bootstrap-vue/src/components/table/helpers/mixin-busy.js

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import { isFunction } from '../../../utils/inspect'
import { BTr } from '../tr'
import { BTd } from '../td'

const busySlotName = 'table-busy'

export default {
  props: {
    busy: {
      type: Boolean,
      default: false
    }
  },
  data() {
    return {
      localBusy: false
    }
  },
  computed: {
    computedBusy() {
      return this.busy || this.localBusy
    }
  },
  watch: {
    localBusy(newVal, oldVal) {
      if (newVal !== oldVal) {
        this.$emit('update:busy', newVal)
      }
    }
  },
  methods: {
    // Event handler helper
    stopIfBusy(evt) {
      if (this.computedBusy) {
        // If table is busy (via provider) then don't propagate
        evt.preventDefault()
        evt.stopPropagation()
        return true
      }
      return false
    },
    // Render the busy indicator or return `null` if not busy
    renderBusy() {
      const h = this.$createElement

      // Return a busy indicator row, or `null` if not busy
      if (this.computedBusy && this.hasNormalizedSlot(busySlotName)) {
        // Show the busy slot
        return h(
          BTr,
          {
            key: 'table-busy-slot',
            staticClass: 'b-table-busy-slot',
            class: [
              isFunction(this.tbodyTrClass)
                ? this.tbodyTrClass(null, busySlotName)
                : this.tbodyTrClass
            ],
            attrs: isFunction(this.tbodyTrAttr)
              ? this.tbodyTrAttr(null, busySlotName)
              : this.tbodyTrAttr
          },
          [
            h(BTd, { props: { colspan: this.computedFields.length || null } }, [
              this.normalizeSlot(busySlotName)
            ])
          ]
        )
      } else {
        // We return `null` here so that we can determine if we need to
        // render the table items rows or not
        return null
      }
    }
  }
}