jQuery :data(#{selector}) expression

gistfile1.js

// Use:
// <input type="checkbox" data-accordion=".additional" />
// $(":data(accordion)").change(doSomething);

$.extend($.expr[":"], {
  data: function(el, idx, selector) {
    var attr = "data-" + selector[selector.length - 1];
    return el.hasAttribute(attr);
  }
});