inputModenumeric

Inputmodenumeric is a configuration option used by user interface and data-entry components to restrict input to numeric data. When active, the input control validates characters in real time and typically accepts digits 0 through 9, an optional sign, and a decimal separator; some locales also permit grouping separators or an exponent. The primary goal is to prevent invalid data from being entered and to simplify downstream parsing for calculations, storage, or validation.

In practice, inputmodenumeric is implemented via a combination of character filtering, input masks, and validators. Implementations may block non-numeric keystrokes, prevent paste of non-numeric content, and provide immediate feedback such as highlighting or error messages when the current value violates constraints. Configurable aspects commonly include allowed character sets, minimum and maximum values, precision or number of fractional digits, and locale-aware rules for decimal and thousands separators. Some toolkits separate formatting from validation, using a numeric validator together with a separate formatting renderer to show user-friendly numbers while keeping the underlying value well-formed.

Usage and context: Numeric input mode is widely used in financial forms, quantity fields, measurement entries, and any interface requiring controlled numeric input. It often works in tandem with localization settings and may influence on-screen keyboards on mobile devices to present a numeric keypad.

See also: inputmode, input validation, input masking, numeric keypad.