topic Re: JSON.parse - Passing variable into query.outfields. in ArcGIS JavaScript Maps SDK Questions

JSON.parse - Passing variable into query.outfields.

KeithAnderson — Tue, 27 Jan 2015 19:48:28 GMT

Friends:

I am trying to pass a variable into query.outfields.

When it is hard coded it works. Coming in as an object.

query.outFields = ["OBJECTID", "NAME"];

Passing in the JSON variable does not work.

query.outFields = JSON.parse(FieldNames); // "['OBJECTID', 'Name']" (value in query parameter through FFox)

I am getting a JSON error in the browser that says it cannot recognize the square bracket [ .

Any suggestions on how to pass in JSON variables into query.output would be great.

Keith

Re: JSON.parse - Passing variable into query.outfields.

JeffJacobson — Tue, 27 Jan 2015 20:46:02 GMT

I think the problem is the single quotes around OBJECTID and Name. JSON only allows double-quotes as string delimiters. You'll need to replace the single quote characters with double quotes.

Re: JSON.parse - Passing variable into query.outfields.

KeithAnderson — Tue, 27 Jan 2015 21:16:35 GMT

I have tried everything I know without any luck.

"extentlatlon":"[-93.45,44.93]", JSON.parse on that extent works.

"FeatureOutputFields":"[OBJECTID,NAME]" JSON.parse on those fields do not.

"FeatureOutputFields":"[“OBJECTID,NAME”]” No go

"FeatureOutputFields":"[“OBJECTID”,”NAME”]” No go

Thanks for the effort.

Re: JSON.parse - Passing variable into query.outfields.

NicholasHaney — Wed, 28 Jan 2015 13:25:55 GMT

The following method worked for me:

var temp = '{"FeatureOutputFields":["SQMI", "STATE_NAME", "STATE_FIPS", "SUB_REGION", "STATE_ABBR"]}';

var temp1 = JSON.parse(temp);

query.outFields = temp1.FeatureOutputFields;

You can test the application here: Edit fiddle - JSFiddle

Re: JSON.parse - Passing variable into query.outfields.

KeithAnderson — Wed, 28 Jan 2015 14:19:13 GMT

Thanks Nic.

I will remember your effort!

Jeff told me to try escape characters and I eventually got it going.

You'll need to escape the double quotes since the string is delimited by double quotes.

    "FeatureOutputFields": "[\"OBJECTID,NAME\"]"

This was the final result for me:

"FeatureOutputFields":"[\"OBJECTID\",\"NAME\"]"

Keith