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

        $(this.container).on('click', '.item', this.onItemClick);
        // https://api.jquery.com/on/
    },

    dispose: function(){
        $(this.container).off('click', '.item', this.onItemClick);
        // https://api.jquery.com/off/
    }

    onItemClick: function(){
        //some processor
    }
}