javascript var assign a dynamic nullable value shows script error

Question

I have a JSON string returned from my asp.net mvc3 application controller using viewbag key as below, depending on various scenarios it can be null too

{"Name":"TShirt","Id":"85","Gender":"M","Size":"Medium"}

and I am trying to assign this JSON object to my local anonymous variable as shown below:

    var data = '@ViewBag.UserData';

The above ViewBag is null on initial page load, but as the user keys in the criteria, I store this into a session variable. Whenever user selects a product and clicks on back to previous page link, I restore these filters froms session and place them in Viewbag for further processing on the View.

This is working perfectly fine when user clicks back to previous page , but I see a script error on the initial load because the var data = '@ViewBag.UserData'; evaluates to var data = ;

I tried the below too but am still seeing the error

var data = '@ViewBag.UserData' != '' ? @Html.Raw(@ViewBag.UserData): {};

I tried

var data = '@ViewBag.UserData' != '' ? '@Html.Raw(@ViewBag.UserData)': {};

but I am unable to parse the data that I get in the back to previous page scenario. Am I doing something wrong here?

If you do @ViewBag.UserData without quotes when using ternary? — trainoasis
– trainoasis, Commented Jan 13, 2015 at 7:23
it evaluates to something like this and still a script error var data = '' != '' ? : {}; — TRR
– TRR, Commented Jan 13, 2015 at 7:24
the above comment output is for var data = '@ViewBag.UserData' != '' ? @Html.Raw(@ViewBag.UserData): {}; — TRR
– TRR, Commented Jan 13, 2015 at 7:27

Rama Rao M · Accepted Answer · 2015-01-13 07:33:44Z

1

I am not so clear that what you really wanted. But as per my understanding, I think you are looking for JSON parser.

var str = '{"one":"1","two":"2"}';
console.log(str); // Prints string
var obj = JSON.parse(str); //Converts string to JSON object
console.log(obj); // Prints JSON object

answered Jan 13, 2015 at 7:33

Rama Rao M

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TRR Over a year ago

Rama Rao, exactly what I wanted. I tried $.parseJson but it didnt work, so I thought parsing isn't the right approach. I must have done a mistake while trying to parse

erakm · Accepted Answer · 2015-01-13 07:41:28Z

0

You can try replace '' to null or {} . May be the code works.

var data = '@ViewBag.UserData' != **null or {}** ? '@Html.Raw(@ViewBag.UserData)': {};

answered Jan 13, 2015 at 7:41

erakm

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