My first JavaScript

/**
 * Created by alexeyivasyuk on 8/28/14.
 */

//$(document).ready(function(){
jQuery(function($) {
    console.log('Document ready');

    $('div.btn-group[data-toggle-name=default-currency]').each(function() {
        var group   = $(this);
        var form    = group.parents('form').eq(0);
        var name    = group.attr('data-toggle-name');
        var hidden  = $('input[name="' + name + '"]', form);

        var exchGroup = $('div.btn-group[data-toggle-name=default-exchange]')
        var exchForm    = exchGroup.parents('form').eq(0);
        var exchName    = exchGroup.attr('data-toggle-name');
        var exchHidden  = $('input[name="' + exchName + '"]', exchForm);

        $('button', group).each(function(){
            var button = $(this);

            button.on('click', function(){
                var prevVal = hidden.val();
                var newVal = $(this).val()

                $('button[value='+ prevVal +']', group).removeClass('active');
                hidden.val(newVal);
                $(this).addClass('active');

                var exchangesByCurrency = [
                    [0,1,2,3,4,5], //0=Bitcoin
                    [0,1,2], //1=USD
                    [0], //2=EUR
                    [3,4] //3=CNY
                ];

                var enabledExchanges = exchangesByCurrency[newVal-0];

                var resetExchange = true;
                var curExchange = exchHidden.val();

                for (i=0; i<enabledExchanges.length; i++) {
                    var btn = $('button[value=' + enabledExchanges[i] + ']', exchGroup);
                    btn.attr('disabled', false);
                    btn.removeClass('active');

                    if (curExchange == enabledExchanges[i]) {
                        resetExchange = false;
                    };
                };

                for (i=0; i<=5; i++) {
                    if (enabledExchanges.indexOf(i) == -1) {
                        $('button[value='+ i +']', exchGroup).attr('disabled', true);
                    }
                };

                if ((newVal-0) == 0) {
                    console.log(curExchange);
                }

                if (resetExchange == true) {
                    var defExchange = enabledExchanges[0];
                    exchHidden.val(defExchange);
                    $('button[value=' + defExchange + ']', exchGroup).addClass('active');
                }
                else {
                    $('button[value=' + curExchange + ']', exchGroup).addClass('active');
                }

            });

            if(button.val() == hidden.val()) {
                button.addClass('active');
            }
        });
    });

    $('div.btn-group[data-toggle-name=default-exchange]').each(function() {
        var group   = $(this);
        var form    = group.parents('form').eq(0);
        var name    = group.attr('data-toggle-name');
        var hidden  = $('input[name="' + name + '"]', form);

        $('button', group).each(function(){
            var button = $(this);

            button.on('click', function(){
                var prevVal = hidden.val();
                var newVal = $(this).val()

                $('button[value='+ prevVal +']', group).removeClass('active');
                hidden.val(newVal);
                $(this).addClass('active');
            });

            if(button.val() == hidden.val()) {
                button.addClass('active');
            }
        });
    });
});

//window.onload = function(){
//    console.log('Window loaded');
//}

$('#signup-button').on('click', function(event) {
    console.log('Signup button pressed');
})