In our last article I filled your puny brain with the knowledge of JavaScript operators. In this article we are going to learn about pop-up boxes. That's right, those sometimes annoying, sometimes helpful things that leap out at the user and ask them to do stuff will be covered here.
If you want to give a user an option, you can use the Confirm Box. The user will have the choice of saying OK or Cancel. Here it is in code:
<html>
<head>
<script type="text/javascript">
function disp_confirm()
{
var r=confirm("Choose Wisely")
if (r==true)
{
document.write("Oh No! Now you did it!")
}
else
{
document.write("You canceled your paycheck!")
}
}
</script>
</head>
<body>
<input type="button" onclick="disp_confirm()" value="Click Me Fool" />
</body>
</html>
You will notice a few new things in the above example. Don't fret about those too much for now. First, we added a Function, which we will hopefully learn to do later in this tutorial. We also added a button to the page as well, that says: Click Me Fool.
This particular Confirm Button doesn't trigger when the page loads, although it could. Instead, we use our Click Me Fool button to have the user trigger it. When they click it the following pop-up appears:
If the user clicks OK, it will print the following to the screen:
Oh NO! Now you did it!
If the user clicks the CANCEL button, the following prints to the page:
You canceled your paycheck!
The confirm button relies on a boolean value stored in a variable called r. If the user clicks on the OK (or true), it does one thing, if they choose CANCEL (or false) it does another.
You can also do this with a page load instead of having the user click on a button:
JavaScript 
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OnReset, OnResize and Other JavaScript Events
