Wrapplet demo
Demos of the Wrapplet used in a variety of forms.
Load and configure main applet
The Wrapplet loading a second TestApplet if the
JRE version is 1.2 or better.
Type some text in the form and submit it to see that text appear
in the (red bordered) applet JTextArea. This behavior is provided by
the Wrapplet having the allow.query.param
parameter added. This then enables functionality to override the
'text' parameter of the applet as specified in HTML, with the equivalent query parameter.
If no query parameter is present, the parameter specified in the applet element will
be used.
The second instance of the applet (with green border) specifies no
allow.query.param parameter, and the default
text should remain constant no matter what the URL query is.
Deployers should consider carefully before allowing the applet's HTML parameters to be changed in the URL. The two main concerns are security, and separation of parameters for multiple applets.
Fall-back to..
These calls specify a targetVersion of 3.6, so they should be assured of
demonstrating the fall-back strategies for a good while yet.
..An error label
When the minimum version cannot be met, and no
fallbackApplet is named, the
Wrapplet will display a simple message.
Note that the message might become too long for an applet with a small width.
The width specified for this applet is 400px.
A java.awt.Label is used for a version 1.1 JRE, while a
javax.swing.JLabel is used for 1.2+ JREs.
..Another applet
This call adds the minimal form of
JumpButton.
To succeed, the jumbputton.jar (or whatever archive
contains the alternate applet) must be added to the archive
attribute of the applet element
(which then makes the Wrapplet, guest applet and the
JumpButton all on the runtime classpath).
As an alternative to adding JumpButton, a deployer might use
VersionCheck, which upon finding inadequate Java, would redirect
automatically to the help/download page. The advantage of using the simpler
JumpButton is that while VersionCheck
'breaks the back button', the JumpButton does not, since it
places the redirect at the user's discretion (and specific action).
Float applet
This applet is floatable..
