Hướng dẫn js create excel file

Welcome to a tutorial on how to create an Excel file in Javascript. Yes, you read that right. We are referring to “browser Javascript”, and not the server-side NodeJS. The dark days have passed and it is actually possible to generate Excel files using client-side Javascript – Read on for the example!

ⓘ I have included a zip file with all the source code at the start of this tutorial, so you don’t have to copy-paste everything… Or if you just want to dive straight in.

TABLE OF CONTENTS

DOWNLOAD & NOTES

Firstly, here is the download link to the example code as promised.

QUICK NOTES

If you spot a bug, feel free to comment below. I try to answer short questions too, but it is one person versus the entire world… If you need answers urgently, please check out my list of websites to get help with programming.

EXAMPLE CODE DOWNLOAD

Click here to download all the example source code, I have released it under the MIT license, so feel free to build on top of it or use it in your own project.

All right, let us now get into the example of generating an Excel file in Javascript and offering it as a download.

PART 1] THE HTML

create-excel.html

 

Download Demo Excel
 


document.getElementById["demo"]. title = [] => {
  // GENERATE DEMO EXCEL FILE
};

Yep, that is pretty much everything we need to drive the example.

1. Load SheetJS from CDNJS, this library is required to create the Excel file. Will leave a link in the extras section below to their full documentation.
2. Just a demo button to start generating the Excel file.
3. Click on the demo button to generate the Excel file. Details below.

PART 2] THE JAVASCRIPT

2A] DUMMY DATA

create-excel.html

// [C1] DUMMY DATA
var data = [
  ["Joa Doe", ""],
  ["Job Doe", ""],
  ["Joe Doe", ""],
  ["Jon Doe", ""],
  ["Joy Doe", ""]
];

For the Javascript, we will first start by defining a nested array of dummy data. Don’t think it needs a lot of explanation, this will get “converted” into rows and columns in the Excel file.

2B] CREATE A NEW EXCEL OBJECT

create-excel.html

// [C2] CREATE NEW EXCEL "FILE"
var workbook = XLSX.utils.book_new[],
    worksheet = XLSX.utils.aoa_to_sheet[data];
workbook.SheetNames.push["First"];
workbook.Sheets["First"] = worksheet;

This should be pretty self-explanatory for the folks who already know Excel well, but for the sake of those who are new:

• A “workbook” is simply “the entire Excel file”.
• A “worksheet” is a table within a workbook.
• A workbook can contain multiple worksheets.

So what this section is doing:

• workbook = XLSX.utils.book_new[] Creates a new Excel workbook.
• worksheet = XLSX.utils.aoa_to_sheet[data] Creates a new worksheet, using the dummy data array above.
• workbook.SheetNames.push["First"] and workbook.Sheets["First"] = worksheet Attach the worksheet to the workbook.

2C] CONVERT TO BLOB 

create-excel.html

// [C3] TO BINARY STRING
var xlsbin = XLSX.write[workbook, {
  bookType: "xlsx",
  type: "binary"
}];
 
// [C4] TO BLOB OBJECT
var buffer = new ArrayBuffer[xlsbin.length],
    array = new Uint8Array[buffer];
for [var i=0; i