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POIterate through JSON object list provided by ASP.NET webservice
 

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  1. POIterate through JSON object list provided by ASP.NET webservice
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    <p>I have an ASP.NET webservice method that returns a generics list (List'&lt;'Construct>) serialized as JSON, using code such as this:</p> <pre><code> [WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] [ScriptService] public class TestService : System.Web.Services.WebService { [WebMethod] [ScriptMethod(ResponseFormat = ResponseFormat.Json)] public string GetOccupationListJSON(int SOCLevel) { Construct NewConstructList = new ConstructList(); DataContractJsonSerializer serializer = new DataContractJsonSerializer(ConstructList.GetType()); MemoryStream ms = new MemoryStream(); serializer.WriteObject(ms, NewConstructList); string json = Encoding.Default.GetString(ms.ToArray()); return json; } } </code></pre> <p>I then use jQuery to call this method, and get the JSON data, like so:</p> <pre><code>function GetCustomerList() { $.ajax({ type: "POST", url: "/WebService.asmx/GetConstructList", data: "{}", contentType: "application/json; charset=utf-8", dataType: "json", success: function (data) { LoadConstructData(data.d); }, failure: function() { alert("Sorry, we were unable to find the constructs."); } }); } </code></pre> <p>The JSON result looks like this:<br> <code>[ { "ConstructLabel": "Construct label 1", "ConstructType": 2, }, { "ConstructLabel": "Construct label 2", "ConstructType": 3, } ]</code></p> <p>I then want to iterate through the elements in the ConstructList in the JSON data. This is the function that gets called on when the jQuery Ajax call is successful:</p> <pre><code>function LoadConstructData(data) { for (var i = 0, len = data.length; i &lt; len; ++i) { var Construct = data[i]; var ConstructLabel = Construct.ConstructLabel var ConstructType = Construct.ConstructType; } } </code></pre> <p>I assumed (from looking elsewhere) that accessing the JSON data through the index would provide me with access to the underlying object at that index, so that I can then work with it to access its properties.<br> However, when <code>i=0</code> and I do <code>var Construct = data[i];</code> I get the character at the i position of the data array ([), and in the next iteration I get the second character ({). So clearly I am accessing the elements of a string array rather than the JSON data object.<br> How do I make sure that the data returned by the webservice gets into proper JSON format, so that I can iterate through the object elements within it?</p>
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    1. USProposition Joe
    1. USProposition Joe
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    1. COWhat does your *entire* result look like? The result in your question must be wrapped in something, quotes if nothing else.
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      1. USNick Craver
    2. COShow us the webservice method signature, including any attributes.
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    3. COI suspect you are returning your json serialized data within a webservice method that is itself json serialized, but impossible to tell without seeing the method signature.
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      1. USandynormancx
 

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