后台系统使用导出Excel组件

后台系统使用导出Excel组件

最后修改时间:7 months ago

# 描述

最近在做后台项目中遇到要导出Excel的功能,这个功能当时特别紧急,几乎就是做完老板要用,所以慌的嘞,做完就赶紧复盘记录。

# 实战例子

1.首先需要在项目的src目录中的components文件夹下创建导出的子组件ExportExcel.vue

<template>
  <div>
    <el-button :loading="downloadLoading" type="primary" @click="handleDownload"
      >导出</el-button
    >
  </div>
</template>

<script>
export default {
  name: "ExportExcel",
  props: {
    list: {
      required: true,
      type: Array,
    },
    tHeader: {
      required: true,
      type: Array,
    },
    tValue: {
      required: true,
      type: Array,
    },
    filename: {
      type: String,
      default: "导出数据",
    },
  },
  data() {
    return {
      downloadLoading: false,
      autoWidth: true,
      bookType: "xlsx",
    };
  },
  methods: {
    handleDownload() {
      this.downloadLoading = true;
      import("@/vendor/Export2Excel").then((excel) => {
        const data = this.formatJson(this.tValue, this.list);
        excel.export_json_to_excel({
          header: this.tHeader,
          data,
          filename: this.filename,
          autoWidth: this.autoWidth,
          bookType: this.bookType,
        });
        this.downloadLoading = false;
      });
    },
    formatJson(filterVal, jsonData) {
      return jsonData.map((v) =>
        filterVal.map((j) => {
          return v[j];
        })
      );
    },
  },
};
</script>

<style scoped>
.el-button {
  width: 70px;
  height: 40px;
  padding: 0;
  margin: 0;
  text-align: center;
  background-color: #ffffff;
  color: #606266;
  border: 1px solid #dcdfe6;
}
.el-button:hover {
  background-color: #ecf5ff;
  color: #409eff;
}
</style>

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79

它需要引用@/vendor/Export2Excel

2.在src目录下创建vendor目录并创建Export2Excel.js

/* eslint-disable */
import { saveAs } from 'file-saver'
import XLSX from 'xlsx'

function generateArray(table) {
  var out = [];
  var rows = table.querySelectorAll('tr');
  var ranges = [];
  for (var R = 0; R < rows.length; ++R) {
    var outRow = [];
    var row = rows[R];
    var columns = row.querySelectorAll('td');
    for (var C = 0; C < columns.length; ++C) {
      var cell = columns[C];
      var colspan = cell.getAttribute('colspan');
      var rowspan = cell.getAttribute('rowspan');
      var cellValue = cell.innerText;
      if (cellValue !== "" && cellValue == +cellValue) cellValue = +cellValue;

      //Skip ranges
      ranges.forEach(function (range) {
        if (R >= range.s.r && R <= range.e.r && outRow.length >= range.s.c && outRow.length <= range.e.c) {
          for (var i = 0; i <= range.e.c - range.s.c; ++i) outRow.push(null);
        }
      });

      //Handle Row Span
      if (rowspan || colspan) {
        rowspan = rowspan || 1;
        colspan = colspan || 1;
        ranges.push({
          s: {
            r: R,
            c: outRow.length
          },
          e: {
            r: R + rowspan - 1,
            c: outRow.length + colspan - 1
          }
        });
      };

      //Handle Value
      outRow.push(cellValue !== "" ? cellValue : null);

      //Handle Colspan
      if (colspan)
        for (var k = 0; k < colspan - 1; ++k) outRow.push(null);
    }
    out.push(outRow);
  }
  return [out, ranges];
};

function datenum(v, date1904) {
  if (date1904) v += 1462;
  var epoch = Date.parse(v);
  return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000);
}

function sheet_from_array_of_arrays(data, opts) {
  var ws = {};
  var range = {
    s: {
      c: 10000000,
      r: 10000000
    },
    e: {
      c: 0,
      r: 0
    }
  };
  for (var R = 0; R != data.length; ++R) {
    for (var C = 0; C != data[R].length; ++C) {
      if (range.s.r > R) range.s.r = R;
      if (range.s.c > C) range.s.c = C;
      if (range.e.r < R) range.e.r = R;
      if (range.e.c < C) range.e.c = C;
      var cell = {
        v: data[R][C]
      };
      if (cell.v == null) continue;
      var cell_ref = XLSX.utils.encode_cell({
        c: C,
        r: R
      });

      if (typeof cell.v === 'number') cell.t = 'n';
      else if (typeof cell.v === 'boolean') cell.t = 'b';
      else if (cell.v instanceof Date) {
        cell.t = 'n';
        cell.z = XLSX.SSF._table[14];
        cell.v = datenum(cell.v);
      } else cell.t = 's';

      ws[cell_ref] = cell;
    }
  }
  if (range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range);
  return ws;
}

function Workbook() {
  if (!(this instanceof Workbook)) return new Workbook();
  this.SheetNames = [];
  this.Sheets = {};
}

function s2ab(s) {
  var buf = new ArrayBuffer(s.length);
  var view = new Uint8Array(buf);
  for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
  return buf;
}

export function export_table_to_excel(id) {
  var theTable = document.getElementById(id);
  var oo = generateArray(theTable);
  var ranges = oo[1];

