[OpenLayers-Users] Best option for visualizing JSON

[Lehtonen, Mika]

Solved.

I added params: {random: Math.random()} to my request and now my 
application works also in IE7. Some caching problem? Known issue?

- mika -

Lehtonen, Mika kirjoitti:
> Hi again,
> actually I might have been barking the wrong tree. This is what seem not 
> to be working in IE7.
>
> function selectAll()        {
>                 req = OpenLayers.Request.issue({
>                 method: 'GET', url:'http://mydomain/my.php',
>                 headers:{"Content-Type": 
> "application/x-www-form-urlencoded"},
>                 callback: json
>                  });
>                 }
>
> It works at the start, but the second attempt in IE7 won't return 
> anything. So that's why the newly inserted row won't update my map. Is 
> there something wrong with that request?
>
> - mika -
>
> Lehtonen, Mika kirjoitti:
>   
>> Thanks Christopher,
>> for your answer. However, beacuse there's not so many points and I have 
>> to put this together quickly and because this is just a temporary 
>> solution, I ended up adding points onto a vector layer one by one. So 
>> here's the function that does that:
>>
>> function json(req) {
>>     g =  new OpenLayers.Format.JSON();
>>     vastaus = g.read(req.responseText);
>>     vlayer.destroyFeatures();
>>     for (i in vastaus) {
>>     piste = new OpenLayers.Geometry.Point(vastaus[i].x, vastaus[i].y);
>>     spot = new OpenLayers.Feature.Vector(piste,{id: vastaus[i].id});
>>     vlayer.addFeatures(spot);
>>     }
>>      // vlayer.redraw(true);
>>     }
>>
>> Behind this, is an OpenLayers.Request that requests the json from 
>> database using php-script for that. I also have a function which adds 
>> points to the database. This all works fine in FF3, but not in IE7. If I 
>> add a point in IE, it won't appear until I restart the browser. Even 
>> reloading the page won't help. Still if, after I have added the point in 
>> IE, I reload the page in FF3, the newly added point appears in it.
>> Any idea what's wrong?
>>
>> - mika -
>>
>> Christopher Schmidt kirjoitti:
>>   
>>     
>>> On Wed, Jan 07, 2009 at 11:28:37PM +0200, Lehtonen, Mika wrote:
>>>   
>>>     
>>>       
>>>> Hi,
>>>> I have some JSON data produced from an "ordinary" database. Basically 
>>>> it's an array having objects that include x-, y- and some attribute values.
>>>>
>>>> What would be the best way to render these x-, y-values as points or 
>>>> markers in Openlayers. Should I use Marker or Vector or what layer? Any 
>>>> Examples?
>>>>     
>>>>       
>>>>         
>>> I'd recommend turning the data into GeoJSON on the server, then using a
>>> Vector Layer with the HTTP Protocol and the GeoJSON format
>>> (alternatively, a GML Layer with a GeoJSON format). If you really can't
>>> do that, then you could write a custom subclass o the JSON format,
>>> basing it of something like the GeoJSON format, and follow either of the
>>> above options with your custom format.
>>>
>>> Regards,
>>>   
>>>     
>>>       
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>>   
>>     
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