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Custom map center

Question asked by endlessdsire on Mar 2, 2018
Latest reply on Mar 13, 2018 by htudosieesri-ca-esridist

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Hello.

I want to know if there is a way to move the center of the map when querying a little bit.

Iam querying some feature (just 1 result) and im doing this for showing it in the center of the map.

map.centerAndZoom(featureSet.features[0].geometry.getExtent().getCenter(),20);

In my app when i do this i have a problem on visualization, thats why i want to move it to the right a little bit.

This is what i obtain: (See the blue line on the screen)

The red container is over the map, thats why when i do the center i got that.

this is what i want to get:

Thanks in advice

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rscheitlin Mar 2, 2018 6:08 AM
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Evelyn,

Have you considered extent offset?
https://developers.arcgis.com/javascript/3/jsapi/extent-amd.html#offset
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- endlessdsire @ rscheitlin on Mar 2, 2018 6:13 AM
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  Oh no, is there any example on how to apply that?. I should do it into the map or how?
  Thanks in advice
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  - rscheitlin @ endlessdsire on Mar 2, 2018 6:25 AM
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    Evelyn,
    
    So thing like this after your query is done and you get the extent you want to zoom to.
    //your get the extent of your feature to zoom to and before //you set the maps extent ofsset it by a certain Y map.setExtent(extent.offset(200,0), true);
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endlessdsire Mar 2, 2018 7:14 AM
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This work for me, thanks!
```
map.centerAndZoom(featureSet.features[0].geometry.getExtent().getCenter(),20);
map.setExtent(featureSet.features[0].geometry.getExtent().offset(-10,0), true);
```
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- rscheitlin @ endlessdsire on Mar 2, 2018 7:19 AM
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  Great, Don't forget to mark this question as answered by clicking on the "Mark Correct" link on the reply that answered your question.
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- htudosieesri-ca-esridist @ endlessdsire on Mar 2, 2018 11:29 AM
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  I wonder if you cannot do it in just one step:
  map.centerAndZoom(featureSet.features[0].geometry.getExtent().offset(10,0).getCenter(),20);
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endlessdsire Mar 12, 2018 10:38 AM
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Hello again.
Im having an issue with this
```
map.centerAndZoom(featureSet.features[0].geometry.getExtent().offset(10,0).getCenter(),20);
```
The error says Cannot read property 'offset' of null.

Im doing a query to a layer and i got the geometry and attributes correctly.
So still i cannot move the extent to the position i want.
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- htudosieesri-ca-esridist @ endlessdsire on Mar 13, 2018 2:46 AM
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  I do not have an environment at this moment to check the error.
  Beside may be the fault of a corrupted layer.
  
  I would put a breakpoint on that line to check if getExtent really returns something.
  Sometimes, the layer may be corrupted and one or more features may have no geometry!
  The error may come from those incomplete features without geometry.
  
  Another ways to go around would be to extract the geometry and check it for null.
  Then getExtent should return something, but you may check it again for null.
  If you got a null for the two above checks, log the feature.
  
  Or put in in a try/catch block and log the error along with the feature Id (or just the feature.)
  
  This (either) way, you may find if that was the case (some features do not have geometries, although they should!
  If so, keep (or add) the try/catch block with or without the log.
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  - endlessdsire @ htudosieesri-ca-esridist on Mar 13, 2018 5:24 AM
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    There is a geometry, but the function doesnt
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    - rscheitlin @ endlessdsire on Mar 13, 2018 8:03 AM
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      Evelyn,
      
      featureSet.features[0].geometry
      Is a line or a polygon right? If it is a point then a point does not have an extent.
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      - endlessdsire @ rscheitlin on Mar 13, 2018 8:05 AM
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        A point, thats why.
        
        So how should i do the offset with a point?
        
        Thanks in advice
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        rscheitlin @ endlessdsire on Mar 13, 2018 8:17 AM
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        Evelyn,
        
        The Point Class in the JS API has an offset method as well.
        https://developers.arcgis.com/javascript/3/jsapi/point-amd.html#offset
        
        So your code would look like this instead:
        map.centerAndZoom(featureSet.features[0].geometry.offset(10,0), 20);
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        htudosieesri-ca-esridist @ endlessdsire on Mar 13, 2018 10:26 AM
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        Check the geometry type for the feature.
        When is Point, get the current extent of the map and offset that instead!
        (I think you should considering that for whatever geometry, but is up to you to consider it.)
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