Pre-filter incompatible items in a file picker



  • I'm implementing a file picker to let users pick a simple textual file.
    The prerequisite is the file must be writable.

    enter image description here

    However, a user might input the file's path by hand too.

    enter image description here

    Should I filter out the non-writable files in the dialog already?
    The downside is that would result in a duplicated validation.



  • It would be better to show the files as disabled than to filter them out altogether; if they don't show at all, the user might wonder if it's an OS issue vs. something your system is doing deliberately. Disabled files communicate, "Our system can't use this file."


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