onBeforeFolderToggle

fires before a tree branch will be opened or closed (the Timeline view, 'tree' mode only)

section	object| boolean	the configuration object of the branch to open/close. Takes the true value, if all branches will be closed/opened at once by the closeAllSections()/openAllSections() methods.
isOpen	boolean	indicates whether the branch will be opened (true) or closed (false)
allSections	boolean	takes the true value, if all tree branches will be closed/opened at once by the closeAllSections()/openAllSections() methods, false - if only one branch will be opened/closed.

boolean

defines whether the default action of the event will be triggered (true) or canceled (false)

Available only in PRO Edition

Example

scheduler.attachEvent("onBeforeFolderToggle", function(section,isOpen,allSections){
    //any custom logic here
    return true;
});

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