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The top portion of the function allows special keys to go through unaltered (backspace, tab, return, delete, and arrow keys). The next test determines if the character is '0' through '9' or the period. If the character fails that test, the event is prevented (same as ActionScript). If the character is valid, it is inserted into the input string and that assemblage is tested. If the string now fails a numeric test (isNaN() can take either a number or a string) the event is also prevented.

Imagine if every text input control had the ability to restrict its input just by providing some options. This more complex bead is a good example of how FlexJS allows you to build an application using only the parts you need. Having only a handful of TextInput components be able to restrict or validate their data makes for a smaller application footprint. Further, by extracting the functionality of numeric validation into a bead, the validation can be added to any text input control, such as a ComboBox, whenever needed.

Using the Bead

Updating the Manifest and Library

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