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Excel 的导入导出

Excel 的导入导出

安装依赖

npm install xlsx file-saver -S
npm install script-loader -S -D

导出 excel（下载）

封装 Export2Excel.js 方便导出数据

/* 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}`
  );
}

使用示例（导入时使用懒加载）

<script>
    handleDownload() {
      this.downloadLoading = true
      import('@/vendor/Export2Excel').then((excel) => {
        const tHeader = ['Id', 'Title', 'Author', 'Readings', 'Date']
        const filterVal = ['id', 'title', 'author', 'pageviews', 'display_time']
        const list = this.list   //Array<Object> 对象数组
        const data = this.formatJson(filterVal, list)//对象里面的属性值  对象数组
        excel.export_json_to_excel({
          header: tHeader,
          data,
          filename: this.filename,
          autoWidth: this.autoWidth,
          bookType: this.bookType
        })
        this.downloadLoading = false
      })
    },
    formatJson(filterVal, jsonData) {
      return jsonData.map((v) => filterVal.map((j) => v[j]))
    }
    //如果需要格式化时间  parseTime需要从工具方法中导入
    formatJson(filterVal, jsonData) {
      return jsonData.map((v) =>
        filterVal.map((j) => {
          if (j === 'timestamp') {
            return parseTime(v[j])
          } else {
            return v[j]
          }
        })
      )
    }
</script>

data 的数据格式

导入 excel（上传）

封装 UploadExcel 导入组件

支持点击和拖拽上传,它提供了两个回调函数：

  • 你可以在上传之前做一些自己的特殊判断，如判断文件的大小是否大于 1 兆？若大于 1 兆则停止解析并提示错误信息。
  • onSuccess 解析成功时候会触发的回调函数，它会返回表格的表头和内容。
<template>
   
  <div>
       
    <input
      ref="excel-upload-input"
      class="excel-upload-input"
      type="file"
      accept=".xlsx, .xls"
      @change="handleClick"
    />
       
    <div class="drop" @drop="handleDrop" @dragover="handleDragover" @dragenter="handleDragover">
            Drop excel file here or      
      <el-button
        :loading="loading"
        style="margin-left:16px;"
        size="mini"
        type="primary"
        @click="handleUpload"
      >
                Browse      
      </el-button>
         
    </div>
     
  </div>
</template>

<script>
import XLSX from "xlsx";
export default {
  props: {
    beforeUpload: Function, // eslint-disable-line
    onSuccess: Function // eslint-disable-line
  },
  data() {
    return {
      loading: false,
      excelData: {
        header: null,
        results: null
      }
    };
  },
  methods: {
    generateData({ header, results }) {
      this.excelData.header = header;
      this.excelData.results = results;
      this.onSuccess && this.onSuccess(this.excelData);
    },
    handleDrop(e) {
      e.stopPropagation();
      e.preventDefault();
      if (this.loading) return;
      const files = e.dataTransfer.files;
      if (files.length !== 1) {
        this.$message.error("Only support uploading one file!");
        return;
      }
      const rawFile = files[0]; // only use files[0]
      if (!this.isExcel(rawFile)) {
        this.$message.error("Only supports upload .xlsx, .xls, .csv suffix files");
        return false;
      }
      this.upload(rawFile);
      e.stopPropagation();
      e.preventDefault();
    },
    handleDragover(e) {
      e.stopPropagation();
      e.preventDefault();
      e.dataTransfer.dropEffect = "copy";
    },
    handleUpload() {
      this.$refs["excel-upload-input"].click();
    },
    handleClick(e) {
      const files = e.target.files;
      const rawFile = files[0]; // only use files[0]
      if (!rawFile) return;
      this.upload(rawFile);
    },
    upload(rawFile) {
      this.$refs["excel-upload-input"].value = null; // fix can't select the same excel
      if (!this.beforeUpload) {
        this.readerData(rawFile);
        return;
      }
      const before = this.beforeUpload(rawFile);
      if (before) {
        this.readerData(rawFile);
      }
    },
    readerData(rawFile) {
      this.loading = true;
      return new Promise((resolve, reject) => {
        const reader = new FileReader();
        reader.onload = e => {
          const data = e.target.result;
          const workbook = XLSX.read(data, { type: "array" });
          const firstSheetName = workbook.SheetNames[0];
          const worksheet = workbook.Sheets[firstSheetName];
          const header = this.getHeaderRow(worksheet);
          const results = XLSX.utils.sheet_to_json(worksheet);
          this.generateData({ header, results });
          this.loading = false;
          resolve();
        };
        reader.readAsArrayBuffer(rawFile);
      });
    },
    getHeaderRow(sheet) {
      const headers = [];
      const range = XLSX.utils.decode_range(sheet["!ref"]);
      let C;
      const R = range.s.r; /* start in the first row */
      for (C = range.s.c; C <= range.e.c; ++C) {
        /* walk every column in the range */
        const cell =
          sheet[XLSX.utils.encode_cell({ c: C, r: R })]; /* find the cell in the first row */
        let hdr = "UNKNOWN " + C; // <-- replace with your desired default
        if (cell && cell.t) hdr = XLSX.utils.format_cell(cell);
        headers.push(hdr);
      }
      return headers;
    },
    isExcel(file) {
      return /\.(xlsx|xls|csv)$/.test(file.name);
    }
  }
};
</script>
<style scoped>
.excel-upload-input{
  display: none;
  z-index: -9999;
}
.drop{
  border: 2px dashed #bbb;
  width: 600px;
  height: 160px;
  line-height: 160px;
  margin: 0 auto;
  font-size: 24px;
  border-radius: 5px;
  text-align: center;
  color: #bbb;
  position: relative;
}
</style>

