- Qt 6.5
- Qt Quick
- QML Types
- DoubleValidator
- Qt 6.5.1 Reference Documentation

# DoubleValidator QML Type

Defines a validator for non-integer numbers. More...

Import Statement: | import QtQuick
Instantiates: | QDoubleValidator

- List of all members, including inherited members

## Properties

- bottom : real
- decimals : int
- locale : string
- notation : enumeration
- top : real

## Detailed Description

The DoubleValidator type provides a validator for non-integer numbers.

Input is accepted if it contains a double that is within the valid range and is in the correct format.

Input is accepected but invalid if it contains a double that is outside the range or is in the wrong format; e.g. with too many digits after the decimal point or is empty.

Input is rejected if it is not a double.

Note: If the valid range consists of just positive doubles (e.g. 0.0 to 100.0) and input is a negative double then it is rejected. If notation is set to DoubleValidator.StandardNotation, and the input contains more digits before the decimal point than a double in the valid range may have, it is also rejected. If notation is DoubleValidator.ScientificNotation, and the input is not in the valid range, it is accecpted but invalid. The value may yet become valid by changing the exponent.

See also IntValidator, RegularExpressionValidator, and Validating Input Text.

## Property Documentation

[read-only] bottom : real

This property holds the validator's minimum acceptable value. By default, this property contains a value of -infinity.

[read-only] decimals : int

This property holds the validator's maximum number of digits after the decimal point. By default, this property contains a value of 1000.

locale : string

This property holds the name of the locale used to interpret the number.

See also Qt.locale().

[read-only] notation : enumeration

This property holds the notation of how a string can describe a number.

The possible values for this property are:

Constant | Description
--- | ---
`DoubleValidator.StandardNotation` | only decimal numbers with optional sign (e.g. `-0.015`)
`DoubleValidator.ScientificNotation` | (default) the written number may have an exponent part (e.g. `1.5E-2`)

[read-only] top : real

This property holds the validator's maximum acceptable value. By default, this property contains a value of infinity.