动效预览

最近在做毕业设计, 想给毕设系统加上一个仿苹果系统的侧边消息提示框, 让我们先来看看效果.

其他UI库

熟悉前端开发的同学可能发现了, 在 Element UI 中这个组件叫 Notification 通知; 在Bootstrap 中这个组件叫 Toasts.

开始

当初看到这个组件就觉得很酷炫, 今天就带大家看一下我是怎么一步一步实现的, 有不对或者可以优化的地方请各位大佬点评. (本次组件基于 Vue3 实现)

组件目录结构

Toasts
|
| -- index.js         // 注册组件, 定义全局变量以便调用
|
| -- instance.js      // 手动实例创建前后的逻辑
| 
| -- toasts.vue       // 消息提示 HTMl 部分
|
| -- toastsBus.js     // 解决 vue3 去除 $on和$emit 的解决方案
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toasts.vue

大概的DOM结构

截屏2021-12-16 上午8.26.21.png

<!-- 弹窗 -->
<div class="toast-container">
    <!-- icon图标 -->
    <template>
        ...
    </template>
    <!-- 主要内容 -->
    <div class="toast-content">
        <!-- 标题及其倒计时 -->
        <div class="toast-head">
            ...
        </div>
        <!-- body -->
        <div class="toast-body">...</div>
        <!-- 操作按钮 -->
        <div class="toast-operate">
            ...
        </div>
    </div>
    <!-- 关闭 -->
    <div class="toast-close">
        <i class="fi fi-rr-cross-small"></i>
    </div>
</div>
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index.js

注册组件 & 定义全局变量

在这里我们注册组件, 定义全局变量以便调用

import toast from './instance'
import Toast from './toasts.vue'

export default (app) => {
    // 注册组件
    app.component(Toast.name, Toast);
    // 注册全局变量, 后续只需调用 $Toast({}) 即可
    app.config.globalProperties.$Toast = toast;
}
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instance.js

手动挂载实例

这里是全文的重点

首先我们学习如何将组件手动挂载至页面

import { createApp } from 'vue';
import Toasts from './toasts'

const toasts = (options) => {
    // 创建父容器
    let root = document.createElement('div');
    document.body.appendChild(root)
    // 创建Toasts实例
    let ToastsConstructor = createApp(Toasts, options)
    // 挂载父亲元素
    let instance = ToastsConstructor.mount(root)
    // 抛出实例本身给vue
    return instance
}
export default toasts;
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给每一个创建的 toasts 正确的定位

如图所示, 每创建一个 toasts 将会排列到上一个 toasts 的下方(这里的间隙为16px). 想要做到这种效果我们需要知道 已存在 的toasts 的高度.

// instance.js

// 这里我们需要定义一个数组来存放当前存活的 toasts
let instances = []

const toasts = (options) => {
    ...
    // 创建后将实例加入数组
    instances.push(instance)

    // 重制高度
    let verticalOffset = 0
    // 遍历获取当前已存活的 toasts 高度及其间隙 累加
    instances.forEach(item => {
        verticalOffset += item.$el.offsetHeight + 16
    })
    // 累加本身需要的间隙
    verticalOffset += 16
    // 赋值当前实例y轴方向便宜长度
    instance.toastPosition.y = verticalOffset
    ...
}
export default toasts;
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加入 主动&定时 关闭功能

让我们先来分析一下这里的业务:

• 定时关闭: 在 toast 创建时给一个自动关闭时间, 当计时器结束后自动关闭.
• 主动关闭: 点击关闭按钮关闭 toast.

在这个基础上我们可以加上一些人性化的操作, 例如鼠标移入某个 toast 时停止它的自动关闭(其他 toast 不受影响), 当鼠标移开时重新启用它的自动关闭.

<!-- toasts.vue -->
<template>
    <transition name="toast" @after-leave="afterLeave" @after-enter="afterEnter">
        <div ref="container" class="toast-container" :style="toastStyle" v-show="visible" @mouseenter="clearTimer" @mouseleave="createTimer">
            ...
            <!-- 关闭 -->
            <div class="toast-close"  @click="destruction">
                <i class="fi fi-rr-cross-small"></i>
            </div>
        </div>
    </transition>
</template>

<script>
import Bus from './toastsBus'
import {ref, computed, onMounted, onBeforeUnmount} from 'vue'
export default {
    props: {
        // 自动关闭时间 (单位毫秒)
        autoClose: {
            type: Number,
            default: 4500
        }
    },
    setup(props){
        // 是否显示
        const visible = ref(false);  

        // toast容器实例
        const container = ref(null);
        // toast本身高度
        const height = ref(0);

        // toast位置
        const toastPosition = ref({
            x: 16,
            y: 16
        })
        const toastStyle = computed(()=>{
            return {
                top: `${toastPosition.value.y}px`,
                right: `${toastPosition.value.x}px`,
            }
        })

