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Check textbox in interactive grid for numeric if lost focus

KlaBaOct 8 2020

Is it possible in a interactive grid to check a textbox for numeric if lost focus?
At the moment this check is carried out with the validation process (is_numeric) when saving, but the user would like to carry out the check immediately when leaving the field.
Can I use Javascript here and what should it look like?
Kindly regards
Klaus

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Added on Oct 8 2020
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