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Displaying Documents in the Browser (The Java™ Tutorials > Deployment > Applets)
Trail: Deployment
Lesson: Applets
Section: Taking Advantage of the Applet API
Home Page > Deployment > Applets
Displaying Documents in the Browser

Have you ever wanted an applet to display formatted HTML text? There's an easy way to do it: Ask the browser to display the text for you.

With the AppletContext showDocument methods, an applet can tell the browser which URL to show and in which browser window.

Here are the two forms of showDocument:

public void showDocument(java.net.URL url)
public void showDocument(java.net.URL url, String targetWindow)

The one-argument form of showDocument simply tells the browser to display the document at the specified URL, without specifying the window to display the document in.


Terminology Note:  In this discussion, frame refers not to a Swing JFrame, but to an HTML frame within a browser window.

The two-argument form of showDocument lets you specify which window or HTML frame to display the document in. The second argument can have the values listed below.

"_blank"
Display the document in a new, nameless window.
"windowName"
Display the document in a window named windowName. This window is created if necessary.
"_self"
Display the document in the window and frame that contain the applet.
"_parent"
Display the document in parent frame of the applet's frame. If the applet frame has no parent frame, this acts the same as "_self".
"_top"
Display the document in the top-level frame. If the applet's frame is the top-level frame, this acts the same as "_self".

The following applet lets you try every option of both forms of showDocument. The applet brings up a window that lets you type in a URL and choose any of the showDocument options. When you press Return or click the Show document button, the applet calls showDocument.


Note: If you don't see the applet running above, you need to install Java Plug-in, which happens automatically when you install the Java(TM) SE JRE or JDK. This applet requires JDK 1.4 or later. You can find more information on the Java Plug-in home page.

Following is the applet code that calls showDocument. (Here's the whole program.)

        ...//In an Applet subclass:
        urlWindow = new URLWindow(getAppletContext());
        . . .

class URLWindow extends Frame {
    . . .
    public URLWindow(AppletContext appletContext) {
        . . .
        this.appletContext = appletContext;
        . . .
    }
    . . .
    public boolean action(Event event, Object o) {
        . . .
            String urlString = /* user-entered string */;
            URL url = null;
            try {
                url = new URL(urlString);
            } catch (MalformedURLException e) {
                ...//Inform the user and return...
            }

            if (url != null) {
                if (/* user doesn't want to specify the window */) {
                    appletContext.showDocument(url);
                } else {
                    appletContext.showDocument(url,
                                               /* user-specified window */);
                }
            }
        . . .
Previous page: Displaying Short Status Strings
Next page: Sending Messages to Other Applets
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