Add support for cell type

Excel

Excel is a flutter and dart library for reading, creating and updating excel-sheets for XLSX files.

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Road-map:

➕ Formulas and Calculations
💾 Support Multiple Data type efficiently
📈 Charts
🌄 Add Pictures
📰 Create Tables and style
🔐 Encrypt and Decrypt excel on the go.
Many more features

Breaking changes from 3.x.x to 4.x.x

Renamed Formula to FormulaCellValue
Cells value now represented by the sealed class CellValue instead of dynamic. Subtypes are TextCellValue FormulaCellValue, IntCellValue, DoubleCellValue, DateCellValue, TextCellValue, BoolCellValue, TimeCellValue, DateTimeCellValue and they allow for exhaustive switch (see Dart Docs (sealed class modifier)).

Breaking changes from 2.x.x to 3.x.x

Renamed getColAutoFits() to getColumnAutoFits(), and changed return type to Map<int, bool> in Sheet
Renamed getColWidths() to getColumnWidths(), and changed return type to Map<int, double> in Sheet
Renamed getColAutoFit() to getColumnAutoFit() in Sheet
Renamed getColWidth() to getColumnWidth() in Sheet
Renamed setColAutoFit() to setColumnAutoFit() in Sheet
Renamed setColWidth() to setColumnWidth() in Sheet

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Usage

Read XLSX File

var file = 'Path_to_pre_existing_Excel_File/excel_file.xlsx';
var bytes = File(file).readAsBytesSync();
var excel = Excel.decodeBytes(bytes);
for (var table in excel.tables.keys) {
  print(table); //sheet Name
  print(excel.tables[table].maxColumns);
  print(excel.tables[table].maxRows);
  for (var row in excel.tables[table].rows) {
    for (var cell in row) {
      print('cell ${cell.rowIndex}/${cell.columnIndex}');
      final value = cell.value;
      final numFormat = cell.cellStyle?.numberFormat ?? NumFormat.standard_0;
      switch(value){
        case null:
          print('  empty cell');
          print('  format: ${numFormat}');
        case TextCellValue():
          print('  text: ${value.value}');
        case FormulaCellValue():
          print('  formula: ${value.formula}');
          print('  format: ${numFormat}');
        case IntCellValue():
          print('  int: ${value.value}');
          print('  format: ${numFormat}');
        case BoolCellValue():
          print('  bool: ${value.value ? 'YES!!' : 'NO..' }');
          print('  format: ${numFormat}');
        case DoubleCellValue():
          print('  double: ${value.value}');
          print('  format: ${numFormat}');
        case DateCellValue():
          print('  date: ${value.year} ${value.month} ${value.day} (${value.asDateTimeLocal()})');
        case TimeCellValue():
          print('  time: ${value.hour} ${value.minute} ... (${value.asDuration()})');
        case DateTimeCellValue():
          print('  date with time: ${value.year} ${value.month} ${value.day} ${value.hour} ... (${value.asDateTimeLocal()})');
      }

      print('$row');
    }
  }
}

Read XLSX in Flutter Web

Use FilePicker to pick files in Flutter Web. FilePicker

/// Use FilePicker to pick files in Flutter Web

FilePickerResult pickedFile = await FilePicker.platform.pickFiles(
  type: FileType.custom,
  allowedExtensions: ['xlsx'],
  allowMultiple: false,
);

/// file might be picked

if (pickedFile != null) {
  var bytes = pickedFile.files.single.bytes;
  var excel = Excel.decodeBytes(bytes);
  for (var table in excel.tables.keys) {
    print(table); //sheet Name
    print(excel.tables[table].maxColumns);
    print(excel.tables[table].maxRows);
    for (var row in excel.tables[table].rows) {
      print('$row');
    }
  }
}

Read XLSX from Flutter's Asset Folder

import 'package:flutter/services.dart' show ByteData, rootBundle;

