Render函数实战-表格渲染
2019-07-10 本文已影响3人
alanwhy
直接贴代码，具体内容看代码内注释
index.html
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>可排序的表格</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div id="app" v-cloak>
<v-table :data="data" :columns="columns"></v-table>
<button @click="handleAddData">添加数据</button>
</div>
<script src="https://unpkg.com/vue/dist/vue.min.js"></script>
<script src="table.js"></script>
<script src="index.js"></script>
</body>
</html>
style.css
[v-cloak] {
display: none;
}
table {
width: 100%;
margin-bottom: 24px;
border-collapse: collapse;
border-spacing: 0;
empty-cells: show;
border: 1px solid #e9e9e9;
}
table th {
background: #f7f7f7;
color: #5c6b77;
font-weight: 600;
white-space: nowrap;
}
table td,
table th {
padding: 8px 16px;
border: 1px solid #e9e9e9;
}
table th a {
display: inline-block;
margin: 0 4px;
cursor: pointer;
}
table th a:on {
color: #3399ff;
}
table th a:hover {
color: #3399ff;
}
index.js 主要钩子函数
var app = new Vue({
el: "#app",
data: {
columns: [{
title: "姓名",
key: "name"
}, {
title: "年龄",
key: "age",
sortable: true
}, {
title: "出生日期",
key: "birthday",
sortable: true
}, {
title: "地址",
key: "address"
}],
data: [{
name: "王小明",
age: 18,
birthday: "1999-02-21",
address: "北京市朝阳区芍药居"
}, {
name: "张小刚",
age: 25,
birthday: "1992-01-23",
address: "北京市朝阳区芍药居"
}, {
name: "李小红",
age: 30,
birthday: "1987-11-10",
address: "北京市朝阳区芍药居"
}, {
name: "周小伟",
age: 26,
birthday: "1991-10-10",
address: "北京市朝阳区芍药居"
}]
},
methods: {
handleAddData() {
this.data.push({
name: "刘小天",
age: 19,
birthday: "1998-05-30",
address: "北京市东城区东直门"
})
}
},
})
table.js
Vue.component("vTable", {
props: {
columns: {
type: Array,
default: () => {
return [];
}
},
data: {
type: Array,
default: () => {
return []
}
}
},
data() {
return {
// 为了避免传入数据污染创建当前组件的数据
currentColumns: [],
currentData: []
}
},
methods: {
// 为表头添加索引以及当前的排序状态
makeColumns() {
this.currentColumns = this.columns.map((col, index) => {
col._sortType = "normal"
col._index = index
return col
})
},
// 为数据添加索引用于排序
makeData() {
this.currentData = this.data.map((row, index) => {
row._index = index
return row
})
},
// 升序
handleSortByAsc(index) {
var key = this.currentColumns[index].key
this.currentColumns.forEach(col => {
col._sortType = "normal"
})
this.currentColumns[index]._sortType = "asc"
this.currentData.sort((a, b) => {
return a[key] > b[key] ? 1 : -1
})
},
// 降序
handleSortByDesc(index) {
var key = this.currentColumns[index].key
this.currentColumns.forEach(col => {
col._sortType = "normal"
})
this.currentColumns[index]._sortType = "desc"
this.currentData.sort((a, b) => {
return a[key] < b[key] ? 1 : -1
})
}
},
watch: {
// 父级数据改变 对应的改变子组件的数据 并重新排列
data() {
this.makeData()
var sortedColumn = this.currentColumns.filter(col => {
return col._sortType !== "normal"
})
if (sortedColumn.length > 0) {
if (sortedColumn[0]._sortType === "asc") {
this.handleSortByAsc(sortedColumn[0]._index)
} else {
this.handleSortByDesc(sortedColumn[0]._index)
}
}
}
},
mounted() {
this.makeColumns()
this.makeData()
},
render(h) {
var _this = this
var ths = []
this.currentColumns.forEach((col, index) => {
// 判断字段是否可以排序
if (col.sortable) {
ths.push(h("th", [
h("span", col.title),
h("a", {
class: {
on: col._sortType === "asc"
},
on: {
click: () => {
_this.handleSortByAsc(index)
}
}
}, "↑"),
h("a", {
class: {
on: col._sortType === "desc"
},
on: {
click: () => {
_this.handleSortByDesc(index)
}
}
}, "↓")
]))
} else {
ths.push(h("th", col.title))
}
})
var trs = []
this.currentData.forEach((row) => {
var tds = []
_this.currentColumns.forEach(cell => {
tds.push(h("td", row[cell.key]))
})
trs.push(h("tr", tds))
})
return h('table', [
h("thead", [
h("tr", ths)
]),
h("tbody", trs)
])
},
})
代码原文：《Vue.js实战》-- 梁灏
github地址：https://github.com/alanwhy/vue_render
