Problem defining scale in LabelClass

TracySchloss · ‎06-02-2017

I have my labelClass defined as this:

HUClabelClass = new LabelClass({
labelExpressionInfo: {
"value": '{HU_8_Name}',
"maxScale": 250000
},
symbol: mySymbols.hucLabelSymbol() //MySymbols holds all the symbology for my project.
});

HUClayer.setLabelingInfo([ HUClabelClass ]);

I'm a little lost where I should place the maxScale parameter. It have placed it within the labelExpressionInfo and outside of it. I've tried quoting it, and leaving it without.

No matter what combination I try, my labels draw at all scales and that's not what I want to happpen.

RobertScheitlin__GISP · ‎06-03-2017

Tracy,

I can get the maxScale to work with this sample.

Just zoom into Rhode Island and see the label turn off:

<!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>Labeling features client-side</title>
    <link rel="stylesheet" href="https://js.arcgis.com/3.20/esri/css/esri.css">
    <style>
      html, body, #map {
        height: 100%; width: 100%; margin: 0; padding: 0; 
      }
    </style>

   <script src="https://js.arcgis.com/3.20/"></script>
    <script>
      var map;
    
      require([
        "esri/map", 
        "esri/geometry/Extent",
        "esri/layers/FeatureLayer",
        "esri/symbols/SimpleLineSymbol",
        "esri/symbols/SimpleFillSymbol",
        "esri/symbols/TextSymbol",
        "esri/renderers/SimpleRenderer",
        "esri/layers/LabelClass",
        "esri/Color",
         
        "dojo/domReady!"
      ], function(Map, Extent, FeatureLayer,
                  SimpleLineSymbol, SimpleFillSymbol, 
                  TextSymbol, SimpleRenderer, LabelClass, Color) 
      {
        // load the map centered on the United States
        var bbox = new Extent({"xmin": -1940058, "ymin": -814715, "xmax": 1683105, "ymax": 1446096, "spatialReference": {"wkid": 102003}});
      
        //create the map and set the extent, making sure to "showLabels"
        map = new Map("map", {
          extent: bbox,
          showLabels : true //very important that this must be set to true!   
        });

        // create a renderer for the states layer to override default symbology
        var statesColor = new Color("#666");
        var statesLine = new SimpleLineSymbol("solid", statesColor, 1.5);
        var statesSymbol = new SimpleFillSymbol("solid", statesLine, null);
        var statesRenderer = new SimpleRenderer(statesSymbol);
         
        // create the feature layer to render and label
        var statesUrl = "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/3";
        var states = new FeatureLayer(statesUrl, {
          id: "states",
          outFields: ["*"]
        });
        states.setRenderer(statesRenderer);


        // create a text symbol to define the style of labels
        var statesLabel = new TextSymbol().setColor(statesColor);
        statesLabel.font.setSize("14pt");
        statesLabel.font.setFamily("arial");

        //this is the very least of what should be set within the JSON  
        var json = {
          "labelExpressionInfo": {"value": "{STATE_NAME}"},
          "maxScale": 900000
        };

        //create instance of LabelClass (note: multiple LabelClasses can be passed in as an array)
        var labelClass = new LabelClass(json);
        labelClass.symbol = statesLabel; // symbol also can be set in LabelClass' json
        states.setLabelingInfo([ labelClass ]);
        map.addLayer(states);
    
      });
    </script>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