/* Your ......other important..... code here */

ByteData data = await rootBundle.load('assets/existing_excel_file.xlsx');
var bytes = data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);
var excel = Excel.decodeBytes(bytes);

for (var table in excel.tables.keys) {
  print(table); //sheet Name
  print(excel.tables[table].maxColumns);
  print(excel.tables[table].maxRows);
  for (var row in excel.tables[table].rows) {
    print('$row');
  }
}

Create New XLSX File

// automatically creates 1 empty sheet: Sheet1
var excel = Excel.createExcel();

Update Cell values

/*
 * sheetObject.updateCell(cell, value, { CellStyle (Optional)});
 * sheetObject created by calling - // Sheet sheetObject = excel['SheetName'];
 * cell can be identified with Cell Address or by 2D array having row and column Index;
 * Cell Style options are optional
 */

Sheet sheetObject = excel['SheetName'];

CellStyle cellStyle = CellStyle(backgroundColorHex: '#1AFF1A', fontFamily :getFontFamily(FontFamily.Calibri));

cellStyle.underline = Underline.Single; // or Underline.Double


var cell = sheetObject.cell(CellIndex.indexByString('A1'));
cell.value = null; // removing any value
cell.value = TextCellValue('Some Text');
cell.value = IntCellValue(8);
cell.value = BoolCellValue(true);
cell.value = DoubleCellValue(13.37);
cell.value = DateCellValue(year: 2023, month: 4, day: 20);
cell.value = TimeCellValue(hour: 20, minute: 15, second: 5, millisecond: ...);
cell.value = DateTimeCellValue(year: 2023, month: 4, day: 20, hour: 15, ...);
cell.cellStyle = cellStyle;

// setting the number style
cell.cellStyle = (cell.cellStyle ?? CellStyle()).copyWith(

  /// for IntCellValue, DoubleCellValue and BoolCellValue use; 
  numberFormat: CustomNumericNumFormat('#,##0.00 \\m\\²'),

  /// for DateCellValue and DateTimeCellValue use:
  numberFormat: CustomDateTimeNumFormat('m/d/yy h:mm'),

  /// for TimeCellValue use:
  numberFormat: CustomDateTimeNumFormat('mm:ss'),

  /// a builtin format for dates
  numberFormat: NumFormat.standard_14,
  
  /// a builtin format that uses a red text color for negative numbers
  numberFormat: NumFormat.standard_38,

  // The numberFormat changes automatially if you set a CellValue that 
  // does not work with the numberFormat set previously. So in case you
  // want to set a new value, e.g. from a date to a decimal number, 
  // make sure you set the new value first and then your custom
  // numberFormat).
);


// printing cell-type
print('CellType: ' + switch(cell.value) {
  null => 'empty cell',
  TextCellValue() => 'text',
  FormulaCellValue() => 'formula',
  IntCellValue() => 'int',
  BoolCellValue() => 'bool',
  DoubleCellValue() => 'double',
  DateCellValue() => 'date',
  TimeCellValue => 'time',
  DateTimeCellValue => 'date with time',
});

///
/// Inserting and removing column and rows

// insert column at index = 8
sheetObject.insertColumn(8);

// remove column at index = 18
sheetObject.removeColumn(18);

// insert row at index = 82
sheetObject.insertRow(82);

// remove row at index = 80
sheetObject.removeRow(80);

