[OpenLayers-Users] wfs stylemap example?

Wed Jul 30 10:04:40 EDT 2008

Hi Todd,

  You're right.  That would be the good way to set a color to a selected 
feature.  But first I suggest you to pick an other color than blue 
because it is the default color for "select".

  Second, you actually have to select it, like with a selectFeature or 
modifyFeature control.  By clicking on it, it will change your color.  
See the example : http://openlayers.org/dev/examples/modify-feature.html

  About the "hover" stuff, anybody correct me if I am wrong, but I would 
try to register an event with "mousemove" that would call the 
clickFeature function in the selectFeature.js file ( or an other 
function that does the same thing ).  Instead of having to click on the 
feature directly, being over it would select it and change its color.

  But, that would be annoying because if you would actually want to 
select it ( and keep it selected ) you would not be able to because as 
soon as your mouse would not be over it, it would be unselected.

  Hope this can be of any help,

Brenningmeyer, Todd wrote:
> Thanks so much!!! That's just what I was looking for.  My features are now displaying as I'd hoped.  Is it difficult to extend this to change features that are selected onhover?  I added:
> var selrules = [new OpenLayers.Rule({
> symbolizer: {strokeColor:"blue",strokeWidth: 2},
> elseFilter: true
> })];
> oStyleMap.styles["select"].addRules(selrules);
>
> to your .js file but nothing happens when I hover over the points (it's a bit gawdy but I just wanted to see if it would work).  I think I need to add a control but haven't tried this before.  Will this work?  The points aren't currently changing.  Are there additional considerations that I need to think about.  I'm just trying to port my old mapserver interface to openlayers and any help is appreciated.  Thanks again,
> Todd
>
> -----Original Message-----
> From: Alexandre Dube [mailto:adube at mapgears.com]
> Sent: Tue 7/29/2008 3:22 PM
> To: Brenningmeyer, Todd
> Cc: Users at openlayers.org
> Subject: Re: [OpenLayers-Users] wfs stylemap example?
>  
> Hi Todd,
>
> I have some to share. My WFS layer contains line features ( roads ) and 
> they have different color depending on their type ( Local road, Highway, 
> etc ). I hope this can be of any help :
>
> ============= otherfile.js =============
>
> // prepare to style the data
> var oStyleMap = new OpenLayers.StyleMap();
>
> // Array of symbolizer and other values for ROL_CO_CLA attribute
> // this will be used to create a html select list and will be used
> // as the symbolizer array for the addUniqueValueRules function
> // sorry, there's some french words here :)
> var aRoadType = new Array();
> aRoadType = {
> AUT: {
> text: "Autoroute",
> strokeColor: "#ff0000", strokeWidth: 3 },
> NAT: {
> text: "Nationale",
> strokeColor:"#ff8c00", strokeWidth: 2 },
> REG: {
> text: "Régionale - Reg",
> strokeColor:"#ff8c00", strokeWidth: 2 },
> COL: {
> text: "Régionale - Col",
> strokeColor:"#ff8c00", strokeWidth: 2 },
> ACC: {
> text: "Locale - Acc",
> strokeColor:"#d2b48c", strokeWidth: 2 },
> LOC: {
> text: "Locale - Loc",
> strokeColor:"#d2b48c", strokeWidth: 2 },
> ACH: {
> text: "Chemin forestier - Ach",
> strokeColor:"#734c00", strokeWidth: 2 },
> MRN: {
> text:"Chemin forestier - Mrn",
> strokeColor:"#734c00", strokeWidth: 2 }
> }
>
> // a style will applies to each drawned vector feature depending on
> // the ROL_CO_CLA attribute value. It will match the good value and applies
> // the corresponding symbolizers
> oStyleMap.addUniqueValueRules("default", "ROL_CO_CLA", aRoadType);
>
> // If no rules applies to the current vector feature, that means it's
> // not a road, but an other type of feature like a circle for drag
> // control. The "elseFilter: true" is used to display those vectors.
> var rules = [new OpenLayers.Rule({
> symbolizer: {strokeColor:"#FF0000",strokeWidth: 2},
> elseFilter: true
> })];
> oStyleMap.styles["default"].addRules(rules);
>
> ============= yourHTMLFile.html =============
>
> --- inside your <head> section ---
> <script src="otherfile.js"></script>
>
> --- inside your init() function ---
>
> OpenLayers.Feature.Vector.style['default']['strokeWidth'] = '2';
>
> // then some variables... map definition... base layer ... some WMS 
> layers ... and :
>
> olWFSRoads = new OpenLayers.Layer.WFS(
> "Roads - WFS", sMSURL,
> { typename: "roads", map: sMapPath },
> { extractAttributes: true, minScale: 49999,
> typename: "roads", styleMap: oStyleMap
> }
> );
>
> // then addlayers, controls, etc. and your <body>
>
> Brenningmeyer, Todd wrote:
>   
>> Hello,
>> Does anyone have an example code snippet that shows how to use a stylemap with wfs data that is being served as vectors (I'm trying to serve up points).  I've been trying to get this to work using some of the examples on the wiki but I can't quite get the syntax to work properly.  If anyone has ideas or an example that would be great.  
>> Thanks,
>> Todd
>> _______________________________________________
>> Users mailing list
>> Users at openlayers.org
>> http://openlayers.org/mailman/listinfo/users
>>   
>>     
>
>
>   

-- 
Alexandre Dubé
Mapgears
www.mapgears.com