[OpenLayers-Users] Importing JSON to WKT

[Joel Leininger]

Found something that works (sort of) but in a way I don't think it should
have to. If I use eval() inside the read statement, it works:

var polygone = parcer.read(eval(updateOutput[0]));

That works. But I'm under the impression that eval() is a bad, bad thing
from a security standpoint. Is this safe code to use in a production
environment?



On Tue, Jul 10, 2012 at 3:24 PM, Joel Leininger <leiningr at gmail.com> wrote:

> Firebug says polygone remains undefined, as if the line of code were
> ignored. No error message is thrown. In experimenting yesterday, I cut and
> pasted the Multipolygon string into the parcer.read line and it worked.
> Then I created a variable called wktTest and assigned the Multipolygon
> string to it, then ran
>
> var polygone = parcer.read(wktTest);
>
> and it didn't work: polygone remained unassigned. Now that last test would
> seem to indicate that Json is not part of the issue here, but something
> having to do with that read property. No variable would work; all literal
> strings, however, moved the geometry object to polygone.
>
> The coordinates are correct, by the way. All the translations happen at
> the postgis level, and when I pass a Multipolygon literal string it plots
> in the correct place on the map. On that score we're good.
>
> I'm just stumped on that read statement quirkiness.
>
>
>
> On Tue, Jul 10, 2012 at 2:43 PM, Greg Allensworth <gregor at greeninfo.org>wrote:
>
>> On 7/10/2012 11:21 AM, Joel Leininger wrote:
>>
>>> Okay, here is that output:
>>>
>>> Object { status="added", numResults=1, 0=[1]}
>>> ["MULTIPOLYGON(((-8528843...**591 4765443.37168208)))"]
>>>
>>> That looks right to me. Not sure of the nomenclature "0=[1]" but [1]
>>> could reflect the wkt object. The second line is what I'm trying to feed
>>> into the read statement, and it looks correct -- except the brackets.
>>> Does firebug add those or would they be in the json?
>>>
>>
>> The brackets indicate that it is an array. Which is good, as you were
>> expecting an array with 1 element, and for that one element to be a WKT
>> string.
>>
>> So, when it gets to this line, what does it do? What is the value of
>> polygone afterward? You mention that it doesn't process, but not what it
>> really DID.
>>
>>    new polygone = parcer.read(updateOutput[0]);
>>
>> Also, I notice that the coords in the WKT are not Lon/Lat coords; perhaps
>> Web Mercator? If you're expecting the coords to be in Web Mercator, that
>> looks right; if you're expecting latlon, you may want to double-check.
>>
>>
>> --
>> Greg Allensworth, Web GIS Developer
>> BS  A+  Network+  Security+  Linux+  Server+
>> GreenInfo Network - Information and Mapping in the Public Interest
>> 564 Market Street, Suite 510  San Francisco CA 94104
>> PH: 415-979-0343 x302  FX: 415-979-0371    email: gregor at greeninfo.org
>> Web: www.GreenInfo.org     www.MapsPortal.org
>>
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>>
>>
>>
>
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