I write PHP inside JS in the following way
alert();
echo__(\"Error-login\")
correlates with
You are missing quotes in the alert()
call.
alert('<?php echo __("Error-login") ?>');
Your line becomes
alert(Error-login);
As you can see, you are missing the quotes:
alert('Error-login');
If somebody uses quotes in the translation, this will also generate an error:
alert('Error's are here');
So you need to escape single quotes before you pass it to Javascript.
try this
<?php echo '<script language="javascript">confirm("Do you want this?")</script>;'; ?>