How to pass a Java array to javascript

Question

I have a JavaFX application that shows the location point on Google maps. It is working fine when I pass only variables in javascript. Hhere is the code in JavaFX where I am passing the variables name (lat and lon)

  public void handle(ActionEvent arg0) {
                lat = Double.parseDouble(latitude.getText());
                lon = Double.parseDouble(longitude.getText());

                System.out.printf("%.2f %.2f%n", lat, lon);

                webEngine.executeScript("" +
                    "window.lat = " + lat + ";" +
                    "window.lon = " + lon + ";" +
                    "document.goToLocation(window.lat, window.lon);"
                );
            }
        });

I want to pass a double array instead of double variable. Here is the javascript function where I am receiving values from Java variable name (x and y)

 document.goToLocations = function(x, y) {
        alert("goToLocation, x: " + x +", y:" + y);
        var latLng = new google.maps.LatLng(x, y);
        marker.setPosition(latLng);
        map.setCenter(latLng);


    }

And here is the code example link that i am using Code Example

A solution that came to my mind (I'm not a java developer) is that you can convert the array to string like "[1,2,3,4]" and pass it as a string inside javascript eval() method and assign it to a variable there. — Ahmed I. Elsayed
– Ahmed I. Elsayed, Commented Apr 18, 2020 at 17:43

Arvind Kumar Avinash · Accepted Answer · 2020-04-18 18:12:40Z

1

You can do something like:

public void handle(ActionEvent arg0) {
    List<Double> list = List.of(Double.parseDouble(latitude.getText()), Double.parseDouble(longitude.getText()));
    //Pass list.toString() to the JavaScript function
    //...
}

document.goToLocations = function(values) {
    var x = values.split(", ");
    alert(x);
    alert(x[0]);
    //...
}

List.of was added in Java9. For Java version lower than 9, use the following statement:

List<Double> list = Arrays.asList(Double.parseDouble(latitude.getText()), Double.parseDouble(longitude.getText()));

-OR-

List<Double> list = new ArrayList<Double>();
list.add(Double.parseDouble(latitude.getText()));
list.add(Double.parseDouble(longitude.getText()));

edited Apr 18, 2020 at 18:12

answered Apr 18, 2020 at 17:49

Arvind Kumar Avinash

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10 Comments

Bila Hassan Over a year ago

The method of(double, double) is undefined for the type List

Arvind Kumar Avinash Over a year ago

List.of was added in Java9. I've updated my answer. Feel free to comment in case of any further issue.

Bila Hassan Over a year ago

thanks for your answer but google maps stop working when i am adding eval function

Arvind Kumar Avinash Over a year ago

I've updated my answer with another way instead of using eval. Feel free to comment in case of any further issue.

Bila Hassan Over a year ago

thank you Arvind Kumar Avinash , i have modify your code and it works now and your answer helped me a lot thank you

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