NumberValidator

Package	mx.validators
Class	public class NumberValidator
Inheritance	NumberValidator Validator EventDispatcher Object

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

The NumberValidator class ensures that a String represents a valid number. It can ensure that the input falls within a given range (specified by minValue and maxValue), is an integer (specified by domain), is non-negative (specified by allowNegative), and does not exceed the specified precision. The validator correctly validates formatted numbers (e.g., "12,345.67") and you can customize the thousandsSeparator and decimalSeparator properties for internationalization.

MXML Syntax expanded

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The <mx:NumberValidator> tag inherits all of the tag attributes of its superclass, and adds the following tag attributes:

  <mx:NumberValidator 
    allowNegative="true|false" 
    decimalPointCountError="The decimal separator can only occur once." 
    decimalSeparator="." 
    domain="real|int" 
    exceedsMaxError="The number entered is too large." 
    integerError="The number must be an integer." 
    invalidCharError="The input contains invalid characters." 
    invalidFormatCharsError="One of the formatting parameters is invalid." 
    lowerThanMinError="The amount entered is too small." 
    maxValue="NaN" 
    minValue="NaN" 
    negativeError="The amount may not be negative." 
    precision="-1" 
    precisionError="The amount entered has too many digits beyond the decimal point." 
    separationError="The thousands separator must be followed by three digits." 
    thousandsSeparator="," 
  />

View the examples

More examples

Enabling and disabling a validator
Validating numbers

Learn more

Validating data
About the source and property properties
About triggering validation
Triggering validation by using events
Triggering validation programmatically
Validating required fields
General guidelines for validation
Working with validation errors
Working with validation events

Public Properties

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	Property		Defined By
		allowNegative : Object Specifies whether negative numbers are permitted.	NumberValidator
		constructor : Object A reference to the class object or constructor function for a given object instance.	Object
		decimalPointCountError : String Error message when the decimal separator character occurs more than once.	NumberValidator
		decimalSeparator : String The character used to separate the whole from the fractional part of the number.	NumberValidator
		domain : String Type of number to be validated.	NumberValidator
		enabled : Boolean Setting this value to false will stop the validator from performing validation.	Validator
		exceedsMaxError : String Error message when the value exceeds the maxValue property.	NumberValidator
		integerError : String Error message when the number must be an integer, as defined by the domain property.	NumberValidator
		invalidCharError : String Error message when the value contains invalid characters.	NumberValidator
		invalidFormatCharsError : String Error message when the value contains invalid format characters, which means that it contains a digit or minus sign (-) as a separator character, or it contains two or more consecutive separator characters.	NumberValidator
		listener : Object Specifies the validation listener.	Validator
		lowerThanMinError : String Error message when the value is less than minValue.	NumberValidator
		maxValue : Object Maximum value for a valid number.	NumberValidator
		minValue : Object Minimum value for a valid number.	NumberValidator
		negativeError : String Error message when the value is negative and the allowNegative property is false.	NumberValidator
		precision : Object The maximum number of digits allowed to follow the decimal point.	NumberValidator
		precisionError : String Error message when the value has a precision that exceeds the value defined by the precision property.	NumberValidator
		property : String A String specifying the name of the property of the source object that contains the value to validate.	Validator
		required : Boolean = true If true, specifies that a missing or empty value causes a validation error.	Validator
		requiredFieldError : String Error message when a value is missing and the required property is true.	Validator
		separationError : String Error message when the thousands separator is in the wrong location.	NumberValidator
		source : Object Specifies the object containing the property to validate.	Validator
		thousandsSeparator : String The character used to separate thousands in the whole part of the number.	NumberValidator
		trigger : IEventDispatcher Specifies the component generating the event that triggers the validator.	Validator
		triggerEvent : String Specifies the event that triggers the validation.	Validator

Protected Properties

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	Property		Defined By
		actualListeners : Array [read-only] Contains an Array of listener objects, if any, or the source object.	Validator
		actualTrigger : IEventDispatcher [read-only] Contains the trigger object, if any, or the source object.	Validator
		resourceManager : IResourceManager [read-only] A reference to the object which manages all of the application's localized resources.	Validator
		subFields : Array An Array of Strings containing the names for the properties contained in the value Object passed to the validate() method.	Validator

