I have a list of validation requirements for password strength to help users set their passwords, and it's broken into parts so that I can mark each requirement as 'valid' once the user has inputted a valid value in the password input box. (So if they put in a password longer than 7 characters, the password length requirement notice turns green etc). This is working great. 

Now, I want to say, if all of the 'if' statements are valid, allow the form to be submitted, otherwise, don't. After reading around, I've made a few attempts at achieving this by setting a variable retVal = true but I'm not quite sure how to use that so have failed in my attempts so far. I also considered doing something like, if all the requirements have the class valid, then allow form submit but that didn't seem like the correct way?

```
$('#form-password-change #input-password').keyup(function() {

    // set password variable

    var pwd = $(this).val();

    // validate the length

    if (pwd.length > 7) {
        $('#length').removeClass('invalid').addClass('valid');
    } else {
        $('#length').removeClass('valid').addClass('invalid');
    }

    // RegExp
    // validate letter

    if ( /([^a-z]*[a-z]){3,}/i.test(pwd) ) {
        $('#letter').removeClass('invalid').addClass('valid');
    } else {
        $('#letter').removeClass('valid').addClass('invalid');
    }
});

```