Validating user input with javascript

Checking for form completion: The first step of form validation is to check, whether the user have entered information in all the fields or not.

If the string value is numeric, it will return true, otherwise it will return false.

Flowchart: Here is the entire Java Script used for validation of the form.

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: file_download Download the validation code from here.

In this document, we have discussed Java Script Form Validation using a sample registration form.

The tutorial explores Java Script validation on submit with detail explanation.

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The expression for matching numbers and characters in the field is: /^[0-9a-z A-Z] $/ It’s must to provide validation in the select field.

So, just to make sure that user entered the email address in the correct format, it’s necessary to include email validation code inside the validation codes.

A general expression to check valid email address is: /^[w-.

Validation codes will return an alert message, if it finds some empty fields in the form.

If an user miss out any field, than the form will display error message.

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