MVC: While retrieving the passed Json object from controller in view, JavaScript error

Question

I'm passing some string messages as Json object in view.

public ActionResult SomeAction(someObject object)
{            
    .....
    .....
    
    if (check1)
    {
        return Json(new { error = Resource.someMessage1},JsonRequestBehavior.AllowGet);
    }
    if(check2)
    {
        return Json(new { error = Resource.someMessage2}, JsonRequestBehavior.AllowGet);
    }
 
    //some stuffs

    return Json(new {success = "success"}, JsonRequestBehavior.AllowGet);
}

I want to retrieve the messages passed from controller and alert from My view

in view I have some javascript

function done(data) {
    alert("hello");
    var message = JSON.parse(data);
    alert(message);
    if (message["error"] != undefined) {
        alert(message["error"]);
    } else {
     //do some stuff

    }
};

what I was expecting is if passed message from controller is type error then I would get alert with the message.

The line alert("hello"); but there is no alert after that. I get error in console

enter image description here

Am I doing something wrong?

console the value present in the "data" and share it here, want to know what is passed to this done() function. — Yasser Shaikh
– Yasser Shaikh, Commented Mar 26, 2014 at 8:34
You mean the response sent? If yes, then this is what I see as response in browser {"error":"somemessage"}. If no, I probably didn't understand what u meant, sorry. Quite new to this front end thing — Cybercop
– Cybercop, Commented Mar 26, 2014 at 8:39
@AvinashKothamasu but when I alert data I get [object object] as alert — Cybercop
– Cybercop, Commented Mar 26, 2014 at 8:40

Yasser Shaikh · Accepted Answer · 2014-03-26 08:38:42Z

2

If you execute the following line of code

var a = { success : "success" };
var b = JSON.parse(a);

you will get the error you have mentioned about "SyntaxError: Unexpected token o..."

Don't know why are you trying to convert your already JSON object using JSON.parse(), instead you could use this

a.success

to read the "success" value .

answered Mar 26, 2014 at 8:38

Yasser Shaikh

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Comments

Faiz Mohamed Haneef · Accepted Answer · 2014-03-26 08:46:34Z

1

the variable type is detected as json object.

var x = {"error":"somemessage"};
alert(x.error)

The variable is detected as String here.

var x = JSON.parse('{"error":"somemessage"}'); alert(x.error)

If you notice, the difference is #1 starts with {(curly braces) whereas #2 starts with '(apostrophe)

answered Mar 26, 2014 at 8:46

Faiz Mohamed Haneef

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pawels · Accepted Answer · 2014-03-26 08:40:23Z

0

Try not parsing the answer (so remove "JSON.parse(data)" line) and read everything directly from "data" variable.

answered Mar 26, 2014 at 8:40

pawels

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Sai Avinash · Accepted Answer · 2014-03-26 08:42:04Z

0

You have to use data.sucess to get your result . There is no need to parse again.

answered Mar 26, 2014 at 8:42

Sai Avinash

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