1.固定合并
官方挺提供的合并具体某行列的方法:el-table合并行或列
通过给table传入span-method方法可以实现合并行或列，方法的参数是一个对象，里面包含当前行row、当前列column、当前行号rowIndex、当前列号columnIndex四个属性。
该函数可以返回一个包含两个元素的数组，第一个元素代表rowspan，第二个元素代表colspan。 也可以返回一个键名为rowspan和colspan的对象。
<template>
<div>
<el-table
:data="tableData"
:span-method="arraySpanMethod"
border
style="width: 100%">
<el-table-column
prop="id"
label="ID"
width="180">
</el-table-column>
<el-table-column
prop="name"
label="姓名">
</el-table-column>
<el-table-column
prop="amount1"
sortable
label="数值 1">
</el-table-column>
<el-table-column
prop="amount2"
sortable
label="数值 2">
</el-table-column>
<el-table-column
prop="amount3"
sortable
label="数值 3">
</el-table-column>
</el-table>
<el-table
:data="tableData"
:span-method="objectSpanMethod"
border
style="width: 100%; margin-top: 20px">
<el-table-column
prop="id"
label="ID"
width="180">
</el-table-column>
<el-table-column
prop="name"
label="姓名">
</el-table-column>
<el-table-column
prop="amount1"
label="数值 1（元）">
</el-table-column>
<el-table-column
prop="amount2"
label="数值 2（元）">
</el-table-column>
<el-table-column
prop="amount3"
label="数值 3（元）">
</el-table-column>
</el-table>
</div>
</template>
<script>
export default {
data() {
return {
tableData: [{
id: '12987122',
name: '王小虎',
amount1: '234',
amount2: '3.2',
amount3: 10
}, {
id: '12987123',
name: '王小虎',
amount1: '165',
amount2: '4.43',
amount3: 12
}, {
id: '12987124',
name: '王小虎',
amount1: '324',
amount2: '1.9',
amount3: 9
}, {
id: '12987125',
name: '王小虎',
amount1: '621',
amount2: '2.2',
amount3: 17
}, {
id: '12987126',
name: '王小虎',
amount1: '539',
amount2: '4.1',
amount3: 15
}]
};
},
methods: {
arraySpanMethod({ row, column, rowIndex, columnIndex }) {
if (rowIndex % 2 === 0) {
if (columnIndex === 0) {
return [1, 2];
} else if (columnIndex === 1) {
return [0, 0];
}
}
},
objectSpanMethod({ row, column, rowIndex, columnIndex }) {
if (columnIndex === 0) {
if (rowIndex % 2 === 0) {
return {
rowspan: 2,
colspan: 1
};
} else {
return {
rowspan: 0,
colspan: 0
};
}
}
}
}
};
</script>
缺点：这种只适合写死的数据和固定的表格行列，无法动态判断单元格数据是否相等再合并；
2. 动态合并相同数据单元格（所有列）
可以对所有相同数据的列，进行动态合并
此方法适合需要合并所有的相同数据的单元格
<template>
<div>
<el-table
:data="tableData"
:span-method="objectSpanMethod"
border
:header-cell-style="{ textAlign: 'center', backgroundColor: '#F5F7FA' }"
>
<el-table-column prop="School" label="学校" align="center">
</el-table-column>
<el-table-column prop="Grade" label="年级" align="center" />
<el-table-column prop="Class" label="班级" align="center" />
<el-table-column prop="Name" label="姓名" align="center" />
<el-table-column prop="Chinese" label="语文" align="center" />
<el-table-column prop="Math" label="数学" align="center" />
<el-table-column prop="English" label="英语" align="center" />
</el-table>
</div>
</template>
<script>
export default {
data() {
return {
// 存放所有的表头 一定要与tableData一致
colFields: [
"School",
"Grade",
"Class",
"Name",
"Chinese",
"Math",
"English",
],
spanArr: [], //存储合并单元格的开始位置
// 表格数据
tableData: [
// 一年级
{
School: "第一小学",
Grade: "1年级",
Class: "1班",
Name: "张三",
Chinese: "90",
Math: "100",
English: "80",
},
{
School: "第一小学",
Grade: "1年级",
Class: "2班",
Name: "李四",
Chinese: "90",
Math: "85",
English: "80",
},
{
School: "第一小学",
Grade: "1年级",
Class: "3班",
Name: "王五",
Chinese: "79",
Math: "100",
English: "80",
},
// 二年级
{
School: "第一小学",
Grade: "2年级",
Class: "1班",
Name: "赵六",
Chinese: "95",
Math: "100",
English: "80",
},
{
School: "第一小学",
Grade: "2年级",
Class: "2班",
Name: "钱八",
Chinese: "98",
Math: "85",
English: "80",
},
{
School: "第一小学",
Grade: "2年级",
Class: "3班",
Name: "陈九",
Chinese: "79",
Math: "100",
English: "80",
},
// 三年级
{
School: "第一小学",
Grade: "3年级",
Class: "1班",
Name: "黄十",
Chinese: "91",
Math: "88",
English: "80",
},
{
School: "第一小学",
Grade: "3年级",
Class: "2班",
Name: "魏一",
Chinese: "90",
Math: "86",
English: "87",
},
{
School: "第一小学",
Grade: "3年级",
Class: "3班",
Name: "杨二",
Chinese: "79",
Math: "99",
English: "80",
},
],
};
},
methods: {
/**
* 分析每一列，找出相同的
* @param data
*/
getSpanArr() {
for (let i = 0; i < this.tableData.length; i++) {
