I am studying the following ESRI "Select with Feature layer" sample codes:
ArcGIS API for JavaScript Sandbox
After that query is finished, I would like to create a FeatureTable and let all the query pink points within the 1 mile buffer go to the FeatureTable. Currently all the records go to the Feature Table, but I just need want to display data in table for the points inside the buffer. Below is my codes. Thanks a lot!
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
<title>Select with feature layer</title>
<link rel="stylesheet" href="https://js.arcgis.com/3.17/dijit/themes/tundra/tundra.css">
<link rel="stylesheet" href="https://js.arcgis.com/3.17/esri/css/esri.css">
<style>
html, body, #mapDiv {
padding: 0;
margin: 0;
height: 100%;
}
#messages{
background-color: #fff;
box-shadow: 0 0 5px #888;
font-size: 1.1em;
max-width: 15em;
padding: 0.5em;
position: absolute;
right: 20px;
top: 20px;
z-index: 40;
}
</style>
<script src="https://js.arcgis.com/3.17/"></script>
<script>
var map;
require([
"esri/map", "esri/layers/FeatureLayer", "esri/dijit/FeatureTable",
"esri/tasks/query", "esri/geometry/Circle",
"esri/graphic", "esri/InfoTemplate", "esri/symbols/SimpleMarkerSymbol",
"esri/symbols/SimpleLineSymbol", "esri/symbols/SimpleFillSymbol", "esri/renderers/SimpleRenderer",
"esri/config", "esri/Color", "dojo/dom", "dojo/domReady!"
], function(
Map, FeatureLayer,FeatureTable,
Query, Circle,
Graphic, InfoTemplate, SimpleMarkerSymbol,
SimpleLineSymbol, SimpleFillSymbol, SimpleRenderer,
esriConfig, Color, dom
) {
// use a proxy page if a URL generated by this page is greater than 2000 characters
//
// this should not be needed as nearly all query & select functions are performed on the client
esriConfig.defaults.io.proxyUrl = "/proxy/";
map = new Map("mapDiv", {
basemap: "streets",
center: [-95.249, 38.954],
zoom: 14,
slider: false
});
//add the census block points in on demand mode. Note that an info template has been defined so when
//selected features are clicked a popup window will appear displaying the content defined in the info template.
var featureLayer = new FeatureLayer("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/0",{
//infoTemplate: new InfoTemplate("Block: ${BLOCK}", "${*}"),
outFields: ["*"]
});
// selection symbol used to draw the selected census block points within the buffer polygon
var symbol = new SimpleMarkerSymbol(
SimpleMarkerSymbol.STYLE_CIRCLE,
12,
new SimpleLineSymbol(
SimpleLineSymbol.STYLE_NULL,
new Color([247, 34, 101, 0.9]),
1
),
new Color([207, 34, 171, 0.5])
);
featureLayer.setSelectionSymbol(symbol);
//make unselected features invisible
var nullSymbol = new SimpleMarkerSymbol().setSize(0);
featureLayer.setRenderer(new SimpleRenderer(nullSymbol));
map.addLayer(featureLayer);
var circleSymb = new SimpleFillSymbol(
SimpleFillSymbol.STYLE_NULL,
new SimpleLineSymbol(
SimpleLineSymbol.STYLE_SHORTDASHDOTDOT,
new Color([105, 105, 105]),
2
), new Color([255, 255, 0, 0.25])
);
var circle;
//when the map is clicked create a buffer around the click point of the specified distance.
map.on("click", function(evt){
circle = new Circle({
center: evt.mapPoint,
geodesic: true,
radius: 1,
radiusUnit: "esriMiles"
});
map.graphics.clear();
map.infoWindow.hide();
var graphic = new Graphic(circle, circleSymb);
map.graphics.add(graphic);
var query = new Query();
query.geometry = circle.getExtent();
//use a fast bounding box query. will only go to the server if bounding box is outside of the visible map
featureLayer.queryFeatures(query, selectInBuffer);
});
function selectInBuffer(response){
var feature;
var features = response.features;
var inBuffer = [];
//filter out features that are not actually in buffer, since we got all points in the buffer's bounding box
for (var i = 0; i < features.length; i++) {
feature = features;
if(circle.contains(feature.geometry)){
inBuffer.push(feature.attributes[featureLayer.objectIdField]);
}
}
var query = new Query();
query.objectIds = inBuffer;
myFeatureTable.selectedRowIds = query.objectIds; // here is what I added
myFeatureTable._showSelectedRecords(); //
//use a fast objectIds selection query (should not need to go to the server)
featureLayer.selectFeatures(query, FeatureLayer.SELECTION_NEW, function(results){
var totalPopulation = sumPopulation(results);
var r = "";
r = "<b>The total Census Block population within the buffer is <i>" + totalPopulation + "</i>.</b>";
dom.byId("messages").innerHTML = r;
});
}
function sumPopulation(features) {
var popTotal = 0;
for (var x = 0; x < features.length; x++) {
popTotal = popTotal + features.attributes["POP2000"];
}
return popTotal;
}
myFeatureTable = new FeatureTable({
"featureLayer" : featureLayer,
"outFields": [
"POP2000"
],
fieldInfos: [
{
name: 'POP2000',
alias: 'POP2000',
},
{
name: 'HOUSEHOLDS',
alias: 'Household Name',
}
],
"map" : map
}, 'myTableNode');
myFeatureTable.startup();
});
</script>
</head>
<body>
<span id="messages">Click on the map to select census block points within 1 mile.</span>
<div id="mapDiv"></div>
<div id="myTableNode"></div>
</body>
</html>
