Take it easy Mohammed,
The strategy is usually combined with Protocol and/or Format Classes, it's
about 'time' and data. The Strategy class it's used to determine what to do
with a data returned from a protocol, before became visible in an layer.
See an example, that I found in a good book about OpenLayers, that I
recomend to buy or stfw (OpenLayers 2.10 - Begginer's Guide, by Erik
Hazzard, from PACKT Publishing):
*var vector_layer = new OpenLayers.Layer.Vector('More Advanced
Vector Layer',{*
* protocol: new OpenLayers.Protocol.HTTP({*
* url: 'some_data.json',*
* format: new OpenLayers.Format.GeoJSON({})*
* }),*
* strategies: [new OpenLayers.Strategy.Fixed()]*
*});*
*
*
*The above code would use the HTTP Protocol class and use the GeoJSON
format. Notice how the format is actually part of the protocol object. The
Fixed Strategy class is also used, which essentially just causes the vector
layer to request features once and never request new features again.*
Did you get it, now?
Cya,
Fernando G. Norte
BHte - MG
cel: +55 31 9119 8814
-------------------------
MSN e Gtalk # [email protected]
2011/12/13 Mohammed Rashad <[email protected]>
> i already read the openlayers documentation.Atleast you should think that
> people may have looked google search pages before asking to a list
> thanks for your help
>
> but I need more . OpenLayers people who developed it may have more idea on
> it
>
> I am waiting for them to answer....
>
>
> On Tue, Dec 13, 2011 at 7:34 PM, Ian Turton <[email protected]> wrote:
>
>>
>>
>> On 13 December 2011 13:20, Mohammed Rashad <[email protected]>wrote:
>>
>>> Hi All,
>>> Any one please tell me what is strategy?
>>> How it works?
>>> How to use it?
>>>
>>
>> *http://www.google.co.uk/search?q=openlayers+strategy*
>>
>> --
>> Ian Turton
>>
>>
>
>
> --
> Regards,
>
>
>
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>
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