JavaScript function to manipulate an Element's dataset/data-* attributes (detects native browser support)

element-dataset.js

var DataSet = (function () {
    "use strict";

    var E, toCamelCase, getter, setter;

    E = document.createElement("div");

    if (E.dataset && !E.hasOwnProperty("dataset")) {
        toCamelCase = (function () {
            var re = /-([a-z])/g;
            return function (str) {
                str = str.replace(re, function (match, lower) {
                    return lower.toUpperCase();
                });
            };
        }());
        getter = function (element, key) {
            return element.dataset[toCamelCase(key)];
        };
        setter = function (element, key, value) {
            element.dataset[key] = value;
        };
    } else {
        getter = function (element, key) {
            return element.getAttribute("data-" + key);
        };
        setter = function (element, key, value) {
            element.setAttribute("data-" + key, value);
        };
    }

    return {
        "get": getter,
        "set": setter
    };
}());