Previous Example-|-Next Example-|-Return to Chapter Listing
Example 13.9
Is Java Enabled? Using navigator.javaEnabled
[This example works with Netscape Navigator 3 and 4. (Though not with all of the preview release of Navigator 4; in 4b3, for instance, navigator.javaEnabled() always returns true, regardless of the browser's actual condition.) It will not work in Internet Explorer 3.]
This page uses the navigator.javaEnabled() method to see if your browser is Java-enabled. If it is, you'll see the earlier Java example. If not, you'll see an alert box.
Welcome to Tickets Online!
Kludge Kowboys in Concert, only $50.00 per ticket.
Please enter number of tickets desired:
|
We have this in the HEAD:
<![CDATA[
<SCRIPT LANGUAGE="JavaScript">
<!--
var sAddJava = "<FORM NAME='myform'><INPUT TYPE='text' SIZE='10' NAME='numTickets'><INPUT TYPE='button' VALUE='Click to Order' onclick='document.ticket.setTicketQuantity(document.myform.numTickets.value)'></FORM></td><td><APPLET NAME='ticket' CODE='ticket.class' WIDTH=300 HEIGHT=200 mayscript></APPLET>"
function javaYes() {
document.write(sAddJava)
}
function javaNo() {
alert("Your browser doesn't have Java enabled, so you can't run the Java app associated with this page. Either you have a non-Java browser, or Java is disabled in your browser's properties.)")
document.write("<b>[The form and Java applet go here in a Java-enabled browser.]</b>")
}
function message(msg1, msg2) {
alert(msg1 + msg2)
}
// -->
</SCRIPT>
]]>
Then this form in the BODY:
<![CDATA[
<table border="0" width="100%">
<tr>
<td>
Kludge Kowboys in Concert, only $50.00 per ticket.<BR>
Please enter number of tickets desired:
<script language="JAVASCRIPT">
<!--
if (navigator.javaEnabled()) {
javaYes()
}
else javaNo()
//-->
</script>
</td>
</tr>
</table>
]]>
Previous Example-|-Next Example-|-Return to Chapter Listing