topic How to set the map scale ratio in arcgis server by javascript? in ArcGIS JavaScript Maps SDK Questions

How to set the map scale ratio in arcgis server by javascript?

MdAziz — Mon, 05 Sep 2011 07:28:35 GMT

Hi everyone

Really I need to know the code for " How to set the map scale ratio in arcgis server by javascript?" I became crazy for this :mad: I know how to set the map extent or zoom to specific feature. But not sure how to set the scale ratio, how much should i plus/minus the extent. For example what I need to show I have attached a demo file. Like before hope this time also some one will come out to help me.

Thanks in advance. 🙂

Re: How to set the map scale ratio in arcgis server by javascript?

AxelSchaefer — Sat, 11 Dec 2021 07:13:31 GMT

Have you tried this:

function zoomToScale(scale){
    map.setExtent(esri.geometry.getExtentForScale(map, scale));
}

regards,
a.

Re: How to set the map scale ratio in arcgis server by javascript?

MdAziz — Sat, 11 Dec 2021 07:13:33 GMT

Thanks a lot Axxl, ur key word really helps me to get the solution.

 
  var currentScale = esri.geometry.getScale(map.extent,map.width,map.spatialReference.wkid); 
  var scaleRatio = userScale / currentScale;
   var newExtent = map.extent.expand(scaleRatio);
   map.setExtent(newExtent);