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Description
This JavaScript sample shows how to use the draw toolbar to select gas fields from a feature layer. The gas fields are displayed using a feature layer with ONDEMAND mode. On-demand mode retrieves selected features and features within the current extent.Click the select fields button then draw a rectangle on the map.The toolbar's onDrawEnd event fires when you finish sketching the selection rectangle. Notice that the sketch is used with the FeatureLayer's selectFeatures method to perform a spatial query.
dojo.connect(selectionToolbar, "onDrawEnd", function(geometry) {
selectionToolbar.deactivate();
selectQuery.geometry = geometry;
featureLayer.selectFeatures(selectQuery, esri.layers.FeatureLayer.SELECTION_NEW);
});
selectionToolbar.deactivate();
selectQuery.geometry = geometry;
featureLayer.selectFeatures(selectQuery, esri.layers.FeatureLayer.SELECTION_NEW);
});
After the features are selected onSelectionComplete fires and the total gas production for the selected fields is calculated.
Code
<!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>Layer in a map service - [ON-DEMAND]</title>
<link rel="stylesheet" href="https://js.arcgis.com/3.26/dijit/themes/claro/claro.css">
<link rel="stylesheet" href="https://js.arcgis.com/3.26/esri/css/esri.css" />
<script src="https://js.arcgis.com/3.26/"></script>
<script>
var map;
require([
"esri/InfoTemplate",
"esri/map",
"esri/layers/FeatureLayer",
"esri/symbols/SimpleFillSymbol",
"esri/symbols/SimpleLineSymbol",
"esri/tasks/query",
"esri/toolbars/draw",
"dojo/dom",
"dojo/on",
"dojo/parser",
"dojo/_base/array",
"esri/Color",
"dijit/form/Button",
"dojo/domReady!"
],
function (
InfoTemplate, Map, FeatureLayer, SimpleFillSymbol, SimpleLineSymbol,
Query, Draw, dom, on, parser, arrayUtil, Color
) {
parser.parse();
var selectionToolbar, featureLayer;
map = new Map("map", {
basemap: "streets",
center: [-97.395, 37.537],
zoom: 11
});
map.on("load", initSelectToolbar);
var fieldsSelectionSymbol =
new SimpleFillSymbol(SimpleFillSymbol.STYLE_SOLID,
new SimpleLineSymbol(SimpleLineSymbol.STYLE_DASHDOT,
new Color([255, 0, 0]), 2), new Color([255, 255, 0, 0.5]));
var content = "<b>Status</b>: ${STATUS}" +
"<br><b>Cumulative Gas</b>: ${CUMM_GAS} MCF" +
"<br><b>Total Acres</b>: ${APPROXACRE}" +
"<br><b>Avg. Field Depth</b>: ${AVG_DEPTH} meters";
var infoTemplate = new InfoTemplate("${FIELD_NAME}", content);
featureLayer = new FeatureLayer("https://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Petroleum/KSPetro/MapServer/1",
{
mode: FeatureLayer.MODE_ONDEMAND,
infoTemplate: infoTemplate,
outFields: ["*"]
});
featureLayer.setDefinitionExpression("PROD_GAS='Yes'");
featureLayer.setSelectionSymbol(fieldsSelectionSymbol);
featureLayer.on("selection-complete", sumGasProduction);
featureLayer.on("selection-clear", function () {
dom.byId('messages').innerHTML = "<i>No Selected Fields</i>";
});
map.addLayer(featureLayer);
on(dom.byId("selectFieldsButton"), "click", function () {
selectionToolbar.activate(Draw.EXTENT);
});
on(dom.byId("clearSelectionButton"), "click", function () {
featureLayer.clearSelection();
});
function initSelectToolbar (event) {
selectionToolbar = new Draw(event.map);
var selectQuery = new Query();
on(selectionToolbar, "DrawEnd", function (geometry) {
selectionToolbar.deactivate();
selectQuery.geometry = geometry;
featureLayer.selectFeatures(selectQuery,
FeatureLayer.SELECTION_NEW);
});
}
function sumGasProduction (event) {
var productionSum = 0;
//summarize the cumulative gas production to display
arrayUtil.forEach(event.features, function (feature) {
productionSum += feature.attributes.CUMM_GAS;
});
dom.byId('messages').innerHTML = "<b>Selected Fields Production: " +
productionSum + " mcf. </b>";
}
});
</script>
</head>
<body class="claro">
<button id="selectFieldsButton" data-dojo-type="dijit/form/Button">Select Fields</button>
<button id="clearSelectionButton" data-dojo-type="dijit/form/Button">Clear Selection</button><br>
<div id="map" style="position: relative; width:700px; height:500px; border:1px solid #000;"></div>
<span id="messages"></span>
</body>
</html>