使用vue3+TS实现简易组件库的全过程
时间：2022-06-05 11:20:02|栏目：vue|点击： 次
前置
首先下载vue-cli，搭建我们的环境，vue-create-luckyUi，选择vue3和TypeScript 。在src目录下创建package作为组件目录。再安装bootstrap，用bootstrap里面的样式来完成我们的组件。
组件编写
dropdown
首先查看boorstrap文档，是这样用的
<div class="dropdown">
<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-expanded="false">
Dropdown button
</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
<a class="dropdown-item" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Action</a>
<a class="dropdown-item" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Another action</a>
<a class="dropdown-item" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Something else here</a>
</div>
</div>
首先那个button按钮就是我们dropdown按钮的内容，将这部分作为属性传入，而dropdown-menu的内容是作为dropdown-item的，明显这里不能固定写三个，这里就用插槽占位，再封装一个dropdown-item组件。
首先dropdown组件内容如下：
<template>
<div class="dropdown" ref="dropdownRef">
<a
href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow"
class="btn btn-outline-light my-2 dropdown-toggle"
@click.prevent="toggleOpen"
>
{{ title }}
</a>
<ul class="dropdown-menu" :style="{ display: 'block' }" v-if="isOpen">
<slot></slot>
</ul>
</div>
</template>
dropdown-item的内容就是：
<template>
<li
class="dropdown-option"
:class="{'is-disabled': disabled}"
>
<slot></slot>
</li>
</template>
<script lang="ts">
import { defineComponent } from 'vue'
export default defineComponent({
name: "DropdownItem",
props: {
disabled: {
type: Boolean,
default: false
}
}
})
</script>
<style>
.dropdown-option.is-disabled * {
color: #6c757d;
pointer-events: none;
background-color: transparent;
}
</style>
还要实现一个点击dropdown，dropdown-item会随之收起来的功能，这个比较简单，在dropdown上绑定一个点击事件来控制变量isOpen为true或者false，在加上v-if即可实现功能。接下来还要实现一个点击页面的其他地方也能实现dropdown-item收缩，这里有两个思路：
- 首先在document上添加一个click事件，一旦触发就设置isOpen为false，给dropdown也添加一个点击事件，加上一个事件修饰符stop来阻止事件冒泡，这样除了点击dropdown意外的任何地方，document都会触发点击事件。
- 第二个思路就是让事件冒泡到document，通过判断事件对象包不包括我们的目标对象，如果不包括说明点击的是页面的其他地方，就设置isOpen为false。这里用了到了组合式api，新建文件package/hooks/useClickOutside.ts，
import { ref, onMounted, onUnmounted, Ref } from 'vue'
const useClickOutside = (elementRef: Ref<null | HTMLElement>) => {
const isClickOutside = ref(false)
const handler = (e: MouseEvent) => {
if (elementRef.value) {
if (elementRef.value.contains(e.target as HTMLElement)) {
isClickOutside.value = false
} else {
isClickOutside.value = true
}
}
}
onMounted(() => {
document.addEventListener('click', handler)
})
onUnmounted(() => {
document.removeEventListener('click', handler)
})
return isClickOutside
}
export default useClickOutside
然后直接导入即可使用定义的useClickOutside函数。这里监听isClickOutside的状态来更改isOpen的状态。
import useClickOutside from "../hooks/useClickOutside";
...
