method called when drag operation initiated
source | HTMLElement | DOM element on which dnd action started |
ev | Event | native html event |
string | text which will be used in dnd placeholder, returning false or empty string will block dnd |
method not purposed for direct call! It is an extension point.
You can override it with your own logic, but be sure to check dnd related events first, as they are provide much more convinient way for dnd handling.
Back to top