topic Re: Featurelayer highlight vs select in ArcGIS JavaScript Maps SDK Questions

Featurelayer highlight vs select

EdwardSohn2 — Wed, 19 Nov 2014 00:59:04 GMT

What is the best way to "highlight" a feature on a featurelayer, or a graphic on a graphicslayer, much in the same way a feature is highlighted when user clicks on it to show the InfoWindow (but without showing the InfoWindow). This is different from the selection of a feature which is controlled by setting the selection symbol. Also do not want to actually select the feature if possible.

(Usually the highlight feature surrounds the feature with a box with a cross overlaid on it.)

Thanks.

Re: Featurelayer highlight vs select

RobertScheitlin__GISP — Wed, 19 Nov 2014 20:50:45 GMT

Edward,

I think this sample is what you are looking for (be aware the use of the "target" SMS style is undocumented and subject to change):

<!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>Drop Down Test</title>  
  <link rel="stylesheet" href="http://js.arcgis.com/3.10/js/dojo/dijit/themes/claro/claro.css">     
  <link rel="stylesheet" href="http://js.arcgis.com/3.10/js/esri/css/esri.css">  
  <style>  
    html,  
    body,  
    #mainWindow {  
      height: 100%;  
      width: 100%;  
      margin: 0;  
      padding: 0;  
    }  
    body {  
      background-color: #FFF;  
      overflow: hidden;  
      font-family: "Trebuchet MS";  
    }  
    #header {  
      height: 3%;  
      overflow: auto;  
    }  
  </style>    
  <script src="http://js.arcgis.com/3.10/"></script>  
  <script>  
    var map;  
    require([  
      "esri/map",  
      "dojo/on",  
      "esri/tasks/query",
      "esri/graphic",
      "esri/layers/FeatureLayer",
      "esri/symbols/SimpleMarkerSymbol",
      "esri/symbols/CartographicLineSymbol",
      "esri/Color",
      "dojo/store/Memory",  
      "dojo/_base/array",  
      "dojo/_base/lang",  
      "esri/request",  
      "dojo/json",
      "dojo/parser",
      "dijit/registry",
      "dijit/layout/BorderContainer",
      "dijit/layout/ContentPane",  
      "dijit/form/Button",  
      "dijit/form/ComboBox",  
      "dojo/domReady!"  
    ], function(  
      Map, on, Query, Graphic, FeatureLayer, SimpleMarkerSymbol, CartographicLineSymbol, Color, Memory, array, lang, esriRequest, json, parser, registry 
    ) {
      parser.parse();
      
      map = new Map("map", {  
        basemap: "topo",  
        center: [-120.1883, 37.0868],  
        zoom: 6  
      });  

      var vendors = new FeatureLayer("http://services.arcgis.com/V6ZHFr6zdgNZuVG0/ArcGIS/rest/services/ALL_City_Vendors/FeatureServer/0", {   
        outFields: ["*"]
      });
      
      //point target symbol
      var cls = new CartographicLineSymbol(CartographicLineSymbol.STYLE_SOLID, new Color([0,255,255,1]), 2, CartographicLineSymbol.CAP_ROUND, CartographicLineSymbol.JOIN_ROUND);
      var sms = new SimpleMarkerSymbol("target", 16, cls, new Color([0,0,0,0]));
      sms._spikeSize = 7;
      sms._targetHeight = 17;
      sms._targetWidth = 17;
      sms.setAngle(0);

      map.addLayers([vendors]);  
      map.on("layers-add-result", lang.hitch(this, function(){  
        var url = "http://services.arcgis.com/V6ZHFr6zdgNZuVG0/ArcGIS/rest/services/ALL_City_Vendors/FeatureServer/0/generateRenderer";  
        var classificationDef = {"type":"uniqueValueDef","uniqueValueFields":["Vendor_Name"]};
        var str = json.stringify(classificationDef);
        esriRequest({  
          url:url,  
          content:{  
            classificationDef:str,  
            f:'json'  
          },  
          handleAs:'json',  
          callbackParamName:'callback',  
          timeout:15000  
        }).then(lang.hitch(this,function(response){  
          var uniqueValueInfos = response && response.uniqueValueInfos;  
          if(uniqueValueInfos){  
            var store2 = new Memory({data:[]});  
            registry.byId("uniqueValuesSelect").set('store',store2);  
            var data = array.map(uniqueValueInfos,lang.hitch(this,function(info,index){  
              var value = info.value;  
              //value = parseFloat(value);  
              var dataItem = {  
                id:index,  
                name:value  
              };  
              return dataItem;  
            }));  
            store2 = new Memory({data:data});  
            registry.byId("uniqueValuesSelect").set('store',store2);  
          }  
        }),lang.hitch(this,function(error){  
          console.error(error);  
        }));
      }));
      
