Hey i am working on a feature layer and i would like to have the all the tuple values of a single column of my feature layer so that i will use these tuples to insert in a drop down list for my web app. I hope for a quick reply.
Jayendra,
Getting values from a single column is a fairly simple task with a QueryTask in the JS API.
The returned value of a QueryTask is a FeatureSet (which is an Array of Graphics) a tuple is something in Python and other languages though, not JavaScript.
<SPAN class="token function">require</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">[</SPAN> <SPAN class="string token">"esri/tasks/query"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"esri/tasks/QueryTask"</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="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN>Query<SPAN class="punctuation token">,</SPAN> QueryTask<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="keyword token">var</SPAN> query <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Query</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="keyword token">var</SPAN> queryTask <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">QueryTask</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> query<SPAN class="punctuation token">.</SPAN>where <SPAN class="operator token">=</SPAN> <SPAN class="string token">"STATE_NAME = 'Washington'"</SPAN><SPAN class="punctuation token">;</SPAN> query<SPAN class="punctuation token">.</SPAN>outSpatialReference <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">{</SPAN>wkid<SPAN class="punctuation token">:</SPAN><SPAN class="number token">102100</SPAN><SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">;</SPAN> query<SPAN class="punctuation token">.</SPAN>returnGeometry <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">true</SPAN><SPAN class="punctuation token">;</SPAN> query<SPAN class="punctuation token">.</SPAN>outFields <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="string token">"CITY_NAME"</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">;</SPAN> queryTask<SPAN class="punctuation token">.</SPAN><SPAN class="token function">execute</SPAN><SPAN class="punctuation token">(</SPAN>query<SPAN class="punctuation token">,</SPAN> addPointsToMap<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="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>
This will return the CITY_NAME filed from the Map Service that has a STATE_NAME of Washington.
So that what i would like perform query for retrieving the single column
data and i will generate a drop down list of that data
What actually im looking is a line that seems to be SELECT
NAME_OF_THE_SCHOOL from TABLENAME as in sql which gives all the records in
that column
On Mon, Dec 3, 2018 at 11:59 AM Chorapalli Jayendra praveen kumar <
Sir,
My application is real time sir the values of my column keeps on increasing
if schools get registered .
so i cant directly give the json url in my code because it only has the
school data at that point of time . if any new school gets registered in my
website i cant find them in the drop down list.
can u please provide me a solution for this.
On Mon, Dec 3, 2018 at 10:43 AM Robert Scheitlin, GISP <geonet@esri.com>
OK, So here is a full sample for adding a fields unique values to a dropdown.
<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 http<SPAN class="operator token">-</SPAN>equiv<SPAN class="operator token">=</SPAN><SPAN class="string token">"Content-Type"</SPAN> content<SPAN class="operator token">=</SPAN><SPAN class="string token">"text/html; charset=utf-8"</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">"initial-scale=1, maximum-scale=1,user-scalable=no"</SPAN> <SPAN class="operator token">/</SPAN><SPAN class="operator token">></SPAN> <SPAN class="operator token"><</SPAN>title<SPAN class="operator token">></SPAN>Drop Down Test<SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>title<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"><SPAN>"</SPAN><A class="jive-link-external-small" href="https://community.esri.com/external-link.jspa?url=http%3A%2F%2Fjs.arcgis.com%2F4.9%2Fdijit%2Fthemes%2Fclaro%2Fclaro.css" target="_blank">http://js.arcgis.com/4.9/dijit/themes/claro/claro.css</A><SPAN>"</SPAN></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"><SPAN>"</SPAN><A class="jive-link-external-small" href="https://community.esri.com/external-link.jspa?url=https%3A%2F%2Fjs.arcgis.com%2F4.9%2Fesri%2Fcss%2Fmain.css" target="_blank">https://js.arcgis.com/4.9/esri/css/main.css</A><SPAN>"</SPAN></SPAN><SPAN class="operator token">></SPAN> <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%2F4.9%2F" target="_blank">https://js.arcgis.com/4.9/</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> <SPAN class="operator token"><</SPAN>style<SPAN class="operator token">></SPAN> html<SPAN class="punctuation token">,</SPAN> body<SPAN class="punctuation token">,</SPAN> #mainWindow <SPAN class="punctuation token">{</SPAN> height<SPAN class="punctuation token">:</SPAN> <SPAN 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class="string