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MDCMenuFoundation.prototype.setEnabled = function (index, isEnabled) {
this.validatedIndex_(index);
if (isEnabled) {
this.adapter_.removeClassFromElementAtIndex(index, listCssClasses.LIST_ITEM_DISABLED_CLASS);
this.adapter_.addAttributeToElementAtIndex(index, strings.ARIA_DISABLED_ATTR, 'false');
}
else {
this.adapter_.addClassToElementAtIndex(index, listCssClasses.LIST_ITEM_DISABLED_CLASS);
this.adapter_.addAttributeToElementAtIndex(index, strings.ARIA_DISABLED_ATTR, 'true');
}
};
MDCMenuFoundation.prototype.validatedIndex_ = function (index) {