# 组件开发思路
# u-table
# 用法
<!-- list.vue -->
<u-table :list="list">
<template slot-scope="{ row }">
<u-table-column label="ID">{{ row.id }}</u-table-column>
<u-table-column label="姓名">{{ row.name }}</u-table-column>
</template>
</u-table>
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# 大致代码
<!-- u-table.vue -->
<template>
<table class="u-table">
<template v-if="isLoading">
<u-icon name="loading" />
</template>
<template v-else>
<template v-if="list.length !== 0">
<thead>
<tr>
<th v-for="(column, index) in columns" :key="column.label">{{ column.label }}</th>
</tr>
</thead>
<tbody>
<tr v-for="(row, index) in list" :key="index" @click="rowItemClick(row, index, $event)" class="u-table-row">
<slot :row="row" :rowIndex="index" />
</tr>
</tbody>
</template>
<div v-else class="no-data">暂无数据</div>
</template>
</table>
</template>
<script>
export default {
name: 'u-table',
props: {
list: Array,
hasLoading: { type: Boolean, default: false }
},
data() {
return {
// 这个columns由<u-table-column />通过 this.$parent.column 进行生成
columns: [],
isLoading: this.hasLoading
}
},
watch: {
list() {
this.isLoading = false
}
}
}
</script>
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<!-- u-table-column -->
<template>
<td class="u-table-column"><slot></slot></td>
</template>
<script>
export default {
name: 'u-table-column',
props: {
label: String,
visible: { type: Boolean, default: true } /* 是否显示该列 */
},
created() {
if (this.visible && !this.$parent.columns.find(item => item.label === this.label)) {
this.$parent.columns.push(this)
}
}
}
</script>
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# 思路
核心要点:
- 父组件只需定义每个列的数据展示方式
- 动态列的渲染,在
<u-table-column>
组件内的created
钩子,往this.$parent.columns
动态添加列 - 通过 作用域插槽(slot-scope),使得插槽也能使用子组件的一些属性(比如:
row
) isLoading
在<u-table>
内根据list
值自动变化
# u-modal
# 用法
<!-- i-guide-modal -->
<template>
<u-modal :visible="modalVisible" title="使用帮助" @before-close="submit" @close="closeModal" okButton="" cancelButton="">
<div class="navigation">
<div v-for="(item, index) in navigas" :key="index" class="btn">
<span class="num">{{ index + 1 }}</span> {{ item.title }}
</div>
</div>
<u-icon :name="DOWNLOAD_URL.MARK_ENTITY_GIF"></u-icon>
</u-modal>
</template>
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# 大致代码
<template>
<div class="u-modal-wapper" v-if="currentVisible" @click="cancel()" @keydown.esc="cancel()">
<div class="u-modal" v-bind="$attrs" v-on="$listeners">
<div class="head">{{ title }}</div>
<div class="body">
<slot>{{ content }}</slot>
</div>
<div class="foot">
<u-button @click="cancel">{{ cancelButton }}</u-button>
<u-button @click="ok">{{ okButton }}</u-button>
</div>
<u-icon v-if="showClose" name="close" class="close" @click="cancel" />
</div>
</div>
</template>
<script>
import Vue from 'vue'
const ModalType = {
ALERT: 'alert'
}
const Modal = {
name: 'u-modal',
props: {
visible: { type: Boolean, default: false },
title: { type: String, default: '' },
content: String
},
data() {
return {
currentVisible: this.visible
}
},
watch: {
visible(visible) {
this.currentVisible = visible
}
},
mounted() {
document.body.appendChild(this.$el)
},
methods: {
ok() {
this.$emit('ok')
this.close(true)
},
cancel() {
this.$emit('cancel')
this.close(false)
},
close(ok) {
// 设定一个变量cancel用来标志:外面是否阻止“内部的弹窗关闭行为”
let cancel = false
// 发射`before-close`事件,并传递出去ok值、preventDefault方法(此时处于同步执行)
// 将“关闭弹窗的执行权”交给外面
this.$emit('before-close', {
ok,
preventDefault: () => (cancel = true)
})
// 外面阻止了“内部的弹窗关闭行为”
if (cancel) return
// 外面没有阻止“内部的弹窗关闭行为”
this.currentVisible = false
// 通过事件触发形式,修改父组件传来的props值:visible、close
this.$emit('update:visible', false)
this.$emit('close', {
ok
})
},
// 提供给vue实例,主动打开弹窗的open方法
open() {
if (!this.$el) this.$mount(document.createElement('div'))
this.currentVisible = true
this.$emit('update:visible', true)
}
}
}
Modal.alert = (content, title, okButton, cancelButton = '') =>
new Promise((resolve, reject) => {
const Ctor = Vue.component('u-modal')
if (!Ctor) return
const instance = new Ctor({
propsData: { content, title, okButton, cancelButton, type: ModalType.ALERT, showClose: false }
})
instance.$on('ok', () => resolve())
instance.open()
})
// 将带有“<u-modal>组件构造器”的Promise,挂载到Vue原型上,方便业务层调用
Vue.prototype.$alert = Modal.alert
export default Modal
</script>
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# 思路
核心要点:
- 一个蒙层
- 接收props值
visible
,“内部visible”依赖它 - “弹窗关闭行为”的控制权(
cancel
变量、before-close
事件当中的preventDefault(改变cancel)
) - 将带有
<u-modal>
组件构造器的Promise,挂载到Vue原型上
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