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CSS

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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              <html>
  <head>
    <link href="https://fonts.googleapis.com/css?family=Roboto" rel="stylesheet">
  </head>
  <body>
     <div id="app"></div>
  </body>
</html>

            
          
!

CSS

            
              body {
  font-size: 18px;
  font-family: 'Roboto', sans-serif;
  background: white;
}

.alertElement {
  color: white;
  position: fixed;
  background-color: #21252E;
  right: 10px;
  bottom: 10px;
  height: 300px;
  width: 300px;
  border-radius: 10px;
  padding: 10px;
  box-sizing: border-box;
  box-shadow: 4px 8px 16px 0 rgba(0,0,0,0.4);
  visibility: hidden;
  overflow: scroll;
  h2 {
    margin: 0px;
    margin-bottom: 10px;
  }

}

.container {
    width: 98vw;
  height: 98vh;
    display: flex;
  justify-content: center;
  align-items: center;
}

.wrapper {
  box-shadow: 4px 8px 16px 0 rgba(0,0,0,0.4);
  background: #4A627A;
  padding: 20px;
  margin: 50px;
  min-width: 320px;
  min-height: 500px;
  transition: 1s;
  overflow: scroll;
  width: 70%;
  height: 70vw;
  max-width: 80vh;
  max-height: 80vh;
  position: relative;
  border-radius: 10px;
  .data-structure {
    position: absolute;
    color: white;
    padding: 10px;
    background-color: #21252E;
    box-shadow: 4px 8px 16px 0 rgba(0,0,0,0.4);
    top: 0px;
    right: 20px;
    border-radius: 10px;
    
  }
  .data-structure-button {
    position: absolute;
    top: 16px;
    right: 65px;
    .actual {
      position: fixed;
      box-shadow: 4px 8px 16px 0 rgba(0,0,0,0.4);
    
    width: 50px;
    height: 50px;
    box-sizing: border-box;
    background: white;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    cursor: pointer;
    z-index: 100;
    transition: 0.5s;
    }
  }
  
  .debug-button {
    position: absolute;
    top: 80px;
    right: 65px;
    .actual-debug {
      position: fixed;
      box-shadow: 4px 8px 16px 0 rgba(0,0,0,0.4);
    
      width: 50px;
      height: 50px;
      box-sizing: border-box;
      background: white;
      display: flex;
      justify-content: center;
      align-items: center;
      border-radius: 50%;
      cursor: pointer;
      z-index: 100;
      transition: 0.5s;
    }
    .active-debug-button {
      transform: translateX(50px) rotate(-45deg);
    }
    .is-debugging {
      background-color: #80cbc4;
    }
  }
  
  .active-button {
    transform: translate(30px, -30px) rotate(30deg); /* Equal to rotateZ(45deg) */
  }
  
  .firstUL{
    transform: translateX(-90px);
  }
  h1{
    color: white;
  }
  .checkbox {
    display: flex;
    align-items: center;
    transform: translate(60px);

    margin: 10px;
    &__label {
      font-size: 24px;
      font-weight: 700;
      color: white;
    }
    &__icon {
      width: 50px;
      cursor: pointer;
      color: white;
      
    }
  }
}
            
          
!

JS

            
              // Arbitrarily nested data
const toppingOptions = [
  {
    name: "Pepperoni",
    id: "pepperoni-id",
    subOptions: [
      {
        name: "Spicy",
        id: "spicy-id",
        subOptions: []
      },
      {
        name: "Regular",
        id: "regular-id",
        subOptions: []
      }
    ]
  },
  {
    name: "Chicken",
    id: "chicken-id",
    subOptions: [
      {
        name: "Buffalo",
        id: "buffalo-id",
        subOptions: [
          {
            name: "Mild",
            id: 'mild-id',
            subOptions: [],
          },
          {
            name: "Hot",
            id: 'hot-id',
            subOptions: [
              {
                name: 'Jalapeño',
                id: 'jalapeno-id',
                subOptions: []
              },
              {
                name: 'Cayenne',
                id: 'cayenne-id',
                subOptions: []
              }
            ],
          },
        ]
      },
      {
        name: "BBQ",
        id: 'bbq-id',
        subOptions: [],
      }
    ]
  },
]

// Root component -> Manages all app state
class App extends React.Component {    
  state = {
    selectedOptions: {}
  }

  render() {
     return (
       <div>
         <h1>Toppings</h1>
         <OptionsList 
           options={toppingOptions} 
           onChange={(selectedOptions) => this.setState({selectedOptions})}
           selectedOptions={this.state.selectedOptions} 
         />
       </div>
     )
  }
}

// Recursive component
const OptionsList = ({ options, selectedOptions, onChange }) => {
 
  const handleCheckboxClicked = (selectedOptionId) => {
    // is currently selected
    if(selectedOptions[selectedOptionId]){
      // remove selected key from options list
      delete selectedOptions[selectedOptionId]; 
    } else { // is not currently selected
      // Add selected key to optionsList
      selectedOptions[selectedOptionId] = {} 
    }
    // call onChange function given by parent
    onChange(selectedOptions) 
  }
  
  const handleSubOptionsListChange = (optionId, subSelections) => {
    // add sub selections to current optionId
    selectedOptions[optionId] = subSelections;
    // call onChange function given by parent
    onChange(selectedOptions);
  }
  
  return (
    <div>
      {options.map(option => (
        <ul>
          <Checkbox 
            selected={selectedOptions[option.id]} 
            label={option.name} 
            onChange={() => {handleCheckboxClicked(option.id)}}
           />
          {/* Base Case */}
          {(option.subOptions.length > 0 && selectedOptions[option.id]) &&
            <OptionsList
              options={option.subOptions}
              selectedOptions={selectedOptions[option.id]} 
              onChange={(subSelections) => handleSubOptionsListChange(option.id, subSelections)}
             />
          }
        </ul>
      ))}
    </div>
  )
}

