topic Re: map.setExtent not setting right values in ArcGIS JavaScript Maps SDK Questions

map.setExtent not setting right values

MatejSkerjanc — Wed, 14 Mar 2012 05:56:32 GMT

var factor = 0;
var xtent =new esri.geometry.Extent(xmin-factor, ymin-factor, xmax+factor, ymax+factor)
map.setExtent(xtent);

alert(map.extent.xmin + ',' + map.extent.ymin + ',' +map.extent.xmax + ',' + map.extent.ymax );

I got this code, and the xtent of a map differs from the extent of xtent. Any practical reason behind it or is my code just faulty?

Re: map.setExtent not setting right values

JohnGrayson — Wed, 14 Mar 2012 14:44:44 GMT

You are probably reading the values before the map actually changes extent. I suggest you listen to the map.onExtentChange event and then get the map extent values.

var factor = 0;
var xtent =new esri.geometry.Extent(xmin-factor, ymin-factor, xmax+factor, ymax+factor)

var mapExtentChangeHandle = dojo.connect(map, 'onExtentChange', function(newExtent){
dojo.disconnect(mapExtentChangeHandle);

alert(dojo.replace("{xmin},{ymin},{xmax},{ymax}", newExtent);
alert(map.extent.xmin + ',' + map.extent.ymin + ',' +map.extent.xmax + ',' + map.extent.ymax);
});

map.setExtent(xtent);

Re: map.setExtent not setting right values

HemingZhu — Wed, 14 Mar 2012 15:38:52 GMT

var factor = 0;
var xtent =new esri.geometry.Extent(xmin-factor, ymin-factor, xmax+factor, ymax+factor)
map.setExtent(xtent);

alert(map.extent.xmin + ',' + map.extent.ymin + ',' +map.extent.xmax + ',' + map.extent.ymax );

I got this code, and the xtent of a map differs from the extent of xtent. Any practical reason behind it or is my code just faulty?

You might want to add sr parameter. list this: var xtent =new esri.geometry.Extent(xmin-factor, ymin-factor, xmax+factor, ymax+factor, map.spatialReference);

Re: map.setExtent not setting right values

MatejSkerjanc — Thu, 15 Mar 2012 05:33:30 GMT

I've used the SR it didn't help thank you though.

I'll go with jgraysons and see if his help.

I'll report back guys thank you for now.

Re: map.setExtent not setting right values

MatejSkerjanc — Thu, 15 Mar 2012 06:14:50 GMT

You are probably reading the values before the map actually changes extent. I suggest you listen to the map.onExtentChange event and then get the map extent values.

I'm creating a group of features common extent. Getting minx, miny, maxx, maxy from whole group and assigning it to map extent, so it zooms in/out on the whole group. And the group extent comes out just fine. The problem is the map.setExtent sets extent to different envelope

Re: map.setExtent not setting right values

MatejSkerjanc — Thu, 15 Mar 2012 06:22:11 GMT

Found sollution which was pretty obvious

var xtent = new esri.geometry.Extent({
        "xmin":xmin,
        "ymin":ymin,
        "xmax":xmax,
        "ymax":ymax, "spatialReference": { "wkid":map.spatialReference.wkid }
});

map.setExtent(xtent, true); //When true, for maps that contain tiled map service layers, you are guaranteed to have the input extent shown completely on the map. (As of v1.3)
I did test this but before when my SR was wrong and it "crashed with error". Previously i had SR set to   "spatialReference": { "wkid":map.spatialReference } and it's wrong it seems.

Thank you guys