A simple algorithm, in Corvid

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@gemats

if ($w('#text457').text==="") {$w('#mybutton.disable'}
else {$w('#mybutton.enable'}

other one could be…

if ($w('#text457').text===null) {$w('#mybutton.disable'}
else {$w('#mybutton.enable'}

other one could be…

if ($w('#text457').text===0) {$w('#mybutton.disable'}
else {$w('#mybutton.enable'}

or if you work with input-fields…

if ($w('#input1').value==="") {$w('#mybutton.disable'}
else {$w('#mybutton.enable'}