-2
It shows this error because it got to before the user even clicked on "Barcode", where it is redirected to the app to perform the barcode Cód reading. After it reads, the error disappears and the barcode is filled normally.
Only take out this error by placing $_GET only after user read the Cód bar
-1
You must use isset(), where it checks whether the variable was started.
Your code would look something like:
<?=isset($_GET['codigo']) ? $_GET['codigo'] : '';?>
Being false, does not return a Warning.
It worked buddy! you’re great! you can force a enter by php once it is filled?
Yes, it is possible. An example here https://answall.com/questions/114809/como-enviar-um-formul%C3%A1rio-automatically-when-the-inputs-are-filled
Opa, here it didn’t work because mine is only an input. it doesn’t have a form and neither Submit :(
What is the function of "enter"? Send what? Where? Anything opens a new question.
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You are confusing concepts, to generate this screen on the server side, will execute the PHP code, so by sending to the browser you will have already run $_GET
– Ademir Mazer Jr - Nuno
yes, how do I run GET only after the user reads the code? I want to leave blank by default
– Humberto Constantino