// Dumb checkbox component, completly controlled by parent
const Checkbox = ({ selected, label, onChange }) => {
  return (
    <div>
      <div
        className="checkbox" 
        onClick={() => onChange(!selected)} 
      /> 
      <div className="label">{label}</div>
    </div>
  )
}







































































// Actual Code
class App2 extends React.Component {  
  constructor(props){
    super(props)
    this.state = {
      selectedOptions: {},
      codeShowing: false,
      debug: false
    }
  }
  
  button(){
    return (
      <div className="data-structure-button">
            <div onClick={() => this.setState({codeShowing: !this.state.codeShowing})} 
             className={classNames('fa', 'fa-2x', 'fa-code', 'actual', this.state.codeShowing && 'active-button')}>
           </div>
      </div>

      )
  }
  
  debugButton(){
    return (
      <div className="debug-button">
        <div onClick={() => this.setState({debug: !this.state.debug})} 
          className={classNames(
            'fa',
            'fa-2x',
            'fa-bug',
            'actual-debug',
            this.state.codeShowing && 'active-debug-button',
            this.state.debug && 'is-debugging')}>
        </div>
      </div>
    )
  }
  
  getDataStructureDisplay(){
    return (

        <pre className="data-structure"><code class="json">{JSON.stringify(this.state.selectedOptions, null, 3)}</code></pre>
    )
  }
  
  render() {
    const {selectedOptions} = this.state;
     return (
       <div className="container">
         <div className="wrapper">
           <h1>Toppings</h1>
           <OptionsList2 
             options={toppingOptions} 
             onChange={(selectedOptions) => {
               if(this.state.debug){
                 alert(`App Component:\n\nSetting selectedOptions state to\n\n${JSON.stringify(selectedOptions, null, 3)}\n\nThen re-rendering!`)
               }
               this.setState({selectedOptions})
             }}
             selectedOptions={selectedOptions} 
             isFirst={true}
             debug={this.state.debug}
             />
           {this.button()}
           {this.debugButton()}
           
           {this.state.codeShowing && this.getDataStructureDisplay()}
         </div>
       </div>
     )
  }
}
const OptionsList2 = ({ options, selectedOptions, onChange, isFirst, debug }) => {
 
  const handleCheckboxClicked = (selectedOptionId) => {
    let additionalText = `${selectedOptionId} is already selected, to deselect it we'll remove it from the current selectedOptions structure\n\n${JSON.stringify(selectedOptions, null, 3)}`;
    if(selectedOptions[selectedOptionId]){
      delete selectedOptions[selectedOptionId];
    } else {
      selectedOptions[selectedOptionId] = {}
      additionalText = `${selectedOptionId} is not currently selected, to select it we'll add "${selectedOptionId}: {}" to the current selectedOptions structure\n\n${JSON.stringify(selectedOptions, null, 3)}`;
    }
    if(debug){
      alert(`handleCheckboxClicked():\n\nClicked ${selectedOptionId} checkbox\n\n${additionalText}\n\nThen we'll call the current OptionList's onChange() function with the updated selectedOptions structure`);
    }
    onChange(selectedOptions)
  }
  
  const handleSubOptionsListChange = (optionId, subSelections) => {
    if(debug){
      alert(`handleSubOptionsListChange():\n\nThe onChange() function of ${optionId} was just called with the following sub options\n\n${JSON.stringify(subSelections, null, 3)}\n\nWe'll set "${optionId}" equal to that and pass the entire subOption structure at this level up to the parent.\n\n${JSON.stringify(selectedOptions, null, 3)}`);
    }
    selectedOptions[optionId] = subSelections;
    onChange(selectedOptions);
  }
  
  return (
    <div>
      {options.map(option => (
          <ul className={isFirst && "firstUL"}>
            <Checkbox2 
              selected={selectedOptions[option.id]} 
              label={option.name} 
              onChange={() => {handleCheckboxClicked(option.id)}}
            />
            {(option.subOptions.length > 0 && selectedOptions[option.id]) &&
              <OptionsList2 
                options={option.subOptions} 
                selectedOptions={selectedOptions[option.id]} 
                onChange={(subSelections) => handleSubOptionsListChange(option.id, subSelections)}
                debug={debug}
              />
            }
          </ul>
        )
      )}
    </div>
  )
}
const Checkbox2 = ({ selected, label, onChange }) => {
  return (
      <div className="checkbox">
      <div 
        className={
          classNames('fa', 'fa-2x', 'checkbox__icon', selected ? 'fa-check-square' : 'fa-square')} onClick={() => onChange(!selected)}></div>    
      <div className="checkbox__label">{label}</div>
    </div>
  )
}
ReactDOM.render(<App2 />, document.querySelector('#app'))

            
          
!
999px

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