        // toast的id
        const id = ref('')

        // toast离开动画结束后
        function afterLeave(){
            // 告诉 instance.js 需要进行关闭操作 ()
            Bus.$emit('closed',id.value);
        }
        // toast进入动画结束后
        function afterEnter(){
            height.value = container.value.offsetHeight
        }

        // 定时器
        const timer = ref(null);

        // 鼠标进入toast
        function clearTimer(){
             if(timer.value)
                clearTimeout(timer.value)
        }
        // 鼠标移出toast
        function createTimer(){
           if(props.autoClose){
                timer.value = setTimeout(() => {
                    visible.value = false
                }, props.autoClose)
            }
        }

        // 销毁
        function destruction(){
            visible.value = false
        }

        onMounted(()=>{
            createTimer();
        })

        onBeforeUnmount(()=>{
            if(timer.value)
                clearTimeout(timer.value)
        })


        return {
            visible,
            container,
            height,
            toastPosition,
            toastStyle,
            id,
            afterLeave,
            afterEnter,
            timer,
            clearTimer,
            createTimer,
            destruction
        }
    }
}
</script>
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我们来分析一下 instance.js 中 toast 关闭时的逻辑

1. 将此 toast 从存活数组中删除, 并且遍历数组将从此条开始后面的 toast 位置向上位移.
2. 从 <body> 中删除Dom元素.
3. 调用 unmount() 销毁实例.

// instance.js
import { createApp } from 'vue';
import Toasts from './toasts'
import Bus from './toastsBus'

let instances = []
let seed = 1

const toasts = (options) => {
    // 手动挂载实例
    let ToastsConstructor = createApp(Toasts, options)
    let instance = ToastsConstructor.mount(root)
    // 给实例加入唯一标识符
    instance.id = id
    // 显示实例
    instance.visible = true

    ...

    // 监听 toasts.vue 传来关闭事件
    Bus.$on('closed', (id) => {
        // 因为这里会监听到所有的 ‘closed’ 事件, 所以要匹配 id 确保
        if (instance.id == id) {
            // 调用删除逻辑
            removeInstance(instance)
            // 在 <body> 上删除dom元素
            document.body.removeChild(root)
            // 销毁实例
            ToastsConstructor.unmount();
        }
    })

    instances.push(instance)
    return instance
}

export default toasts;

// 删除逻辑
const removeInstance = (instance) => {
    if (!instance) return
    let len = instances.length
    // 找出当前需要销毁的下标
    const index = instances.findIndex(item => {
        return item.id === instance.id
    })
    // 从数组中删除
    instances.splice(index, 1)
    // 如果当前数组中还存在存活 Toasts, 需要遍历将下面的Toasts上移, 重新计算位移
    if (len <= 1) return
    // 获取被删除实例的高度
    const h = instance.height
    // 遍历被删除实例以后下标的 Toasts
    for (let i = index; i < len - 1; i++) {
        // 公式: 存活的实例将本身的 y 轴偏移量减去被删除高度及其间隙高度
        instances[i].toastPosition.y = parseInt(instances[i].toastPosition.y - h - 16)
    }
}
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完整代码

index.js

import toast from './instance'
import Toast from './toasts.vue'

export default (app) => {
    app.component(Toast.name, Toast);
    app.config.globalProperties.$Toast = toast;
}
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toastsBus.js

import emitter from 'tiny-emitter/instance'

export default {
    $on: (...args) => emitter.on(...args),
    $once: (...args) => emitter.once(...args),
    $off: (...args) => emitter.off(...args),
    $emit: (...args) => emitter.emit(...args)
}
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instance.js

import { createApp } from 'vue';
import Toasts from './toasts'
import Bus from './toastsBus'

let instances = []
let seed = 1

const toasts = (options) => {
    // 创建父容器
    const id = `toasts_${seed++}`
    let root = document.createElement('div');
    root.setAttribute('data-id', id)
    document.body.appendChild(root)
    let ToastsConstructor = createApp(Toasts, options)
    let instance = ToastsConstructor.mount(root)
    instance.id = id
    instance.visible = true
        // 重制高度
    let verticalOffset = 0
    instances.forEach(item => {
        verticalOffset += item.$el.offsetHeight + 16
    })
    verticalOffset += 16

    instance.toastPosition.y = verticalOffset

    Bus.$on('closed', (id) => {
        if (instance.id == id) {
            removeInstance(instance)
            document.body.removeChild(root)
            ToastsConstructor.unmount();
        }
    })
    instances.push(instance)
    return instance
}

export default toasts;

const removeInstance = (instance) => {
    if (!instance) return
    let len = instances.length
    const index = instances.findIndex(item => {
        return item.id === instance.id
    })
    instances.splice(index, 1)
    if (len <= 1) return
    const h = instance.height
    for (let i = index; i < len - 1; i++) {
        instances[i].toastPosition.y = parseInt(instances[i].toastPosition.y - h - 16)
    }
}
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toasts.vue

加入亿点点细节, 例如icon可以自定义或者是图片, 可以取消关闭按钮, 设置自动关闭时长, 或者停用自动关闭功能.

