jquery: serializeObject

gistfile1.js

    $.fn.serializeObject = function(){
        var o = {};
        var a = this.serializeArray();

        $.each(a, function() {
            if (o[this.name] !== undefined) {
                if (!o[this.name].push) {
                    o[this.name] = [o[this.name]];
                }
                o[this.name].push(this.value || '');
            } else {
                o[this.name] = this.value || '';
            }
        });
        return o;
    };

    $(function() {
        $('#demo-form').submit(function() {
            $('#output-demo-from').html(JSON.stringify($(this).serializeObject(),null,'\t'));
            $(this).next().removeClass('hidden');
            return false;
        });
    });