Created
July 26, 2013 17:21
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load class breaks renderer from a map on arcgis.com, build boxes from map clicks and use class breaks renderer to symbolize boxes
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> | |
| <meta http-equiv="X-UA-Compatible" content="IE=7, IE=9, IE=10"> | |
| <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no"> | |
| <title></title> | |
| <link rel="stylesheet" href="//js.arcgis.com/3.6/js/esri/css/esri.css"> | |
| <style> | |
| html, body, #map { | |
| height: 100%; width: 100%; margin: 0; padding: 0; | |
| } | |
| </style> | |
| <script src="//js.arcgis.com/3.6/"></script> | |
| <script> | |
| var map; | |
| require([ | |
| "esri/map", | |
| "esri/request", | |
| "esri/renderers/ClassBreaksRenderer", | |
| "esri/graphic", | |
| "esri/geometry/Extent", | |
| "dojo/domReady!" | |
| ], function( | |
| Map, esriRequqest, ClassBreaksRenderer, Graphic, Extent | |
| ) { | |
| map = new Map("map", { | |
| basemap: "streets", | |
| center: [ 19.291, 48.343 ], | |
| zoom: 4 | |
| }); | |
| var renderer, valMin, valMax; | |
| // go get data from an arcgis.com map | |
| esriRequqest({ | |
| url: "http://www.arcgis.com/sharing/rest/content/items/503dfad7cb964dd6ad1f7ee49d5dccca/data", | |
| content: { | |
| f: "json" | |
| }, | |
| callbackParamName: "callback" | |
| }).then( | |
| function(data) { | |
| // console.log("data", data); | |
| var classes = data.operationalLayers[0].layerDefinition.drawingInfo.renderer; | |
| // console.log("classes", classes); | |
| renderer = new ClassBreaksRenderer(classes); | |
| // console.log("renderer", renderer); | |
| map.graphics.setRenderer(renderer); | |
| // keep min/max values | |
| valMin = classes.minValue + 1; | |
| valMax = classes.classBreakInfos[classes.classBreakInfos.length - 1].classMaxValue - 1; | |
| map.on("click", function(e) { | |
| console.log("click"); | |
| var valSym = parseInt(Math.random() * (valMax - valMin) + valMin); | |
| var attrs = {}; | |
| attrs[classes.field] = valSym; | |
| var padding = (map.extent.xmax - map.extent.xmin) / 10; | |
| var x = e.mapPoint.x; | |
| var y = e.mapPoint.y; | |
| var box = new Extent(x - padding, y - padding, x + padding, y + padding, map.spatialReference); | |
| map.graphics.add(new Graphic(box, null, attrs)); | |
| console.log("added"); | |
| }); | |
| }, | |
| function(error) { | |
| console.log("error", error); | |
| } | |
| ); | |
| }); | |
| </script> | |
| </head> | |
| <body> | |
| <div id="map"></div> | |
| </body> | |
| </html> |
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