CODEWITHSUNDEEP
javajavascriptapplet
bhalkian
bhalkian

Reputation: 499

Javascript to Java Applet communication

I am trying to pass a selected value from HTML drop-down to an Applet method, using setter method in the Applet. But every time the Javascript is invoked it shows "object doesn't support this property or method" as an exception.

My javascript code :

function showSelected(value){
    alert("the value given from"+value);
    var diseasename=value;
    alert(diseasename);
    document.decisiontreeapplet.setDieasename(diseasename);

    alert("i am after value set ");
}

My applet code :

package com.vaannila.utility;


import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;


import prefuse.util.ui.JPrefuseApplet;

public class dynamicTreeApplet extends JPrefuseApplet {

    private static final long serialVersionUID = 1L;
    public static int i = 1;
    public String dieasenameencode;
    //System.out.println("asjdjkhcd"+dieasenameencode);
    public void init() {
        System.out.println("asjdjkhcd"+dieasenameencode);
        System.out.println("the value of i is " + i);
        URL url = null;
        //String ashu=this.getParameter("dieasenmae");
        //System.out.println("the value of the dieases is "+ashu);

        //Here dieasesname is important to make the page refresh happen 

        //String dencode = dieasenameencode.trim();
        try {
            //String dieasename = URLEncoder.encode(dencode, "UTF-8");
            // i want this piece of the code to be called 
            url = new URL("http://localhost:8080/docRuleToolProtocol/appletRefreshAction.do?dieasename="+dieasenameencode);
            URLConnection con = url.openConnection();
            con.setDoOutput(true);
            con.setDoInput(true);
            con.setUseCaches(false);
            InputStream ois = con.getInputStream();
            this.setContentPane(dynamicView.demo(ois, "name"));
            ois.close();

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (FileNotFoundException f) {
            f.printStackTrace();

        } catch (IOException io) {
            io.printStackTrace();
        }
        ++i;
    }

    public void setDieasename(String message){
        System.out.println("atleast i am here and call is made ");
        this.dieasenameencode=message;
        System.out.println("the final value of the dieasenmae"+dieasenameencode);

    }

}

My appletdeployment code :

<applet id="decisiontreeapplet" code="com.vaannila.utility.dynamicTreeApplet.class" archive="./appletjars/dynamictree.jar, ./appletjars/prefuse.jar" width ="1000" height="500" >    
</applet>

Upvotes: 4

Views: 11862

Answers (4)

Rostislav Matl
Rostislav Matl

Reputation: 4543

I think the <applet> tag is obsolete and <object> tag shoudl be used instead. I recall there was some boolean param named scriptable in the object tag.

Why you do not use deployment toolkit ? It would save you a lot of trying - see http://rostislav-matl.blogspot.com/2011/10/java-applets-building-with-maven.html for more info.

Upvotes: -1

Andrew Thompson
Andrew Thompson

Reputation: 168815

Change.. 

document.decisiontreeapplet

..to.. 

document.getElementById('decisiontreeapplet')

..and it will most likely work.

E.G.

HTML

<html>
<body>
<script type='text/javascript'>
function callApplet() {
    msg = document.getElementById('input').value;
    applet = document.getElementById('output');
    applet.setMessage(msg);
}
</script>
<input id='input' type='text' size=20 onchange='callApplet()'>
<br>
<applet
    id='output'
    code='CallApplet'
    width=120
    height=20>
</applet>
</body>
</html>

Java

import javax.swing.*;

public class CallApplet extends JApplet {

    JTextField output;

    public void init() {
        output = new JTextField(20);
        add(output);
        validate();
    }

    public void setMessage(String message) {
        output.setText(message);
    }
}

Please also consider posting a short complete example next time. Note that the number of lines in the two sources shown above, is shorter that your e.g. applet, and it took me longer to prepare the source so I could check my answer.

Upvotes: 7

Perception
Perception

Reputation: 80593

Try changing the id parameter in your applet tag to name instead.

<applet name="decisiontreeapplet" ...>
</applet>

Upvotes: 1

Daniel Pereira
Daniel Pereira

Reputation: 1785

Try passing parameters using the param tag:

http://download.oracle.com/javase/tutorial/deployment/applet/param.html

Upvotes: -1

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