var someWidget = {
    init: function(container){
        this.container = container;

        $(this.container).addEventListener('click', this.onItemClick);
    },

    dispose: function(){
        $(this.container).removeEventListener('click', this.onItemClick);
    }

    onItemClick: function(e){
        if(e.target.classList.contains('item')){
            //some processor
        }
    }
}