bootstrap-vue/src/components/form-select/form-select.js

BootstrapVue, with over 40 plugins and more than 80 custom components, provides one of the most comprehensive implementations of Bootstrap v4 components and grid system for Vue.js. With extensive and automated WAI-ARIA accessibility markup.

import Vue from '../../utils/vue'
import idMixin from '../../mixins/id'
import formOptionsMixin from '../../mixins/form-options'
import formMixin from '../../mixins/form'
import formSizeMixin from '../../mixins/form-size'
import formStateMixin from '../../mixins/form-state'
import formCustomMixin from '../../mixins/form-custom'
import normalizeSlotMixin from '../../mixins/normalize-slot'
import { from as arrayFrom } from '../../utils/array'
import { htmlOrText } from '../../utils/html'

// @vue/component
export const BFormSelect = /*#__PURE__*/ Vue.extend({
  name: 'BFormSelect',
  mixins: [
    idMixin,
    normalizeSlotMixin,
    formMixin,
    formSizeMixin,
    formStateMixin,
    formCustomMixin,
    formOptionsMixin
  ],
  model: {
    prop: 'value',
    event: 'input'
  },
  props: {
    value: {
      // type: [Object, Array, String, Number, Boolean],
      // default: undefined
    },
    multiple: {
      type: Boolean,
      default: false
    },
    selectSize: {
      // Browsers default size to 0, which shows 4 rows in most browsers in multiple mode
      // Size of 1 can bork out Firefox
      type: Number,
      default: 0
    },
    ariaInvalid: {
      type: [Boolean, String],
      default: false
    }
  },
  data() {
    return {
      localValue: this.value
    }
  },
  computed: {
    computedSelectSize() {
      // Custom selects with a size of zero causes the arrows to be hidden,
      // so dont render the size attribute in this case
      return !this.plain && this.selectSize === 0 ? null : this.selectSize
    },
    inputClass() {
      return [
        this.plain ? 'form-control' : 'custom-select',
        this.size && this.plain ? `form-control-${this.size}` : null,
        this.size && !this.plain ? `custom-select-${this.size}` : null,
        this.stateClass
      ]
    },
    computedAriaInvalid() {
      if (this.ariaInvalid === true || this.ariaInvalid === 'true') {
        return 'true'
      }
      return this.stateClass === 'is-invalid' ? 'true' : null
    }
  },
  watch: {
    value(newVal, oldVal) {
      this.localValue = newVal
    },
    localValue(newVal, oldVal) {
      this.$emit('input', this.localValue)
    }
  },
  methods: {
    focus() {
      this.$refs.input.focus()
    },
    blur() {
      this.$refs.input.blur()
    }
  },
  render(h) {
    const options = this.formOptions.map((option, index) => {
      return h('option', {
        key: `option_${index}_opt`,
        attrs: { disabled: Boolean(option.disabled) },
        domProps: { ...htmlOrText(option.html, option.text), value: option.value }
      })
    })
    return h(
      'select',
      {
        ref: 'input',
        class: this.inputClass,
        directives: [
          {
            name: 'model',
            rawName: 'v-model',
            value: this.localValue,
            expression: 'localValue'
          }
        ],
        attrs: {
          id: this.safeId(),
          name: this.name,
          form: this.form || null,
          multiple: this.multiple || null,
          size: this.computedSelectSize,
          disabled: this.disabled,
          required: this.required,
          'aria-required': this.required ? 'true' : null,
          'aria-invalid': this.computedAriaInvalid
        },
        on: {
          change: evt => {
            const target = evt.target
            const selectedVal = arrayFrom(target.options)
              .filter(o => o.selected)
              .map(o => ('_value' in o ? o._value : o.value))
            this.localValue = target.multiple ? selectedVal : selectedVal[0]
            this.$nextTick(() => {
              this.$emit('change', this.localValue)
            })
          }
        }
      },
      [this.normalizeSlot('first'), options, this.normalizeSlot('default')]
    )
  }
})