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Validation of text input in the form

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Posted on by stribor45

6

I have border thickness property set to (see below) and it works fine but it also gets activated when I preview the app. How to avoid this?

If(
    !IsMatch(DataCardValue3.Value, "^[A-Z]{3} [0-9]{3}[A-Z]$"),
    3,
    1
)

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Validation of text input in the form

@stribor45 Hi,

Assume that when preview, the text is empty.

Power Apps will treat a blank (“”) input as non‐matching, so the thicker border (3) shows up immediately—e.g. even when you just hit Preview and haven’t typed anything yet.

consider below code ( as your reference),

If( IsBlank(DataCardValue3.Text), 1, /* default border when empty */ If( !IsMatch(DataCardValue3.Text, "^[A-Z]{3} [0-9]{3}[A-Z]$"), 3, /* invalid pattern → thick border */ 1 /* valid pattern → normal border */ ) )

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