Let the user input only alphabet and numbers

While designing the FORM, the designer wants to force the user to input only alphabet and numbers For example , in a User Name input field, the user dont need to press $,# ,%,{,},[,] etc keys while while entering data. Therefore, if the form is designed in the way, that if users  intentionally or unitentionally press those Keys, it will not refelect in the textbox. Now, how can we do that,

A simple javascript using regular expression we can do that in “onkeypress” or “onkeydown” event .

To know more with a live demonstration, you can go to this link,

http://amar-desh.net/myworks/javascript/alphanumeric.aspx

If you find any difficulties or if you know more better aprroach, share it here.

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