Use NumberValidator to check negative value : NumberValidator « Data Model « Flex

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Flex » Data Model » NumberValidator Screenshots  Use NumberValidator to check negative value    <?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">     <mx:NumberValidator source="{age}"                          property="text"                         allowNegative="false"                         negativeError="negative value"                          minValue="5"                         maxValue="10"                          domain="int"                          trigger="{submitButton}"                         triggerEvent="click" />     <mx:Text text="Enter your age:" />     <mx:TextInput id="age" />     <mx:Button label="Submit" id="submitButton" /> </mx:Application>             Related examples in the same category 1. NumberValidator used to check a value and if the number is an integer 2. Check integer value range with NumberValidator 3. Set domain of value to check to int for NumberValidator 4. Set minimum and maximum values of a NumberValidator 5. Using the NumberValidator class 6. Config NumberValidator With data Binding 7. Using NumberValidator class to ensure that an integer is between 1 and 10