How to display loading icon when map is loading with API JavaScript 4 ?

FlavieMORAUX1

Hy,

I need to display loading icon when map is loading.

With API JavaScript 3.X it is possible with map event's onUpdateStart/onUpdateEnd, like in following sample :

Show loading icon | ArcGIS API for JavaScript 3.25 

Equivalent is not available in version 4, so how to do that ? Is there a way to do like in version 3 globally on Map (or View) ?

Regards,

Flavie

rscheitlin

Flavie,

   In 4.x you watch properties of the view like updating

<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">4.8</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;&nbsp;&nbsp; <SPAN class="punctuation token">.</SPAN>visible <SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; display<SPAN class="punctuation token">:</SPAN> block <SPAN class="operator token">!</SPAN>important<SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">.</SPAN>loading<SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; position<SPAN class="punctuation token">:</SPAN> absolute<SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; top<SPAN class="punctuation token">:</SPAN> 100px<SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; left<SPAN class="punctuation token">:</SPAN> 100px<SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; background<SPAN class="operator token">-</SPAN>color<SPAN class="punctuation token">:</SPAN> black<SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; color<SPAN class="punctuation token">:</SPAN> white<SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; display<SPAN class="punctuation token">:</SPAN> none<SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; padding<SPAN class="punctuation token">:</SPAN> 8px<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>

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&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/dom-class"</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> domClass<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; view<SPAN class="punctuation token">.</SPAN><SPAN class="token function">watch</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">'updating'</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>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN><SPAN class="punctuation token">(</SPAN>evt <SPAN class="operator token">===</SPAN> <SPAN class="keyword token">true</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; domClass<SPAN class="punctuation token">.</SPAN><SPAN class="token function">add</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">'loadingDiv'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'visible'</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="punctuation token">}</SPAN><SPAN class="keyword token">else</SPAN><SPAN class="punctuation token">{</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; domClass<SPAN class="punctuation token">.</SPAN><SPAN class="token function">remove</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">'loadingDiv'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'visible'</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <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="operator token"><</SPAN>body<SPAN class="operator token">></SPAN>
&nbsp; <SPAN class="operator token"><</SPAN>div id<SPAN class="operator token">=</SPAN><SPAN class="string token">"viewDiv"</SPAN><SPAN class="operator token">></SPAN><SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>div<SPAN class="operator token">></SPAN>
&nbsp; <SPAN class="operator token"><</SPAN>div id<SPAN class="operator token">=</SPAN><SPAN class="string token">"loadingDiv"</SPAN> <SPAN class="keyword token">class</SPAN><SPAN class="operator token">=</SPAN><SPAN class="string token">"loading"</SPAN><SPAN class="operator token">></SPAN>Updating<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>div<SPAN class="operator token">></SPAN>
<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>body<SPAN class="operator token">></SPAN>
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