Prevent dropping at first root level item

[jasonvarga]

Hello.

I am trying to prevent nodes being dragged to the top of the tree.

I tried the following, but it doesn't work since targetInfo is undefined.

rootDroppable(stat) {
    return dragContext.targetInfo.indexBeforeDrop === 0;
}

[phphe]

targetInfo is not undefined untill mouseup, check #128, try dragContext.closestNode

[jasonvarga]

I saw that issue and noticed dragContext.closestNode was also undefined. But I was still on 2.8.2. Upgrading to 2.9.4 fixed that.

I was able to prevent dragging to the top node by doing if (dragContext.closestNode === null) return false;.

Thanks!