<template>
<transition name="toast" @after-leave="afterLeave" @after-enter="afterEnter">
  <!-- 弹窗 -->
  <div ref="container" class="toast-container" :style="toastStyle" v-show="visible" @mouseenter="clearTimer" @mouseleave="createTimer">
    <!-- icon -->
    <template v-if="type || type != 'custom' || type != 'img'">
        <div class="toast-icon success" v-if="type==='success'">
            <i class="fi fi-br-check"></i>
        </div>
        <div class="toast-icon warning" v-if="type==='warning'">
            ?
        </div>
        <div class="toast-icon info" v-if="type==='info'">
            <i class="fi fi-sr-bell-ring"></i>
        </div>
        <div class="toast-icon error" v-if="type==='error'">
            <i class="fi fi-br-cross-small"></i>
        </div>
    </template>
    <div :style="{'backgroundColor': customIconBackground}" class="toast-icon" v-if="type==='custom'" v-html="customIcon"></div>
    <img class="toast-custom-img" :src="customImg" v-if="type==='img'"/>
    <!-- content -->
    <div class="toast-content">
        <!-- head -->
        <div class="toast-head" v-if="title">
            <!-- title -->
            <span class="toast-title">{{title}}</span>
            <!-- time -->
            <span class="toast-countdown">{{countDown}}</span>
        </div>
        <!-- body -->
        <div class="toast-body" v-if="message" v-html="message"></div>
        <!-- operate -->
        <div class="toast-operate" v-if="confirmHandle">
            <a class="toast-button-confirm" 
               :class="[{'success':type==='success'},
                        {'warning':type==='warning'},
                        {'info':type==='info'},
                        {'error':type==='error'}]"
                        @click="confirmHandle">{{confirmText}}</a>
        </div>
    </div>
    <!-- 关闭 -->
    <div v-if="closeIcon" class="toast-close"  @click="destruction">
        <i class="fi fi-rr-cross-small"></i>
    </div>
  </div>
  </transition>
</template>

<script>
import Bus from './toastsBus'
import {ref, computed, onMounted, onBeforeUnmount} from 'vue'
export default {
    props: {
        title: String,
        closeIcon: {
            type: Boolean,
            default: true
        },
        message: String,
        type: {
            type: String,
            validator: function(val) {
                return ['success', 'warning', 'info', 'error', 'custom', 'img'].includes(val);
            }
        },
        confirmText: String,
        customIcon: String,
        customIconBackground: String,
        customImg: String,
        autoClose: {
            type: Number,
            default: 4500
        },
        confirmHandle: Function,
        leaveHandle: Function
    },
    setup(props){
        // 显示
        const visible = ref(false);

        // 容器实例
        const container = ref(null);

        // 高度
        const height = ref(0);

        // 位置
        const toastPosition = ref({
            x: 16,
            y: 16
        })
        const toastStyle = computed(()=>{
            return {
                top: `${toastPosition.value.y}px`,
                right: `${toastPosition.value.x}px`,
            }
        })

        // 倒计时
        const countDown = computed(()=>{
            return '2 seconds ago'
        })

        const id = ref('')

        // 离开以后
        function afterLeave(){
            Bus.$emit('closed',id.value);
            if(props.leaveHandle)
                props.leaveHandle()
        }
        // 进入以后
        function afterEnter(){
            height.value = container.value.offsetHeight
        }

        // 定时器
        const timer = ref(null);

        // 鼠标进入
        function clearTimer(){
             if(timer.value)
                clearTimeout(timer.value)
        }
        // 鼠标移出
        function createTimer(){
           if(props.autoClose){
                timer.value = setTimeout(() => {
                    visible.value = false
                }, props.autoClose)
            }
        }

        // 销毁
        function destruction(){
            visible.value = false
        }

        // 主动关闭
        function close(){
            destruction();
        }

        onMounted(()=>{
            createTimer();
        })

        onBeforeUnmount(()=>{
            if(timer.value)
                clearTimeout(timer.value)
        })

        return {
            visible,
            toastPosition,
            toastStyle,
            countDown,
            afterLeave,
            afterEnter,
            clearTimer,
            createTimer,
            timer,
            destruction,
            container,
            height,
            id
        }
    }
}
</script>

