Accessing a JSON array via javascript (that includes a JSON object) that was created with Java on Android

Question

I am trying to communicate from Java->JS in Android through the use of JSON. I currently create the JSON like so in Java:

JSONObject latLng = new JSONObject();
latLng.put("lat",20.000);
latLng.put("lon",20.000);

JSONArray jsonArray = new JSONArray();
jsonArray.put(latLng);


JSONObject destination = new JSONObject();
destination.put("destination", jsonArray);

passToJs(destination); //theoretical - method looks slightly different

Then, if I log what has been received in JS(lets call it 'data'), the result is the following:

{  
   "destination":[  
      {  
         "lat":20.000,
         "lon":20.000
      }
   ]
}

I am having some problem accessing the individual lat/lon values. I've tried:

data[0]
data[0].lat
data.lat

How do I read and save lat/lon to new variables? BTW, I think my JSON is not so good - is it better to just create a single JSON Object and pass that alone?

Thanks.

problem was with parsing - see comments on @Comforse answer below — mostamazingname
– mostamazingname, Commented Apr 17, 2018 at 19:41

Comforse · Accepted Answer · 2018-04-17 19:26:25Z

2

You are missing the destination node in your object. You should use data.destination[0].lat

answered Apr 17, 2018 at 19:26

Comforse

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3 Comments

mostamazingname Over a year ago

Unfortunately, I've tried that too in the past, but anyway here it is again with the error: (first line is simply data being logged as a whole) {"destination":[{"lat":20.000,"lon":20.000}]} navigation.js:5 Uncaught TypeError: Cannot read property '0' of undefined

Comforse Over a year ago

Try doing JSON.parse(data) and see if that helps. It may be that the data is seen as plaintext.

mostamazingname Over a year ago

Awesome! That seemed to be the problem!! Thanks alot

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