Multi level hierarchy

Multiple selects can be linked together as a hierarchy. A region > division > subdivision is a great example of such a hierarchy where each level is dynamically populated based on the selection of the previous level.

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Code

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import { Select, setOptions  } from '@mobiscroll/react';
import { useCallback, useMemo, useState } from 'react';

setOptions({
  locale:  ,
  theme: ' ',
  themeVariant: ' '
});

function App() {
  const [divDisabled, setDivDisabled] = useState(true);
  const [subDisabled, setSubDisabled] = useState(true);
  const [divData, setDivData] = useState([]);
  const [subData, setSubData] = useState([]);

  const regions = useMemo(
    () => [
      { value: 'reg-1', text: 'Northeast' },
      { value: 'reg-2', text: 'Midwest' },
      { value: 'reg-3', text: 'South' },
      { value: 'reg-4', text: 'West' },
    ],
    [],
  );

  const divisions = useMemo(
    () => ({
      'reg-1': [
        { value: 'div-1', text: 'New England' },
        { value: 'div-2', text: 'Mid-Atlantic' },
      ],
      'reg-2': [
        { value: 'div-3', text: 'East North Central' },
        { value: 'div-4', text: 'West North Central' },
      ],
      'reg-3': [
        { value: 'div-5', text: 'South Atlantic' },
        { value: 'div-6', text: 'East South Central' },
        { value: 'div-7', text: 'West South Central' },
      ],
      'reg-4': [
        { value: 'div-8', text: 'Mountain' },
        { value: 'div-9', text: 'Pacific' },
      ],
    }),
    [],
  );

  const subdivisions = useMemo(
    () => ({
      'div-1': [
        { value: 'sub-1', text: 'Connecticut' },
        { value: 'sub-2', text: 'Maine' },
        { value: 'sub-3', text: 'Massachusetts' },
        { value: 'sub-4', text: 'New Hampshire' },
        { value: 'sub-5', text: 'Rhode Island' },
        { value: 'sub-6', text: 'Vermont' },
      ],
      'div-2': [
        { value: 'sub-7', text: 'New Jersey' },
        { value: 'sub-8', text: 'New York' },
        { value: 'sub-9', text: 'Pennsylvania' },
      ],
      'div-3': [
        { value: 'sub-10', text: 'Illinois' },
        { value: 'sub-11', text: 'Indiana' },
        { value: 'sub-12', text: 'Michigan' },
        { value: 'sub-13', text: 'Ohio' },
      ],
      'div-4': [
        { value: 'sub-14', text: 'Wisconsin' },
        { value: 'sub-15', text: 'Iowa' },
        { value: 'sub-16', text: 'Kansas' },
        { value: 'sub-17', text: 'Minnesota' },
        { value: 'sub-18', text: 'Missouri' },
        { value: 'sub-19', text: 'Nebraska' },
        { value: 'sub-20', text: 'North Dakota' },
        { value: 'sub-21', text: 'South Dakota' },
      ],
      'div-5': [
        { value: 'sub-22', text: 'Delaware' },
        { value: 'sub-23', text: 'Florida' },
        { value: 'sub-24', text: 'Georgia' },
        { value: 'sub-25', text: 'Maryland' },
        { value: 'sub-26', text: 'North Carolina' },
        { value: 'sub-27', text: 'South Carolina' },
        { value: 'sub-28', text: 'Virginia' },
        { value: 'sub-29', text: 'District of Columbia' },
        { value: 'sub-30', text: 'West Virginia' },
      ],
      'div-6': [
        { value: 'sub-31', text: 'Alabama' },
        { value: 'sub-32', text: 'Kentucky' },
        { value: 'sub-33', text: 'Mississippi' },
        { value: 'sub-34', text: 'Tennessee' },
      ],
      'div-7': [
        { value: 'sub-35', text: 'Arkansas' },
        { value: 'sub-36', text: 'Louisiana' },
        { value: 'sub-37', text: 'Oklahoma' },
        { value: 'sub-38', text: 'Texas' },
      ],
      'div-8': [
        { value: 'sub-39', text: 'Arizona' },
        { value: 'sub-40', text: 'Colorado' },
        { value: 'sub-41', text: 'Idaho' },
        { value: 'sub-42', text: 'Montana' },
        { value: 'sub-43', text: 'Nevada' },
        { value: 'sub-44', text: 'New Mexico' },
        { value: 'sub-45', text: 'Utah' },
        { value: 'sub-46', text: 'Wyoming' },
      ],
      'div-9': [
        { value: 'sub-47', text: 'Alaska' },
        { value: 'sub-48', text: 'California' },
        { value: 'sub-49', text: 'Hawaii' },
        { value: 'sub-50', text: 'Oregon' },
        { value: 'sub-51', text: 'Washington' },
      ],
    }),
    [],
  );

  const getData = useCallback(
    (region, division) => {
      let arr = [];

      if (division) {
        arr = subdivisions[division];
      } else if (region) {
        arr = divisions[region];
      } else {
        arr = regions;
      }

      return arr;
    },
    [divisions, regions, subdivisions],
  );

  const regChange = useCallback(
    (event) => {
      setDivData(getData(event.value, null));
      setDivDisabled(false);
      setSubDisabled(true);
    },
    [getData],
  );

  const divChange = useCallback(
    (event) => {
      const val = event.value;
      if (val) {
        setSubData(getData(null, event.value));
        setSubDisabled(false);
      } else {
        setSubData([]);
        setSubDisabled(true);
      }
    },
    [getData],
  );

  return (
    <div className="mbsc-grid mbsc-grid-fixed mbsc-no-padding">
      <div className="mbsc-row">
        <div className="mbsc-col-sm-12">
          <div className="mbsc-form-group-inset">
            <Select data={getData(null, null)} touchUi={false} label="Region" placeholder="Please select..." onChange={regChange} />
            <Select
              data={divData}
              touchUi={false}
              disabled={divDisabled}
              label="Division"
              placeholder="Please select..."
              onChange={divChange}
            />
            <Select data={subData} touchUi={false} disabled={subDisabled} label="Subivision" placeholder="Please select..." />
          </div>
        </div>
      </div>
    </div>
  );
}

export default App;

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