CODEWITHSUNDEEP
javascriptasp.netvb.netjsonweb-services
Moe9977
Moe9977

Reputation: 259

Loop through json return undefined

I have a webservice that returns a JSON object, but when I try to loop through it, each item in each object returns undefined

Here is the JSON object returned from the webservice

[{"result":14,"question":"6 - 7  مرات اسبوعيا","aID":70},{"result":29,"question":"3 - 5 مرات اسبوعيا","aID":71},{"result":41,"question":"مرة واحدة اسبوعيا","aID":72},{"result":14,"question":"1 - 3 مرات شهريا","aID":73}]

and here how I loop through it:

var resultAsJson = data.d;
$.each(resultAsJson, function (index, resObject) {
    $('#pollResults').append('<p><strong>' + resObject.result + ' ' +
                resObject.question + '</strong></p>');
    alert(resObject.question);

});

------------------ UPDATE ------------------

hi Guys, the above code worked fine, the problem was the JSON response that I returned from the webservice was serialized as the following:

                Dim m_result As New Data.Objects.ObjectParameter("Result", GetType(Boolean))
            Dim lstofresult As List(Of addPollvote_Result) = Context.addPollvote(para_pid, para_aid, Date.Now, m_UID, Nothing, HttpContext.Current.Request.ServerVariables("REMOTE_ADDR"), Nothing, m_result).ToList
            Dim m_json As New Script.Serialization.JavaScriptSerializer
            Return m_json.Serialize(lstofresult)

When I removed the serialization and just returned the list, it worked perfect, see the below working code.

                Dim m_result As New Data.Objects.ObjectParameter("Result", GetType(Boolean))
            Dim lstofresult As List(Of addPollvote_Result) = Context.addPollvote(para_pid, para_aid, Date.Now, m_UID, Nothing, HttpContext.Current.Request.ServerVariables("REMOTE_ADDR"), Nothing, m_result).ToList
            Return lstofresult

and it worked perfect.

Upvotes: 2

Views: 1363

Answers (3)

Jerad
Jerad

Reputation: 603

The problem seems to be your datasource.

I would use a 'for' loop for testing purposes:

var resultAsJson = data.d;
var resultAsJsonLength = resultAsJson.length;

for(i=0;i<resultAsJsonLength;i++) {
    $('#pollResults').append('<p><strong>' + resultAsJson[i].result + ' ' +
    resultAsJson[i].question + '</strong></p>');

    alert(resultAsJson[i].question);
 }

You're going to have to provide more information about how you're accessing the data, which seems to be the foundation of your problem...

Upvotes: 0

Krease
Krease

Reputation: 16215

Make sure resultAsJson is actually a JSON object and not a string and it should work (see this jsfiddle) - use resultAsJson = JSON.parse(resultAsJson) to do the conversion from string to json object .

Upvotes: 2

Jay
Jay

Reputation: 19867

Give this a go. I assume you're using jQuery:

// The JSON String from the web service
var jsonString = '[{"result":14,"question":"6 - 7  مرات اسبوعيا","aID":70},{"result":29,"question":"3 - 5 مرات اسبوعيا","aID":71},{"result":41,"question":"مرة واحدة اسبوعيا","aID":72},{"result":14,"question":"1 - 3 مرات شهريا","aID":73}]';

// Parse the JSON string into a JS object
var jsonObj = JSON.parse(jsonString);

// Loop through, and pull what you need from it
$(jsonObj).each(function() {
    console.log(this.result + " " + this.question); 
});

Upvotes: 0

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