Cell-Style Options

key	description
fontFamily	eg. getFontFamily(`FontFamily.Arial`) or getFontFamily(`FontFamily.Comic_Sans_MS`) `There is total 182 Font Families available for now`
fontSize	specify the font-size as integer eg. fontSize = 15
bold	makes text bold - when set to `true`, by-default it is set to `false`
italic	makes text italic - when set to `true`, by-default it is set to `false`
underline	Gives underline to text `enum Underline { None, Single, Double }` eg. Underline.Single, by-default it is set to Underline.None
fontColorHex	Font Color eg. '#0000FF'
rotation (degree)	rotation of text eg. 50, rotation varies from `-90 to 90`, with including `90` and `-90`
backgroundColorHex	Background color of cell eg. '#faf487'
wrap	Text wrapping `enum TextWrapping { WrapText, Clip }` eg. TextWrapping.Clip
verticalAlign	align text vertically `enum VerticalAlign { Top, Center, Bottom }` eg. VerticalAlign.Top
horizontalAlign	align text horizontally `enum HorizontalAlign { Left, Center, Right }` eg. HorizontalAlign.Right
leftBorder	the left border of the cell (see below)
rightBorder	the right border of the cell
topBorder	the top border of the cell
bottomBorder	the bottom border of the cell
diagonalBorder	the diagonal "border" of the cell
diagonalBorderUp	boolean value indicating if the diagonal "border" should be displayed on the up diagonal
diagonalBorderDown	boolean value indicating if the diagonal "border" should be displayed on the down diagonal
numberFormat	a subtype of `NumFormat` to style the CellValue displayed, use default formats such as `NumFormat.standard_34` or create your own using `CustomNumericNumFormat('#,##0.00 \\m\\²')` `CustomDateTimeNumFormat('m/d/yy h:mm')` `CustomTimeNumFormat('mm:ss')`

Borders

Borders are defined for each side (left, right, top, and bottom) of the cell. Both diagonals (up and down) share the same settings. A boolean value true must be set to either diagonalBorderUp or diagonalBorderDown (or both) to display the desired diagonal.

Each border must be a Border object. This object accepts two parameters : borderStyle to select one of the different supported styles and borderColorHex to change the border color.

The borderStyle must be a value from the enumerationBorderStyle:

BorderStyle.None
BorderStyle.DashDot
BorderStyle.DashDotDot
BorderStyle.Dashed
BorderStyle.Dotted
BorderStyle.Double
BorderStyle.Hair
BorderStyle.Medium
BorderStyle.MediumDashDot
BorderStyle.MediumDashDotDot
BorderStyle.MediumDashed
BorderStyle.SlantDashDot
BorderStyle.Thick
BorderStyle.Thin

/*
 *
 * Defines thin borders on the left and right of the cell, red thin border on the top
 * and blue medium border on the bottom.
 *
 */

CellStyle cellStyle = CellStyle(
  leftBorder: Border(borderStyle: BorderStyle.Thin),
  rightBorder: Border(borderStyle: BorderStyle.Thin),
  topBorder: Border(borderStyle: BorderStyle.Thin, borderColorHex: 'FFFF0000'),
  bottomBorder: Border(borderStyle: BorderStyle.Medium, borderColorHex: 'FF0000FF'),
);

Make sheet RTL

/*
 * set rtl to true for making sheet to right-to-left
 * default value of rtl = false ( which means the fresh or default sheet is ltr )
 *
 */

var sheetObject = excel['SheetName'];
sheetObject.rtl = true;

Copy sheet contents to another sheet

/*
 * excel.copy(String 'existingSheetName', String 'anotherSheetName');
 * existingSheetName should exist in excel.tables.keys in order to successfully copy
 * if anotherSheetName does not exist then it will be automatically created.
 *
 */

excel.copy('existingSheetName', 'anotherSheetName');

Rename sheet

/*
 * excel.rename(String 'existingSheetName', String 'newSheetName');
 * existingSheetName should exist in excel.tables.keys in order to successfully rename
 *
 */

excel.rename('existingSheetName', 'newSheetName');

Delete sheet

/*
 * excel.delete(String 'existingSheetName');
 * (existingSheetName should exist in excel.tables.keys) and (excel.tables.keys.length >= 2), in order to successfully delete.
 *
 */

excel.delete('existingSheetName');

Link sheet

/*
 * excel.link(String 'sheetName', Sheet sheetObject);
 *
 * Any operations performed on (object of 'sheetName') or sheetObject then the operation is performed on both.
 * if 'sheetName' does not exist then it will be automatically created and linked with the sheetObject's operation.
 *
 */

excel.link('sheetName', sheetObject);

Un-Link sheet

/*
 * excel.unLink(String 'sheetName');
 * In order to successfully unLink the 'sheetName' then it must exist in excel.tables.keys
 *
 */

excel.unLink('sheetName');

// After calling the above function be sure to re-make a new reference of this.

