Specifies the Excel (.xlsx) Extensions to the Office OpenXML SpreadsheetML File Format, which are extensions to the Office Open XML fileformats as described in [ISO/IEC-29500-1]. The extensions are specified usingconventions provided by the Office Open XML file formats as described in[ISO/IEC-29500-3].
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The SheetJS Community Edition offers battle-tested open-source solutions forextracting useful data from almost any complex spreadsheet and generating newspreadsheets that will work with legacy and modern software alike.
SheetJS Pro offers solutions beyond data processing:Edit complex templates with ease; let out your inner Picasso with styling; makecustom sheets with images/graphs/PivotTables; evaluate formula expressions andport calculations to web apps; automate common spreadsheet tasks, and much more!
For broad compatibility with JavaScript engines, the library is written usingECMAScript 3 language dialect as well as some ES5 features like Array#forEach.Older browsers require shims to provide missing functions.
The script also includes IE_LoadFile and IE_SaveFile for loading and savingfiles in Internet Explorer versions 6-9. The xlsx.extendscript.js scriptbundles the shim in a format suitable for Photoshop and other Adobe products.
A common problem involves generating a valid spreadsheet export from data storedin an HTML table. In this example, an HTML TABLE on the page will be scraped,a row will be added to the bottom with the date of the report, and a new filewill be generated and downloaded locally. XLSX.writeFile takes care ofpackaging the data and attempting a local download:
This library tries to simplify steps 2 and 4 with functions to extract usefuldata from spreadsheet files (read / readFile) and generate new spreadsheetfiles from data (write / writeFile). Additional utility functions liketable_to_book work with other common data sources like HTML tables.
For friendly JS processing, there are utility functions for converting parts ofa worksheet to/from an Array of Arrays. The following example combines powerfulJS Array methods with a network request library to download data, select theinformation we want and create a workbook file:
Array#filter creates a new array with the desired rows. A President servedat least one term with type set to "prez". To test if a particular row hasat least one "prez" term, Array#some is another native JS function. Thecomplete filter would be:
For this example, the name will be the first name combined with the last name(row.name.first + " " + row.name.last) and the birthday will be the subfieldrow.bio.birthday. Using Array#map, the dataset can be massaged in one call:
The readFile method attempts to read a spreadsheet file at the supplied path.Browsers generally do not allow reading files in this way (it is deemed asecurity risk), and attempts to read files in this way will throw an error.
Spreadsheet software generally require at least one worksheet and enforce therequirement in the user interface. This library enforces the requirement atwrite time, throwing errors if an empty workbook is passed to write functions.
The aoa_to_sheet utility function walks an "array of arrays" in row-majororder, generating a worksheet object. The following snippet generates a sheetwith cell A1 set to the string A1, cell B1 set to B1, etc:
The json_to_sheet utility function walks an array of JS objects in order,generating a worksheet object. By default, it will generate a header row andone row per object in the array. The optional opts argument has settings tocontrol the column order and header output.
x-spreadsheet is an interactivedata grid for previewing and modifying structured data in the web browser. Thexspreadsheet demo includes a sample script with thextos function for converting from x-spreadsheet data object to a workbook. -spreadsheet is a live demo.
@tensorflow/tfjs and other libraries expect data in simplearrays, well-suited for worksheets where each column is a data vector. That isthe transpose of how most people use spreadsheets, where each row is a vector.
The table_to_sheet utility function takes a DOM TABLE element and iteratesthrough the rows to generate a worksheet. The opts argument is optional."HTML Table Input" describes the function in more detail.
The options argument supports the same options as table_to_sheet, with theaddition of a sheet property to control the worksheet name. If the propertyis missing or no options are specified, the default name Sheet1 is used.
The headless demo includes a complete demo to convert HTMLfiles to XLSB workbooks. The core idea is to add the script to the page, parsethe table in the page context, generate a base64 workbook and send it backfor further processing:
The headless demo includes a complete demo to convert HTMLfiles to XLSB workbooks using PhantomJS. The core ideais to add the script to the page, parse the table in the page context, generatea binary workbook and send it back for further processing:
The "Common Spreadsheet Format" is a simple objectrepresentation of the core concepts of a workbook. The utility functions workwith the object representation and are intended to handle common use cases.
The book_append_sheet utility function appends a worksheet to the workbook.The third argument specifies the desired worksheet name. Multiple worksheets canbe added to a workbook by calling the function multiple times. If the worksheetname is already used in the workbook, it will throw an error.
If the fourth argument is true, the function will start with the specifiedworksheet name. If the sheet name exists in the workbook, a new worksheet namewill be chosen by finding the name stem and incrementing the counter:
The Sheets property of the workbook object is an object whose keys are namesand whose values are worksheet objects. By reassigning to a property of theSheets object, the worksheet object can be changed without disrupting therest of the worksheet structure.
The sheet_add_aoa utility function modifies cell values in a worksheet. Thefirst argument is the worksheet object. The second argument is an array ofarrays of values. The origin key of the third argument controls where cellswill be written. The following snippet sets B3=1 and E5="abc":
The write method attempts to package data from the workbook into a file inmemory. By default, XLSX files are generated, but that can be controlled withthe bookType property of the opts argument. Based on the type option,the data can be stored as a "binary string", JS string, Uint8Array or Buffer.
The writeFile method packages the data and attempts to save the new file. Theexport file format is determined by the extension of filename (SheetJS.xlsxsignals XLSX export, SheetJS.xlsb signals XLSB export, etc).
The writeFile method uses platform-specific APIs to initiate the file save. InNodeJS, fs.readFileSync can create a file. In the web browser, a download isattempted using the HTML5 download attribute, with fallbacks for IE. 152ee80cbc
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