element-plus/packages/loading/src/directive.ts

import Loading from './index'

const createInstance = (el, binding) => {
  const textExr = el.getAttribute('element-loading-text')
  const spinnerExr = el.getAttribute('element-loading-spinner')
  const backgroundExr = el.getAttribute('element-loading-background')
  const customClassExr = el.getAttribute('element-loading-custom-class')
  const vm = binding.instance
  el.instance = Loading({
    text: vm && vm[textExr] || textExr,
    spinner: vm && vm[spinnerExr] || spinnerExr,
    background: vm && vm[backgroundExr] || backgroundExr,
    customClass: vm && vm[customClassExr] || customClassExr,
    fullscreen: !!binding.modifiers.fullscreen,
    target: !!binding.modifiers.fullscreen ? null : el,
    body: !!binding.modifiers.body,
    visible: true,
    lock: !!binding.modifiers.lock,
  })
}

const vLoading = {
  mounted(el, binding) {
    if(!!binding.value){
      createInstance(el, binding)
    }
  },
  updated(el, binding) {
    const instance = el.instance
    if (binding.oldValue !== binding.value) {
      if(binding.value) {
        createInstance(el, binding)
      } else {
        instance.close()
      }
    }
  },
  unmounted(el) {
    el?.instance?.close()
  },
}

export default vLoading