<style lang="scss" scoped>
// 外部容器
.toast-container{
    width: 330px;
    box-shadow: rgba(0, 0, 0, 0.1) 0px 2px 12px 0px;
    background-color: rgba(#F7F7F7, .6);
    border: 1px solid #E5E5E5;
    padding: 14px 13px;
    z-index: 1001;
    position: fixed;
    top: 0;
    right: 0;
    border-radius: 10px;
    backdrop-filter: blur(15px);
    display: flex;
    align-items: stretch;
    transition: all .3s ease;
    will-change: top,left;
}
// -------------- icon --------------
.toast-icon, .toast-close{
    flex-shrink: 0;
}
.toast-icon{
    width: 30px;
    height: 30px;
    border-radius: 100%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
// 正确
.toast-icon.success{
    background-color: rgba(#2BB44A, .15);
    color: #2BB44A;
}
// 异常
.toast-icon.warning{
    background-color: rgba(#ffcc00, .15);
    color: #F89E23;
    font-weight: 600;
    font-size: 18px;
}
// 错误
.toast-icon.error{
    font-size: 18px;
    background-color: rgba(#EB2833, .1);
    color: #EB2833;
}
// 信息
.toast-icon.info{
    background-color: rgba(#3E71F3, .1);
    color: #3E71F3;
}
// 自定义图片
.toast-custom-img{
    width: 40px;
    height: 40px;
    border-radius: 10px;
    overflow: hidden;
    flex-shrink: 0;
}
// ------------- content -----------
.toast-content{
    padding: 0 8px 0 13px;
    flex: 1;
}
// -------------- head --------------
.toast-head{
    display: flex;
    align-items: center;
    justify-content: space-between;
}
// title
.toast-title{
    font-size: 16px;
    line-height: 24px;
    color: #191919;
    font-weight: 600;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
// time
.toast-countdown{
    font-size: 12px;
    color: #929292;
    line-height: 18.375px;
}
// --------------- body -----------
.toast-body{
    color: #191919;
    line-height: 21px;
    padding-top: 5px;
}
// ---------- close -------
.toast-close{
    padding: 3px;
    cursor: pointer;
    font-size: 18px;
    width: 24px;
    height: 24px;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.toast-close:hover{
    background-color: rgba(#E4E4E4, .5);
}
// --------- operate ----------
.toast-button-confirm{
    font-weight: 600;
    color: #3E71F3;
}
.toast-button-confirm:hover{
    color: #345ec9;
}
// 成功
.toast-button-confirm.success{
    color: #2BB44A;
}
.toast-button-confirm.success:hover{
    color: #218a3a;
}
// 异常
.toast-button-confirm.warning{
    color: #F89E23;
}
.toast-button-confirm.warning:hover{
    color: #df8f1f;
}
// 信息
.toast-button-confirm.info{
    color: #3E71F3;
}
.toast-button-confirm.info:hover{
    color: #345ec9;
}
// 错误
.toast-button-confirm.error{
    color: #EB2833;
}
.toast-button-confirm.error:hover{
    color: #c9101a;
}


/*动画*/
.toast-enter-from,
.toast-leave-to{
  transform: translateX(120%);
}
.v-leave-from,
.toast-enter-to{
  transform: translateX(00%);
}
</style>
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main.js

import { createApp } from 'vue'
import App from './App.vue'

const app = createApp(App)

import '@/assets/font/UIcons/font.css'

// 安装toasts
import toasts from './components/toasts'

app.use(toasts).mount('#app')
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使用

<template>
    <button @click="clickHandle">发送</button>
    <button @click="closeHandle">主动关闭</button>
</template>

<script>
import { getCurrentInstance } from 'vue'
export default {
  setup(){
    const instance = getCurrentInstance()
    let toast

    function clickHandle(){
      // 这里调用 vue3 的全局变量时比较羞耻, 不知道各位大佬有没有其他好办法
      toast = instance.appContext.config.globalProperties.$Toast({
        type: 'info',
        title: '这是一句标题',
        message: '本文就是梳理mount函数的主要逻辑，旨在理清基本的处理流程（Vue 3.1.1版本）。',
        autoClose: 10000,
        confirmText: '已阅读',
        confirmHandle: () => {
           alert('阅读完成!')
        },
        leaveHandle: () => {
           alert('Toasts 离开了')
        }
      })
    }

    // 主动关闭
    fucntion closeHandle(){
        if(toast)
            toast.close();
    }

    return {
      clickHandle,
      closeHandle
    }
  }
}
</script>
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Toasts 属性

Toasts 事件

icon图标字体获取

www.flaticon.com/[1]

本文由哈喽比特于3年以前收录，如有侵权请联系我们。
文章来源：https://mp.weixin.qq.com/s/KOuCsCOpqXBnP6lBh3-KfQ