Sheet unlinked_sheetObject = excel['sheetName'];

Merge Cells

/*
 * sheetObject.merge(CellIndex starting_cell, CellIndex ending_cell, TextCellValue('customValue'));
 * sheetObject created by calling - // Sheet sheetObject = excel['SheetName'];
 * starting_cell and ending_cell can be identified with Cell Address or by 2D array having row and column Index;
 * customValue is optional
 */

sheetObject.merge(CellIndex.indexByString('A1'), CellIndex.indexByString('E4'), customValue: TextCellValue('Put this text after merge'));

Get Merged Cells List

// Check which cells are merged

sheetObject.spannedItems.forEach((cells) {
  print('Merged:' + cells.toString());
});

Un-Merge Cells

/*
 * sheetObject.unMerge(cell);
 * sheetObject created by calling - // Sheet sheetObject = excel['SheetName'];
 * cell should be identified with string only with an example as 'A1:E4'.
 * to check if 'A1:E4' is un-merged or not
 * call the method excel.getMergedCells(sheet); and verify that it is not present in it.
 */

sheetObject.unMerge('A1:E4');

Find and Replace

/*
 * int replacedCount = sheetObject.findAndReplace(source, target);
 * sheetObject created by calling - // Sheet sheetObject = excel['SheetName'];
 * source is the string or ( User's Custom Pattern Matching RegExp )
 * target is the string which is put in cells in place of source
 *
 * it returns the number of replacements made
 */

int replacedCount = sheetObject.findAndReplace('Flutter', 'Google');

Insert Row Iterables

/*
 * sheetObject.insertRowIterables(list-iterables, rowIndex, iterable-options?);
 * sheetObject created by calling - // Sheet sheetObject = excel['SheetName'];
 * list-iterables === list of iterables which has to be put in specific row
 * rowIndex === the row in which the iterables has to be put
 * Iterable options are optional
 */

/// It will put the list-iterables in the 8th index row
List<CellValue> dataList = [TextCellValue('Google'), TextCellValue('loves'), TextCellValue('Flutter'), TextCellValue('and'), TextCellValue('Flutter'), TextCellValue('loves'), TextCellValue('Excel')];

sheetObject.insertRowIterables(dataList, 8);

Iterable Options

key	description
startingColumn	starting column index from which list-iterables should be started
overwriteMergedCells	overwriteMergedCells is by-defalut set to `true`, when set to `false` it will stop over-write and will write only in unique cells

Append Row

/*
 * sheetObject.appendRow(list-iterables);
 * sheetObject created by calling - // Sheet sheetObject = excel['SheetName'];
 * list-iterables === list of iterables
 */

sheetObject.appendRow([TextCellValue('Flutter'), TextCellValue('till'), TextCellValue('Eternity')]);

Get Default Opening Sheet

/*
 * method which returns the name of the default sheet
 * excel.getDefaultSheet();
 */

var defaultSheet = excel.getDefaultSheet();
print('Default Sheet:' + defaultSheet.toString());

Set Default Opening Sheet

/*
 * method which sets the name of the default sheet
 * returns bool if successful then true else false
 * excel.setDefaultSheet(sheet);
 * sheet = 'SheetName'
 */

var isSet = excel.setDefaultSheet(sheet);
if (isSet) {
  print('$sheet is set to default sheet.');
} else {
  print('Unable to set $sheet to default sheet.');
}

Saving

On Flutter Web

// when you are in flutter web then save() downloads the excel file.

// Call function save() to download the file
var fileBytes = excel.save(fileName: 'My_Excel_File_Name.xlsx');

On Android / iOS

For getting saving directory on Android or iOS, Use: path_provider

var fileBytes = excel.save();
var directory = await getApplicationDocumentsDirectory();

File(join('$directory/output_file_name.xlsx'))
  ..createSync(recursive: true)
  ..writeAsBytesSync(fileBytes);

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