Reading a 'Collection' object from JSON

[Abhishek Asthana]

Hi

My class has following attributes:
String a;
int b;
ArrayList<String []> c;

I am converting it to JSON object.
jsonObj.put("a", this.a);
jsonObj.put("b", this.b);
jsonObj.put("c", this.c);

I am using Dojo and in my JSP I get the response back in JSON. For ordinary data types 'a' and 'b', it's fine.

function getPaneInfo(id) {
 var params = new Array();
 params['paneId'] = id;
 var bindArgs = {
  url: "url",
  error: function(type, data, evt){ },
  mimetype: "text/json",
  content: params
 };
 var req = dojo.io.bind(bindArgs);
 dojo.event.connect(req, "load", this, "showData");
}
 
function showData(type, data, evt) {
 var target= document.getElementById("target");
 if (!data) {
  target.innerHTML = "Damn Yaar!";
 } else {
  target.innerHTML = "a: " + data.a + "<br/>b: " + data.b;  
 }
}

But how to get the data that is enclosed in 'c'? How to traverse that collection and get the String[] values?

Please help me with this.

Thanks
Abhishek

[Frank Zammetti]

With the caveat that I haven't tried this code, it should just be:

data.c[0]

..or...

for (var i = 0; i < data.c.length; i++) {
doSomething(data.c[i]);
}

So long as your JSP rendered the JSON properly, the c should be an array, which you should be able to just access with simple array notation.

[Abhishek Asthana]

Thanks Frank

That worked partially. My JSONString looks like this:

{"a":"A Value","b":1,"c":["[Ljava.lang.String;@128d1f4"]}

So when I do

for (var i = 0; i < data.c.length; i++) {
html=html+c.forms[i]+"<br/>";
}

It prints '[Ljava.lang.String;@128d1f4' rather than the value contained by this object. How do I get the value printed?

Thanks

[Frank Zammetti]

That *is* the value You have to implement some sort of meaningful toString() on the Java class you're marshalling, otherwise you get the typical, basic Java implementation.