[OpenLayers-Users] wfs stylemap example?

[Arnd Wippermann]

Hi Alexandre,

i have also tried your example and get it working for me. Also for the
'select' rule mentioned by Todd, but on the modifyFeature control instead on
the selectFeature control. I don't know why. Thanks for the example source.

To select a feature with hover you can set 'hover' to true for the
selectFeature control. See below.

It's the first time I tried the options for the selectFeature control in an
own application. They work great. Only 'shiftKey' is a bit awksome, because
if you don't hit the feature you zoom one level high.

Arnd Wippermann 

part from select-feature.html:

drawControls = {
    point: new OpenLayers.Control.DrawFeature(
        vectors, OpenLayers.Handler.Point
    ),
    line: new OpenLayers.Control.DrawFeature(
        vectors, OpenLayers.Handler.Path
    ),
    polygon: new OpenLayers.Control.DrawFeature(
        vectors, OpenLayers.Handler.Polygon
    ),
    select: new OpenLayers.Control.SelectFeature(
        vectors,
        {
            clickout: false, toggle: false,
            multiple: false, hover: false,
            toggleKey: "ctrlKey", // ctrl key removes from selection
            multipleKey: "shiftKey" // shift key adds to selection
        }
    )
};

for(var key in drawControls) {
    map.addControl(drawControls[key]);
}
 

-----Ursprüngliche Nachricht-----
Von: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org] Im
Auftrag von Alexandre Dube
Gesendet: Mittwoch, 30. Juli 2008 16:05
An: Brenningmeyer, Todd
Cc: Users at openlayers.org
Betreff: Re: [OpenLayers-Users] wfs stylemap example?

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

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