>
        )
      })
    }
    
    return (
      <div className="value">
        { values[0] }
      </div>
    )       
  }
  
  renderOptions() {
    const { options } = this.props
    const { isOpen } = this.state;
    
    if (!isOpen) {
      return null
    }
    
    return (
      <div className="options">
        { options.map(this.renderOption) }
      </div>
    )
  }
  
  renderOption(option, index) {
    const { multiple } = this.props
    const { values, focusedValue } = this.state
    
    const { value } = option
    
    const selected = values.includes(value)
    
    let className = "option"
    if (selected) className += " selected"
    if (index === focusedValue) className += " focused"
    
    return (
      <div
        key={ value }
        data-value={ value }
        className={ className }
        onMouseOver={ this.onHoverOption }
        onClick={ this.onClickOption }
        >
        { multiple ?
          <span className="checkbox">
            { selected ? <Check /> : null }
          </span> :
          null
        }
        { value }
      </div>
    )
  }
  
  render() {
    const { label } = this.props
    const { isOpen } = this.state
    
    return (
      <div
        className="select"
        tabIndex="0"
        onFocus={ this.onFocus }
        onBlur={ this.onBlur }
        onKeyDown={ this.onKeyDown }
      >
        <label className="label">{ label }</label>
        <div className="selection" onClick={ this.onClick }>
          { this.renderValues() }
          <span className="arrow">
            { isOpen ? <ChevronUp /> : <ChevronDown /> }
          </span>
        </div>
        { this.renderOptions() }
      </div>
    )
  }
}

const ChevronDown = () => (
  <svg viewBox="0 0 10 7">
    <path d="M2.08578644,6.5 C1.69526215,6.89052429 1.69526215,7.52368927 2.08578644,7.91421356 C2.47631073,8.30473785 3.10947571,8.30473785 3.5,7.91421356 L8.20710678,3.20710678 L3.5,-1.5 C3.10947571,-1.89052429 2.47631073,-1.89052429 2.08578644,-1.5 C1.69526215,-1.10947571 1.69526215,-0.476310729 2.08578644,-0.0857864376 L5.37867966,3.20710678 L2.08578644,6.5 Z" transform="translate(5.000000, 3.207107) rotate(90.000000) translate(-5.000000, -3.207107) " />
  </svg>
)

const ChevronUp = () => (
  <svg viewBox="0 0 10 8">
    <path d="M2.08578644,7.29289322 C1.69526215,7.68341751 1.69526215,8.31658249 2.08578644,8.70710678 C2.47631073,9.09763107 3.10947571,9.09763107 3.5,8.70710678 L8.20710678,4 L3.5,-0.707106781 C3.10947571,-1.09763107 2.47631073,-1.09763107 2.08578644,-0.707106781 C1.69526215,-0.316582489 1.69526215,0.316582489 2.08578644,0.707106781 L5.37867966,4 L2.08578644,7.29289322 Z" transform="translate(5.000000, 4.000000) rotate(-90.000000) translate(-5.000000, -4.000000) " />
  </svg>
)

const X = () => (
  <svg viewBox="0 0 16 16">
    <path d="M2 .594l-1.406 1.406.688.719 5.281 5.281-5.281 5.281-.688.719 1.406 1.406.719-.688 5.281-5.281 5.281 5.281.719.688 1.406-1.406-.688-.719-5.281-5.281 5.281-5.281.688-.719-1.406-1.406-.719.688-5.281 5.281-5.281-5.281-.719-.688z" />
  </svg>
)

const Check = () => (
  <svg viewBox="0 0 16 16">
    <path d="M13 .156l-1.406 1.438-5.594 5.594-1.594-1.594-1.406-1.438-2.844 2.844 1.438 1.406 3 3 1.406 1.438 1.406-1.438 7-7 1.438-1.406-2.844-2.844z" transform="translate(0 1)" />
  </svg>
)

ReactDOM.render(
  <div>
    <Select
      label="React Select"
      placeholder="Pick one"
      options={[
        { value: 'Rock' },
        { value: 'Paper' },   
        { value: 'Scissors' }
      ]}
    />
    <span style={{ display: 'inline-block', width: 20 }} />
    <Select
      label="React Multiple Select"
      placeholder="Pick some"
      options={[
        { value: 'Rock' },
        { value: 'Paper' },
        { value: 'Scissors' }
      ]}
      multiple
    />
    <span style={{ display: 'inline-block', width: 20 }} />
    <select>
      <option>Rock</option>
      <option>Paper</option>
      <option>Scissors</option>
    </select>
  </div>,
  document.getElementById('root')
)
!
999px

Console