Public Methods

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	Method		Defined By
		NumberValidator() Constructor.	NumberValidator
		addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void Registers an event listener object with an EventDispatcher object so that the listener receives notification of an event.	EventDispatcher
		dispatchEvent(event:Event):Boolean Dispatches an event into the event flow.	EventDispatcher
		hasEventListener(type:String):Boolean Checks whether the EventDispatcher object has any listeners registered for a specific type of event.	EventDispatcher
		hasOwnProperty(name:String):Boolean Indicates whether an object has a specified property defined.	Object
		initialized(document:Object, id:String):void Called automatically by the MXML compiler when the Validator is created using an MXML tag.	Validator
		isPrototypeOf(theClass:Object):Boolean Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.	Object
		propertyIsEnumerable(name:String):Boolean Indicates whether the specified property exists and is enumerable.	Object
		removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void Removes a listener from the EventDispatcher object.	EventDispatcher
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Sets the availability of a dynamic property for loop operations.	Object
		toLocaleString():String Returns the string representation of this object, formatted according to locale-specific conventions.	Object
		toString():String Returns the string representation of the specified object.	Object
		validate(value:Object = null, suppressEvents:Boolean = false):ValidationResultEvent Performs validation and optionally notifies the listeners of the result.	Validator
		validateAll(validators:Array):Array [static] Invokes all the validators in the validators Array.	Validator
		validateNumber(validator:NumberValidator, value:Object, baseField:String):Array [static] Convenience method for calling a validator from within a custom validation function.	NumberValidator
		valueOf():Object Returns the primitive value of the specified object.	Object
		willTrigger(type:String):Boolean Checks whether an event listener is registered with this EventDispatcher object or any of its ancestors for the specified event type.	EventDispatcher

Protected Methods

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	Method		Defined By
		addListenerHandler():void Sets up all of the listeners for the valid and invalid events dispatched from the validator.	Validator
		doValidation(value:Object):Array [override] Override of the base class doValidation() method to validate a number.	NumberValidator
		getValueFromSource():Object Returns the Object to validate.	Validator
		handleResults(errorResults:Array):ValidationResultEvent Returns a ValidationResultEvent from the Array of error results.	Validator
		isRealValue(value:Object):Boolean Returns true if value is not null.	Validator
		removeListenerHandler():void Disconnects all of the listeners for the valid and invalid events dispatched from the validator.	Validator
		resourcesChanged():void This method is called when a Validator is constructed, and again whenever the ResourceManager dispatches a "change" Event to indicate that the localized resources have changed in some way.	Validator

Events

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	Summary	Defined By
activate	[broadcast event] Dispatched when the Flash Player or AIR application gains operating system focus and becomes active.	EventDispatcher
deactivate	[broadcast event] Dispatched when the Flash Player or AIR application operating loses system focus and is becoming inactive.	EventDispatcher
invalid	Dispatched when validation fails.	Validator
valid	Dispatched when validation succeeds.	Validator

Protected Constants

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	Constant		Defined By

Property Detail

allowNegative

property

allowNegative:Object

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

Specifies whether negative numbers are permitted. Valid values are true or false.

The default value is true.

Implementation
public function get allowNegative():Object
public function set allowNegative(value:Object):void

decimalPointCountError

property

decimalPointCountError:String

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

Error message when the decimal separator character occurs more than once.

The default value is "The decimal separator can occur only once.".

Implementation
public function get decimalPointCountError():String
public function set decimalPointCountError(value:String):void

decimalSeparator

property

decimalSeparator:String

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

The character used to separate the whole from the fractional part of the number. Cannot be a digit and must be distinct from the thousandsSeparator.

The default value is ".".

Implementation
public function get decimalSeparator():String
public function set decimalSeparator(value:String):void

domain

property

domain:String

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

Type of number to be validated. Permitted values are "real" and "int".

In ActionScript, you can use the following constants to set this property: NumberValidatorDomainType.REAL or NumberValidatorDomainType.INT.

The default value is "real".

Implementation
public function get domain():String
public function set domain(value:String):void

exceedsMaxError

property

exceedsMaxError:String

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

Error message when the value exceeds the maxValue property.

The default value is "The number entered is too large.".

Implementation
public function get exceedsMaxError():String
public function set exceedsMaxError(value:String):void

integerError

property

integerError:String

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

Error message when the number must be an integer, as defined by the domain property.

The default value is "The number must be an integer.".

Implementation
public function get integerError():String
public function set integerError(value:String):void

invalidCharError

property

invalidCharError:String

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

Error message when the value contains invalid characters.

The default value is The input contains invalid characters.".

Implementation
public function get invalidCharError():String
public function set invalidCharError(value:String):void

invalidFormatCharsError

property

invalidFormatCharsError:String

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

Error message when the value contains invalid format characters, which means that it contains a digit or minus sign (-) as a separator character, or it contains two or more consecutive separator characters.

The default value is "One of the formatting parameters is invalid.".