使用示例

<template>
   
  <div class="app-container">
       
    <upload-excel-component
      :on-success="handleSuccess"
      :before-upload="beforeUpload"
    />
       
    <el-table
      :data="tableData"
      border
      highlight-current-row
      style="width: 100%;margin-top:20px;"
    >
           
      <el-table-column
        v-for="item of tableHeader"
        :key="item"
        :prop="item"
        :label="item"
      />
         
    </el-table>
     
  </div>
</template>

<script>
import UploadExcelComponent from "@/components/UploadExcel/index.vue";
export default {
  name: "UploadExcel",
  components: { UploadExcelComponent },
  data() {
    return {
      tableData: [],
      tableHeader: []
    };
  },
  methods: {
    beforeUpload(file) {
      const isLt1M = file.size / 1024 / 1024 < 1;
      if (isLt1M) {
        return true;
      }
      this.$message({
        message: "Please do not upload files larger than 1m in size.",
        type: "warning"
      });
      return false;
    },
    //onSuccess解析成功时候会触发的回调函数，它会返回表格的表头和内容
    handleSuccess({ results, header }) {
      this.tableData = results;
      this.tableHeader = header;
    }
  }
};
</>

Zip 的导出

封装 Export2Zip.js 导出 Zip

/_ eslint-disable _/;
import { saveAs } from "file-saver";
import JSZip from "jszip";
export function export_txt_to_zip(th, jsonData, txtName, zipName) {
  const zip = new JSZip();
  const txt_name = txtName || "file";
  const zip_name = zipName || "file";
  const data = jsonData;
  let txtData = `${th}\r\n`;
  data.forEach(row => {
    let tempStr = "";
    tempStr = row.toString();
    txtData += `${tempStr}\r\n`;
  });
  zip.file(`${txt_name}.txt`, txtData);
  zip
    .generateAsync({
      type: "blob"
    })
    .then(
      blob => {
        saveAs(blob, `${zip_name}.zip`);
      },
      err => {
        alert("导出失败");
      }
    );
}

使用示例

<script>
  handleDownload() {
    this.downloadLoading = true
    import('@/vendor/Export2Zip').then(zip => {
      const tHeader = ['Id', 'Title', 'Author', 'Readings', 'Date']
      const filterVal = ['id', 'title', 'author', 'pageviews', 'display_time']
      const list = this.list
      const data = this.formatJson(filterVal, list)
//导出的压缩包里面包含一个 txt 文件，第三个参数是 txt 文件名，第四个是 zip 文件名
      zip.export_txt_to_zip(tHeader, data, "txtName", "zipName")
      this.downloadLoading = false
    })
  },
formatJson(filterVal, jsonData) {
      return jsonData.map((v) => filterVal.map((j) => v[j]))
   }
//如果需要格式化时间 parseTime 需要从工具方法中导入
  formatJson(filterVal, jsonData) {
      return jsonData.map((v) =>
      filterVal.map((j) => {
         if (j === 'timestamp') {
           return parseTime(v[j])
         } else {
          return v[j]
         }
       })
     )
   }
</script>

PDF

window.print(); //打印当前网页

tinyMCE 富文本

Pagination