Set a required upload button valid (Forms)

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1

Hey,
I coded my own form page. I want to set a required UploadButton valid.

For textboxes I use this code:

 let TB2 = $w("#textBox2").required = true;
 
 if (!$w("#textBox2").valid) {
        $w("#errorTB2").expand();
    } else {
        $w("#errorTB2").collapse();
    }

But how can I use this for an UploadButton ?

I tried this code, but it doesn’t work:

let Upload7= $w("#uploadButton7").required = true;

 if (!$w("#uploadButton7").valid) {
        $w("#errorUload7").expand();
    } else {
        $w("#errorUload7").collapse();
    }
2

$w ( “#uploadButton7” ). required = true ; //why do you use let Upload7= ?

3

Without “let” the code doesn’t work.

 if (!$w("#uploadButton7").valid) {
        $w("#errorUload7").expand();
    } else {
        $w("#errorUload7").collapse();
    }

In this part of the code, I want to expand/collapse an error Message, if the field isn’t valid/ is valid.

When I use textboxes, the field is valid, if it has a value.
What should I use for uploadButtons ?

4

Use this code:

 if ($w("#uploadButton11").value.length === 0) {
        $w("#FehlerBildLogo").expand();
    } else {
        $w("#FehlerBildLogo").collapse();
    }