Implementation
public function get invalidFormatCharsError():String
public function set invalidFormatCharsError(value:String):void

lowerThanMinError

property

lowerThanMinError:String

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

Error message when the value is less than minValue.

The default value is "The amount entered is too small.".

Implementation
public function get lowerThanMinError():String
public function set lowerThanMinError(value:String):void

maxValue

property

maxValue:Object

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

Maximum value for a valid number. A value of NaN means there is no maximum.

The default value is NaN.

Implementation
public function get maxValue():Object
public function set maxValue(value:Object):void

minValue

property

minValue:Object

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

Minimum value for a valid number. A value of NaN means there is no minimum.

The default value is NaN.

Implementation
public function get minValue():Object
public function set minValue(value:Object):void

negativeError

property

negativeError:String

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

Error message when the value is negative and the allowNegative property is false.

The default value is "The amount may not be negative.".

Implementation
public function get negativeError():String
public function set negativeError(value:String):void

precision

property

precision:Object

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

The maximum number of digits allowed to follow the decimal point. Can be any nonnegative integer. Note: Setting to 0 has the same effect as setting domain to "int". A value of -1 means it is ignored.

The default value is -1.

Implementation
public function get precision():Object
public function set precision(value:Object):void

precisionError

property

precisionError:String

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

Error message when the value has a precision that exceeds the value defined by the precision property.

The default value is "The amount entered has too many digits beyond the decimal point.".

Implementation
public function get precisionError():String
public function set precisionError(value:String):void

separationError

property

separationError:String

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

Error message when the thousands separator is in the wrong location.

The default value is "The thousands separator must be followed by three digits.".

Implementation
public function get separationError():String
public function set separationError(value:String):void

thousandsSeparator

property

thousandsSeparator:String

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

The character used to separate thousands in the whole part of the number. Cannot be a digit and must be distinct from the decimalSeparator.

The default value is ",".

Implementation
public function get thousandsSeparator():String
public function set thousandsSeparator(value:String):void

Constructor Detail

()

Constructor

public function NumberValidator()

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

Constructor.

Method Detail

doValidation

()

method

override protected function doValidation(value:Object):Array

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

Override of the base class doValidation() method to validate a number.

You do not call this method directly; Flex calls it as part of performing a validation. If you create a custom Validator class, you must implement this method.

Parameters

value:Object — Object to validate.

Returns

Array — An Array of ValidationResult objects, with one ValidationResult object for each field examined by the validator.

validateNumber

()

method

public static function validateNumber(validator:NumberValidator, value:Object, baseField:String):Array

Language Version:

ActionScript 3.0

Product Version:

Flex 3

Runtime Versions:

Flash Player 9, AIR 1.1

Convenience method for calling a validator from within a custom validation function. Each of the standard Flex validators has a similar convenience method.

Parameters

	`validator:NumberValidator` — The NumberValidator instance.

	`value:Object` — A field to validate.

	`baseField:String` — Text representation of the subfield specified in the `value` parameter. For example, if the `value` parameter specifies value.number, the `baseField` value is "number".

Returns

Array — An Array of ValidationResult objects, with one ValidationResult object for each field examined by the validator.

Related API Elements

mx.validators.ValidationResult

Examples How to use this example

NumberValidatorExample.mxml

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<?xml version="1.0" encoding="utf-8"?>
<!-- Simple example to demonstrate the NumberValidator. -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/mx">

    <fx:Script>
        import mx.controls.Alert;
    </fx:Script>

    <fx:Declarations>
        <mx:NumberValidator source="{age}" property="text" integerError="Enter Integer value"
                minValue="18" maxValue="50" domain="int" 
                trigger="{myButton}" triggerEvent="click"
                valid="Alert.show('Validation Succeeded!');"
                invalid="Alert.show('Validation failed!');"/>
    </fx:Declarations>

    <s:Panel title="NumberValidator Example"
            width="75%" height="75%"
            horizontalCenter="0" verticalCenter="0">
        <mx:Form left="10" right="10" top="10" bottom="10">
            <mx:FormItem label="Enter an age between 18 and 50:">
                <s:TextInput id="age" width="100%"/>
            </mx:FormItem>
            <mx:FormItem >
                <s:Button id="myButton" label="Validate" />
            </mx:FormItem>
        </mx:Form>
    </s:Panel>

</s:Application>

NumberValidator - AS3 Flex

Classes x

allowNegative

decimalPointCountError

decimalSeparator

domain

exceedsMaxError

integerError

invalidCharError

invalidFormatCharsError

lowerThanMinError

maxValue

minValue

negativeError

precision

precisionError

separationError

thousandsSeparator