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Variables..


Karlos
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Well I finally decided to learn JavaScript.. But I ran into a few problems along the way and now I'm confused...

Well I decided to use x as my variable but it says on w3schools I need to clear the variable before I can re-assign it to a new value.

Well here's my script what I got:

 

<?php
require_once (DIRNAME(__FILE__) . '/globals.php');
?>

<script type="text/javascript">
<!--

var x = 5;
if (x == 4)
{
document.write("Wrong!");
}
else
{
document.write("Correct!");
}
var x;

document.write("

");

var x = 5;
if (x == 5);
{
document.write("I'm learning");
}
else
{
document.write("Or not....");
}
var x;

//-->
</script>

<?php
$h->endpage();
?>
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Re: Variables..

Well in the end I still had no luck...

So I decided to play around and work with simple arithmetic and if statements and this is what I got..

But i still would like to find the answer out if anybody can help me..

 

<?php
require_once (DIRNAME(__FILE__) . '/globals.php');
?>


<script type="text/javascript">
<!--

var x;
x = 5;
if (x == 4)
{
document.write("X Doesn't Equal 4");
}
else
{
document.write("X Equals 5");
}

document.write("
");

var y;
y = 10;
if (y == 10)
{
document.write("Y Equals 10");
}
else
{
document.write("Y Doesn't Equal 10");
}

document.write("
");

var z;
z = x + y;
if (z = 15)
{
document.write("Z Equals 15...Simple Arithmetic");
}
else
{
document.write("What Planet Are You On....Z Equals 15... -.-");
}

document.write("
");

if (z >= 16)
{
document.write("Z Equals 15...Simple Arithmetic");
}
else
{
document.write("What Planet Are You On....Z Equals 15... -.-");
}


//-->
</script>

<?php
$h->endpage();
?>
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Re: Variables..

 

but it says on w3schools I need to clear the variable before I can re-assign it to a new value.

I'm not sure what w3 was talking about there, but using the keyword "var" multiple times on the same variable does nothing.

It has a special use within functions/objects to set scope, but within the same scope, it's doing nothing for you to use var more than once.

var x = 1;

 

x = 2;

x = 3;

alert(x);

 

--------------

You'll see the alert pop up with "3".

 

hope that helps.

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Re: Variables..

Well as I said I'm learning JavaScript for the first time so I'm not to sure on some stuff and w3schools doesn't explain it a lot in detail but thanks Floydian it helped and my final crappy out come was: (But i hoepfully will learn it better and make more and better scripts in the future.)

<?php
require_once (DIRNAME(__FILE__) . '/globals.php');
?>


<script type="text/javascript">
<!--

var x;
x = 5;
if (x == 4)
{
document.write("X Doesn't Equal 4");
}
else
{
document.write("X Equals 5");
}

document.write("
");

x = 11;
if (x == 9)
{
document.write("X Doesn't Equal 9");
}
else if(x == 11)
{
document.write("X Equals 11");
}
else
{
document.write("X Equals A Number You Dooofus!");
}

//-->
</script>

<?php
$h->endpage();
?>
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