Forum Discussion

MikeP's avatar
MikeP
New Contributor II
4 years ago

How do we check if NO DATA in a CSV file after filtering out headers

Hello, I need to check if there is no actual data after reading and parsing a CSV file, I am using the CSV Parser and have checked the ‘Contains Header’ (as we will always have a row with headers), I...
MikeP's avatar
MikeP
New Contributor II
4 years ago
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hi j.evegelvski, sorry for delayed reply.

I think I sussed it now.

!$.isEmpty() although no errors syntactically on setting it in the expression validation, it doesn’t seem to functionally work.

However, $.isEmpty() == false, the more explicit syntax, does work, therefore the router flow now conforms as expected.

Thanks for your assistance!

j_angelevski's avatar
j_angelevski
Contributor III
4 years ago
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@MikeP,

Glad that it is working now. But the reason why !$.isEmpty() doesn’t work it’s because:

  • When the input is empty - {}, the expression !$.isEmpty() will return false because you are checking first if the input is empty ( which is true ) but you are making it false ( with the ! sign ) and in the end the Router won’t output anything. It’s essentially like saying "Check if input is empty, and if it is, stop the flow of the data ( which in this case it should continue to another output instead of stopping )."
  • You can also solve this with the following Router settings

    The first expression will return true if the input data is not empty ( it will output the input data to the first output view ), and the second expression will simply return true and will output the data on the second output view. With the First match option checked, only the first expression that returns true will be evaluated to the output even if there are more expressions that return true.