[OpenLayers-Users] Combo Box for layers

[Martin Davis]

In the lines like:

 if (overl == pm09) {

the values need to be in quotes:

 if (overl == "pm09") {


On Tue, May 27, 2014 at 9:59 AM, Todd Fagin
<tfagin at coordinatesolutions.com>wrote:

> Thanks to Robert for this excellent suggestion. Nonetheless, I am still
> having problems getting this to work. For the life of me, I cannot figure
> out what I am doing wrong.
>
> Here is a sample of what I am trying to do:
> http://biosurvey.ou.edu/purple_martin/Simplified_Dropwdown_to_Share.html
>
> If anyone would kindly look at the code and point out where I have gone
> astray, it would be greatly appreciated.
>
> Many thanks in advance,
>
> Todd
>
> Todd Fagin
>
> Coordinate Solutions, Inc.
> 2804 NW 18th St.
> Oklahoma City, OK 73107
> 405.740.4324
> www.coordinatesolutions.com
>
> -----Original Message-----
> From: Robert Sanson [mailto:Robert.Sanson at asurequality.com]
> Sent: Sunday, May 25, 2014 4:51 PM
> To: Todd Fagin; openlayers-users at lists.osgeo.org
> Subject: Re: [OpenLayers-Users] Combo Box for layers
>
> Hi Todd
>
> Suppose you have some HTML for the combo box:
>
>  <p><select name="Layer" id="layer">
>     <option value="layer1">Layer 1</option>
>     <option value="layer2">Layer 2</option>
>     <option value="layer3">Layer 3</option>
>   </select>
>
> Then you have a Javascript function:
>
> function showoverlay() {
>   var overl = document.getElementById('layer').value;
>   if overl == layer1 {
>     l1.setVisibility(true);
>     l2.setVisibility(false);
>     l3.setVisibility(false);
>   }
>   else if overl == layer2 {
>     l1.setVisibility(false);
>     l2.setVisibility(true);
>     l3.setVisibility(false);
>   }
>   else if overl == layer3 {
>     l1.setVisibility(false);
>     l2.setVisibility(false);
>     l3.setVisibility(true);
>   }
> }
>
> where l1, l2, l3 are the overlay layers that have been added to the map.
>
> Regards,
>
> Robert
>
>
> >>> Todd Fagin <tfagin at coordinatesolutions.com> 23/05/2014 7:41 a.m. >>>
> Greetings OpenLayer users,
>
>
>
> I have what I assume is a fairly simple question, one that has likely been
> addressed previously. However, I have been unable to find the solution
> online. To add insult to injury, I am not a programmer. I can look at
> existing code and often modify it to my needs, but if I start with a blank
> slate, I usually end with a blank slate.
>
>
>
> So, here is my problem in a nutshell:
>
>
>
> I have a simple OpenLayers application that displays WMS layers from
> GeoServer plus several base layers (Google, Bing, etc.). Currently, it is
> configured with the standard LayerSwitcher. However, I would like to have a
> combo box from which users can select the overlay to display. It would be
> nice to have a default overlay set, then users could select from the
> dropdown list which overlay to display (for my purpose at hand, it is not
> necessary to display more than one overlay at a time-at least the overlays
> I
> wish to include in the combo box).
>
>
>
> Surely (I assume), this is something many individuals have done before.
>
>
>
> Keep in mind what I said above: I am not a programmer. So, if someone has
> some sample code I could cannibalize, I will be forever in your debt (well,
> maybe not forever, but.)
>
>
>
> Many thanks in advance,
>
>
>
> Todd
>
>
>
> Todd Fagin
>
>
>
> Coordinate Solutions, Inc.
>
> 2804 NW 18th St.
>
> Oklahoma City, OK 73107
>
> 405.740.4324
>
> www.coordinatesolutions.com
>
>
>
>
>
>
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