Setting JSON key from a variable?

[Mark Smith]

Hi,

I am trying to build a json object from a predefined variable. But the
variable name is being interpreted as a literal string rather than the
contents of the variable.

For example the following code displays "NONE" rather than the
contents of the variable "_nothingselected_":

<script>
var NONE="_nothingselected_";
var jsonOptions={ NONE : "Please Select" };
for(index in jsonOptions)
{
alert(index);
}
</script>

What is the correct way to do this?

Thanks

 

[Jorge]

Hi,

I am trying to build a json object from a predefined variable. But the
variable name is being interpreted as a literal string rather than the
contents of the variable.

For example the following code displays "NONE" rather than the
contents of the variable "_nothingselected_":

<script>
var NONE="_nothingselected_";
var jsonOptions={ NONE : "Please Select" };
for(index in jsonOptions)
{
 alert(index);}

</script>

What is the correct way to do this?

var jsonOptions= {};
jsonOptions[NONE]= "Please Select";

 

[Thomas 'PointedEars' Lahn]

I am trying to build a json object from a predefined variable. But the
variable name is being interpreted as a literal string rather than the
contents of the variable.

For example the following code displays "NONE" rather than the
contents of the variable "_nothingselected_":

<script>

var NONE="_nothingselected_";
var jsonOptions={ NONE : "Please Select" };
for(index in jsonOptions)
{
alert(index);
}
</script>

What is the correct way to do this?

var jsonOptions = {};
jsonOptions[NONE] = "Please Select";

Asked at least a hundred times already, and well-documented. RTFM, RTFFAQ,
STFW.

<http://jibbering.com/faq/#posting>

See also: <https://developer.mozilla.org/En/Using_native_JSON>.


PointedEars

 

[Jorge]

Hi,

I am trying to build a json object from a predefined variable. (...)

BTW, JSON is a *text* format. There's no such thing as a JSON object :
data can be formatted as a JSON *text*.

http://json.org/
http://www.ietf.org/rfc/rfc4627.txt

 

[Jorge]

data can be formatted as a JSON *text*.

Formatted, serialized, or the less pompous term chosen by Crockford:
stringify(ed) : see 15.12.3 in the ES5 draft:
http://www.ecma-international.org/publications/files/drafts/tc39-2009-025.pdf