how to scan input characters in java script??

[coolvsan]

Plz help...

I want to allow user to enter only valid characters which are allowed over SMS network. problem is i dont want to allow it any way i.e either by typing or through paste action. how can i scan input characters??

[Dormilich]

you validate the characters when the user leaves the input field (onblur) or when the input value is changed (onchange).