JavaScript Validation?

[techno_race]

And I take it that if it's 10:21, it writes '4,' not 'in 4 minutes.' Is that right?

[techno_race]

Aye. Everything was thinking that I wanted the page to refrech the page every nanosecond . Does that refresh every minute? Or can I even do it in the script? Do I need the <meta http-equiv="refresh"> tag?

[Twey]

var leaves = (function(x) { var v = x % 5; return (v === 0 ? 0 : 5) - v; })((new Date()).getMinutes());

Sorry, that's kind of advanced... it creates an anonymous function (one without a name), then calls it with the current minutes as an argument. It's equivalent to:

function f(x) {
  var v = x % 5;
  if(v === 0)
    return v;
  else
    return 5 - v;
}

var d = new Date();
var leaves = f(d.getMinutes());

... but obviously much shorter.

window.location.href = (leaves === 0 ? "shuttle.html" : "index.html");

This is an example of the tertiary operator.

var a = b ? c : d;

is equivalent to:

var a;
if(b)
  a = c;
else
  a = d;

Is there any way to make that update every minute...or does it already?

No, it doesn't. Since the user is redirected immediately, there's no point... oh. Now I see what you were attempting with location.href = "index.html". Don't do this. Instead, try something like:

<p>Welcome to SGB Airport.  Next shuttle leaves in <span id="nextshuttle">?</span>.</p>

<script type="text/javascript">
  var leaves = (function() { var v = (new Date()).getMinutes() % 5; return (v === 0 ? 0 : 5) - v; })();

  function updateMinutes() {
    var l = leaves();
    document.getElementById("nextshuttle").firstChild.nodeValue = l + (l === 1 ? " minute" : " minutes");
  }
  setInterval(updateMinutes, 60000);
</script>

I never learned what an array was, all I learned was if...else and switch.

Arrays are vital in Javascript.

And I take it that if it's 10:21, it writes '4,' not 'in 4 minutes.' Is that right?

No. What lead you to that conclusion?

Everything was thinking that I wanted the page to refrech the page every nanosecond . Does that refresh every minute? Or can I even do it in the script? Do I need the <meta http-equiv="refresh"> tag?

Ugh! The original doesn't, but the one above will update the time every minute. You don't need <meta>.

[techno_race]

Yeah. I think the cause of the refreshing was

else {
window.location="index.html"
}

It should have been

else {
}

[Twey]

Yes, I said this. It should, in fact, have been:

[techno_race]

Except now I get 'Welcome to SGB Airport. Next shuttle leaves in ?. ..'

[Twey]

Not if you wait a minute You want to call it once first:

<p>Welcome to SGB Airport.  Next shuttle leaves in <span id="nextshuttle">?</span>.</p>

<script type="text/javascript">
  var leaves = (function() { var v = (new Date()).getMinutes() &#37; 5; return (v === 0 ? 0 : 5) - v; })();

  function updateMinutes() {
    var l = leaves();
    document.getElementById("nextshuttle").firstChild.nodeValue = l + (l === 1 ? " minute" : " minutes");
  }

  setInterval(updateMinutes, 60000);
  updateMinutes();
</script>

[techno_race]

Wait. I think you should see this:

I opened it in Firefox w/ Firebug ang got this message.

[Twey]

... what message?

ImageShack doesn't like me.

[techno_race]

And it throws 4 more of those every minute.