HTML and Excel interaction: detailed explanation of reading data

How to read Excel data in HTML: Use JavaScript FileReader API to load Excel files into FileReader. Convert the contents of an Excel file to a binary string. Use the XLSX library to parse the binary string to get the data for the first worksheet. Store worksheet data in JavaScript arrays. Use JavaScript to create a table and display data from an array.

HTML Interaction with Excel: Detailed explanation of reading data

Introduction

HTML Interaction with Excel can greatly improve the efficiency of data analysis and visualization. By embedding Excel data in HTML pages, we can create dynamic and interactive dashboards and charts. This article will introduce how to read Excel data in HTML and provide a practical case to illustrate its application.

Reading Excel data through JavaScript

The following code snippet shows how to use JavaScript to read Excel data:

function readExcelData(file) {
  // 将 Excel 文件加载到 FileReader 中
  var reader = new FileReader();
  reader.onload = function() {
    // 将 Excel 文件的内容转换为二进制字符串
    var data = reader.result;

    // 使用 XLSX 库解析二进制字符串
    var workbook = XLSX.read(data, {type: 'binary'});

    // 获取第一个工作表中的数据
    var worksheet = workbook.Sheets[workbook.SheetNames[0]];

    // 将工作表中所有数据存储在 JavaScript 数组中
    var dataArray = XLSX.utils.sheet_to_json(worksheet);

    // 将 JavaScript 数组中的数据显示在页面上
    displayData(dataArray);
  };
  reader.readAsBinaryString(file);
}

function displayData(data) {
  // 在页面上创建一个表格来显示数据
  var table = document.createElement('table');

  // 遍历数据并将其添加到表中
  for (var i = 0; i < data.length; i++) {
    var row = table.insertRow();
    for (var key in data[i]) {
      var cell = row.insertCell();
      cell.innerHTML = data[i][key];
    }
  }

  // 将表格添加到文档中
  document.body.appendChild(table);
}

Practical case

The following is a practical case showing how to use HTML and JavaScript to read data from an Excel file:

1. Create an HTML file and reference the XLSX library.
2. Add an <input type="file"> element to allow the user to select an Excel file.
3. Add a button element that triggers the readExcelData() function when the user clicks it.
4. In the readExcelData() function, use the JavaScript FileReader API to read the Excel file and convert it to a binary string.
5. Use the XLSX library to parse the binary string and get the data in the first worksheet.
6. Store worksheet data in a JavaScript array and then display it in an HTML page using the displayData() function.

Conclusion

By embedding Excel data in HTML, we can create powerful and interactive dashboards and charts. This article describes how to use JavaScript to read Excel data and provides a practical case to illustrate its application. Mastering these techniques can greatly improve the efficiency of data analysis and visualization.

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