Updating a Json array by including a new property using the Gson library

Using Gson, I am serializing a list of objects in the following manner:

String responseMessage = new Gson().toJson(pages.get(pagenumber));

Now, I want to include an additional property that can be accessed in JavaScript, which is not related to the list:

{"numberofpages":x}

My attempted solution was:

    JsonElement responsemessage = new Gson().toJsonTree(pages.get(pagenumber));
   JsonObject message = (JsonObject) responsemessage;
   message.addProperty("numberofpages",numberofpages);

However, I encountered an issue because responsemessage was recognized as a JSONArray. How can I encode more data within the String version of responseMessage to be utilized in JavaScript?:

$.get("/lod1/Data",{pagenumber: page},function(list){
      console.log(list);
      //???
      //if(list.numberofpages == 5){

       // }

        $.each(list,function(index,card){
           $("#questionsforsets").append('<tr><td class="questioncell"><div class="longtexttd">'+card.card+'</div></td><td>'+card.category+'</td><td>'+card.made+'</td><td>'+card.missed+'</td></tr>'); 
        });
  },"json");

Answer №1

It's important to note that you cannot directly add a property to a JSON Array.

If your responsemessage is in array form and you require passing an additional value, the recommended approach is to encapsulate this array and the value in a new object. Consider the following implementation:

JsonObject responseObject = new JsonObject();
responseObject.addProperty("pages", responsemessage);
responseObject.addProperty("numOfPages", numberOfPages);

(Be sure to make the necessary adjustments in your JavaScript code to handle this response accordingly)

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