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产品首页 在线 Demo 产品文档 API 参考 技术社区
立即试用
(Showing Draft Content)

一次导入多个文件

需求：用户希望选取多个文件并在页面展示，但是通过循环获取会报错

在实际项目中，用户一次会上传多个文件，需要利用SpreadJS依次去读取每一个文件中的特定内容。

这时，大部分用户第一反应会这么写：

window.onload = () => {
  var spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"), {
    sheetCount: 1,
  });
  let excelio = new GC.Spread.Excel.IO();
  document.getElementById("upload").onclick = () => {
    getFiles();
  };

  getFiles = () => {
    let files = document.getElementById("file").files;
    Array.from(files).forEach((ele, index) => {
      openFile(ele, index);
    });
  };

  openFile = (file, index) => {
    excelio.open(file, (json) => {
      spread.fromJSON(json);
    });
    console.log(`open${index}`);
  };
};

但这个时候执行代码，发现只能读到第一个文件，接着就会报错。

这是因为excelio的open方法其实是一个异步的过程，在循环中用同一个excelio打开不同的文件，有可能上一步的异步操作还没有执行完成。

实现思路

如果要使用同一个excelio打开不同的文件，则需要将打开下一个文件的操作写在上一个excelio执行成功后的回调函数中。

但这样书写其实是比较麻烦的，因此我们可以考虑使用不同的excelio去打开不同的文档，只要将创建excelio的代码写在openFile函数中即可。

调整完成后的代码为：

window.onload = () => {
  var spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"), {
    sheetCount: 1,
  });
  document.getElementById("upload").onclick = () => {
    getFiles();
  };
  getFiles = () => {
    let files = document.getElementById("file").files;
    Array.from(files).forEach((ele, index) => {
      openFile(ele, index);
    });
  };
  openFile = (file, index) => {
    let excelio = new GC.Spread.Excel.IO();
    excelio.open(file, (json) => {
      spread.fromJSON(json);
    });
    console.log(`open${index}`);
  };
};

完整demo请见论坛精华帖：SpreadJS 依次读取多文件

作者: GrapeCity China | 审核：AlexZ | 更新时间：2023.09.27