JSObject, how can I call JS function from Java Applet ?

Greenhorn

Posts: 2

posted 16 years ago

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Hi,
The code below working, but the calling JS not....and nothing happens , no error.
I did it with help from this side :
http://java.sun.com/j2se/1.5.0/docs/guide/plugin/developer_guide/java_js.html
Anybody know what is wrong?
Thanks!

HTML :

Java Applet

public void sendMsgUsingCall(final String method, final Object[] args) {
		//Parameter method is method in JavaScript, args are Parameters passing to the Method 
		System.out.println("HelloWorld.sendMsgUsingCall()");
		try {
			final JSObject win = JSObject.getWindow(this);
			win.call(method, args);
		} catch (final JSException ex) {
			aMessage.setText(ex.getMessage());
		}
	}

public void multipliStr(final String zahl1, final String zahl2) {
		boolean success = true;
		String mult = zahl1 + "  " + zahl2;
		aMessage.setText("DIe beide Zahlen sind :" + mult);
		final String sd1 = zahl1.toString();
		final String sd2 = zahl2.toString();
		try {
			d1 = Integer.parseInt(sd1);
			d2 = Integer.parseInt(sd2);

} catch (final NumberFormatException nfe) {
			System.out.println("NumberFormatException: " + nfe.getMessage());
			//aMessage.setText("NumberFormatException");
			success = false;
		}
		final int d3 = d1 * d2;
		mult += " = " + String.valueOf(d3);
		aMessage.setText("DIe beide Zahlen sind :" + mult);
		//call java Script side with JSObject
		final Object[] args = { mult };
		sendMsgUsingCall("getMsgFromJava()", args);
	}

Ulf Dittmer

Rancher

Posts: 43081

posted 16 years ago

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Welcome to JavaRanch.

These are exclusively English-language forums; please supply an English translation of your question, or it is liable to be deleted.

What happens if you run this code? Are there any error messages, either from JavaScript or from Java?

AndXlr andrzej

Greenhorn

Posts: 2

posted 16 years ago

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Ulf Dittmer wrote:Welcome to JavaRanch.

These are exclusively English-language forums; please supply an English translation of your question, or it is liable to be deleted.

What happens if you run this code? Are there any error messages, either from JavaScript or from Java?

Hi Ulf ,
I am sorry, I mixed up languages

I don't get any Error, on my TextFeld I see massege from :

DIe beide Zahlen sind :12 12
So this code part is not working :
"
and after this nothing happens...

thank you!

Ulf Dittmer

Rancher

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posted 16 years ago

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Not sure what's going on, but LiveConnect (the Java/JavaScript bridge technology) is notoriously fickle. I'd recommend to use the Common DOM API instead, if at all possible.

Rok Štelcer

Ranch Hand

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posted 16 years ago

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Hi,

On the first look I'd say that there could be two potential problems in your example/code:

1. I'm not sure, if you're calling the JSObject.getWindow in a right place
As far as I know, you should call it in Applets init() method.
Example:

2. Following code is missing in your HTML:

Hope this helps.

Regards,
Rok

SCJP, SCWCD

Don't get me started about those stupid light bulbs.