Client-side form validation is an important part of a web site where data needs to be collected from the user. Users are innately ignorant, and will mess up data entry in a web form if given the chance. This is one of life's few, succinct truisms. It i s
Looking for an iron-clad way of restricting the amount of input in certain form elements of your page (ie: the credit card or area code field)? Look to this script
While validating input data on the server is essential, using JavaScript to validate data on the client as well is both simple to do and user-friendly. In this excerpt we examine a client-side function that tests the validity of a credit card number
