Question

I used var dp:ArrayCollection = new ArrayCollection(container.GetVotesResult); to get the JSON data from GetVotesResult method. I get the values as below.

{"GetVotesResult":
[{"Aid":0,"Arank":0,"Atext":null,"ClientId":16,"Votes":0,"qid":10,"qtext":"Who will win 2011 football world cup?"},
{"Aid":4,"Arank":1,"Atext":"yes","ClientId":null,"Votes":0,"qid":null,"qtext":null},
{"Aid":5,"Arank":2,"Atext":"no","ClientId":null,"Votes":0,"qid":null,"qtext":null},
{"Aid":6,"Arank":3,"Atext":"i don't know","ClientId":null,"Votes":0,"qid":null,"qtext":null}]}

I am able to retrieve the 1st array data after looping the dp arraycollection list.

if(i==0)
{
 trace("Show me:",obj.qtext);
}
O/P: Show me: Who will win 2011 football world cup?

How do I retrieve the 2nd, 3rd, 4th and so on (if it has) array datas individually and dynamically. Say, I want to take ‘Atext’ from all the array. Please help. I use flashbuilder4.5..

Answer 1

From your output above, GetVotesResult is an Array of Objects which you can iterate over using a for / for each loop, eg:

var result : String = "";  // JSON String omitted for brevity

// Decode the JSON String into an AS3 Object graph.
var data : Object = JSON.decode(result);

// reference the GetVotesResult Array from the result Object.
var votes : Array = data["GetVotesResult"];

// Iterate over each 'Vote' object in turn and pull out the 
// 'Atext' values the objects contain into a new Array.
var Atexts : Array = [];
for each (var vote : Object in votes) 
{
    // Check for the existance of the 'aText' property.
    if (vote.hasOwnProperty("Atext")) {
        Atexts.push(vote.Atext);
    }
}

// Dump out all the aText values: (,yes, no, i)
trace("Atexts: " + Atexts.join(", "));

Alternatively you may wish to copy the objects into a Map Data Structure (a Dictionary in AS3) to create a lookup table based on one of the Keys:

// Create a new, empty Lookup Table.
var votesByAid : Dictionary = new Dictionary();

// Iterate through the Vote Objects and add each one to the 
// lookup table based on it's Aid property.
for each (var vote : Object in votes) 
{
    // Check for the existance of the 'aId' property to stop
    // any 'nulls' getting into our Lookup Table.
    if (!vote.hasOwnProperty("Aid")) {
        trace("Vote Object did not contain an `Aid` property.");
        continue;
    }

    // Add the entry to the lookup table.
    var key : String = vote.Aid;
    votesByAid[key] = vote;
}

// You can now use the lookup table to fetch the Vote Objects.
trace(votesByAid[6].Atext); // traces 'i don't know'