Client-Side Examples:

Basic Example

The following code is a simple example of JavaScript syntax.

<SCRIPT LANGUAGE="JavaScript">
<!--
      document.write("Hello World!");
//-->
<!--webbot bot="HTMLMarkup" startspan --></SCRIPT><!--webbot
bot="HTMLMarkup" endspan -->

The println() method prints the value of the variable foo to the Java console. You can click this button as many times as you want, and it will keep printing as did the alert() method, except you don't have to bother with closing the alert dialog every time.

LiveConnect Example 1

<SCRIPT LANGUAGE="JavaScript">
<!--
var foo = 0;
function myFunc3() {
    foo++;
    java.lang.System.out.println("foo=" + foo);
}
//-->
<!--webbot bot="HTMLMarkup" startspan --></SCRIPT><!--webbot
bot="HTMLMarkup" endspan -->

LiveConnect Example 2

The first line of code in the readPref() function calls the public static enablePrivilege() method of the Java security PrivilegeManager class, which is contained in the netscape.security package. When the enablePrivilege() method is called, the digital signature is verified and, if the signature is valid, the Java Security dialog box opens. If the signature is not valid, the script will not be executed and an alert dialog will display a warning message that an uncaught ForbiddenTargetException Java exception error occurred.

This example shows how you generally request expanded privileges from the new Java security model. In this case I passed the UniversalPreferencesRead parameter, which is the system target that's required for reading user preferences. You must grant the requested privilege for Navigator to continue executing the script.

<SCRIPT LANGUAGE="JavaScript1.2" ID="Ex2">
<!--
function readPref(prefName) {
    netscape.security.PrivilegeManager.enablePrivilege("UniversalPreferencesRead");
    alert(prefName + "=" + navigator.preference(prefName));
}
//-->
<!--webbot
bot="HTMLMarkup" startspan --></SCRIPT><!--webbot bot="HTMLMarkup" endspan -->

LiveConnect Example 3

This example uses the java.net.Inetaddress class to find the IP address of the client and prints the results on the page.

<SCRIPT LANGUAGE="JavaScript1.2" ID="Ex3">
<!--
if ((navigator.appVersion.indexOf("4.") != -1) && (navigator.appName.indexOf("Netscape") != -1)){ 
	ip = "" + java.net.InetAddress.getLocalHost().getHostAddress();
	document.write("Your IP address is " + ip);
}
else {
	document.write("IP Address only shown in Netscape with Java enabled!");
}
//-->
<!--webbot
bot="HTMLMarkup" startspan --></SCRIPT><!--webbot bot="HTMLMarkup" endspan -->