How to pass a string array as a JSON argument

Question

I'm trying to pass a couple of arguments to my JSON callback, however the string[] argument remains null. How do I need to pass the string array from javascript to get this working?

Javscript function:

function jsonCallback(jsonCallbackID, argumentsArray) {
var argumentValues = [];
for (var i = 0; i < argumentsArray.length; i++) {
    argumentValues.push('' + $("#" + argumentsArray[i]).val());
}

// build request
var url = encodeURI("/DataEntry/JsonCallback/");
var data = ({ jsonCallbackID: jsonCallbackID, jsonCallbackValues: argumentValues, rndvalue: Math.floor(Math.random() * 10000000001) });

// fire request
$.getJSON(url, data, function (data) {});

The actual callback C# function:

        public JsonResult JsonCallback(int jsonCallbackID, string[] jsonCallbackValues)
    { }

This function does get called however, argument 'jsonCallbackValues' is null.

EDIT

To get this working I did the following:

var data = ({ jsonCallbackID: jsonCallbackID, jsonCallbackValues: argumentValues.toString(), rndvalue: Math.floor(Math.random() * 10000000001) });

And split the jsonCallbackValues string at "," to get the resulting array.

What's the value of "argumentValues" before it gets sent to the service? — Chris Dixon
– Chris Dixon, Commented Sep 21, 2012 at 8:21
The value of argumentValues is:rgumentValues: Array[3] 0: "1111aa" 1: "BE" 2: "24041" length: 3 — Arthur
– Arthur, Commented Sep 21, 2012 at 8:23
is the jsonCallbackID sending through all fine? The serialization of the jsonCallbackvalues should be all fine from what I can see. — Chris Dixon
– Chris Dixon, Commented Sep 21, 2012 at 8:29
By using getJSON you are basically executing an ajax call with content type of json. That will trigger the model-binder on the server side to assume all the values you are sending up are in JSON serializable format. If they are not than the JSON model-binder on the server-side is unable to populate your parameters correctly, hence null. If you are telling it you are passing JSON than you need to pass JSON serializable parameters. — Nope
– Nope, Commented Sep 21, 2012 at 8:37
@Arthur: getJSON is the same as $.ajax({ url: url, dataType: 'json', data: data, success: callback }); If you want more control you can use .ajax() directly. api.jquery.com/jQuery.ajax There you can specify the exact content type and so on. In your scenario though if getJSON and $.toJSON works, then happy days :) — Nope
– Nope, Commented Sep 21, 2012 at 8:57

Stphane · Accepted Answer · 2012-09-21 08:28:01Z

3

You can give a try to JSON API ...

var data = {
   jsonCallbackID:jsonCallbackID,
   jsonCallbackValues: JSON.stringify(argumentValues),
   rndvalue: Math.floor(Math.random() * 10000000001)
};
// your 
$.getJSON(url, data, function (data) {});

answered Sep 21, 2012 at 8:28

Stphane

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1 Comment

Arthur Over a year ago

I did this indeed, the result is a comma seperated list in the jsonCallbackValues argument, guessing from Spekdrum's answer below, this is the way to go. Thanks!

spekdrum · Accepted Answer · 2012-09-21 08:23:38Z

2

JSON is a serialized language, so you can't put objects inside.

You should build your array in JSON format:

jsonCallbackValues : ["value1", "value2"...]

answered Sep 21, 2012 at 8:23

spekdrum

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Arthur Over a year ago

Thanks! I did try something similar as a workaround, but it seems from your question that this is the only option I have.

Murali Murugesan · Accepted Answer · 2012-09-21 08:36:50Z

2

Try like this

var data = ({ jsonCallbackID: jsonCallbackID, jsonCallbackValues: $.toJSON(argumentValues), rndvalue: Math.floor(Math.random() * 10000000001) });

I have used a JSON jQuery plugin from http://code.google.com/p/jquery-json/

In the controller method change it to string jsonCallbackValuesArray

Then use JavaScriptSerializer orJSON.Net to convert the JSON string into String []

answered Sep 21, 2012 at 8:36

Murali Murugesan

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1 Comment

Arthur Over a year ago

Yeah, this is similar to the answer above, I'm serializing / de-serializing in a similar fashion now. But thank you!

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