[OpenLayers-Users] Refresh an indepent Layer... every n seconds...

Fri Aug 1 13:36:37 EDT 2008

Arnd,

This is exactly what i tell him to do. Use global variables. And for 
your information, yes MapServer layer has a redraw() function. It 
inherit from HTTPRequest layer.

Regards,
Alan

Arnd Wippermann wrote:
> Sorry, counter has to be in lowercase and I have thought the layer 
> would be a WMS layer. For Mapserver layers there seems not to exist a 
> redraw function. Perhaps this will work:
>  
> add counter to the params of your Mapserver layer and in your redraw 
> function use recorridos.params.counter++;
> This should change the url for your request, but i don't know, wether 
> this updates the layer.
>  
> Otherwise i have no idea.
>  
> Arnd
>  
>  
> <html>
>   <head>
>     <style type="text/css">
>         #map {
>             width: 900px;
>             height: 600px;
>         }
>      </style>
>     <title>Sistema de Trasporte Urbano  - Cuenca Ecuador </title>
>     <script src="OpenLayers.js"></script>
>     <script type="text/javascript">
>  
>         //the global variables
>         var map;
>         var recorridos;
>         var counter=0;
>        
>         function init()
>         {
>             var mapOptions = {
>             maxExtent: new OpenLayers.Bounds(713620.5057, 
> 9673754.1986, 732936.3635, 9687405.8116),
>             maxResolution: 'auto',
>             projection:"EPSG:32717",
>             units: "m"};
>  
>             var map = new OpenLayers.Map('map', mapOptions);
>             map.addControl(new OpenLayers.Control.LayerSwitcher());
>             var panel = new OpenLayers.Control.NavToolbar();
>             map.addControl(panel);
>              map.addControl(new 
> OpenLayers.Control.MousePosition({'div':OpenLayers.Util.getElement('coords')}));
>  
>         var manzanas = new OpenLayers.Layer.MapServer.Untiled( 
> "manzanas", "../../cgi-bin/mapserv",
>             {map:'C:/data/publicacion.map',
>             layers: 'manzanas',map_imagetype: 'png'}, 
> {'displayInLayerSwitcher':false});
>  
>         var ruta22 = new OpenLayers.Layer.MapServer.Untiled( "Ruta 
> 22", "../../cgi-bin/mapserv",
>             {map:'C:/data/publicacion.map', transparent: "true",
>             layers: 'ruta22_ida',map_imagetype: 'png'},{'isBaseLayer': 
> false}, {'displayInLayerSwitcher':false});
>  
>         recorridos = new OpenLayers.Layer.MapServer.Untiled( 
> "Unidad()", "../../cgi-bin/mapserv",
>             {map:'C:/data/publicacion.map',
>             layers: 'recorrido',transparent: "true", map_imagetype: 
> 'png', 'counter':0});
>               ruta22.setVisibility(false);
>  
>             map.addLayers([ruta22, manzanas, recorridos]);
>             if (!map.getCenter()) map.zoomToMaxExtent();
>             setTimeout("Layer_redraw()",10*1000);
> }
>  
> function Layer_redraw() { 
>     //this is only for WMS layer
>     //recorridos.mergeNewParams({ counter : counter++ });
>     recorridos.params.counter++;
> }
>  
>   </script>
>   </head>
>   <body onLoad="init()">
>     <table>
>       <tr>
>         <td align="left"><div id="map"></div></td>
>       </tr>
>   </table>
>   </body>
> </html>
> ------------------------------------------------------------------------
>
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-- 
Alan Boudreault
Mapgears
http://www.mapgears.com