Function isElementTabbable

docs/app/js/sanddance-app.js:24672–24685

(element, checkTabIndex)

    element.isVisible === true; // used as a workaround for testing.
}
function isElementTabbable(element, checkTabIndex) {
    // If this element is null or is disabled, it is not considered tabbable.
    if (!element || element.disabled) return false;
    var tabIndex = 0;
    var tabIndexAttributeValue = null;
    if (element && element.getAttribute) {
        tabIndexAttributeValue = element.getAttribute("tabIndex");
        if (tabIndexAttributeValue) tabIndex = parseInt(tabIndexAttributeValue, 10);
    }
    var isFocusableAttribute = element.getAttribute ? element.getAttribute(IS_FOCUSABLE_ATTRIBUTE) : null;
    var isTabIndexSet = tabIndexAttributeValue !== null && tabIndex >= 0;
    var result = !!element && isFocusableAttribute !== "false" && (element.tagName === "A" || element.tagName === "BUTTON" || element.tagName === "INPUT" || element.tagName === "TEXTAREA" || element.tagName === "SELECT" || isFocusableAttribute === "true" || isTabIndexSet);
    return checkTabIndex ? tabIndex !== -1 && result : result;
}
function isElementFocusZone(element) {
    return !!(element && element.getAttribute && !!element.getAttribute(FOCUSZONE_ID_ATTRIBUTE));
}