FileDocCategorySizeDatePackage
HTMLWriter.javaAPI DocExample5415Mon Sep 22 13:30:32 BST 1997None

HTMLWriter

public class HTMLWriter extends Writer
An output stream that sends HTML text to a newly created web browser window. It relies on the netscape.javascript.JSObject class to send JavaScript commands to the Web browser, and only works for applets running in the Netscape Navigator Web browser.

Fields Summary
JSObject
main_window
JSObject
window
JSObject
document
static int
window_num
Constructors Summary
public HTMLWriter(Applet applet, int width, int height)
When you create a new HTMLWriter, it pops up a new, blank, Web browser window to display the output in. You must specify the applet (this specifies the main browser window) and the desired size for the new window.

   // used to give each new window a unique name
  
                                             
         
    // Verify that we can find the JSObject class we need.  Warn if not.
    try { Class c = Class.forName("netscape.javascript.JSObject"); }
    catch (ClassNotFoundException e) {
      throw new NoClassDefFoundError("HTMLWriter requires " +
                                     "Netscape Navigator 4.0 or higher");
    }

    // Get a reference to the main browser window from the applet.
    main_window = JSObject.getWindow(applet);

    // Create a new window to display output in.
    window = (JSObject)
      main_window.eval("self.open(''," +
                       "'HTMLWriter" + window_num++ + "'," +
                       "'menubar,status,resizable,scrollbars," +
                       "width=" + width + ",height=" + height + "')");

    // Obtain the Document object of this new window, and open it.
    document = (JSObject) window.getMember("document");
    document.call("open", null);
Methods Summary
public voidclose()
When the stream is closed, close the JavaScript Document object (But don't close the window yet.)

 document.call("close", null); document = null;
public voidcloseWindow()
If the browser window is still open, close it. This method is unique to HTMLWriter.

    if (document != null) close();
    if (!((Boolean)window.getMember("closed")).booleanValue())
      window.call("close", null);
    window = null;
public voidfinalize()
A finalizer method to close the window in case we forget.

 closeWindow();
public voidflush()
There is no general way to force JavaScript to flush all pending output, so this method does nothing. To flush, output a

tag or some other HTML tag that forces a line break in the output.

public voidwrite(char[] buf, int offset, int length)
This is the write() method required for all Writer subclasses.
Writer defines all its other write() methods in terms of this one.
    // If no window or document, do nothing.   This occurs if the stream
    // has been closed, or if the code is not running in Navigator.
    if ((window == null) || (document == null)) return;
    // If the window has been closed by the user, do nothing
    if (((Boolean)window.getMember("closed")).booleanValue()) return;
    // Otherwise, create a string from the specified bytes
    String s = new String(buf, offset, length);
    // And pass it to the JS document.write() method to output the HTML
    document.call("write", new String[] { s });