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Change attribute used for a renderer
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Description
This functionality requires an ArcGIS Server 10.1 service.
Dynamic layers provide the ability to change the renderer(s) for layers in a dynamic map service. In this sample, a drop-down list is populated with attribute field names for a layer that is displayed on the map using an ArcGIS Server 10.1 dynamic layer and a dynamic map service layer. When the selected field changes, a new map image is requested using the new field as the basis for the layer's renderer.
Code
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
<title>Change attribute used for a renderer</title>
<link rel="stylesheet" href="https://js.arcgis.com/3.26/dijit/themes/tundra/tundra.css">
<link rel="stylesheet" href="https://js.arcgis.com/3.26/esri/css/esri.css">
<style>
html, body { height: 100%; width: 100%; margin: 0; padding: 0; }
h3 { margin: 0 0 5px 0; border-bottom: 1px solid #444; text-align: center; }
.shadow {
-moz-box-shadow: 0 0 5px #888;
-webkit-box-shadow: 0 0 5px #888;
box-shadow: 0 0 5px #888;
}
#map{ margin: 0; padding: 0; }
#feedback {
background: #fff;
color: #444;
font-family: arial;
left: 30px;
margin: 5px;
padding: 10px;
position: absolute;
top: 30px;
width: 300px;
z-index: 40;
}
#note { font-size: 80%; font-weight: 700; padding: 0 0 10px 0; }
#legendDiv { padding: 10px 0 0 0; }
</style>
<script src="https://js.arcgis.com/3.26/"></script>
<script>
// one global for persistent app variables
var app = {};
require([
"esri/map",
"esri/layers/ArcGISTiledMapServiceLayer", "esri/layers/ArcGISDynamicMapServiceLayer",
"esri/request", "esri/config",
"esri/tasks/ClassBreaksDefinition", "esri/tasks/AlgorithmicColorRamp",
"esri/tasks/GenerateRendererParameters", "esri/tasks/GenerateRendererTask",
"esri/layers/LayerDrawingOptions",
"esri/symbols/SimpleFillSymbol", "esri/dijit/Legend",
"dojo/parser", "dojo/_base/array", "esri/Color", "dojo/dom-style",
"dojo/json", "dojo/dom",
"dojo/data/ItemFileReadStore",
"dijit/registry",
"dijit/layout/BorderContainer", "dijit/layout/ContentPane", "dijit/form/FilteringSelect",
"dojo/domReady!"
], function(
Map,
ArcGISTiledMapServiceLayer, ArcGISDynamicMapServiceLayer,
esriRequest, esriConfig,
ClassBreaksDefinition, AlgorithmicColorRamp,
GenerateRendererParameters, GenerateRendererTask,
LayerDrawingOptions,
SimpleFillSymbol, Legend,
parser, arrayUtils, Color, domStyle,
JSON, dom,
ItemFileReadStore,
registry
) {
parser.parse();
esriConfig.defaults.io.proxyUrl = "/proxy/";
app.dataUrl = "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/2";
app.defaultFrom = "#ffffcc";
app.defaultTo = "#006837";
app.map = new Map("map", {
center: [-85.787, 39.782],
zoom: 6,
slider: false
});
var basemap = new ArcGISTiledMapServiceLayer("https://services.arcgisonline.com/ArcGIS/rest/services/World_Terrain_Base/MapServer");
app.map.addLayer(basemap);
var ref = new ArcGISTiledMapServiceLayer("https://services.arcgisonline.com/ArcGIS/rest/services/Reference/World_Reference_Overlay/MapServer");
app.map.addLayer(ref);
// add US Counties as a dynamic map service layer
var urlDyn = "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer";
var usaLayer = new ArcGISDynamicMapServiceLayer(urlDyn, {
id: "us_counties",
opacity: 0.7,
visible: false
});
usaLayer.setVisibleLayers([2]);
app.map.addLayer(usaLayer);
// get field info
var countyFields = esriRequest({
url: app.dataUrl,
content: {
f: "json"
},
callbackParamName: "callback"
});
countyFields.then(function(resp) {
var fieldNames, fieldStore;
fieldNames = { identifier: "value", label: "name", items: [] };
arrayUtils.forEach(resp.fields.slice(6, 16), function(f) { // add some field names to the FS
fieldNames.items.push({ "name": f.name, "value": f.name });
});
fieldStore = new ItemFileReadStore({ data: fieldNames });
registry.byId("fieldNames").set("store", fieldStore);
registry.byId("fieldNames").set("value", "POP2007"); // set a value
}, function(err) {
console.log("failed to get field names: ", err);
});
// update renderer when field name changes
registry.byId("fieldNames").on("change", getData);
registry.byId("fieldNames").set("value", "POP_2007"); // triggers getData()
function getData() {
classBreaks(app.defaultFrom, app.defaultTo);
}
function classBreaks(c1, c2) {
var classDef = new ClassBreaksDefinition();
classDef.classificationField = registry.byId("fieldNames").get("value") || "POP2000";
classDef.classificationMethod = "natural-breaks"; // always natural breaks
classDef.breakCount = 5; // always five classes
var colorRamp = new AlgorithmicColorRamp();
colorRamp.fromColor = new Color.fromHex(c1);
colorRamp.toColor = new Color.fromHex(c2);
colorRamp.algorithm = "hsv"; // options are: "cie-lab", "hsv", "lab-lch"
classDef.baseSymbol = new SimpleFillSymbol("solid", null, null);
classDef.colorRamp = colorRamp;
var params = new GenerateRendererParameters();
params.classificationDefinition = classDef;
var generateRenderer = new GenerateRendererTask(app.dataUrl);
generateRenderer.execute(params, applyRenderer, errorHandler);
}
function applyRenderer(renderer) {
// dynamic layer stuff
var optionsArray = [];
var drawingOptions = new LayerDrawingOptions();
drawingOptions.renderer = renderer;
// set the drawing options for the relevant layer
// optionsArray index corresponds to layer index in the map service
optionsArray[2] = drawingOptions;
app.map.getLayer("us_counties").setLayerDrawingOptions(optionsArray);
app.map.getLayer("us_counties").show();
// create the legend if it doesn't exist
if ( ! app.hasOwnProperty("legend") ) {
createLegend();
}
}
function createLegend() {
app.legend = new Legend({
map : app.map,
layerInfos : [ {
layer : app.map.getLayer("us_counties"),
title : "US Counties"
} ]
}, dom.byId("legendDiv"));
app.legend.startup();
}
function errorHandler(err) {
// console.log("Something broke, error: ", err);
console.log("error: ", JSON.stringify(err));
}
});
</script>
</head>
<body class="tundra">
<div data-dojo-type="dijit/layout/BorderContainer"
data-dojo-props="design:'headline',gutters:false"
style="width: 100%; height: 100%; margin: 0;">
<div id="map"
data-dojo-type="dijit/layout/ContentPane"
data-dojo-props="region:'center'">
<div id="feedback" class="shadow">
<h3>Change the Attribute Field Used to Render Data</h3>
<div id="info">
<div id="note">
Note: This sample requires an ArcGIS Server version 10.1 map service to generate a renderer.
</div>
<label for="fieldNames">Render based on: </label>
<select id="fieldNames" name="baseSym"
data-dojo-type="dijit/form/FilteringSelect"
data-dojo-props="style:'width:200px;'">
</select>
<div id="legendDiv"></div>
</div>
</div>
</div>
</div>
</body>
</html>