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BlendRenderer - Los Angeles housing status
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Description
This sample displays housing status concentrations throughout the Greater Los Angeles area. Red indicating renter-occupied, green is vacant, whereas blue represents owner-occupied housing. The more opaque the color, the higher the concentration for that specific type of housing. More information on working with the BlendRenderer can be found here.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>BlendRenderer: Los Angeles housing status</title>
<link rel="stylesheet" href="https://js.arcgis.com/3.46/dijit/themes/claro/claro.css">
<link rel="stylesheet" href="https://js.arcgis.com/3.46/esri/css/esri.css">
<style>
html, body, #map {
height: 100%;
margin: 0;
}
#meta {
position: absolute;
left: 20px;
bottom: 20px;
width: 20em;
height: 16em;
z-index: 40;
background: #ffffff;
color: #777777;
padding: 5px;
border: 2px solid #666666;
border-radius: 5px;
font-family: arial;
font-size: 0.9em;
}
#meta h3 {
color: #666666;
font-size: 1.1em;
padding: 0px;
margin: 0px;
display: inline-block;
}
</style>
<script src="https://js.arcgis.com/3.46/"></script>
<script>
require([
"esri/Color", "esri/dijit/PopupTemplate", "esri/layers/FeatureLayer", "esri/map", "esri/renderers/BlendRenderer",
"esri/symbols/SimpleFillSymbol", "esri/symbols/SimpleLineSymbol", "dojo/domReady!"
], function (Color, PopupTemplate, FeatureLayer, Map, BlendRenderer, SimpleFillSymbol, SimpleLineSymbol){
map = new Map("map", {
basemap: "topo-vector",
center: [-118.40, 34.06],
zoom: 12
});
//Set the blendRenderer's parameters
var blendRendererParams = {
//blendMode:"overlay" //By default, it uses "source-over", uncomment to display different mode
//See: http://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/globalCompositeOperation
symbol: new SimpleFillSymbol().setOutline(new SimpleLineSymbol().setWidth(0)),
fields: [
{
field: "OWNER_CY",
color: new Color([0, 0, 255])
}, {
field: "RENTER_CY",
color: new Color([255, 0, 0])
}, {
field: "VACANT_CY",
color: new Color([0, 255, 0])
}
],
opacityStops: [
{
value: .1,
opacity: 0
},
{
value: 1,
opacity: .7
}
],
normalizationField: "TOTHU_CY"
};
//Create the PopupTemplate to be used to display demographic info
var template = new PopupTemplate({
"title": "Housing Status by Census Block",
"fieldInfos": [
{
"fieldName": "OWNER_CY",
"label": "Number of Owner Occupied Houses",
"visible": true,
"format": {
"places": 0,
"digitSeparator": true
}
}, {
"fieldName": "RENTER_CY",
"label": "Number of Renter Occupied Houses",
"visible": true,
"format": {
"places": 0,
"digitSeparator": true
}
}, {
"fieldName": "VACANT_CY",
"label": "Number of Vacant Houses",
"visible": true,
"format": {
"places": 0,
"digitSeparator": true
}
}, {
"fieldName": "TOTHU_CY",
"label": "Total Housing Units",
"visible": true,
"format": {
"places": 0,
"digitSeparator": true
}
}
]
});
var layerUrl = "https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/Blocks%20near%20Wilshire%20enriched%20with%20Key%20Facts/FeatureServer/0";
var renderer = new BlendRenderer(blendRendererParams);
layer = new FeatureLayer(layerUrl, {
id: "blendedLayer",
outFields: ["TOTHU_CY", "RENTER_CY", "OWNER_CY", "VACANT_CY"],
opacity: 1,
definitionExpression: "TOTHU_CY > 0",
infoTemplate: template
});
layer.setRenderer(renderer);
map.addLayer(layer);
});
</script>
</head>
<body class="claro">
<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="meta">
<h3>Los Angeles housing status displayed using a BlendRenderer</h3>
<br>
<br>This sample displays housing status concentrations throughout the Greater Los Angeles area.
<ul>
<li>Red: Renter occupied</li>
<li>Blue: Owner occupied</li>
<li>Green: Vacant</li>
</ul>
The more opaque the color, the higher the concentration for that housing status.
</div>
</div>
</div>
</body>
</html>