Open popup in a new window by clicking a button in Javascript Alert

I'm using this code:

  <script type="text/javascript">
window.alert("Click Ok If Over 18");
window.open(
  '.html', 
  '_blank' // <- This is what makes it open in a new window.
);
</script>

I need to add this code for open a popup in new window:

<script type='text/javascript' src='address popup'></script>

If I add it in this way:

<script type="text/javascript">
window.alert("Click Ok If Over 18");
window.open(
  'address popup', 
  '_blank' // <- This is what makes it open in a new window.
);
</script>

It doesn't open as expected. I see only text. Maybe it's because I did not use src:. What I can do?

Solution

The first parameter of window.open() needs to be the URL of the page you want to open in the popup.

Rather than using an alert, sounds like you should use a confirm. Alert doesn't actually allow the user to say they aren't 18; even if they close the alert instead of hitting "ok", it'll still continue to open your pop-up. But confirm() gives them an "ok" button and a "cancel" button, so they can choose.

So altogether, here's what your code might look like:

<script type="text/javascript">
var isEighteen = window.confirm("Click Ok If Over 18");
if (isEighteen) { // if they clicked "ok"
    window.open(
      'http://example.com/popup-is18.html', 
      '_blank'
    );
} else { // if they clicked "cancel"
    window.open(
      'http://example.com/popup-not18.html', 
      '_blank'
    );
}
</script>

It looks like you were trying to include the JavaScript from another file. If you did that, you'd want to put everything inside of the script tag above into a file, some_name_you_can_make_up.js, and then do this:

<script type="text/javascript" src="http://example.com/some_name_you_can_make_up.js"></script>