Merging Excel files is a common task that many people encounter when working with data. As projects expand or teams collaborate, you may find yourself with multiple spreadsheets that need to be combined into one cohesive document. This process not only helps in organizing information but also makes it easier to analyze and draw insights from your data. Whether you're dealing with financial records, project updates, or any other type of data, knowing how to merge Excel files effectively can save you time and effort. In this guide, we'll explain how to programmatically merge Excel files into one in React using Spire.XLS for JavaScript.
Install Spire.XLS for JavaScript
To get started with merging Excel files into one in a React application, you can either download Spire.XLS for JavaScript from our website or install it via npm with the following command:
npm i spire.office
The downloaded product package has been integrated Spire.Doc for JavaScript，Spire.XLS for JavaScript，Spire.PDF for JavaScript，Spire.Presentation for JavaScript. To use the functionality of Spire.XLS for JavaScript, you need to copy the corresponding files (spire.xls.js, Spire.Xls.Wasm.zip, spire.common.js, Spire.Common.Wasm.zip, and _framework) to the project's "public" folder. At the same time, in order to ensure text rendering, the related font files can be added with custom paths. In the following example, the font addition path is: public\static\font.
For more details, refer to the documentation: How to Integrate Spire.XLS for JavaScript in a React Project
Merge Multiple Excel Workbooks into One
Combining multiple Excel workbooks allows you to merge distinct files into a single workbook, which simplifies the management and analysis of diverse datasets for comprehensive reporting.
With Spire.XLS for JavaScript, developers can efficiently merge multiple workbooks by copying worksheets from the source workbooks into a newly created workbook using the XlsWorksheetsCollection.AddCopy() method. The key steps are as follows.
- Put the file paths of the workbooks to be merged into a list.
- Initialize a Workbook object to create a new workbook and clear its default worksheets.
- Initialize a temporary Workbook object.
- Loop through the list of file paths.
- Load each workbook specified by the file path in the list into the temporary Workbook object using Workbook.LoadFromFile() method.
- Loop through the worksheets in the temporary workbook, then copy each worksheet from the temporary workbook to the newly created workbook using XlsWorksheetsCollection.AddCopy() method.
- Save the resulting workbook using Workbook.SaveToFile() method.
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
const [wasmModule, setWasmModule] = useState(null);
// Load Spire.XLS
useEffect(() => {
(async () => {
try {
const publicUrl = process.env.PUBLIC_URL || '';
const spireModule = await import(/* webpackIgnore: true */ `${publicUrl}/spire.xls.js`);
const rawModule = spireModule.default || spireModule;
window.wasmModule = typeof rawModule === 'function'
? await rawModule({ locateFile: p => p.endsWith('.wasm') ? `${publicUrl}/${p}` : p })
: rawModule;
setWasmModule(window.wasmModule);
} catch (error) {
console.error('Failed to load spire.xls.js WASM module:', error);
}
})();
}, []);
// Function to merge Excel workbooks into one
const MergeExcelWorkbooks = async () => {
const wasmModule = window.wasmModule.spirexls;
if (wasmModule) {
// Load font into Virtual File System (VFS)
await window.spire.FetchFileToVFS('Arial.ttf', '/Library/Fonts/', `${process.env.PUBLIC_URL}/static/font/`);
// Load the Excel files into the virtual file system (VFS)
const files = [
"File1.xlsx",
"File2.xlsx",
"File3.xlsx",
];
for (const file of files) {
await window.spire.FetchFileToVFS(file, '', `${process.env.PUBLIC_URL}/static/data/`);
}
// Create a new workbook
let newbook = new wasmModule.Workbook();
newbook.Version = wasmModule.ExcelVersion.Version2013;
// Clear the default worksheets
newbook.Worksheets.Clear();
// Create a temp workbook
let tempbook = new wasmModule.Workbook();
for (const file of files) {
// Load the current file
tempbook.LoadFromFile(file.split("/").pop());
for (let i = 0; i < tempbook.Worksheets.Count; i++) {
let sheet = tempbook.Worksheets.get(i);
// Copy every sheet in the current file to the new workbook
wasmModule.XlsWorksheetsCollection.Convert(
newbook.Worksheets
).AddCopy({
sheet: sheet,
flags: wasmModule.WorksheetCopyType.CopyAll,
});
}
}
let outputFileName = "MergeExcelWorkbooks.xlsx";
// Save the resulting file
newbook.SaveToFile({ fileName: outputFileName, version: wasmModule.ExcelVersion.Version2013 });
// Read the saved file and convert to Blob object
const modifiedFileArray = window.dotnetRuntime.Module.FS.readFile(outputFileName);
const modifiedFile = new Blob([modifiedFileArray], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' });
// Create a URL for the Blob and initiate download
const url = URL.createObjectURL(modifiedFile);
const a = document.createElement('a');
a.href = url;
a.download = outputFileName;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
// Clean up resources used by the workbook
newbook.Dispose();
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Merge Multiple Excel Workbooks into One Using JavaScript in React</h1>
<button onClick={MergeExcelWorkbooks} disabled={!wasmModule}>
Merge
</button>
</div>
);
}
export default App;
Run the code to launch the React app at localhost:3000. Once it's running, click on the "Merge" button to merge multiple Excel workbooks into one:
The screenshot below showcases the input workbooks and the output workbook:
Merge Multiple Excel Worksheets into One
Consolidating multiple worksheets into a single sheet enhances clarity and provides a comprehensive overview of related information.
