Custom dropdown with form / input management

function DropDown(el) {
    this.dd = el;
    this.placeholder = this.dd.children('span');
    this.opts = this.dd.find('ul.dropdown > li');
    this.val = '';
    this.index = -1;
    this.initEvents();

    // Prepare Form / input selection
    var $input = $('input[name="' + this.dd.children('ul').attr('data-target') + '"]');
    var $form = this.dd.parents('form');

    // Check if the form exist
    if ($form.length) {
        if (!$input.length) {
            $input = $('<input type="hidden" name="' + this.dd.children('ul').attr('data-target') + '" value="" />');
            $input.appendTo($form);
        }
    }

    this.input = $input;
}

DropDown.prototype = {
    initEvents : function() {
        var obj = this;

        obj.dd.on('click', function(event){
            $(this).toggleClass('active');
            return false;
        });

        obj.opts.on('click',function(e){
            var opt = $(this);
            obj.val = opt.text();
            obj.index = opt.index();
            obj.placeholder.text(obj.val);


            if (obj.input) {
                obj.input.attr('value', $(this).attr('data-id'));
            }
        });
    },
    getValue : function() {
        return this.val;
    },
    getIndex : function() {
        return this.index;
    }
};