the method is called when a drag operation is initiated

string $drag(HTMLElement source,Event ev,string pointer);
sourceHTMLElementa DOM element on which a dnd action has started
evEventa native HTML event
pointerstringdefines what pointer started dnd
stringa text which will be used in a dnd placeholder, returning false or an empty string will block dnd

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The method is not purposed for direct call! It is an extension point.

You can override it with your own logic, but check drag-n-drop related events first, as they provide a much more convenient way for drag-n-drop handling.

Pointer has two states: "mouse" and "touch".

See also
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