[OpenLayers-Users] Cannot read property 'yx' of undefined

Fri Oct 18 07:30:37 PDT 2013

Ian,

That’s correct, it’s always XY for EPSG:27700, which is why I was trying to set the value to ‘false’.

I’ve just tried taking out the CRS line, but that doesn’t make any difference either. You’re correct that it’s not needed though as OL does appear to add it in for me, but I’m still getting the yx undefined error.

-- 
Dylan Parry

Blue Fox Technology Ltd
Tel: 01492 532100
Web: http://www.bluefoxtech.co.uk

Registered in England and Wales, Company No. 0508226.
Registered office: Windsor House, 26 Mostyn Avenue, Craig-Y-Don,
Llandudno, Conwy LL30 1YY

From: Ian Turton
Sent: ‎Friday‎, ‎18‎ ‎October‎ ‎2013 ‎15‎:‎29
To: jawendell at suddenlink.net
Cc: Dylan Parry, openlayers-users at lists.osgeo.org

I don't think that page applies to EPSG:27700 which is always XY (no matter which WMS version). 

Dylan, 

Have you tried taking the CRS: line out of your code? OpenLayers should fill that in for you from the map object.

Ian

On 18 October 2013 15:23, Jerome A. Wendell <jawendell at suddenlink.net> wrote:

Dylan,

Have you looked at the following page in the documentation:

http://docs.geoserver.org/stable/en/user/services/wms/basics.html#differences-between-wms-versions

Jerome Wendell

From: Dylan Parry [mailto:dylan.parry at bluefoxtech.co.uk] 
Sent: Friday, October 18, 2013 10:12 AM
To: openlayers-users at lists.osgeo.org; jawendell at suddenlink.net
Subject: Re: [OpenLayers-Users] Cannot read property 'yx' of undefined

Hi,

That’s similar to what I tried before, ie.

yx: { ‘EPSG:27700’: false }

Strangely, the error goes away when I set the above to ‘true’ but then of course the coordinates are all wrong so the tiles won’t load. I can’t understand why setting it to false would bring up an error when false is still a valid value?

-- 
Dylan Parry

Blue Fox Technology Ltd
Tel: 01492 532100
Web: http://www.bluefoxtech.co.uk

Registered in England and Wales, Company No. 0508226.
Registered office: Windsor House, 26 Mostyn Avenue, Craig-Y-Don,
Llandudno, Conwy LL30 1YY

From: Jerome A. Wendell
Sent: ‎Friday‎, ‎18‎ ‎October‎ ‎2013 ‎13‎:‎25
To: Dylan Parry, openlayers-users at lists.osgeo.org

Dylan,

I have added the following to the same section of code that you referred to for some of my layers:

yx : {'EPSG:4326' : true}

See if adapting it to your projection makes any difference.

Jerome Wendell

From: openlayers-users-bounces at lists.osgeo.org [mailto:openlayers-users-bounces at lists.osgeo.org] On Behalf Of Dylan Parry
Sent: Friday, October 18, 2013 8:06 AM
To: openlayers-users at lists.osgeo.org
Subject: [OpenLayers-Users] Cannot read property 'yx' of undefined

Hi,

I’m trying to use a WMS with the EPSG:27700 projection. The WMS uses version 1.3.0, which is causing a few problems. I have got to a point where I cannot figure out what’s wrong.

I am currently getting the following error:

Cannot read property ‘yx’ of undefined

and having read up a little, it appears that it’s due to the WMS version wanting to know whether to reverse the coordinates or not for the bbox parameter, but as the projection is unknown to OpenLayers there’s no yx property to query.

My problem is that I have no idea where to add that property to.

Here’s the code I have so far:

<script src="~/Scripts/proj4js.js"></script>
<script>
    Proj4js.defs["EPSG:27700"] = "+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +datum=OSGB36 +units=m +no_defs";
</script>
<script src="/Scripts/openlayers/openlayers.js"></script>
<script>
    var map, opus;

    function init() {
        OpenLayers.ImgPath = "/Scripts/openlayers/img/";

        var options = {
            maxExtent: new OpenLayers.Bounds(0, 0, 700000, 1300000),
            restrictedExtent: new OpenLayers.Bounds(0, 0, 700000, 1300000),
            projection: new OpenLayers.Projection('EPSG:27700'),
            units: 'm',
            scales: [10000, 25000, 50000, 75000, 100000, 150000, 175000, 200000],
            controls: [
                new OpenLayers.Control.Navigation({ 'zoomWheelEnabled': false }),
                new OpenLayers.Control.MousePosition(),
                new OpenLayers.Control.PanZoomBar(),
                new OpenLayers.Control.LayerSwitcher()
            ]
        };

        map = new OpenLayers.Map('map', options);

        opus = new OpenLayers.Layer.WMS(
            'OpenStreetMap via Opus',
            'http://server/wms',
            {
                layers: 'OpenStreetMap',
                version: '1.3.0',
                crs: 'EPSG:27700',
                format: 'image/png',
            },
            {
                isBaseLayer: true,
                transitionEffect: 'resize'
            }
        );
        map.addLayer(opus);

        map.zoomToMaxExtent();
        map.zoomToScale(10000, true);
        map.setCenter(new OpenLayers.LonLat(195775, 223755));
    }
</script>

I also have an onload event that calls the init() function to draw the map on the page.

Any idea how to fix the error I’m getting? I’ve tried adding an xy property to the WMS bit of the code where ‘isBaseLayer’ is defined, but that didn’t seem to work.

Thanks,

-- 
Dylan Parry

Blue Fox Technology Ltd
Tel: 01492 532100
Web: http://www.bluefoxtech.co.uk

Registered in England and Wales, Company No. 0508226.
Registered office: Windsor House, 26 Mostyn Avenue, Craig-Y-Don,
Llandudno, Conwy LL30 1YY

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-- 
Ian Turton
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