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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<script setup>
import { MbscPage, MbscSelect, setOptions  } from '@mobiscroll/vue'
import { ref } from 'vue'

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

const regions = [
  { value: 'reg-1', text: 'Northeast' },
  { value: 'reg-2', text: 'Midwest' },
  { value: 'reg-3', text: 'South' },
  { value: 'reg-4', text: 'West' }
]
const divisions = {
  '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 = {
  '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 divDisabled = ref(true)
const subDisabled = ref(true)
const divData = ref([])
const subData = ref([])

function getData(region, division) {
  let arr = []

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

  return arr
}

function regChange(event) {
  divData.value = getData(event.value, null)
  divDisabled.value = false
  subDisabled.value = true
}

function divChange(event) {
  const val = event.value
  if (val) {
    subData.value = getData(null, event.value)
    subDisabled.value = false
  } else {
    subData.value = []
    subDisabled.value = true
  }
}
</script>

<template>
  <MbscPage>
    <div class="mbsc-grid mbsc-grid-fixed mbsc-no-padding">
      <div class="mbsc-row">
        <div class="mbsc-col-sm-12">
          <div class="mbsc-form-group-inset">
            <MbscSelect
              :data="getData(null, null)"
              :touchUi="false"
              label="Region"
              placeholder="Please select..."
              @change="regChange"
            />
            <MbscSelect
              :data="getData(null, null)"
              :touchUi="false"
              :disabled="divDisabled"
              label="Division"
              placeholder="Please select..."
              @change="divChange"
            />
            <MbscSelect
              :data="getData(null, null)"
              :touchUi="false"
              :disabled="subDisabled"
              label="Subivision"
              placeholder="Please select..."
            />
          </div>
        </div>
      </div>
    </div>
  </MbscPage>
</template>

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