19 - 切换焦点指令

[cone41]

<script setup lang="ts">
import { ref } from 'vue';

const state = ref(false);

/**
 * Implement the custom directive
 * Make sure the input element focuses/blurs when the 'state' is toggled
 *
 */

const VFocus = {
  mounted: (el, binding) => {
    binding.value && el.focus();
  },
  updated: (el, binding) => {
    binding.value ? el.focus() : el.blur();
  },
};

setInterval(() => {
  state.value = !state.value;
}, 2000);
</script>

<template>
  <input v-focus="state" type="text" />
</template>