      registry.byId("clearBtn").on("click", function(){
        map.graphics.clear();
      });
      
      registry.byId("uniqueValuesSelect").on("change", function(){
        var query = new Query();
        query.where = "Vendor_Name='" + registry.byId("uniqueValuesSelect").get('value') + "'"; 

        console.info(query.where);
        query.returnGeometry = true;  
        vendors.queryFeatures(query, function (featureSet) {  
          var Geom = featureSet.features[0].geometry;
          var gra = new Graphic(Geom, sms);
          map.graphics.add(gra);   
          map.centerAndZoom(Geom, 16);  
        });
      });

    });  
  </script>  
</head>  

<body class="claro">  
  <div id="mainWindow" data-dojo-type="dijit/layout/BorderContainer" data-dojo-props="design:'headline', gutters:false" style="padding:0px;margin:0px;">
    <div id="header" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'top'" style="overflow:hidden;border:none;border-bottom: 3px solid #CC9900;font-family: Windows;font-size:14pt; color: #FFFFFF;background: #000000; "> Select a Vendor name and it will be selected and zoomed to it on the map:    
      <select id="uniqueValuesSelect" data-dojo-type="dijit/form/ComboBox"></select>
      <button id="clearBtn" data-dojo-type="dijit/form/Button">Clear Selection</button>
    </div>
    <div id="map" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'left'" style="width:100%;height:95%;border:none;padding:0px;margin:0px;"></div>
  </div>
</body>
  
</html>

Re: Featurelayer highlight vs select

EdwardSohn2 — Thu, 20 Nov 2014 04:06:35 GMT

Thank you. Will look at it.

Is there a best way to do the same for polylines and polygon shapes?

Re: Featurelayer highlight vs select

EdwardSohn2 — Thu, 20 Nov 2014 05:18:57 GMT

Figured out for polygons. I guess for polylines, just use SimpleLineSymbol..?

Re: Featurelayer highlight vs select

RobertScheitlin__GISP — Thu, 20 Nov 2014 13:42:15 GMT

Edward,

Correct just use a SimpleLineSymbol.

Don't forget to mark this thread as answered, by clicking the "Correct Answer" button on the reply that answered your question.

Re: Featurelayer highlight vs select

EdwardSohn2 — Thu, 20 Nov 2014 17:14:11 GMT

Is there a way to prevent the mouse-over and mouse-out events for the map.graphics layer or for a separate graphics layer? The issue is as follows. I am highlighting (not selecting) a feature as user mouse over it. It works, however the addition of the highlight symbol (above) to the featurelayer is causing additional unwanted mouse-over/out events to be fired because of the overlaying of the highlight graphic over the featurelayer. This is causing multiple mouse-over/out events to be fired causing the highlight symbol to flicker.

Events:

featurelayer: mouse-over (highlight graphic is added over the feature)

featurelayer: mouse-out (highlight graphic is removed)

highlight graphic: mouse-over

highlight graphic: mouse-out

featurelayer: mouse-over (highlight graphic is added over the feature)

featurelayer: mouse-out (highlight graphic is removed)

highlight graphic: mouse-over

highlight graphic: mouse-out

featurelayer: mouse-over (highlight graphic is added over the feature)

featurelayer: mouse-out (highlight graphic is removed)

etc... as mouse moves over the feature.

This is happening even though there is no mouseover/out event handlers defined for the highlight graphics/layer.

One way to prevent this may be to prevent the mouseover/out events for the highlight graphics layer so only one set of events is fired:

featurelayer: mouse-over (highlight graphic is added over the feature)

featurelayer: mouse-out (highlight graphic is removed)

Perhaps the highlight graphic can be added to a separate graphicslayer and put this at bottom of the layer ordering under the featurelayer?

Re: Featurelayer highlight vs select

EdwardSohn2 — Thu, 20 Nov 2014 17:32:09 GMT

I figured out!

Thanks for your replies.