Parse Json Object

Question

I have an List error Entity which I used to pass errorId and error message to the UI layer.

   public class ErrorEntity
    {
       public int ErrorId
       {
           get;
           set;
       }

       public string ErrorMessage
       {
           get;
           set;
       }
    }
}

I send the object to the Javascript I am serializing it to JSON.

The Json I am getting after serialization look like

[{"ErrorId":1,"ErrorMessage":"Test has not been prepared for tag EP105"},{"ErrorId":2,"ErrorMessage":"Test has not been prepared for tag EP105"}]

Now I need to parse this Json string to show the error message to the user. Please let me know how can I parse it. Do I need to write a for loop to traverse with in it.

EDIT In my master page I am trying to parse it.

function ShowErrorMsg(jsonObject) {  
  for (i = 0; i < jsonObject.Object.length; i++) { //Object is undefined here.
    alert(jsonObject.Object.ErrorMessage);
  }          
}

are you using any ajax based libraries like jquery? Some browsers have native ability to parse json string. Which is(are) your target browser(s) — deostroll
– deostroll, Commented Oct 23, 2011 at 10:55

Frédéric Hamidi · Accepted Answer · 2011-10-23 10:54:35Z

2

Prefer JSON.parse() if it's available:

var jsonArray = JSON.parse(serializedString);
window.alert(jsonArray[0].ErrorMessage);

Fall back to eval() otherwise:

var jsonArray = eval(serializedString);
window.alert(jsonArray[0].ErrorMessage);

answered Oct 23, 2011 at 10:54

Frédéric Hamidi

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3 Comments

Vaibhav Jain Over a year ago

What is the more preferred way of doing it. Would eval be safe?

Frédéric Hamidi Over a year ago

The preferred way to do it is to use JSON.parse(), which only parses the subset of Javascript used by JSON and is safer than eval().

Jamie Over a year ago

You should use a library like jQuery which should implement the fallback if your browser does not support JSON.parse().

deostroll · Accepted Answer · 2011-10-23 10:49:45Z

0

Try Json.NET

answered Oct 23, 2011 at 10:49

deostroll

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1 Comment

Vaibhav Jain Over a year ago

I am trying to parse it in my script file.

Yacov · Accepted Answer · 2011-10-23 11:48:32Z

0

There is support in most browsers for parsing json, I recommend to use jQuery for this - you also can take a look at this

Be aware - Its better to use a library - and not using JS for this (JS is from the devil ;) )

answered Oct 23, 2011 at 11:48

Yacov

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