How to mount vue components globally? Introduction to the method of mounting Vue components globally (code)

This article introduces to you how to mount vue components globally? The introduction (code) of the method of mounting Vue components to the global system has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

In a recent project, bootstrap-vue was used for development. However, during the actual development process, we found that the components provided by this UI could not achieve the results we expected, such as alert and modal. When the component is introduced on each page, it must be introduced repeatedly. Unlike element, which can be called through this.$xxx, the question is, how to call the component we defined or the UI we use through this.$xxx? What about the components of the framework.
Taking the Alert component in bootstrap-vue as an example, proceed in several steps:

1. Define a vue file to re-encapsulate the original component

main.vue

<template>
  <b-alert
    class="alert-wrap pt-4 pb-4"
    :show="isAutoClose"
    :variant="type" dismissible
    :fade="true"
    @dismiss-count-down="countDownChanged"
    @dismissed="dismiss"
    >
     {{msg}}
    </b-alert>
</template>
<script>
export default {
  /**
   * 参考: https://bootstrap-vue.js.org/docs/components/alert
   * @param {string|number} msg 弹框内容
   * @param {tstring} type 弹出框类型 对应bootstrap-vue中variant 可选值有：'primary'、'secondary'、'success'、'danger'、'warning'、'info'、'light'、'dark'默认值为 'info'
   * @param {boolean} autoClose 是否自动关闭弹出框
   * @param {number} duration 弹出框存在时间(单位：秒)
   * @param {function} closed 弹出框关闭，手动及自动关闭都会触发
   */
  props: {
    msg: {
      type: [String, Number],
      default: ''
    },
    type: {
      type: String,
      default: 'info'
    },
    autoClose: {
      type: Boolean,
      default: true
    },
    duration: {
      type: Number,
      default: 3
    },
    closed: {
      type: Function,
      default: null
    }
  },
  methods: {
    dismiss () {
      this.duration = 0
    },
    countDownChanged (duration) {
      this.duration = duration
    }
  },
  computed: {
    isAutoClose () {
      if (this.autoClose) {
        return this.duration
      } else {
        return true
      }
    }
  },
  watch: {
    duration () {
      if (this.duration === 0) {
        if (this.closed) this.closed()
      }
    }
  }
}
</script>
<style scoped>
.alert-wrap {
  position: fixed;
  width: 600px;
  top: 80px;
  left: 50%;
  margin-left: -200px;
  z-index: 2000;
  font-size: 1.5rem;
}
</style>

This is mainly about the processing of component parameters and callback events, which is no different from other processing components

2. Define a js file and mount it on Vue, and match it with the one we defined Components interact

index.js

import Alert from './main.vue'
import Vue from 'vue'
let AlertConstructor = Vue.extend(Alert)
let instance
let seed = 1
let index = 2000
const install = () => {
  Object.defineProperty(Vue.prototype, '$alert', {
    get () {
      let id = 'message_' + seed++
      const alertMsg = options => {
        instance = new AlertConstructor({
          propsData: options
        })
        index++
        instance.id = id
        instance.vm = instance.$mount()
        document.body.appendChild(instance.vm.$el)
        instance.vm.$el.style.zIndex = index
        return instance.vm
      }
      return alertMsg
    }
  })
}
export default install

The main idea is to pass the value to the component by calling this method, and then append it to the body

3. Finally, it needs to be in main. Use it in js

import Alert from '@/components/alert/index'
Vue.use(Alert)

4. Use

this.$alert({msg: '欢迎━(*｀∀´*)ノ亻!'})

5. The encapsulation of confirim is also the same

main.vue

<template>
  <b-modal
    v-if="!destroy"
    v-model="isShow"
    title="温馨提示"
    @change="modalChange"
    @show="modalShow"
    @shown="modalShown"
    @hide="modalHide"
    @hidden="modalHidden"
    @ok="modalOk"
    @cancel="modalCancel"
    :centered="true"
    :hide-header-close="hideHeaderClose"
    :no-close-on-backdrop="noCloseOnBackdrop"
    :no-close-on-esc="noCloseOnEsc"
    :cancel-title="cancelTitle"
    :ok-title="okTitle">
      <p class="my-4">{{msg}}</p>
  </b-modal>
</template>
<script>
export default {
  /**
   * 参考: https://bootstrap-vue.js.org/docs/components/modal
   * @param {boolean} isShow 是否显示modal框
   * @param {string|number} msg 展示内容
   * @param {boolean} hideHeaderClose 是否展示右上角关闭按钮 默认展示
   * @param {string} cancelTitle 取消按钮文字
   * @param {string} okTitle 确定按钮文字
   * @param {boolean} noCloseOnBackdrop 能否通过点击外部区域关闭弹框
   * @param {boolean} noCloseOnEsc 能否通过键盘Esc按键关闭弹框
   * @param {function} change 事件触发顺序： show -> change -> shown -> cancel | ok -> hide -> change -> hidden
   * @param {function} show before modal is shown
   * @param {function} shown modal is shown
   * @param {function} hide before modal has hidden
   * @param {function} hidden after modal is hidden
   * @param {function} ok 点击'确定'按钮
   * @param {function} cancel 点击'取消'按钮
   * @param {Boolean} destroy 组件是否销毁 在官方并没有找到手动销毁组件的方法，只能通过v-if来实现
   */
  props: {
    isShow: {
      type: Boolean,
      default: true
    },
    msg: {
      type: [String, Number],
      default: ''
    },
    hideHeaderClose: {
      type: Boolean,
      default: false
    },
    cancelTitle: {
      type: String,
      default: '取消'
    },
    okTitle: {
      type: String,
      default: '确定'
    },
    noCloseOnBackdrop: {
      type: Boolean,
      default: true
    },
    noCloseOnEsc: {
      type: Boolean,
      default: true
    },
    change: {
      type: Function,
      default: null
    },
    show: {
      type: Function,
      default: null
    },
    shown: {
      type: Function,
      default: null
    },
    hide: {
      type: Function,
      default: null
    },
    hidden: {
      type: Function,
      default: null
    },
    ok: {
      type: Function,
      default: null
    },
    cancel: {
      type: Function,
      default: null
    },
    destroy: {
      type: Boolean,
      default: false
    }
  },
  methods: {
    modalChange () {
      if (this.change) this.change()
    },
    modalShow () {
      if (this.show) this.show()
    },
    modalShown () {
      if (this.shown) this.shown()
    },
    modalHide () {
      if (this.hide) this.hide()
    },
    modalHidden () {
      if (this.hidden) this.hidden()
      this.destroy = true
    },
    modalOk () {
      if (this.ok) this.ok()
    },
    modalCancel () {
      if (this.cancel) this.cancel()
    }
  }
}
</script>

index.js

import Confirm from './main.vue'
import Vue from 'vue'
let ConfirmConstructor = Vue.extend(Confirm)
let instance
let seed = 1
let index = 1000
const install = () => {
  Object.defineProperty(Vue.prototype, '$confirm', {
    get () {
      let id = 'message_' + seed++
      const confirmMsg = options => {
        instance = new ConfirmConstructor({
          propsData: options
        })
        index++
        instance.id = id
        instance.vm = instance.$mount()
        document.body.appendChild(instance.vm.$el)
        instance.vm.$el.style.zIndex = index
        return instance.vm
      }
      return confirmMsg
    }
  })
}
export default install

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