How to create a JSONArray that contains Javascript code inside Java?

Question

I am creating a JSONArray and parse it to a String, but as it even contains Strings instead of code it doesn't output as I need it.

for(Place place: places){
    locations.put("new google.maps.LatLng("+place.getContactData().getLatitude()+","+place.getContactData().getLongitude()+")");
}
return locations.toString();

It outputs as: ["new google.maps.LatLng(53.5608,9.96357)","new google.maps.LatLng(53.5608,9.96357)"] but I need it without quotation marks like [new google.maps.LatLng(53.5608,9.96357),new google.maps.LatLng(53.5608,9.96357)] to be correctly interpreted by javascript.

And [new google.maps.LatLng(53.5608,9.96357),new google.maps.LatLng(53.5608,9.96357)] is going to be a string inside JSON itself or not? Because if not, then it's invalid JSON. — Felix Kling
– Felix Kling, Commented Feb 25, 2013 at 11:40
There is no code in a JSON data structure, thats simply not supported by the format. — Henry
– Henry, Commented Feb 25, 2013 at 11:41

x4rf41 · Accepted Answer · 2013-02-25 12:01:49Z

2

Another method would be:

create an array with just the coordinates:

for(Place place: places){
    JSONObject obj = new JSONObject();
    obj.put("lat",place.getContactData().getLatitude());
    obj.put("lng",place.getContactData().getLongitude());
    locations.put(obj);
}

and then in javascript:

var places = (yourPlacesJson);
var placeObjects = [];

for(var i=0;i<places.length;i++)
{
    placeObjects[placeObjects.length] = new google.maps.LatLng(places[i].lat,places[i].lng);
}

answered Feb 25, 2013 at 12:01

x4rf41

5,3672 gold badges24 silver badges36 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Lester Over a year ago

Sounds really smart. In the source code the array shows up as var places = [{"lng":9.963569641113281,"lat":53.56079864501953},{"lng":9.979949951171875,"lat":53.55149841308594}]; but when I alert(places) it is empty. What might I have missed?

Felix Kling Over a year ago

@Lester: There is not enough information to answer this question. Maybe you call alert(places) where places is not visible. Note that if you get the output [object Object],[object Object], that's perfectly normal.

Lester Over a year ago

Now it works perfectly. Maybe just some browser cache issue. :) Thanks a lot for all replies!

Philipp · Accepted Answer · 2013-02-25 11:58:49Z

1

JSON only supports plain-old-data. It can't include any executable code (a new is executable code). This is by design - when JSON would be able to include executable code you would have to be much more carefully with importing JSON from an untrusted source.

All you can do is pass javascript code as strings and eval() it on the JS side after parsing the JSON.

answered Feb 25, 2013 at 11:58

Philipp

70.1k10 gold badges121 silver badges159 bronze badges

Comments

Werdli · Accepted Answer · 2013-02-25 11:51:01Z

0

Also you could use Regular expressions to remove the ", if you parse the json to another language

answered Feb 25, 2013 at 11:51

Werdli

3351 gold badge4 silver badges11 bronze badges

Comments

x4rf41 · Accepted Answer · 2013-02-25 11:43:15Z

-1

i had a similar problem, the way i made this work:

instead of writing the javascript before the json conversion, insert a placeholder.

locations.put("%mapsPlaceholder1%");

then after filling the array with placeholders, do:

locations.toString().replaceFirst("\"%mapsPlaceholder1%\"","yourJsCode");

something like that

you could also just create the array string manually

answered Feb 25, 2013 at 11:43

x4rf41

5,3672 gold badges24 silver badges36 bronze badges

4 Comments

Lester Over a year ago

Yeah, that's a nice approach. I just can't think of a way to do this for the whole List places.

x4rf41 Over a year ago

i think an actually better way for your problem would be: just add the coordinates to the array, and then create the google.maps.LatLng object in javascript by iterating through the array

Lester Over a year ago

sounds like a fine plan b. Thank you!

x4rf41 Over a year ago

look my 2nd answer, thats how i would do it

Collectives™ on Stack Overflow

How to create a JSONArray that contains Javascript code inside Java?

4 Answers 4

3 Comments

Comments

Comments

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

3 Comments

Comments

Comments

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related