2022-05-16 03:26:04 +00:00
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---
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2022-08-13 22:01:26 +00:00
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sidebar_position: 3
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2022-05-16 03:26:04 +00:00
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---
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# Roadmap
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Most scenarios involving spreadsheets and data can be divided into 5 parts:
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1) **Acquire Data**: Data may be stored anywhere: local or remote files,
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databases, HTML TABLE, or even generated programmatically in the web browser.
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2) **Extract Data**: For spreadsheet files, this involves parsing raw bytes to
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read the cell data. For general JS data, this involves reshaping the data.
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3) **Process Data**: From generating summary statistics to cleaning data
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records, this step is the heart of the problem.
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4) **Package Data**: This can involve making a new spreadsheet or serializing
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with `JSON.stringify` or writing XML or simply flattening data for UI tools.
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5) **Release Data**: Spreadsheet files can be uploaded to a server or written
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locally. Data can be presented to users in an HTML TABLE or data grid.
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A common problem involves generating a valid spreadsheet export from data stored
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in an HTML table. In this example, an HTML TABLE on the page will be scraped,
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a row will be added to the bottom with the date of the report, and a new file
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will be generated and downloaded locally. `XLSX.writeFile` takes care of
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packaging the data and attempting a local download:
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```js
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// Acquire Data (reference to the HTML table)
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var table_elt = document.getElementById("my-table-id");
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// Extract Data (create a workbook object from the table)
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var workbook = XLSX.utils.table_to_book(table_elt);
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// Process Data (add a new row)
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var ws = workbook.Sheets["Sheet1"];
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XLSX.utils.sheet_add_aoa(ws, [["Created "+new Date().toISOString()]], {origin:-1});
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// Package and Release Data (`writeFile` tries to write and save an XLSB file)
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XLSX.writeFile(workbook, "Report.xlsb");
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```
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This library tries to simplify steps 2 and 4 with functions to extract useful
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data from spreadsheet files (`read` / `readFile`) and generate new spreadsheet
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files from data (`write` / `writeFile`). Additional utility functions like
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`table_to_book` work with other common data sources like HTML tables.
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This documentation and various demo projects cover a number of common scenarios
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and approaches for steps 1 and 5.
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Utility functions help with step 3.
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## Highlights
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["Data Import"](../solutions/input) describes solutions for common data import
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scenarios.
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["Data Export"](../solutions/output) describes solutions for common data export
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scenarios.
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["Data Processing"](../solutions/processing) describes solutions for common
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workbook processing and manipulation scenarios.
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["Utility Functions"](../api/utilities) details utility functions for
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translating JSON Arrays and other common JS structures into worksheet objects.
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