[OpenLayers-Users] redraw or refresh a text layer?

[Eric Lemoine]

I was thinking about disabling caching only for that particular file.
Cheers. Eric

2008/5/29, Obe, Regina <robe.dnd at cityofboston.gov>:
> Eric,
>
> Actually I had suggested the below to Carl offlist.  The reason I
> suggested tacking the random to his location is that say you have a
> .txt file that gets automatically generated every so often.  A lot of
> web servers like IIS treat these kind of files as static and will send a
> directive to the web browser to cache them and then browsers.  They will
> not give a new version unless you fool them into thinking its a
> different file you are asking for by tagging a random seed on it. Also
> browsers have varying hockeyness on how they decide when to get a fresh
> copy or read from cache.
>
> True you could change the behavior if you had control of  the web server
> (which if you are on a shared box you don't necessarily). You would also
> take a performance hit on things that really should be cached.
>
> Just my two cents.
>
> Regina
>
> -----Original Message-----
> From: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org]
> On Behalf Of Eric Lemoine
> Sent: Wednesday, May 28, 2008 3:55 PM
> To: Carl Morgan
> Cc: users at openlayers.org
> Subject: Re: [OpenLayers-Users] redraw or refresh a text layer?
>
> On Tue, May 27, 2008 at 4:14 PM, Carl Morgan <carl.r.morgan at noaa.gov>
> wrote:
>> Regina,
>>
>> I got the following function to redraw the layer. Not sure I
> understand
>> why this works, but it does. I call it immediately after I call my
> init
>> function. I appreciate your help!
>>
>> -Carl
>>
>>        function refresh_markers() {
>>
>>            reports.redraw(true);
>>            map.removeLayer(reports);
>>            reports.destroy();
>>            reports = new OpenLayers.Layer.Text( "New Rep", {location:
>> "./" + textfile + "?" + Math.random()});
>>            map.addLayer(reports);
>>        }
>
> Are you saying that it doesn't work without the random() call?
>
> If the web server serving the text file is yours you should probably
> configure it to prevent browsers from caching that text file. To me
> this isn't a problem on the OpenLayers side.
>
> --
> Eric
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