$(document).ready(function() {
    $('#password').keyup(function() {
        $('#result').html(checkStrength($('#password').val()))
    })

    function checkStrength(password) {
        var strength = 0
        var re = /^[a-z0-9\-]+$/i
        var result = re.test(password)
        if (result) {
            $('#result').removeClass()
            $('#result').addClass('short')
            return 'Use alphanumeric characters for stronger passwords'
        }

        if (password.length < 6) {
            $('#result').removeClass()
            $('#result').addClass('short')
            return 'Too short'
        }
        if (password.length > 7)
            strength += 1
            // If password contains both lower and uppercase characters, increase strength value.
        if (password.match(/([a-z].*[A-Z])|([A-Z].*[a-z])/))
            strength += 1
            // If it has numbers and characters, increase strength value.
        if (password.match(/([a-zA-Z])/) && password.match(/([0-9])/))
            strength += 1
            // If it has one special character, increase strength value.
        if (password.match(/([!,%,&,@,#,$,^,*,?,_,~])/))
            strength += 1
            // If it has two special characters, increase strength value.
        if (password.match(/(.*[!,%,&,@,#,$,^,*,?,_,~].*[!,%,&,@,#,$,^,*,?,_,~])/))
            strength += 1
            // Calculated strength value, we can return messages
            // If value is less than 2
        if (strength < 2) {
            $('#result').removeClass()
            $('#result').addClass('weak')
            return 'Weak'
        } else if (strength == 2) {
            $('#result').removeClass()
            $('#result').addClass('good')
            return 'Good'
        } else {
            $('#result').removeClass()
            $('#result').addClass('strong')
            return 'Strong'
        }
    }
});