let row = i;
// let col = i % this.colCount;
if (row === 0) {
// i 表示行 j表示列
for (let j = 0; j < this.colFields.length; j++) {
this.spanArr[i * this.colFields.length + j] = {
rowspan: 1,
colspan: 1,
};
}
} else {
for (let j = 0; j < this.colFields.length; j++) {
// 当前和上一次的一样
// 1. 合并所有列的相同数据单元格
if (
this.tableData[row][this.colFields[j]] ===
this.tableData[row - 1][this.colFields[j]]
) {
let beforeItem =
this.spanArr[(row - 1) * this.colFields.length + j];
this.spanArr[row * this.colFields.length + j] = {
rowspan: 1 + beforeItem.rowspan, // 合并几行
colspan: 1, // 合并几列,我这里只是跨行合并,不跨列合并,所以用的1
};
beforeItem.rowspan = 0;
beforeItem.colspan = 0;
} else {
// rowspan 和 colspan 都为1表格此单元格不合并
this.spanArr[row * this.colFields.length + j] = {
rowspan: 1,
colspan: 1,
};
}
}
}
}
// 对数据进行倒序
let stack = [];
for (let i = 0; i < this.colFields.length; i++) {
for (let j = 0; j < this.tableData.length; j++) {
// console.log("i=" + i + " j=" + j);
// i 表示列 j表示行
if (j === 0) {
if (this.spanArr[j * this.colFields.length + i].rowspan === 0) {
stack.push(this.spanArr[j * this.colFields.length + i]);
}
} else {
if (this.spanArr[j * this.colFields.length + i].rowspan === 0) {
stack.push(this.spanArr[j * this.colFields.length + i]);
} else {
stack.push(this.spanArr[j * this.colFields.length + i]);
while (stack.length > 0) {
let pop = stack.pop();
let len = stack.length;
this.spanArr[(j - len) * this.colFields.length + i] = pop;
}
}
}
}
}
// console.log(this.spanArr);
},
objectSpanMethod({ row, column, rowIndex, columnIndex }) {
// console.log(this.spanArr[rowIndex * this.colFields.length + columnIndex]);
return this.spanArr[rowIndex * this.colFields.length + columnIndex];
},
},
mounted() {
this.getSpanArr();
},
};
</script>
<style lang="scss" scoped></style>
3. 动态合并相同数据单元格（指定列）
只需要加个if判断即可指定要合并哪些列
// 这里只放了部分代码,除了加了个if,其他代码和上面的一样
getSpanArr() {
for (let i = 0; i < this.tableData.length; i++) {
let row = i;
// let col = i % this.colCount;
if (row === 0) {
// i 表示行 j表示列
for (let j = 0; j < this.colFields.length; j++) {
this.spanArr[i * this.colFields.length + j] = {
rowspan: 1,
colspan: 1,
};
}
} else {
for (let j = 0; j < this.colFields.length; j++) {
// 当前和上一次的一样
// 合并所有列的相同数据单元格
if (
this.colFields[j] == "School" ||
this.colFields[j] == "Grade" ||
this.colFields[j] == "Class"
) { // 指定合并哪些列
if (
this.tableData[row][this.colFields[j]] ===
this.tableData[row - 1][this.colFields[j]]
) {
let beforeItem =
this.spanArr[(row - 1) * this.colFields.length + j];
this.spanArr[row * this.colFields.length + j] = {
rowspan: 1 + beforeItem.rowspan,
colspan: 1,
};
beforeItem.rowspan = 0;
beforeItem.colspan = 0;
} else {
// rowspan 和 colspan 都为1表格此单元格不合并
this.spanArr[row * this.colFields.length + j] = {
rowspan: 1,
colspan: 1,
};
}
}
}
}
}
效果:这样就只合并了我们指定的那几列了
4. 动态合并相同数据单元格（指定列+合并条件）
按常理来说，不同小学的数据应该是不做合并才对，正确是这种：
这时候就需要加上一些自定义的合并条件了：
getSpanArr() {
for (let i = 0; i < this.tableData.length; i++) {
let row = i;
// let col = i % this.colCount;
if (row === 0) {
// i 表示行 j表示列
for (let j = 0; j < this.colFields.length; j++) {
this.spanArr[i * this.colFields.length + j] = {
rowspan: 1,
colspan: 1,
};
}
} else {
for (let j = 0; j < this.colFields.length; j++) {
// 当前和上一次的一样
// 合并所有列的相同数据单元格
if (
this.colFields[j] == "School" ||
this.colFields[j] == "Grade" ||
this.colFields[j] == "Class"
) { // 指定合并哪些列
if (
this.tableData[row]["School"] !==
this.tableData[row - 1]["School"]
) { // 哪些不合并:School不一样的,不合并
this.spanArr[row * this.colFields.length + j] = {
rowspan: 1,
colspan: 1,
};
} else if (
this.tableData[row][this.colFields[j]] ===
this.tableData[row - 1][this.colFields[j]]
) {
let beforeItem =
this.spanArr[(row - 1) * this.colFields.length + j];
this.spanArr[row * this.colFields.length + j] = {
rowspan: 1 + beforeItem.rowspan,// 合并几列
colspan: 1,// 合并几行
};
beforeItem.rowspan = 0;
beforeItem.colspan = 0;
} else {
// rowspan 和 colspan 都为1表格此单元格不合并
this.spanArr[row * this.colFields.length + j] = {
rowspan: 1,
colspan: 1,
};
}
}
}
}
}
// console.log(this.spanArr);
},
