Author: Real Gagnon
Author's WebSite: http://tactika.com/realhome/realhome.html
You call a Java method by giving its fully qualified name. In the following snippet, the first example calls the method in the Toolkit to retrieve the screen resolution. The second example, calls a method in our Applet.
[Java applet]
import java.awt.*;
import java.applet.*;
public class inJava extends Applet{
public void sayHello() {
Graphics g = getGraphics();
g.drawString("Hello from JAVA!", 10, 10);
}
}
[Javascript and HTML]
<HTML><HEAD></HEAD><BODY>
<SCRIPT>
alert("Screen Dimension\n" +
" width:" +
java.awt.Toolkit.getDefaultToolkit().getScreenSize().width +
" height:" +
java.awt.Toolkit.getDefaultToolkit().getScreenSize().height);
</SCRIPT>
<FORM>
<INPUT type="button" value="call JAVA"
onClick = "document.myApplet.sayHello()">
</FORM>
<APPLET CODE="inJava.class"
NAME="myApplet"
HEIGHT=100 WIDTH=100>
</APPLET>
</BODY></HTML>
NOTE: On IE4, you can't call java.lang.* methods directly. IE javascript can only access the public methods of an applet (a class derived from java.applet.Applet) but don't have a general access to other java classes . So the solution is simple, wrap the java.lang.* call in a public method of a "dummy" Applet.
Posted On: 7-Jul-1999
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