CSVLayer
In deze oefening gaan we puntobjecten uit een CSV bestand als laag aan onze web map toevoegen. Hiervoor gebruiken we een klein bestandje met informatie over vliegvelden in Nederland (zie hieronder).
In dit voorbeeld wordt ook getoond hoe een CSVLayer
geherprojecteerd wordt naar een ander ruimtelijk referentiesysteem. De coördinaten in het invoerbestand zijn in WGS84, terwijl onze basiskaart (zie deze oefening) in het Nederlandse projectiesysteem (RD_New) is. Maar let op: voor deze herprojectie hoef je niets extra te doen, omdat dit automatisch intern wordt afgehandeld door de projection engine aan de kant van de client.
Het gebruikte CSV bestand (NL_Vliegvelden.csv) staat hier en de inhoud wordt hieronder getoond:
| Vliegveld | IATA | Noorderbreedte | Oosterlengte |
| Amsterdam Airport Schiphol | AMS | 52.308333 | 4.760833 |
| Rotterdam The Hague Airport | RTM | 51.95 | 4.433333 |
| Groningen Airport Eelde | GRQ | 53.125 | 6.583333 |
| Eindhoven Airport | EIN | 51.450278 | 5.374444 |
| Maastricht Aachen Airport | MST | 50.915833 | 5.776944 |
Als symbool voor onze luchthavens gebruiken we deze afbeelding:
Let op: om toegang te krijgen tot zowel het CSV bestand als de PNG afbeelding, moet je er voor zorgen dat deze files op hetzelfde domein staan als de website (of ze moeten op een server staan die CORS ondersteund of er moet een proxy ingericht worden...)
De broncode staat hieronder. Klik hier om de applicatie in actie te zien.
<SPAN class="doctype token"><!DOCTYPE html></SPAN>
<SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"><</SPAN>html</SPAN><SPAN class="punctuation token">></SPAN></SPAN>
<SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"><</SPAN>head</SPAN><SPAN class="punctuation token">></SPAN></SPAN>
<SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"><</SPAN>meta</SPAN> <SPAN class="attr-name token">charset</SPAN><SPAN class="attr-value token"><SPAN class="punctuation token">=</SPAN><SPAN class="punctuation token">"</SPAN>utf-8<SPAN class="punctuation token">"</SPAN></SPAN><SPAN class="punctuation token">></SPAN></SPAN>
<SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"><</SPAN>meta</SPAN> <SPAN class="attr-name token">name</SPAN><SPAN class="attr-value token"><SPAN class="punctuation token">=</SPAN><SPAN class="punctuation token">"</SPAN>viewport<SPAN class="punctuation token">"</SPAN></SPAN> <SPAN class="attr-name token">content</SPAN><SPAN class="attr-value token"><SPAN class="punctuation token">=</SPAN><SPAN class="punctuation token">"</SPAN>initial-scale<SPAN class="punctuation token">=</SPAN>1, maximum-scale<SPAN class="punctuation token">=</SPAN>1, user-scalable<SPAN class="punctuation token">=</SPAN>no<SPAN class="punctuation token">"</SPAN></SPAN><SPAN class="punctuation token">></SPAN></SPAN>
<SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"><</SPAN>title</SPAN><SPAN class="punctuation token">></SPAN></SPAN>Aan de slag met ArcGIS JavaScript - CSV bestand toevoegen<SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"></</SPAN>title</SPAN><SPAN class="punctuation token">></SPAN></SPAN>
<SPAN class="language-css style token"><SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"><</SPAN>style</SPAN><SPAN class="punctuation token">></SPAN></SPAN>
<SPAN class="selector token">html, body, #viewDiv</SPAN> <SPAN class="punctuation token">{</SPAN>
<SPAN class="property token">padding</SPAN><SPAN class="punctuation token">:</SPAN> 0<SPAN class="punctuation token">;</SPAN>
<SPAN class="property token">margin</SPAN><SPAN class="punctuation token">:</SPAN> 0<SPAN class="punctuation token">;</SPAN>
<SPAN class="property token">height</SPAN><SPAN class="punctuation token">:</SPAN> 100%<SPAN class="punctuation token">;</SPAN>
<SPAN class="property token">width</SPAN><SPAN class="punctuation token">:</SPAN> 100%<SPAN class="punctuation token">;</SPAN>
<SPAN class="punctuation token">}</SPAN>
<SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"></</SPAN>style</SPAN><SPAN class="punctuation token">></SPAN></SPAN></SPAN>
<SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"><</SPAN>link</SPAN> <SPAN class="attr-name token">rel</SPAN><SPAN class="attr-value token"><SPAN class="punctuation token">=</SPAN><SPAN class="punctuation token">"</SPAN>stylesheet<SPAN class="punctuation token">"</SPAN></SPAN> <SPAN class="attr-name token">href</SPAN><SPAN class="attr-value token"><SPAN class="punctuation token">=</SPAN><SPAN class="punctuation token">"</SPAN>https://js.arcgis.com/4.11/esri/css/main.css<SPAN class="punctuation token">"</SPAN></SPAN><SPAN class="punctuation token">></SPAN></SPAN>
<SPAN class="language-javascript script token"><SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"><</SPAN>script</SPAN> <SPAN class="attr-name token">src</SPAN><SPAN class="attr-value token"><SPAN class="punctuation token">=</SPAN><SPAN class="punctuation token">"</SPAN>https://js.arcgis.com/4.11/<SPAN class="punctuation token">"</SPAN></SPAN><SPAN class="punctuation token">></SPAN></SPAN><SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"></</SPAN>script</SPAN><SPAN class="punctuation token">></SPAN></SPAN></SPAN>
<SPAN class="language-javascript script token"><SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"><</SPAN>script</SPAN><SPAN class="punctuation token">></SPAN></SPAN>
<SPAN class="token function">require</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">[</SPAN>
<SPAN class="string token">"esri/Map"</SPAN><SPAN class="punctuation token">,</SPAN>
<SPAN class="string token">"esri/geometry/Point"</SPAN><SPAN class="punctuation token">,</SPAN>
<SPAN class="string token">"esri/views/MapView"</SPAN><SPAN class="punctuation token">,</SPAN>
<SPAN class="string token">"esri/layers/CSVLayer"</SPAN><SPAN class="punctuation token">,</SPAN>
<SPAN class="string token">"esri/widgets/LayerList"</SPAN>
<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> Point<SPAN class="punctuation token">,</SPAN> MapView<SPAN class="punctuation token">,</SPAN> CSVLayer<SPAN class="punctuation token">,</SPAN> LayerList<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
