How to get values from a Java HashMap in javascript function using Rhino

Question

I am using Rhino library to execute JavaScript functions in android. I have a javascript function like,

var exucuteJS = function(controlValues) {
var valueSelected = controlValues['country'];
valueSelected = valueSelected.toUpperCase();
 switch (valueSelected) {
    case "INDIA":
        return "IND_HOME";
    case "NEPAL":
        return "NEP_HOME";
    default:
        return "DEF_HOME"
 }
}

I am passing a Java HashMap object as parameter, say controlValues to the function executeJS. The problem is , the Rhino cant javascript code, to get the value from the key.

var valueSelected = controlValues['country'];

the return value is undefined.

it works fine with this line,

var valueSelected = controlValues.get('country');

but its not valid javascript code.

The same javascript is to be executed both in android and iOS. the above line will not supported in iOS. Please suggest. I am using latest version of Rhino.

i didnt undestand why downvoted. Requirement will be different for different persons. Down voting without understanding the same is very disgusting — Arundas K V
– Arundas K V, Commented Apr 7, 2016 at 9:08

Arundas K V · Accepted Answer · 2016-04-26 06:29:33Z

2

Finally Myself found the answer.

Rather than sending a HashMap to the javascript function, need to send it as a JSONObject. Not like a normal JSONObject's object but as a Object which is in the form of NativeJSON object.

Object nativeJsonObject= NativeJSON.parse(rhino,scope,controlValueJsonString,new NullCallable());

where, rhino - Rhino's Context object. scope - Scriptable's object controlValueJsonString - JSON string equivalent to the HashMap. (controlValueJsonString = new Gson().toJson(hashMap);)

NullCallable is a class implemented from Callable,(package from rhino's org.mozilla.javascript.Callable)

this 'nativeJsonObject' should be passed to javascript function.

Object[] params = new Object[] { controlValues };

from a JSON object, javascript can get the values as,

var valueSelected = controlValues['country'];

this is working for me. Really i dont know why down voted to this question. Admins, please note this issue.

answered Apr 26, 2016 at 6:29

Arundas K V

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1 Comment

agermano Over a year ago

This is not actually answering the question you asked. This answers how to convert a HashMap to a NativeObject in Java using Rhino. You already answered the question in your question. The way to access a HashMap in a javascript function using Rhino is controlValues.get('country');

F43nd1r · Accepted Answer · 2016-04-07 07:38:09Z

0

The only way to access data of a complex oject is using its interface. You need to create separate solutions for Android and ios.

The typeof operator should help you to switch between these cases.

answered Apr 7, 2016 at 7:38

F43nd1r

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3 Comments

Arundas K V Over a year ago

My requirement is to run the above mentioned javascript in Android. get() method is purely java. Why its not executing hashmap['key'] method to get value from hashmap

F43nd1r Over a year ago

because a map is not a js object. The values are not saved in Fields.

Arundas K V Over a year ago

is there any way to achieve this. I have a java HashMap, needs to be sent to javascript funcion.

Niklas Eldberger · Accepted Answer · 2017-07-05 13:58:16Z

0

Simpler solution where you do not have to implement a NullCallable class is

new JsonParser(context, scope).parseValue("{\"this is\":\"JSON\"}");

which I found at Rhino: return JSON from within Java

answered Jul 5, 2017 at 13:58

Niklas Eldberger

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