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MapView.extent is null

EmoryHorvath

I'm creating a new webmap in version 4.5, and am setting the initial extent by using the center+zoom properties.

Works all nice and good, but then when i later try to get the extent, mapview.extent returns null.

Apparently when you use center+zoom, the extent then never gets set?

This sounds like a bug to me.

I need those extent values for some other calculations. Any idea how to get them or calculate them?

Thanks,

Emory H

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Accepted answers

rscheitlin

Emory,

I just tested and I could get the extent just fine.

Are you waiting for the view to be initialized?

<SPAN class="operator token"><</SPAN><SPAN class="operator token">!</SPAN>DOCTYPE html<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>html<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>head<SPAN class="operator token">></SPAN>
&nbsp; <SPAN class="operator token"><</SPAN>meta charset<SPAN class="operator token">=</SPAN><SPAN class="string token">"utf-8"</SPAN><SPAN class="operator token">></SPAN>
&nbsp; <SPAN class="operator token"><</SPAN>meta name<SPAN class="operator token">=</SPAN><SPAN class="string token">"viewport"</SPAN> content<SPAN class="operator token">=</SPAN><SPAN class="string token">"initial-scale=1,maximum-scale=1,user-scalable=no"</SPAN><SPAN class="operator token">></SPAN>
&nbsp; <SPAN class="operator token"><</SPAN>title<SPAN class="operator token">></SPAN>Intro to MapView <SPAN class="operator token">-</SPAN> Create a 2D map <SPAN class="operator token">-</SPAN> <SPAN class="number token">4.5</SPAN><SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>title<SPAN class="operator token">></SPAN>
&nbsp; <SPAN class="operator token"><</SPAN>style<SPAN class="operator token">></SPAN>
&nbsp;&nbsp;&nbsp; html<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; body<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; #viewDiv <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; padding<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; margin<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; height<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">100</SPAN><SPAN class="operator token">%</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; width<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">100</SPAN><SPAN class="operator token">%</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN>
&nbsp; <SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>style<SPAN class="operator token">></SPAN>

&nbsp; <SPAN class="operator token"><</SPAN>link rel<SPAN class="operator token">=</SPAN><SPAN class="string token">"stylesheet"</SPAN> href<SPAN class="operator token">=</SPAN><SPAN class="string token"><SPAN>"</SPAN><A class="jive-link-external-small" href="https://community.esri.com/external-link.jspa?url=https%3A%2F%2Fjs.arcgis.com%2F4.5%2Fesri%2Fcss%2Fmain.css" target="_blank">https://js.arcgis.com/4.5/esri/css/main.css</A><SPAN>"</SPAN></SPAN><SPAN class="operator token">></SPAN>
&nbsp; <SPAN class="operator token"><</SPAN>script src<SPAN class="operator token">=</SPAN><SPAN class="string token"><SPAN>"</SPAN><A class="jive-link-external-small" href="https://community.esri.com/external-link.jspa?url=https%3A%2F%2Fjs.arcgis.com%2F4.5%2F" target="_blank">https://js.arcgis.com/4.5/</A><SPAN>"</SPAN></SPAN><SPAN class="operator token">></SPAN><SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>script<SPAN class="operator token">></SPAN>

&nbsp; <SPAN class="operator token"><</SPAN>script<SPAN class="operator token">></SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="token function">require</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">[</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="string token">"esri/Map"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="string token">"esri/views/MapView"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="string token">"dojo/domReady!"</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN>Map<SPAN class="punctuation token">,</SPAN> MapView<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">var</SPAN> map <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Map</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; basemap<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"streets"</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">var</SPAN> view <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">MapView</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; container<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"viewDiv"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; map<SPAN class="punctuation token">:</SPAN> map<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; zoom<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">4</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; center<SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="number token">15</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">65</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="comment token">// longitude, latitude</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; view<SPAN class="punctuation token">.</SPAN><SPAN class="token function">then</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; console<SPAN class="punctuation token">.</SPAN><SPAN class="token function">info</SPAN><SPAN class="punctuation token">(</SPAN>view<SPAN class="punctuation token">.</SPAN>extent<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp; <SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>script<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>head<SPAN class="operator token">></SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

All comments

rscheitlin

lines 36 - 38 in my sample above show the proper way to do it.

