This tutorial will show you how to create a Java Script-enabled form that checks whether a user has filled in the form correctly before it's sent to the server. First we'll explain why form validation is a useful thing, and then build up a simple example form, explaining things as we go along.For the sake of demonstration, we have taken five countries only. function form Validation() function userid_validation(uid,mx,my) function passid_validation(passid,mx,my) function all Letter(uname) function alphanumeric(uadd) function countryselect(ucountry) function allnumeric(uzip) function Validate Email(uemail) function validsex(umsex,ufsex) Flowchart : Download the Validation code from here.Shows you how to write a script that ensures your form is filled in correctly before it's sent to your server.The later Java Script function created is called on the onsubmit event of the form. If Male or Female is selected, it generates an alert saying that the form is successfully submitted and it reloads the form.is the external Java Script file which contains the Java Script ocde used to validate the form. Notice that for validation, the Java Script function containing the code to validate is called on the on Submit event of the form. Flowchart : Here is the entire Java Script used for validation of the form.