Simple Custom Email Validation (JavaScript)

Simple Custom Email Validation (JavaScript)

14:22

Description:    The following validateEmail() JavaScript function checks whether an email address is valid or not. It takes the email address from an input tag with ID="Email" and performs the following checks on it.

            i) Checks the presence of '@'character

           ii) Checks the presence of at least one letter (A-Z or a-z) right                    after the @'character

          iii) Checks the presence of ".com" 

JavaScript Code

function validateEmail() {

    

     document.getElementById('Email').value;

     length = email.length;

     for (i = 0; i < length; i++) {

           if (email[i] == '@')

                break;

     }

     if (i != length) {

           i++;

           if ((email[i] < 'A' || email[i] > 'Z') && (email[i] < 'a' || email[i] > 'z'))

                return false;

           else {

                com = ".com";

                     for (i; i < length; i++) {

                           for (j = 0, k = i; j < 4; j++, k++)

                                if (email[k] != com[j])

                                     break;

                           if (j == 4)

                                break;

                     }

                if (i != length)

                     return true;

                else

                     return false;

           }

     }

     else

           return false;

}