[Geojson] JSON.parse: unexpected character

Pedro Costa pedrocostaarma at sapo.pt
Wed Jul 11 10:04:10 PDT 2012


Thank you for the great explanations Michael and Tim.

Now i don't get this error but another ! I'm still don't view route.

Postgis returns the geojson with quoting i think this may be the error.

I'm attached a ss of firebug.

Anybody know the problem?

thanks




Em 11-07-2012 17:43, Michael Geary escreveu:
> The JSON.parse() error means just what it says: there is an unexpected 
> characer in your JSON data.
>
> You didn't show us the JSON data itself, but the screenshot has enough 
> of a clue about what went wrong.
>
> Look at the call frame at the top of the stack: your nativeJSON() 
> function. The variable named 'a' contains your JSON data, yes?
>
> Look at that JSON string. It starts with several newlines 
> (Windows-style newlines with \r\n), followed by:
>
>     <--det...
>
> That is the beginning of an HTML comment. It is not JSON.
>
> Why is that in your JSON data? Look at your PHP file. It begins with a 
> <?php section, but then it *ends* that section with ?> followed by 
> this HTML comment:
>
>     <!--determinar inicio e fim da rota-->
>
> There is your bad JSON data.
>
> The fix is easy. Here is what you should do whenever you write a PHP 
> file that generates JSON or any other non-HTML format:
>
> 1) Make sure the very first line of the file is <?php as you already have.
>
> 2) Do not end the PHP code with ?> anywhere. Don't even use ?> at the 
> end of the file! Yes, that's right, don't use it at the end of the 
> file. It is not required, and using it at the end of the file is 
> likely to add an unnecessary newline because in most editors you'll 
> probably have a newline after the ?>.
>
> Those two rules insure that your entire PHP file is pure PHP code and 
> does not have any spurious HTML code or HTML comments sneaking into 
> your output data.
>
> Of course, you will also now need to change your HTML comments to PHP 
> // comments.
>
> That should fix the JSON parsing error. At least it will insure that 
> what the PHP code outputs is what you expect it to output.
>
> -Mike
>
> On Wed, Jul 11, 2012 at 4:53 AM, Pedro Costa <pedrocostaarma at sapo.pt 
> <mailto:pedrocostaarma at sapo.pt>> wrote:
>
>     Hello,
>
>     This is my first mail to this list.
>
>     I have a php script that have to return to client a geojson layer
>     but it gives me this error in firebug:
>
>     JSON.parse: unexpected character (screen shot attached)
>
>
>     the php code is that:
>
>     http://pastebin.com/tSCv5cnT
>
>
>     Can somebody help me with the error?
>
>     thanks
>
>
>
>
>
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>


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