ElementClassTest.js

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/* Test if an element has a certain class
 * Description: Uses regular expressions and caching for better performance.
 * Maintainers: User:Mike Dillon, User:R. Koot, User:SG
 */

var hasClass = (function() {
    var reCache = {};
    return function(element, className) {
        return (reCache[className] ? reCache[className] : (reCache[className] = new RegExp("(?:\\s|^)" + className + "(?:\\s|$)"))).test(element.className);
    };
})();