Basic JSON.parse question

Question

I can't seem to access my objects.

after parsing the server string:

var json = JSON.parse(myJsonText):

I get the below with an alert:

alert(json.param1)

{"ID":17,"Name":"swimming pools","ParentID":4,"Path":""},
{"ID":64,"Name":"driveways","ParentID":4,"Path":""}

Now, I am trying to access ID and Name.

I have tried:

json.param1[0].ID
json.param1[0]["ID"]
json.param1[0][0]

And a lot of others that really don't make much sense such as:

json[0].ID or 
json.param1.ID etc...

I am getting (for example, in the case of json.param1[0].ID):

param1.0.ID is null or not an object.

Any ideas?

Answer 1

That looks like invalid JSON. Try wrapping it in the brackets which makes it a valid array of JSON objects. Then access it by index.

[
    {"ID":17,"Name":"swimming pools","ParentID":4,"Path":""},
    {"ID":64,"Name":"driveways","ParentID":4,"Path":""}    
]

Answer 2

If you are receiving the raw JSON in the alert, then that would lead me to believe there is a problem w/ the JSON you are trying to parse.

Answer 3

if json.param1 is what you said it is, then json.param1[0].ID should work (and evaluate to "17").

If it's not working, could you show us the text you're parsing to generate the JSON object?

Answer 4

To compile and expand on all of the comments... ;)

---

Your first clue that something's wrong is your alert:

alert(json.param1)

Instead of getting:

{"ID":17,"Name":"swimming pools","ParentID":4,"Path":""},
{"ID":64,"Name":"driveways","ParentID":4,"Path":""}

You should be getting something similar to the following:

[object],[object]

---

Try alerting the typeof array element, itself:

alert(typeof json.param1[0]) //=> should say "object"

If you get anything besides "object", either the JSON isn't formatted correctly or the parser is failing.

---

One good clue as to which is wrong is if the original JSON looks like this:

{"param1" : [
  "{\"ID\":17,\"Name\":\"swimming pools\",\"ParentID\":4,\"Path\":\"\"}",
  "{\"ID\":64,\"Name\":\"driveways\",\"ParentID\":4,\"Path\":\"\"}"
]}

Then, it's probably the JSON that's broken. (Sorry ;)

On the other hand, if your JSON looks like this:

{"param1" : [
  {"ID":17,"Name":"swimming pools","ParentID":4,"Path":""},
  {"ID":64,"Name":"driveways","ParentID":4,"Path":""}
]}

Then, it's probably the parser.

Answer 5

Try this

// you already have this bit
var json = JSON.parse(myJsonText);
alert(json.param1);

// add this
var tmp_param1 = JSON.parse(json.param1);
json.param1 = tmp_param1;
alert(json.param1);  // should print [object, object] or similar

alert(json.param1[0].ID);  // should print "17"
alert(json.param1[0].Name);  // should print "swimming pools"