These docs are for an old release.
Info on upgrading to version 2/3
selectHelper 1.4.6
Whether to draw a “placeholder” event while the user is dragging.
Boolean/Function, default: false
This option only applies to the agenda views.
A value of true will draw a “placeholder” event while the user is dragging (similar to what Google Calendar does for its week and day views). A value of false (the default) will draw the standard highlighting over each cell.
A function can also be specified for drawing custom elements. It will be given 2 arguments: the selection’s start date and end date (Date objects). It must return a DOM element that will be used.