Javascript code for validating form

If it has not been submitted, skip the validation and display a blank form.However, in the example above, all input fields are optional.The HTML form we will be working at in these chapters, contains various input fields: required and optional text fields, radio buttons, and a submit button: The validation rules for the form above are as follows: This code adds a script tag and an alert command.

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[a-z] : It matches characters from lowercase ‘a’ to lowercase ‘z’. If by mistake, user skips entering any detail, soon the alert message appear on the form.

escaping - by -) [0-9] : It matches digital number from 0-9. That means, you could be very sure about the form, whether users have entered the details or not.

function length Define(inputtext, min, max) // Function that checks whether a option is selected from the selector and if it's not it displays an alert message.

function true Selection(inputtext, alert Msg) // Function that checks whether an user entered valid email address or not and displays alert message on wrong email address format.

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.

To check, whether the user entered correct form of data, it’s must to apply form validation in any of the form. The expression is: /^[a-z A-Z] $/ The above expression checks whether the input characters in the string is alphabet or not.

Here I am giving you the form validation codes in Java Script. These are simple meta characters which do pattern matching. If the entered characters in the field is not in lower case or upper case. When it’s about checking contact field or zip code field, one need to check whether only the number have been entered or not.

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-.

This is just a simple and harmless example how the PHP_SELF variable can be exploited.

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