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Color ramp symbols
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Description
Renderer.setColorInfo() allows you to render quantitative data with color ramp (continuous color) without breaks. (Added at version 3.8 of the JS API)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>Color Ramp</title>
<link rel="stylesheet" href="https://js.arcgis.com/3.29/esri/css/esri.css">
<style>
html, body, #map {
height: 100%;
margin: 0;
}
#info {
position: absolute;
left: 0;
bottom: 0;
padding: 10px;
background-color: #ddd;
font: 14px Segoe UI;
width: 200px;
text-align: center;
border-radius: 0 10px 0 0;
}
</style>
<script src="https://js.arcgis.com/3.29/"></script>
<script>
require([
"esri/map", "esri/geometry/Extent",
"esri/layers/FeatureLayer", "esri/InfoTemplate", "esri/dijit/Legend",
"esri/renderers/SimpleRenderer", "esri/Color",
"esri/symbols/SimpleFillSymbol", "esri/symbols/SimpleLineSymbol",
"dojo/domReady!"
], function(
Map, Extent,
FeatureLayer, InfoTemplate, Legend,
SimpleRenderer, Color,
SimpleFillSymbol, SimpleLineSymbol
) {
var map = new Map("map", {
extent: new Extent({"xmin":-2460944,"ymin":-1389910,"xmax":2297115,"ymax":1643787,"spatialReference":{"wkid":102003}})
});
var layer = new FeatureLayer("https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/USA_County_Crops_2007/FeatureServer/0", {
outFields: ["*"],
infoTemplate: new InfoTemplate("${COUNTY}, ${STATE}", "<div style='font: 18px Segoe UI'>The percentage of the area of the county that represents farmland is <b>${M086_07:NumberFormat(places:0)}%</b>.</div>")
});
var legend = new Legend({
map: map,
layerInfos: [{ title: "Percentage of county area used for farming", layer: layer }]
}, "legend");
layer.on("load", function(){
var renderer = new SimpleRenderer(new SimpleFillSymbol().setOutline(new SimpleLineSymbol().setWidth(0.1).setColor(new Color([128,128,128]))));
renderer.setColorInfo({
field: "M086_07",
minDataValue: 0,
maxDataValue: 100,
colors: [
new Color([255, 255, 255]),
new Color([127, 127, 0])
]
});
layer.setRenderer(renderer);
map.addLayer(layer);
legend.startup();
});
});
</script>
</head>
<body>
<div id="map"></div>
<div id="info"><div id="legend"></div></div>
</body>
</html>