Re: Applets security and HTMLets

From:

=?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>

Newsgroups:

comp.lang.java.programmer

Date:

Sat, 02 Feb 2013 13:48:22 -0500

Message-ID:

<510d5f7d$0$289$14726298@news.sunsite.dk>

On 2/2/2013 12:49 PM, Stefan Ram wrote:

Arne Vajh?j <arne@vajhoej.dk> writes:

Java applets already have access to the HTML DOM.

   If you refer to Live Connect: This needs JavaScript AFAIK.
   Or what else did you think of?

   Moreover, what would be nice, would be also Java Listeners
   for web page events, like

<form name="input" action="MyJavaClass.class" method="java">
Username: <input type="text" name="user">
<input type="submit" value="Submit">

   , where ?MyJavaClass? is a class that implements the
   interface ?HTMLFormListener? (to be defined) and gets the
   form data (here, "user") via the HTMLFormEvent (to be defined).

<applet code="htmldemo.OldStyle.class" codebase="." archive="oldstyle.jar"
         name="myapplet" width="1" height="1" mayscript>
</applet>
<form name="myform">
<input type="text" name="myfield1">
<br>
<input type="text" name="myfield2">
<br>
<input type="text" name="myfield3">
<br>
<input type="submit" value="Add" onclick="document.myapplet.calc();
return false">
</form>

package htmldemo;

import javax.swing.JApplet;

import netscape.javascript.JSObject;

public class OldStyle extends JApplet {
    public void calc() {
         JSObject window = JSObject.getWindow(this);
         JSObject doc = (JSObject)window.getMember("document");
         JSObject myform = (JSObject)doc.getMember("myform");
         JSObject myfield1 = (JSObject)myform.getMember("myfield1");
         JSObject myfield2 = (JSObject)myform.getMember("myfield2");
         JSObject myfield3 = (JSObject)myform.getMember("myfield3");
         int val1 =
Integer.parseInt(myfield1.getMember("value").toString());
         int val2 =
Integer.parseInt(myfield2.getMember("value").toString());
         int val3 = val1 + val2;
         myfield3.setMember("value", Integer.toString(val3));
    }
}

or:

<applet code="htmldemo.NewStyle.class" codebase="." archive="newstyle.jar"
         name="myapplet" width="1" height="1" mayscript>
</applet>
<form>
<input type="text" id="myfield1">
<br>
<input type="text" id="myfield2">
<br>
<input type="text" id="myfield3">
<br>
<input type="submit" value="Add" onclick="document.myapplet.calc();
return false">
</form>

package htmldemo;

import javax.swing.JApplet;

import org.w3c.dom.Element;
import org.w3c.dom.html.HTMLDocument;
import org.w3c.dom.html.HTMLInputElement;

import com.sun.java.browser.dom.DOMAccessException;
import com.sun.java.browser.dom.DOMAccessor;
import com.sun.java.browser.dom.DOMAction;
import com.sun.java.browser.dom.DOMService;
import com.sun.java.browser.dom.DOMUnsupportedException;

public class NewStyle extends JApplet {
    public void calc() {
        try {
            DOMService service = DOMService.getService(this);
            service.invokeAndWait(new DOMAction() {
                public Object run(DOMAccessor accessor) {
                     HTMLDocument doc = (HTMLDocument)
accessor.getDocument(NewStyle.this);
                     HTMLInputElement myfield1 =
(HTMLInputElement)doc.getElementById("myfield1");
                     HTMLInputElement myfield2 =
(HTMLInputElement)doc.getElementById("myfield2");
                     HTMLInputElement myfield3 =
(HTMLInputElement)doc.getElementById("myfield3");
                     int val1 = Integer.parseInt(myfield1.getValue());
                     int val2 = Integer.parseInt(myfield2.getValue());
                     int val3 = val1 + val2;
                     myfield3.setValue(Integer.toString(val3));
                     return null;
                }
            });
        } catch (DOMUnsupportedException e) {
            e.printStackTrace();
        } catch (DOMAccessException e) {
            e.printStackTrace();
        }
    }
}

At least the first stuff is intended to be used with JavaScript,
but there are not really any JavaScript involved.

Arne