javascript - ASP.NET MVC receives "null" as a string instead of null - Stack Overflow

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I have something wrong with either json or ASP.NET MVC, I am using ASP.NET MVC and here is what I am sending from the client.

NOTE After debugging in Chrome, I am explaining that this is what is passed within javascript, I am not manually setting State to null as it is ing as result from somewhere else as null. Which once again is not in my control as it is ing from database.

While debugging, State displays that it is null, instead of "null", but while debugging in MVC it is displaying "null" instead of null.

$.ajax(
   '/Client/Post',
   {
       method: 'POST',
       data: {
                 Country: 'US',
    // this is null because it is ing from somewhere else as null
                 State: null
             }
   });

My ASP.NET MVC Handler receives...

public ActionResult Post(Client model){
    if(model.State == "null") 
    {
         /// this is true... !!!!
    }
    if(model.State == null )
    {
         // :( this should be true...
    }
}

Is it problem of ASP.NET MVC or jQuery?

So is it jQuery that sends null as "null" or is it MVC that is setting null as "null"?

SOLUTION

I had to just recursively create new object hierarchy (cloning the object) and send it to jQuery, as jQuery sent data as Form Encoded, in which there is no way to represent null, however ideally jQuery should not have serialized null at all.

I have something wrong with either json or ASP.NET MVC, I am using ASP.NET MVC and here is what I am sending from the client.

NOTE After debugging in Chrome, I am explaining that this is what is passed within javascript, I am not manually setting State to null as it is ing as result from somewhere else as null. Which once again is not in my control as it is ing from database.

While debugging, State displays that it is null, instead of "null", but while debugging in MVC it is displaying "null" instead of null.

$.ajax(
   '/Client/Post',
   {
       method: 'POST',
       data: {
                 Country: 'US',
    // this is null because it is ing from somewhere else as null
                 State: null
             }
   });

My ASP.NET MVC Handler receives...

public ActionResult Post(Client model){
    if(model.State == "null") 
    {
         /// this is true... !!!!
    }
    if(model.State == null )
    {
         // :( this should be true...
    }
}

Is it problem of ASP.NET MVC or jQuery?

So is it jQuery that sends null as "null" or is it MVC that is setting null as "null"?

SOLUTION

I had to just recursively create new object hierarchy (cloning the object) and send it to jQuery, as jQuery sent data as Form Encoded, in which there is no way to represent null, however ideally jQuery should not have serialized null at all.

• javascript
• jquery
• ajax
• asp-mvc

Share Improve this question Follow edited Jul 15, 2012 at 3:14 tereško 58.4k2525 gold badges100100 silver badges150150 bronze badges asked Dec 9, 2011 at 15:58 Akash KavaAkash Kava 39.9k2020 gold badges124124 silver badges171171 bronze badges 4

• read this one: stackoverflow./questions/801032/null-object-in-javascript – Davide Piras Commented Dec 9, 2011 at 16:02
• http://en.wikipedia/wiki/Http#Technical_overview – Esailija Commented Dec 9, 2011 at 16:02
• if you have to post data than put as json. see the link stackoverflow./questions/8442283/… – Dewasish Mitruka Commented Dec 9, 2011 at 16:10
• I am using both IE9, Chrome, Firefox, all same result. – Akash Kava Commented Dec 9, 2011 at 16:13

Add a ment  | 

3 Answers 3

Sorted by: Reset to default 6

Don't send the field:

$.ajax('/Client/Post',
{
   method: 'POST',
   data: {
             Country: 'US'
         }
});

---

Edit after I re-READ your post

var data = {
                 Country: 'US',
                 State: null
             }
if (!data.State) delete data.State;
$.ajax('/Client/Post',
    {
       method: 'POST',
       data: data
    }
});

This is the same exact principle as above FYI

jQuery does this. You can monitor the request by firebug fiddler, chrome dev helper, etc.

In this case, maybe you could use empty string instead of null:

data: {
    Country: 'US',
    State: ""
}

if you have to post data than use object as jSoN see the link

To pass whole JSON objects into controller of MVC

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