Checking that an item is selected in the Spark DropDownList control in Flex 4

By On March 12, 2010 · 1 Comment

The following example shows how you can check whether the user has selected an item in the Spark DropDownList control in Flex 4 by setting the Boolean requiresSelection property to true or using a NumberValidator to check the DropDownList control’s selectedIndex property is greater than -1.

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Validating negative numbers using the NumberValidator in Flex

By On August 31, 2008 · Leave a Comment

The following example shows how you can prevent or allow negative numbers when using the NumberValidator class by setting the Boolean allowNegative property.

Full code after the jump.

 

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Validating integers using the NumberValidator class

By On August 30, 2008 · 13 Comments

The following example shows how you can validate a number as an integer or real (floating point) number by setting the domain property on a NumberValidator instance.

Full code after the jump.

 

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Programmatically opening and closing ComboBox controls in Flex

By On December 13, 2007 · Leave a Comment

The following examples show how you can programmatically open and close a ComboBox control’s drop down menu in Flex by using the open() and close() methods of the ComboBox class in Flex.

Full code after the jump.

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