Function toggleClass

src/js/WinJS/Utilities/_ElementUtilities.js:203–251

(e, name)

        }
    }
    function toggleClass(e, name) {
        /// <signature helpKeyword="WinJS.Utilities.toggleClass">
        /// <summary locid="WinJS.Utilities.toggleClass">
        /// Toggles (adds or removes) the specified class on the specified element.
        /// If the class is present, it is removed; if it is absent, it is added.
        /// </summary>
        /// <param name="e" type="HTMLElement" locid="WinJS.Utilities.toggleClass_p:e">
        /// The element on which to toggle the class.
        /// </param>
        /// <param name="name" type="String" locid="WinJS.Utilities.toggleClass_p:name">
        /// The name of the class to toggle.
        /// </param>
        /// <returns type="HTMLElement" locid="WinJS.Utilities.toggleClass_returnValue">
        /// The element.
        /// </returns>
        /// </signature>
        if (e.classList) {
            e.classList.toggle(name);
            return e;
        } else {
            var className = getClassName(e);
            var names = className.trim().split(" ");
            var l = names.length;
            var found = false;
            for (var i = 0; i < l; i++) {
                if (names[i] === name) {
                    found = true;
                }
            }
            if (!found) {
                if (l > 0 && names[0].length > 0) {
                    setClassName(e, className + " " + name);
                } else {
                    setClassName(e, className + name);
                }
            } else {
                setClassName(e, names.reduce(function (r, e) {
                    if (e === name) {
                        return r;
                    } else if (r && r.length > 0) {
                        return r + " " + e;
                    } else {
                        return e;
                    }
                }, ""));
            }
            return e;
        }
    }

    // Only set the attribute if its value has changed
    function setAttribute(element, attribute, value) {