Ways to retrieve various JSON arrays in Javascript

I have a Java servlet that constructs JSON objects and arrays and sends them as a response. After sending the initial JSON data, I then loop through a list to create more JSON objects.

JSONObject jsonObject = new JSONObject();
JSONArray jsonArray = new JSONArray();
jsonObject.put("Status", status);
jsonObject.put("isActive", isActive);

jsonArray.add(jsonObject);
response.getWriter().write(jsonArray.toString());

// Additional for loops are executed here.

JSONArray jsonArray2 = new JSONArray();
for(int i=0;i<list.size();i++){
DTO dtost = list.get(i);
JSONObject jsonObj = new JSONObject();
jsonObj.put("Label",dtost.getLabel());
jsonObj.put("UNID",dtost.getUNID());

jsonArray2.add(jsonObj); 
}

response.getWriter().write(jsonArray2.toString());

However, I am facing challenges in formatting this JSON correctly and accessing its values using JavaScript.

[{"Status":"Passed","isActive":"No"}] [{"Label":"MembershipCard","UNID":"01"},{"Label":"LoyaltyCard","UNID":"02"}]

In my attempt to retrieve the JSON values with JavaScript, I am not successful:

success: function(data) {

  alert(data[0].Status); // This returns nothing
}

If you have any insights on how to properly format and access this JSON data in JavaScript, I would greatly appreciate it.

javascriptarraysjsonservlets

Answer №1

The JSON mentioned above is considered invalid. However, if we make a modification to the JSON like this "[[{"State":"Passed","isAvailable":"No"}], [{"Category":"MembershipCard","ID":"01"},{"Category":"LoyaltyCard","ID":"02"}]]" then it would become a valid JSON.

To retrieve the State parameter from the data provided above, you can do something similar to this:

success: function(data){<br>
    alert(data[0][0].State);<br>
}

Answer №2

To optimize your Java code for generating a valid JSON object, follow these steps:

JSONObject output= new JSONObject();
JSONObject jsonObject = new JSONObject();
JSONArray jsonArray = new JSONArray();

// Add data to the first array
jsonObject.put("Status", status);
jsonObject.put("isActive", isActive);
jsonArray.add(jsonObject);
output.put("first", jsonArray);

// Use for loops to populate the second array
JSONArray jsonArray2 = new JSONArray();
for(int i=0; i<list.size(); i++){
    DTO dtost = list.get(i);
    JSONObject jsonObj = new JSONObject();
    jsonObj.put("Label", dtost.getLabel());
    jsonObj.put("UNID", dtost.getUNID());

    jsonArray2.add(jsonObj); 
}
output.put("second", jsonArray2);

response.getWriter().write(output.toString());

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