javascript alert and then a location replace not working

Question

I trying to use an alert message when someone enters incorrect login details, and I then want to redirect them back to the same login page. I'm doing this inside a php file that is called when someone submits a login form. I'm trying something like this:

echo '<script language="javascript">';
echo 'alert("Invalid Username or Password")';
echo 'location.replace("target.php")';
echo '</script>';

but it goes to the php file itself, which shows nothing.

Answer 1

update it you have missing ; for alert

echo '<script language="javascript">';
echo 'alert("Invalid Username or Password");';
echo 'window.location("target.php")';
echo '</script>';

Answer 2

echo '<script>';
echo 'alert("Invalid Username or Password"); ';
echo 'location.replace("http://mywebsite.com/target.php"); ';
echo '</script>';

language attribute is deprecated

location.replace("target.php") must have valid url: location.replace("http://mywebsite.com/target.php") or you can use history.back()

and as noted, don't miss semicolon