  /* original data */
  var data = oo[0];
  var ws_name = "SheetJS";

  var wb = new Workbook(),
    ws = sheet_from_array_of_arrays(data);

  /* add ranges to worksheet */
  // ws['!cols'] = ['apple', 'banan'];
  ws['!merges'] = ranges;

  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name);
  wb.Sheets[ws_name] = ws;

  var wbout = XLSX.write(wb, {
    bookType: 'xlsx',
    bookSST: false,
    type: 'binary'
  });

  saveAs(new Blob([s2ab(wbout)], {
    type: "application/octet-stream"
  }), "test.xlsx")
}

export function export_json_to_excel({
  multiHeader = [],
  header,
  data,
  filename,
  merges = [],
  autoWidth = true,
  bookType = 'xlsx'
} = {}) {
  /* original data */
  filename = filename || 'excel-list'
  data = [...data]
  data.unshift(header);

  for (let i = multiHeader.length - 1; i > -1; i--) {
    data.unshift(multiHeader[i])
  }

  var ws_name = "SheetJS";
  var wb = new Workbook(),
    ws = sheet_from_array_of_arrays(data);

  if (merges.length > 0) {
    if (!ws['!merges']) ws['!merges'] = [];
    merges.forEach(item => {
      ws['!merges'].push(XLSX.utils.decode_range(item))
    })
  }

  if (autoWidth) {
    /*设置worksheet每列的最大宽度*/
    const colWidth = data.map(row => row.map(val => {
      /*先判断是否为null/undefined*/
      if (val == null) {
        return {
          'wch': 10
        };
      }
      /*再判断是否为中文*/
      else if (val.toString().charCodeAt(0) > 255) {
        return {
          'wch': val.toString().length * 2
        };
      } else {
        return {
          'wch': val.toString().length
        };
      }
    }))
    /*以第一行为初始值*/
    let result = colWidth[0];
    for (let i = 1; i < colWidth.length; i++) {
      for (let j = 0; j < colWidth[i].length; j++) {
        if (result[j]['wch'] < colWidth[i][j]['wch']) {
          result[j]['wch'] = colWidth[i][j]['wch'];
        }
      }
    }
    ws['!cols'] = result;
  }

  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name);
  wb.Sheets[ws_name] = ws;

  var wbout = XLSX.write(wb, {
    bookType: bookType,
    bookSST: false,
    type: 'binary'
  });
  saveAs(new Blob([s2ab(wbout)], {
    type: "application/octet-stream"
  }), `${filename}.${bookType}`);
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221

3.在需要导出成Excel的页面中导入组件

import ExportExcel from "../../components/ExportExcel"
1
components: { ExportExcel },
1

在methods中还要定义两个方法分别关于调用下载函数和定义表格格式

    //导出下载表格
    handleDownload() {
      this.downloadLoading = true
      import("@/vendor/Export2Excel").then((excel) => {
        const data = this.formatJson(filterVal)
        excel.export_json_to_excel({
          header: tHeader,
          data,
          filename: "table-list",
        })
        this.downloadLoading = false
      })
    },
    //定义导出表格的格式
    formatJson(filterVal) {
      return this.tableData.map((v) =>
        filterVal.map((j) => {
          if (j === "timestamp") {
            return parseTime(v[j])
          } else {
            return v[j]
          }
        })
      )
    },
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

最后在模板语法中使用

<export-excel

    v-if="exportList !== null"

    :list="exportList"

    :tHeader="tHeader"

    :tValue="tValue"

    filename="消毒灯后台管理系统_导出数据"

   \></export-excel>
1
2
3
4
5
6
7
8
9
10
11
12
13

:tHeader 是一个数组,它绑定的是自定义Excel的表头

在data中定义

tHeader:["序号","姓名","年龄"]
1

:tValue 是一个数组,它中绑定的是Excel每一列的值

tValue:["id","name","age"]
1

注意:tHeader和tValue数组中的值必须一一对应

v-if 中判断的是要导出的数据源是否存在

:list 中绑定的是要导出的数据源,注意数据源最好是用对象数组的形式且对象中的数据只有一层

例如:

exportList = [
  {
      id:1,
      name:"张三",
      age:"18"
  },
  {
      id:2,
      name:"李四",
      age:"21"
  },
  ……
]
1
2
3
4
5
6
7
8
9
10
11
12
13

而不能

exportList2 = [
  {
      id:1,
      name:"张三",
      age:"18",
      school:{
         schoolName:"XXX学校",
         ……
      }
  },
  {
      id:2,
      name:"李四",
      age:"21",
      school:{
         schoolName:"XXX学校",
         ……
      }
  },
  ……
]
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21

如果你如上定义exportList2那么你想要取schoolName就必须school.schoolName,这样是不能作为表格的值来显示的

filename 中给的值是导出表格的名字

以上就是用vue开发后台系统项目中如何创建导出功能的内容。

亲测有效,奔走相告!

- 全文完 -

留下一条留言?
默认颜色

主题颜色

标准颜色

更多颜色...