Is there a working example for
projection | API Reference | ArcGIS API for JavaScript 4.10
I pasted the example to JSFiddle
Edit fiddle - JSFiddle
I got the error_
Cannot read property '_getTransformation' of null
What do i miss?
Matthias,
You have to load the module first:
<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> <SPAN class="operator token"><</SPAN>meta charset<SPAN class="operator token">=</SPAN><SPAN class="string token">"utf-8"</SPAN><SPAN class="operator token">></SPAN> <SPAN class="operator token"><</SPAN>meta http<SPAN class="operator token">-</SPAN>equiv<SPAN class="operator token">=</SPAN><SPAN class="string token">"X-UA-Compatible"</SPAN> content<SPAN class="operator token">=</SPAN><SPAN class="string token">"IE=edge"</SPAN><SPAN class="operator token">></SPAN> <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">"width=device-width, initial-scale=1.0"</SPAN><SPAN class="operator token">></SPAN> <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">"https://js.arcgis.com/4.10/esri/css/main.css"</SPAN><SPAN class="operator token">></SPAN> <SPAN class="operator token"><</SPAN>script src<SPAN class="operator token">=</SPAN><SPAN class="string token">"https://js.arcgis.com/4.10/"</SPAN><SPAN class="operator token">></SPAN><SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>script<SPAN class="operator token">></SPAN> <SPAN class="operator token"><</SPAN>script<SPAN class="operator token">></SPAN> <SPAN class="token function">require</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">[</SPAN> <SPAN class="string token">"esri/geometry/projection"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"esri/geometry/SpatialReference"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"esri/geometry/Extent"</SPAN> <SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">function</SPAN> <SPAN class="punctuation token">(</SPAN>projection<SPAN class="punctuation token">,</SPAN>SpatialReference<SPAN class="punctuation token">,</SPAN>Extent<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN> <SPAN class="keyword token">const</SPAN> cs1 <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">SpatialReference</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">{</SPAN> wkid<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">4272</SPAN> <SPAN class="comment token">//PE_GCS_ED_1950</SPAN> <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="keyword token">const</SPAN> cs2 <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">SpatialReference</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">{</SPAN> wkid<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">4167</SPAN> <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="keyword token">const</SPAN> extent <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Extent</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">{</SPAN> xmin<SPAN class="punctuation token">:</SPAN> <SPAN class="operator token">-</SPAN><SPAN class="number token">186.0</SPAN><SPAN class="punctuation token">,</SPAN> ymin<SPAN class="punctuation token">:</SPAN> <SPAN class="operator token">-</SPAN><SPAN class="number token">42.0</SPAN><SPAN class="punctuation token">,</SPAN> xmax<SPAN class="punctuation token">:</SPAN> <SPAN class="operator token">-</SPAN><SPAN class="number token">179.0</SPAN><SPAN class="punctuation token">,</SPAN> ymax<SPAN class="punctuation token">:</SPAN> <SPAN class="operator token">-</SPAN><SPAN class="number token">38.0</SPAN> <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> projection<SPAN class="punctuation token">.</SPAN><SPAN class="token function">load</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><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>evt<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN> <SPAN class="keyword token">const</SPAN> geogtrans <SPAN class="operator token">=</SPAN> projection<SPAN class="punctuation token">.</SPAN><SPAN class="token function">getTransformations</SPAN><SPAN class="punctuation token">(</SPAN>cs1<SPAN class="punctuation token">,</SPAN> cs2<SPAN class="punctuation token">,</SPAN> extent<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> geogtrans<SPAN class="punctuation token">.</SPAN><SPAN class="token function">forEach</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN>geogtran<SPAN class="punctuation token">,</SPAN> index<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN> geogtran<SPAN class="punctuation token">.</SPAN>steps<SPAN class="punctuation token">.</SPAN><SPAN class="token function">forEach</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN>step<SPAN class="punctuation token">,</SPAN> index<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN> console<SPAN class="punctuation token">.</SPAN><SPAN class="token function">log</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"step wkid: "</SPAN><SPAN class="punctuation token">,</SPAN> step<SPAN class="punctuation token">.</SPAN>wkid<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>script<SPAN class="operator 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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>
Actually the load requirement is stated in the help documentation:
https://developers.arcgis.com/javascript/latest/api-reference/esri-geometry-projection.html#load
Loads this module's dependencies. This method must be called before projecting geometries.
I agree that it should be part of the code snippets though.
Heather Gonzago
Thank you Robert. Now it works!
The documentation at the esri page is wrong!
...Maybe they should fix that. Wrong documentation is just frustrating ...
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