phone number formatting in client side while entering number in flex

in my flex application i want to ke开发者_JAVA百科ep a format like... i want to show space in client side while entering phone numbers.. After entering three numbers cursor should leave a space...

for eg:- 111 111111

is there any idea to work this in CLIENT SIDE itself

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You can use Masked TextInput component. More info is here.

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You should be able to work something out using the mx:PhoneFormatter (which can be customized to match whatever pattern you'd like): http://livedocs.adobe.com/flex/3/html/help.html?content=formatters_2.html

<mx:PhoneFormatter formatString="### ######" />

Perhaps replace the contents of the input field with the PhoneFormatted version onKeyUp.