Dom events

Hi i explain my issue, i have 2 equal contact form in 2 different pages and i will create others to put in others pages. So, I entered the following code in header.php

<script>
document.addEventListener( ‘wpcf7mailsent’, function( event ) {
location = ‘/thankyoupage’;
}, false );
</script>

and redirection runs only with the contact form in contact page. I dont know why!!

Than I replaced the previous code with the following

<script>
document.addEventListener( ‘wpcf7mailsent’, function( event ) {
if ( ‘123’ == event.detail.contactFormId ) {
location = ‘/thankyoupage’;
}
}, false );
</script>

than the contact form that’s in contact page doesnt run as the second contact form that have 123 as id.

I tried the same in footer.php and nothing is changed.

Could someone please help me?