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How to know if an object is a File or a Folder ?

Mar 29, 2013 6:13 AM

Hello again,


I am looking for an easy method to determine whether a File or Folder object point to an actual file or to a folder. Both objects seem to have the same set of properties, except the File element has more. But the Data Browser in the ESTK refuses to show the contents of a File object when I have not actively retrieved the properties yet. Is this simply a matter of testing whether a file-related property exists in the object? Is there another, more elegant method, an undocumented feature, for instance a property IsFolder or something similar ?





  • Currently Being Moderated
    Mar 29, 2013 12:01 PM   in reply to 4everJang

    Hi Jang,


    This from Chapter 3 of the JavaScript Tools Guide:


    There are several ways to distinguish between a File and a Folder object. For example:

    if (f instanceof File) ...

    if (typeof == "undefined") ...// Folders do not open

    File and Folder objects can be used anywhere that a path name is required, such as in properties and arguments for files and folders.



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  • Currently Being Moderated
    Apr 3, 2013 1:49 AM   in reply to frameexpert

    If you simply want to check, if the file/folder object you created points to a file/folder on your computer, maybe this might work:


    if (File.exists) ...


    if (Folder.exists) ...



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