[mapserver-users] Query feature using openlayers and mapserver

Thu Oct 29 18:33:46 PDT 2009

P Kishor wrote:
> 
> On Thu, Oct 29, 2009 at 1:13 AM, Aypes <apestgas at yahoo.com.hk> wrote:
> Here is how I did it, and it worked for me (test for typing errors)
> 
> Step 1: In the map file
> 
> Step 1a: WEB
> 
>     WEB
>     ,,
> 
>         # WMS server settings
>         METADATA
>             ..
>             "wms_feature_info_mime_type"    "text/html"
>         END
>     END # WEB
> 
> Step 1b: LAYER to be queried
> 
>     LAYER
>         NAME 'layer_name'
>         ..
> 
>         METADATA
>            ..
>             'wms_include_items' "FiEld_NaMe"   # field name is possibly
>                                                # case-sensitive in the
> case of
>                                                # shape files
>         END # METADATA
> 
>         DUMP true
>         HEADER "/absolute/path/to/template_header.html"
>         TEMPLATE "/absolute/path/to/template_body.html"
>         FOOTER "/absolute/path/to/template_footer.html"
>     END # LAYER
> 
> Step 2: In your HTML templates
> 
> Step 2a: in template_header.html
> 
> <!-- MapServer Template -->
> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
>        "http://www.w3.org/TR/html4/transitional.dtd">
> <html>
>   <head>
>     <title>MapServer Template Sample</title>
>   </head>
> 
> Step 2b: in template_body.html
> 
>   <body>
>     FiEld_NaMe: [FiEld_NaMe]
>   </body>
> 
> Step 2c: in template_footer.html
> 
> </html>
> 
> Step 3: In your HTML file with OpenLayers code
> 
>         map.addControl(
>             new OpenLayers.Control.WMSGetFeatureInfo(
>                 function() {
>                     return {
>                         url: "/url/to/mapserv",
>                         maxFeatures: 1,
>                         title: 'Identify features by clicking',
>                         queryVisible: true,
>                         layers: [layer_name],
>                         vendorParams: {
>                             map: "/absolute/path/to/mapfile"
>                         },
>                         eventListeners: {
>                             getfeatureinfo: function(event) {
>                                 map.addPopup(
>                                     new OpenLayers.Popup.FramedCloud(
>                                         "chicken",
>                                         map.getLonLatFromPixel(event.xy),
>                                         null,
>                                         event.text,
>                                         null,
>                                         true
>                                     ),
>                                     true
>                                 ); // map.addPopup
>                             } // getfeatureinfo
>                         } // eventListeners
>                     } // return
>                 }
>             )
>         ).activate();
> 
> 
> 
> -- 
> Puneet Kishor http://www.punkish.org
> Carbon Model http://carbonmodel.org
> Charter Member, Open Source Geospatial Foundation http://www.osgeo.org
> Science Commons Fellow, http://sciencecommons.org/about/whoweare/kishor
> Nelson Institute, UW-Madison http://www.nelson.wisc.edu
> -----------------------------------------------------------------------
> Assertions are politics; backing up assertions with evidence is science
> =======================================================================
> Sent from Madison, WI, United States
> _______________________________________________
> mapserver-users mailing list
> mapserver-users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/mapserver-users
> 
> 
P Kishor,

Thank you for answering. But I have some problems.
I want to know that in map file, [TEMPLATE
"/absolute/path/to/template_body.html"] is ouside or inside the class of the
layer?

Secondly, for the part
map.addPopup(
new OpenLayers.Popup.FramedCloud(  "chicken", 
map.getLonLatFromPixel(event.xy),   null,            event.text,     null,      
true)
I just do not understand the structure of it even though I have searched it
on Internet. Should "chicken" change to the layer name, and where/what is
event.txt?

Thirdly there is some problem on activate(). I got an error of
'map.addControl(...)' is null or not an object. If I detele activate(), it
works without the getfeatureinfo property. But I have no idea on how to
activate it.

And I am using OpenLayers.layer.Mapserver to render map, not
OperLayers.layer.WMS. Does new OpenLayers.Control. WMSGetFeatureInfo still
work?

Thanks,
Aypes
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