const isClickOutside = useClickOutside(dropdownRef);
watch(isClickOutside, () => {
if (isOpen.value && isClickOutside.value) {
isOpen.value = false;
}
});
form
首先看下文档用法
<form>
<div class="form-group">
<label for="exampleInputEmail1">Email address</label>
<input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp">
<small id="emailHelp" class="form-text text-muted">We'll never share your email with anyone else.</small>
</div>
<div class="form-group">
<label for="exampleInputPassword1">Password</label>
<input type="password" class="form-control" id="exampleInputPassword1">
</div>
<div class="form-group form-check">
<input type="checkbox" class="form-check-input" id="exampleCheck1">
<label class="form-check-label" for="exampleCheck1">Check me out</label>
</div>
<button type="submit" class="btn btn-primary">Submit</button>
</form>
首先编写ValidateForm组件：
<template>
<form class="validate-form-container">
<slot name="default"></slot>
<div class="submit-area" @click.prevent="submitForm">
<slot name="submit">
<button type="submit" class="btn btn-primary">提交</button>
</slot>
</div>
</form>
</template>
<script lang="ts">
import { defineComponent, onUnmounted } from 'vue'
import mitt from 'mitt'
type ValidateFunc = () => boolean
export const emitter = mitt()
export default defineComponent({
emits: ['form-submit'],
setup(props, context) {
let funcArr: ValidateFunc[] = []
const submitForm = () => {
const result = funcArr.map(func => func()).every(result => result)
context.emit('form-submit', result)
}
const callback = (func?: ValidateFunc) => {
if (func) {
funcArr.push(func)
}
}
emitter.on('form-item-created', callback)
onUnmounted(() => {
emitter.off('form-item-created', callback)
funcArr = []
})
return {
submitForm
}
}
})
</script>
接着编写ValidateInput.vue组件：
<template>
<div class="validate-input-container pb-3">
<input
class="form-control"
:class="{'is-invalid': inputRef.error}"
@blur="validateInput"
v-model="inputRef.val"
v-bind="$attrs"
>
<span v-if="inputRef.error" class="invalid-feedback">{{inputRef.message}}</span>
</div>
</template>
<script lang="ts">
import { defineComponent, reactive, PropType, onMounted, computed } from 'vue'
import { emitter } from './ValidateForm.vue'
const emailReg = /^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$/
interface RuleProp {
type: 'required' | 'email' | 'custom';
message: string;
validator?: () => boolean;
}
export type RulesProp = RuleProp[]
export type TagType = 'input'
export default defineComponent({
props: {
rules: Array as PropType<RulesProp>,
modelValue: String,
tag: {
type: String as PropType<TagType>,
default: 'input'
}
},
inheritAttrs: false,
setup(props, context) {
const inputRef = reactive({
val: computed({
get: () => props.modelValue || '',
set: val => {
context.emit('update:modelValue', val)
}
}),
error: false,
message: ''
})
const validateInput = () => {
if (props.rules) {
const allPassed = props.rules.every(rule => {
let passed = true
inputRef.message = rule.message
switch (rule.type) {
case 'required':
passed = (inputRef.val.trim() !== '')
break
case 'email':
passed = emailReg.test(inputRef.val)
break
case 'custom':
passed = rule.validator ? rule.validator() : true
break
default:
break
}
return passed
})
inputRef.error = !allPassed
return allPassed
}
return true
}
onMounted(() => {
emitter.emit('form-item-created', validateInput)
})
return {
inputRef,
validateInput
}
}
})
</script>
这里核心的地方有两点：
- 自定义组件实现v-model，vue2中自定义组件实现v-mdel必须要绑定一个value属性和input事件，在input事件中将输入的值传递给value。在vue3中就需要绑定一个modelValue和update:modelValue事件
- 还有就是父子组件之间的传值问题，因为有插槽，没办法使用常规的属性传值，这里使用的事件传值采用了一个第三方库mitt。在父组件中通过emitter.on('form-item-created', callback)来注册事件，在子组件中通过emitter.emit('form-item-created', validateInput)触发事件。
验证
新建文件package/index.ts
import 'bootstrap/dist/css/bootstrap.min.css'
//导入组件
import Dropdown from "./Dropdown/Dropdown.vue";
import DropdownItem from "./Dropdown/DropdownItem.vue";
const components = [
Dropdown,
DropdownItem
]
const install = (Vue: any) => {
components.forEach((_: any) => {
Vue.component(_.name, _);
});
};
export default {
install
};
将写的组件依次导入，然后定义一个install函数，该函数有一个Vue实例的参数，在函数中依次遍历我们的导入组件数组，然后将组件挂载到vue实例上，导出install函数。
在根目录下的main.ts上使用我们的新组件：
import { createApp } from 'vue'
import App from './App.vue'
import luckyUi from './package/index';
const app = createApp(App)
app.use(luckyUi);
app.mount('#app')
在app.vue中进行测试：
<template>
<div>
<div class="dropdown">
<!-- 测试dropdown -->
<dropdown :title="`你好啊`">
<dropdown-item><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >王大</a> </dropdown-item>
<dropdown-item>
<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >王二</a>
</dropdown-item>
<dropdown-item disabled
><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="dropdown-item">王三</a></dropdown-item
>
<dropdown-item
><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="dropdown-item">王四</a></dropdown-item
>
</dropdown>
</div>
</div>
</template>
最后使用vue自带的脚手架进行打包，详细可看文档。
在package中配置打包命令：
"lib": "vue-cli-service build --target lib --name lucky-ui ./src/package/index.ts"
运行npm run lib即可在dist目录下查看。
总结
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本文标题：使用vue3+TS实现简易组件库的全过程
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