Using Spire.XLS for JavaScript, developers can merge multiple worksheets by copying the used data ranges in these worksheets into a single worksheet using the CellRange.Copy() method. The key steps are as follows.
- Initialize a Workbook object and load an Excel workbook using Workbook.LoadFromFile() method.
- Get the two worksheets to be merged using Workbook.Worksheets.get() method.
- Get the used data range of the second worksheet using Worksheet.AllocatedRange property.
- Specify the destination range in the first worksheet using Worksheet.Range.get() method.
- Copy the used data range from the second worksheet to the specified destination range in the first worksheet using CellRange.Copy() method.
- Remove the second worksheet from the workbook.
- Save the resulting workbook using Workbook.SaveToFile() method.
- JavaScript
import React, { useState, useEffect } from 'react';
function App() {
const [wasmModule, setWasmModule] = useState(null);
// Load Spire.XLS
useEffect(() => {
(async () => {
try {
const publicUrl = process.env.PUBLIC_URL || '';
const spireModule = await import(/* webpackIgnore: true */ `${publicUrl}/spire.xls.js`);
const rawModule = spireModule.default || spireModule;
window.wasmModule = typeof rawModule === 'function'
? await rawModule({ locateFile: p => p.endsWith('.wasm') ? `${publicUrl}/${p}` : p })
: rawModule;
setWasmModule(window.wasmModule);
} catch (error) {
console.error('Failed to load spire.xls.js WASM module:', error);
}
})();
}, []);
// Function to merge worksheets in an Excel workbook into one
const MergeWorksheets = async () => {
const wasmModule = window.wasmModule.spirexls;
if (wasmModule) {
// Load font into Virtual File System (VFS)
await window.spire.FetchFileToVFS('Arial.ttf', '/Library/Fonts/', `${process.env.PUBLIC_URL}/static/font/`);
// Load the Excel files into the virtual file system (VFS)
let inputFileName = 'sample.xlsx';
await window.spire.FetchFileToVFS(inputFileName, '', `${process.env.PUBLIC_URL}/static/data/`);
// Create a new workbook
let workbook = new wasmModule.Workbook();
// Load the Excel file from the virtual file system
workbook.LoadFromFile(inputFileName);
// Get the first worksheet
let sheet1 = workbook.Worksheets.get(0);
// Get the second worksheet
let sheet2 = workbook.Worksheets.get(1);
// Get the used range in the second worksheet
let fromRange = sheet2.AllocatedRange;
// Specify the destination range in the first worksheet
let toRange = sheet1.Range.get({ row: sheet1.LastRow + 1, column: 1 });
// Copy the used range from the second worksheet to the destination range in the first worksheet
fromRange.Copy({ destRange: toRange });
// Remove the second worksheet
sheet2.Remove();
// Define the output file name
const outputFileName = "MergeWorksheets.xlsx";
// Save the workbook to the specified path
workbook.SaveToFile({ fileName: outputFileName, version: wasmModule.ExcelVersion.Version2010 });
// Read the saved file and convert to Blob object
const modifiedFileArray = window.dotnetRuntime.Module.FS.readFile(outputFileName);
const modifiedFile = new Blob([modifiedFileArray], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' });
// Create a URL for the Blob and initiate download
const url = URL.createObjectURL(modifiedFile);
const a = document.createElement('a');
a.href = url;
a.download = outputFileName;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(url);
// Clean up resources used by the workbook
workbook.Dispose();
}
};
return (
<div style={{ textAlign: 'center', height: '300px' }}>
<h1>Merge Multiple Excel Worksheets into One Using JavaScript in React</h1>
<button onClick={MergeWorksheets} disabled={!wasmModule}>
Merge
</button>
</div>
);
}
export default App;
Get a Free License
To fully experience the capabilities of Spire.XLS for JavaScript without any evaluation limitations, you can request a free 30-day trial license.
