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Number Text Input Formatter

Number Text Input Formatter for Flutter.

Installation

dependencies:
  number_text_input_formatter: ^1.0.0

Usage

NumberTextInputFormatter

General-purpose formatter for numeric input fields.

TextField(
  inputFormatters: [
    NumberTextInputFormatter(
      integerDigits: 10,
      decimalDigits: 2,
      maxValue: '1000000000.00',
      decimalSeparator: '.',
      groupDigits: 3,
      groupSeparator: ',',
      allowNegative: false,
      overrideDecimalPoint: true,
      insertDecimalPoint: false,
      insertDecimalDigits: true,
    ),
  ],
  keyboardType: TextInputType.number,
),

Parameters

Parameter	Type	Default	Description
integerDigits	int?	null	Maximum number of integer digits. Must be > 0 if provided.
decimalDigits	int?	null	Maximum number of decimal digits. Must be >= 0 if provided.
maxValue	String?	null	Maximum allowed value (e.g. '9999.99'). Infers integerDigits and decimalDigits if not set.
decimalSeparator	String	'.'	Character used as the decimal point. Must be a single character.
groupDigits	int?	null	Group integer digits every N digits (e.g. 3 for thousands). Must be > 1 if provided.
groupSeparator	String	','	Character used as the grouping separator. Must be a single character, different from decimalSeparator.
allowNegative	bool	false	Whether to allow negative numbers.
fixNumber	bool	true	Inserts 0 before a leading decimal point, and 0 after a trailing decimal point.
insertDecimalPoint	bool	false	Automatically inserts the decimal point as the user types (e.g. 123 → 1.23). Requires decimalDigits to be set.
insertDecimalDigits	bool	false	Always appends decimal digits with zeros (e.g. 5 → 5.00). Requires decimalDigits to be set.
overrideDecimalPoint	bool	false	When a second decimal point is typed, moves the decimal point to the new position instead of ignoring it.
prefix	String?	null	String prepended to the formatted value (e.g. '\$ ').
suffix	String?	null	String appended to the formatted value (e.g. ' USD').

---

CurrencyTextInputFormatter

Pre-configured formatter for currency input. Defaults: 2 decimal digits, grouping every 3 digits, decimal point auto-inserted.

TextField(
  inputFormatters: [
    CurrencyTextInputFormatter(
      prefix: '\$ ',
    ),
  ],
  keyboardType: TextInputType.number,
),

Parameters

Same as NumberTextInputFormatter with these defaults:

Parameter	Default
decimalDigits	2
groupDigits	3
insertDecimalPoint	true

---

PercentageTextInputFormatter

Pre-configured formatter for percentage input. Defaults: max 100, 0 decimal digits, decimal digits always inserted.

TextField(
  inputFormatters: [
    PercentageTextInputFormatter(
      suffix: '%',
    ),
  ],
  keyboardType: TextInputType.number,
),

Parameters

Same as NumberTextInputFormatter with these defaults:

Parameter	Default
integerDigits	3 (minimum 3)
decimalDigits	0
insertDecimalDigits	true

The maxValue is automatically computed from integerDigits and decimalDigits (e.g. integerDigits: 3 → max 100).