<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>
basemap<SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">{</SPAN>
portalItem<SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">{</SPAN>
id<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"7aea6fa913a94176a1074edb40690318"</SPAN> <SPAN class="comment token">// Topo RD</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="keyword token">var</SPAN> rdOrigin <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Point</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">{</SPAN>
x<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">155000</SPAN><SPAN class="punctuation token">,</SPAN>
y<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">463000</SPAN><SPAN class="punctuation token">,</SPAN>
spatialReference<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">28992</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<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>
spatialReference<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">28992</SPAN><SPAN class="punctuation token">,</SPAN>
container<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"viewDiv"</SPAN><SPAN class="punctuation token">,</SPAN>
map<SPAN class="punctuation token">:</SPAN> map<SPAN class="punctuation token">,</SPAN>
center<SPAN class="punctuation token">:</SPAN> rdOrigin<SPAN class="punctuation token">,</SPAN>
zoom<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">3</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> symbol <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">{</SPAN>
type<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"picture-marker"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="comment token">// autocasts as new PictureMarkerSymbol()</SPAN>
url<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"airplane.png"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="comment token">// To avoid CORS issues with this symbol, do one of the following: 1) Make certain that the image is hosted on a CORS enabled server;</SPAN>
<SPAN class="comment token">// 2) Use an image hosted on the same domain as the application; 3) Install a proxy.</SPAN>
width<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"54px"</SPAN><SPAN class="punctuation token">,</SPAN>
height<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"54px"</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> renderer <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">{</SPAN>
type<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"simple"</SPAN><SPAN class="punctuation token">,</SPAN>
symbol<SPAN class="punctuation token">:</SPAN> symbol
<SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> popupTemplate <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">{</SPAN> <SPAN class="comment token">// autocasts as new PopupTemplate()</SPAN>
title<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"{Vliegveld}"</SPAN><SPAN class="punctuation token">,</SPAN>
content<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"{*}"</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> csvLayer <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">CSVLayer</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">{</SPAN>
url<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"NL_Vliegvelden.csv"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="comment token">// If CSV files are not on the same domain as your website, a CORS enabled server or a proxy is required.</SPAN>
title<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"Vliegvelden in Nederland"</SPAN><SPAN class="punctuation token">,</SPAN>
longitudeField<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"Oosterlengte"</SPAN><SPAN class="punctuation token">,</SPAN>
latitudeField<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"Noorderbreedte"</SPAN><SPAN class="punctuation token">,</SPAN>
renderer<SPAN class="punctuation token">:</SPAN> renderer<SPAN class="punctuation token">,</SPAN>
popupTemplate<SPAN class="punctuation token">:</SPAN> popupTemplate
<SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
map<SPAN class="punctuation token">.</SPAN><SPAN class="token function">add</SPAN><SPAN class="punctuation token">(</SPAN>csvLayer<SPAN class="punctuation token">)</SPAN>
<SPAN class="keyword token">var</SPAN> layerList <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">LayerList</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">{</SPAN>
view<SPAN class="punctuation token">:</SPAN> view<SPAN class="punctuation token">,</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
view<SPAN class="punctuation token">.</SPAN>ui<SPAN class="punctuation token">.</SPAN><SPAN class="token function">add</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">[</SPAN>layerList<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"top-right"</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="token tag"><SPAN class="token tag"><SPAN class="punctuation token"></</SPAN>script</SPAN><SPAN class="punctuation token">></SPAN></SPAN></SPAN>
<SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"></</SPAN>head</SPAN><SPAN class="punctuation token">></SPAN></SPAN>
<SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"><</SPAN>body</SPAN><SPAN class="punctuation token">></SPAN></SPAN>
<SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"><</SPAN>div</SPAN> <SPAN class="attr-name token">id</SPAN><SPAN class="attr-value token"><SPAN class="punctuation token">=</SPAN><SPAN class="punctuation token">"</SPAN>viewDiv<SPAN class="punctuation token">"</SPAN></SPAN><SPAN class="punctuation token">></SPAN></SPAN><SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"></</SPAN>div</SPAN><SPAN class="punctuation token">></SPAN></SPAN>
<SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"></</SPAN>body</SPAN><SPAN class="punctuation token">></SPAN></SPAN>
<SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"></</SPAN>html</SPAN><SPAN class="punctuation token">></SPAN></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></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>