token">"dojo/on"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"esri/tasks/support/Query"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"esri/layers/FeatureLayer"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"dojo/store/Memory"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"dojo/_base/array"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"dojo/_base/lang"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"esri/request"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"dojo/parser"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"dijit/registry"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"dijit/layout/BorderContainer"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"dijit/layout/ContentPane"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"dijit/form/Button"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"dijit/form/ComboBox"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"dojo/domReady!"</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> MapView<SPAN class="punctuation token">,</SPAN> on<SPAN class="punctuation token">,</SPAN> Query<SPAN class="punctuation token">,</SPAN> FeatureLayer<SPAN class="punctuation token">,</SPAN> Memory<SPAN class="punctuation token">,</SPAN> array<SPAN class="punctuation token">,</SPAN> lang<SPAN class="punctuation token">,</SPAN> esriRequest<SPAN class="punctuation token">,</SPAN> parser<SPAN class="punctuation token">,</SPAN> registry <SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN> parser<SPAN class="punctuation token">.</SPAN><SPAN class="token function">parse</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</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="string token">"topo"</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> container<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"map"</SPAN><SPAN class="punctuation 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href="https://community.esri.com/external-link.jspa?url=http%3A%2F%2Fsampleserver6.arcgisonline.com%2Farcgis%2Frest%2Fservices%2FCensus%2FMapServer%2F3%2Fquery%3Fwhere%3D1%253D1%26outFields%3DSTATE_NAME%26returnGeometry%3Dfalse%26orderByFields%3DSTATE_NAME%26returnDistinctValues%3Dtrue%26f%3Djson" target="_blank">http://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/3/query?where=1%3D1&outFields=STATE_NAME&returnGeometry=false&orderByFields=STATE_NAME&returnDistinctValues=true&f=json</A><SPAN>'</SPAN></SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">{</SPAN> responseType<SPAN class="punctuation token">:</SPAN><SPAN class="string token">'json'</SPAN><SPAN class="punctuation token">,</SPAN> timeout<SPAN class="punctuation token">:</SPAN><SPAN class="number token">15000</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>lang<SPAN class="punctuation token">.</SPAN><SPAN class="token function">hitch</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">,</SPAN><SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN>response<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">{</SPAN> <SPAN class="keyword token">var</SPAN> store2 <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Memory</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">{</SPAN>data<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> registry<SPAN class="punctuation token">.</SPAN><SPAN class="token function">byId</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"stateSelect"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="keyword token">set</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">'store'</SPAN><SPAN class="punctuation token">,</SPAN>store2<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="keyword token">var</SPAN> data <SPAN class="operator token">=</SPAN> array<SPAN class="punctuation token">.</SPAN><SPAN class="token function">map</SPAN><SPAN class="punctuation token">(</SPAN>response<SPAN class="punctuation token">.</SPAN>data<SPAN class="punctuation token">.</SPAN>features<SPAN class="punctuation token">,</SPAN>lang<SPAN class="punctuation token">.</SPAN><SPAN class="token function">hitch</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">this</SPAN><SPAN class="punctuation token">,</SPAN><SPAN class="keyword token">function</SPAN><SPAN class="punctuation token">(</SPAN>feat<SPAN class="punctuation token">,</SPAN> index<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">{</SPAN> <SPAN class="keyword token">var</SPAN> name <SPAN class="operator token">=</SPAN> feat<SPAN class="punctuation token">.</SPAN>attributes<SPAN class="punctuation token">.</SPAN>STATE_NAME<SPAN class="punctuation token">;</SPAN> <SPAN class="keyword token">var</SPAN> value <SPAN class="operator token">=</SPAN> feat<SPAN class="punctuation token">.</SPAN>attributes<SPAN class="punctuation token">.