function Menu_Key()

in Hands-on lab/lab-files/BigDataTravel/BigDataTravel/Scripts/WebForms/Menu.js [316:438]

• 123 lines of code
• 57 McCabe index (conditional complexity)

function Menu_Key(item) {
    var event;
    if (item.currentTarget) {
        event = item;
        item = event.currentTarget;
    }
    else {
        event = window.event;        
    }
    var key = (event ? event.keyCode : -1);
    var data = Menu_GetData(item);
    if (!data) return;
    var horizontal = Menu_IsHorizontal(item);
    var a = WebForm_GetElementByTagName(item, "A");
    var nextItem, parentItem, previousItem;
    if ((!horizontal && key == 38) || (horizontal && key == 37)) {
        previousItem = Menu_FindPrevious(item);
        while (previousItem && previousItem.disabled) {
            previousItem = Menu_FindPrevious(previousItem);
        }
        if (previousItem) {
            Menu_Focus(previousItem);
            Menu_Expand(previousItem, data.horizontalOffset, data.verticalOffset, true);
            event.cancelBubble = true;
            if (event.stopPropagation) event.stopPropagation();
            return;
        }
    }
    if ((!horizontal && key == 40) || (horizontal && key == 39)) {
        if (horizontal) {
            var subMenu = Menu_FindSubMenu(a);
            if (subMenu && subMenu.style && subMenu.style.visibility && 
                subMenu.style.visibility.toLowerCase() == "hidden") {
                Menu_Expand(a, data.horizontalOffset, data.verticalOffset, true);
                event.cancelBubble = true;
                if (event.stopPropagation) event.stopPropagation();
                return;
            }
        }
        nextItem = Menu_FindNext(item);
        while (nextItem && nextItem.disabled) {
            nextItem = Menu_FindNext(nextItem);
        }
        if (nextItem) {
            Menu_Focus(nextItem);
            Menu_Expand(nextItem, data.horizontalOffset, data.verticalOffset, true);
            event.cancelBubble = true;
            if (event.stopPropagation) event.stopPropagation();
            return;
        }
    }
    if ((!horizontal && key == 39) || (horizontal && key == 40)) {
        var children = Menu_Expand(a, data.horizontalOffset, data.verticalOffset, true);
        if (children) {
            var firstChild;
            children = WebForm_GetElementsByTagName(children, "A");
            for (var i = 0; i < children.length; i++) {
                if (!children[i].disabled && Menu_IsSelectable(children[i])) {
                    firstChild = children[i];
                    break;
                }
            }
            if (firstChild) {
                Menu_Focus(firstChild);
                Menu_Expand(firstChild, data.horizontalOffset, data.verticalOffset, true);
                event.cancelBubble = true;
                if (event.stopPropagation) event.stopPropagation();
                return;
            }
        }
        else {
            parentItem = Menu_FindParentItem(item);
            while (parentItem && !Menu_IsHorizontal(parentItem)) {
                parentItem = Menu_FindParentItem(parentItem);
            }
            if (parentItem) {
                nextItem = Menu_FindNext(parentItem);
                while (nextItem && nextItem.disabled) {
                    nextItem = Menu_FindNext(nextItem);
                }
                if (nextItem) {
                    Menu_Focus(nextItem);
                    Menu_Expand(nextItem, data.horizontalOffset, data.verticalOffset, true);
                    event.cancelBubble = true;
                    if (event.stopPropagation) event.stopPropagation();
                    return;
                }
            }
        }
    }
    if ((!horizontal && key == 37) || (horizontal && key == 38)) {
        parentItem = Menu_FindParentItem(item);
        if (parentItem) {
            if (Menu_IsHorizontal(parentItem)) {
                previousItem = Menu_FindPrevious(parentItem);
                while (previousItem && previousItem.disabled) {
                    previousItem = Menu_FindPrevious(previousItem);
                }
                if (previousItem) {
                    Menu_Focus(previousItem);
                    Menu_Expand(previousItem, data.horizontalOffset, data.verticalOffset, true);
                    event.cancelBubble = true;
                    if (event.stopPropagation) event.stopPropagation();
                    return;
                }
            }
            var parentA = WebForm_GetElementByTagName(parentItem, "A");
            if (parentA) {
                Menu_Focus(parentA);
            }
            Menu_ResetSiblings(parentItem);
            event.cancelBubble = true;
            if (event.stopPropagation) event.stopPropagation();
            return;
        }
    }
    if (key == 27) {
        Menu_HideItems();
        event.cancelBubble = true;
        if (event.stopPropagation) event.stopPropagation();
        return;
    }
}