Don't forget to mark your question as answered by click on the "Mark Correct" button on the reply that answered your question.

EmoryHorvath

>> Are you waiting for the view to be initialized?

Ah, sounds like a good idea... I'll try that.

Slightly Later: It worked too! Thanks!

rscheitlin

Emory,

I just tested and I could get the extent just fine.

Are you waiting for the view to be initialized?

<SPAN class="operator token"><</SPAN><SPAN class="operator token">!</SPAN>DOCTYPE html<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>html<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN>head<SPAN class="operator token">></SPAN>
&nbsp; <SPAN class="operator token"><</SPAN>meta charset<SPAN class="operator token">=</SPAN><SPAN class="string token">"utf-8"</SPAN><SPAN class="operator token">></SPAN>
&nbsp; <SPAN class="operator token"><</SPAN>meta name<SPAN class="operator token">=</SPAN><SPAN class="string token">"viewport"</SPAN> content<SPAN class="operator token">=</SPAN><SPAN class="string token">"initial-scale=1,maximum-scale=1,user-scalable=no"</SPAN><SPAN class="operator token">></SPAN>
&nbsp; <SPAN class="operator token"><</SPAN>title<SPAN class="operator token">></SPAN>Intro to MapView <SPAN class="operator token">-</SPAN> Create a 2D map <SPAN class="operator token">-</SPAN> <SPAN class="number token">4.5</SPAN><SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>title<SPAN class="operator token">></SPAN>
&nbsp; <SPAN class="operator token"><</SPAN>style<SPAN class="operator token">></SPAN>
&nbsp;&nbsp;&nbsp; html<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; body<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp; #viewDiv <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; padding<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; margin<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; height<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">100</SPAN><SPAN class="operator token">%</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; width<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">100</SPAN><SPAN class="operator token">%</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN>
&nbsp; <SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>style<SPAN class="operator token">></SPAN>

&nbsp; <SPAN class="operator token"><</SPAN>link rel<SPAN class="operator token">=</SPAN><SPAN class="string token">"stylesheet"</SPAN> href<SPAN class="operator token">=</SPAN><SPAN class="string token"><SPAN>"</SPAN><A class="jive-link-external-small" href="https://community.esri.com/external-link.jspa?url=https%3A%2F%2Fjs.arcgis.com%2F4.5%2Fesri%2Fcss%2Fmain.css" target="_blank">https://js.arcgis.com/4.5/esri/css/main.css</A><SPAN>"</SPAN></SPAN><SPAN class="operator token">></SPAN>
&nbsp; <SPAN class="operator token"><</SPAN>script src<SPAN class="operator token">=</SPAN><SPAN class="string token"><SPAN>"</SPAN><A class="jive-link-external-small" href="https://community.esri.com/external-link.jspa?url=https%3A%2F%2Fjs.arcgis.com%2F4.5%2F" target="_blank">https://js.arcgis.com/4.5/</A><SPAN>"</SPAN></SPAN><SPAN class="operator token">></SPAN><SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>script<SPAN class="operator token">></SPAN>

&nbsp; <SPAN class="operator token"><</SPAN>script<SPAN class="operator token">></SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="token function">require</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">[</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="string token">"esri/Map"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="string token">"esri/views/MapView"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="string token">"dojo/domReady!"</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN>Map<SPAN class="punctuation token">,</SPAN> MapView<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">var</SPAN> map <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Map</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; basemap<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"streets"</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">var</SPAN> view <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">MapView</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; container<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"viewDiv"</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; map<SPAN class="punctuation token">:</SPAN> map<SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; zoom<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">4</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; center<SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="number token">15</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">65</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="comment token">// longitude, latitude</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; view<SPAN class="punctuation token">.</SPAN><SPAN class="token function">then</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; console<SPAN class="punctuation token">.</SPAN><SPAN class="token function">info</SPAN><SPAN class="punctuation token">(</SPAN>view<SPAN class="punctuation token">.</SPAN>extent<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp; <SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>script<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>head<SPAN class="operator token">></SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

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