</SPAN>STATE_NAME<SPAN class="punctuation token">;</SPAN> <SPAN class="keyword token">var</SPAN> dataItem <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">{</SPAN> id<SPAN class="punctuation token">:</SPAN>index<SPAN class="punctuation token">,</SPAN> name<SPAN class="punctuation token">:</SPAN>name<SPAN class="punctuation token">,</SPAN> value<SPAN class="punctuation token">:</SPAN>value <SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">;</SPAN> <SPAN class="keyword token">return</SPAN> dataItem<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> store2 <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">Memory</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">{</SPAN>data<SPAN class="punctuation token">:</SPAN>data<SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN> registry<SPAN class="punctuation token">.</SPAN><SPAN class="token function">byId</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"stateSelect"</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="keyword token">set</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">'store'</SPAN><SPAN class="punctuation token">,</SPAN>store2<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 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="keyword token">class</SPAN><SPAN class="operator token">=</SPAN><SPAN class="string token">"claro"</SPAN><SPAN class="operator token">></SPAN> <SPAN class="operator token"><</SPAN>div id<SPAN class="operator token">=</SPAN><SPAN class="string token">"mainWindow"</SPAN> data<SPAN class="operator token">-</SPAN>dojo<SPAN class="operator token">-</SPAN>type<SPAN class="operator token">=</SPAN><SPAN class="string token">"dijit/layout/BorderContainer"</SPAN> data<SPAN class="operator token">-</SPAN>dojo<SPAN class="operator token">-</SPAN>props<SPAN class="operator token">=</SPAN><SPAN class="string token">"design:'headline', gutters:false"</SPAN> style<SPAN class="operator token">=</SPAN><SPAN class="string token">"padding:0px;margin:0px;"</SPAN><SPAN class="operator token">></SPAN> <SPAN class="operator token"><</SPAN>div id<SPAN class="operator token">=</SPAN><SPAN class="string token">"header"</SPAN> data<SPAN class="operator token">-</SPAN>dojo<SPAN class="operator token">-</SPAN>type<SPAN class="operator token">=</SPAN><SPAN class="string token">"dijit/layout/ContentPane"</SPAN> data<SPAN class="operator token">-</SPAN>dojo<SPAN class="operator token">-</SPAN>props<SPAN class="operator token">=</SPAN><SPAN class="string token">"region:'top'"</SPAN> style<SPAN class="operator token">=</SPAN><SPAN class="string token">"overflow:hidden;border:none;border-bottom: 3px solid #CC9900;font-family: Windows;font-size:14pt; color: #FFFFFF;background: #000000; "</SPAN><SPAN class="operator token">></SPAN> Select a State<SPAN class="punctuation token">:</SPAN> <SPAN class="operator token"><</SPAN>input id<SPAN class="operator token">=</SPAN><SPAN class="string token">"stateSelect"</SPAN> data<SPAN class="operator token">-</SPAN>dojo<SPAN class="operator token">-</SPAN>type<SPAN class="operator token">=</SPAN><SPAN class="string token">"dijit/form/ComboBox"</SPAN> value<SPAN class="operator token">=</SPAN><SPAN class="string token">"Select State"</SPAN> data<SPAN class="operator token">-</SPAN>dojo<SPAN class="operator token">-</SPAN>props<SPAN class="operator token">=</SPAN><SPAN class="string token">"maxHeight: 200"</SPAN> <SPAN class="operator token">/</SPAN><SPAN class="operator token">></SPAN> <SPAN class="operator token"><</SPAN>input type<SPAN class="operator token">=</SPAN><SPAN class="string token">"hidden"</SPAN> name<SPAN class="operator token">=</SPAN><SPAN class="string token">"stateabbr"</SPAN> id<SPAN class="operator token">=</SPAN><SPAN class="string token">"stateabbr"</SPAN> <SPAN class="operator token">/</SPAN><SPAN class="operator token">></SPAN> <SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>div<SPAN class="operator token">></SPAN> <SPAN class="operator token"><</SPAN>div id<SPAN class="operator token">=</SPAN><SPAN class="string token">"map"</SPAN> data<SPAN class="operator token">-</SPAN>dojo<SPAN class="operator token">-</SPAN>type<SPAN class="operator token">=</SPAN><SPAN class="string token">"dijit/layout/ContentPane"</SPAN> data<SPAN class="operator token">-</SPAN>dojo<SPAN class="operator token">-</SPAN>props<SPAN class="operator token">=</SPAN><SPAN class="string token">"region:'left'"</SPAN> style<SPAN class="operator token">=</SPAN><SPAN class="string token">"width:100%;height:95%;border:none;padding:0px;margin:0px;"</SPAN><SPAN class="operator 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>div<SPAN class="operator token">></SPAN> <SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>body<SPAN class="operator token">></SPAN> <SPAN class="operator token"><</SPAN><SPAN class="operator token">/</SPAN>html<SPAN class="operator token">></SPAN> <SPAN 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The table of my feature layer has been attached under this.I would like
to retrieve the NAME_OF_THE_SCHOOL column data of that table and insert
each value of that column in a drop down list in my website.As far as your
concerns about selecting a particular record in a column but i would like
to retrieve the entire column data.
I hope for a quick reply sir.
On Mon, Dec 3, 2018 at 10:09 AM Robert Scheitlin, GISP <geonet@esri.com>
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