topic Re: Cannot set opacity for graphicslayer in ArcGIS JavaScript Maps SDK Questions

Cannot set opacity for graphicslayer

TubaKumbara — Mon, 12 Mar 2018 15:26:33 GMT

Hello

I've added a graphicslayer. and a button.

var g = new GraphicsLayer(); // g is global variable: i can use this everywhere

mymap.add(g);

Button code

g.opacity = 0.5;

but nothing happening. i can see layer opacity as 0.5 on developer tools (f12) console but im seeing layer on 1 opacity.

Thanks.

Re: Cannot set opacity for graphicslayer

RobertScheitlin__GISP — Sat, 11 Dec 2021 10:34:59 GMT

Tuba,

I am not sure what you are doing wrong, so here is a sample that shows opacity working on a GL:

<!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>Shapes and Symbols</title>

    <link rel="stylesheet" href="https://js.arcgis.com/3.23/esri/css/esri.css">

    <style>
      #info {
        top: 20px;
        color: #444;
        height: auto;
        font-family: arial;
        right: 20px;
        margin: 5px;
        padding: 10px;
        position: absolute;
        width: 115px;
        z-index: 40;
        border: solid 2px #666;
        border-radius: 4px;
        background-color: #fff;
      }
      html, body, #mapDiv {
        padding:0;
        margin:0;
        height:100%;
      }
      button {
        display: block;
      }
    </style>

    <script src="https://js.arcgis.com/3.23/"></script>
    <script>
      var map, tb, gl;

      require([
        "esri/map", "esri/toolbars/draw",
        "esri/symbols/SimpleMarkerSymbol", "esri/symbols/SimpleLineSymbol", "esri/symbols/SimpleFillSymbol",
        "esri/symbols/PictureFillSymbol", "esri/symbols/CartographicLineSymbol", 
        "esri/graphic", "esri/layers/GraphicsLayer",
        "esri/Color", "dojo/dom", "dojo/on", "dojo/domReady!"
      ], function(
        Map, Draw,
        SimpleMarkerSymbol, SimpleLineSymbol, SimpleFillSymbol,
        PictureFillSymbol, CartographicLineSymbol, 
        Graphic, GraphicsLayer,
        Color, dom, on
      ) {
        map = new Map("mapDiv", {
          basemap: "streets",
          center: [-25.312, 34.307],
          zoom: 3
        });
        map.on("load", initToolbar);

        // markerSymbol is used for point and multipoint, see http://raphaeljs.com/icons/#talkq for more examples
        var markerSymbol = new SimpleMarkerSymbol();
        markerSymbol.setPath("M16,4.938c-7.732,0-14,4.701-14,10.5c0,1.981,0.741,3.833,2.016,5.414L2,25.272l5.613-1.44c2.339,1.316,5.237,2.106,8.387,2.106c7.732,0,14-4.701,14-10.5S23.732,4.938,16,4.938zM16.868,21.375h-1.969v-1.889h1.969V21.375zM16.772,18.094h-1.777l-0.176-8.083h2.113L16.772,18.094z");
        markerSymbol.setColor(new Color("#00FFFF"));

        // lineSymbol used for freehand polyline, polyline and line. 
        var lineSymbol = new CartographicLineSymbol(
          CartographicLineSymbol.STYLE_SOLID,
          new Color([255,0,0]), 10, 
          CartographicLineSymbol.CAP_ROUND,
          CartographicLineSymbol.JOIN_MITER, 5
        );

        // fill symbol used for extent, polygon and freehand polygon, use a picture fill symbol
        // the images folder contains additional fill images, other options: sand.png, swamp.png or stiple.png
        var fillSymbol = new PictureFillSymbol(
          "images/mangrove.png",
          new SimpleLineSymbol(
            SimpleLineSymbol.STYLE_SOLID,
            new Color('#000'), 
            1
          ), 
          42, 
          42
        );
        
        var fillSymbol2 = new SimpleFillSymbol(
          SimpleFillSymbol.STYLE_SOLID,
          new SimpleLineSymbol(
            SimpleLineSymbol.STYLE_SOLID,
            new Color('#000'), 
            1
          ),
          new Color([255,255,0,1])
        );

        function initToolbar() {
          gl = new GraphicsLayer({opacity: 0.5});
          map.addLayer(gl);
          tb = new Draw(map);
          tb.on("draw-end", addGraphic);

          // event delegation so a click handler is not
          // needed for each individual button
          on(dom.byId("info"), "click", function(evt) {
            if ( evt.target.id === "info" ) {
              return;
            }
            var tool = evt.target.id.toLowerCase();
            map.disableMapNavigation();
            tb.activate(tool);
          });
        }

        function addGraphic(evt) {
          //deactivate the toolbar and clear existing graphics 
          tb.deactivate(); 
          map.enableMapNavigation();

          // figure out which symbol to use
          var symbol;
          if ( evt.geometry.type === "point" || evt.geometry.type === "multipoint") {
            symbol = markerSymbol;
          } else if ( evt.geometry.type === "line" || evt.geometry.type === "polyline") {
            symbol = lineSymbol;
          }
          else {
            symbol = fillSymbol2;
          }

          gl.add(new Graphic(evt.geometry, symbol));
        }
      });
    </script>
  </head>
  
  <body>
    
    <div id="info">
      <div>Select a shape then draw on map to add graphic</div>
      <button id="Point">Point</button>
      <button id="Multipoint">Multipoint</button>
      <button id="Line">Line</button>
      <button id="Polyline">Polyline</button>
      <button id="FreehandPolyline">Freehand Polyline</button>
      <button id="Triangle">Triangle</button>
      <button id="Extent">Rectangle</button>
      <button id="Circle">Circle</button>
      <button id="Ellipse">Ellipse</button>
      <button id="Polygon">Polygon</button>
      <button id="FreehandPolygon">Freehand Polygon</button>
    </div>

    <div id="mapDiv"></div>

  </body>
</html>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Cannot set opacity for graphicslayer

TubaKumbara — Tue, 13 Mar 2018 06:18:24 GMT

Thanks for the answer.

I'm using JS 4.6. Yes your code seems like working good

But below code doesn't work even as your sample code.

gl = new GraphicsLayer();
map.addLayer(gl);
gl.opacity = 0.5;

As you can see i need to set layer opacity after add to map. Users on sometimes needs to change layer opacity after adding some graphics to gl.

Re: Cannot set opacity for graphicslayer

RobertScheitlin__GISP — Tue, 13 Mar 2018 15:45:37 GMT

Tuba,

Yes that does seem like a bug/undocumented limitation. Normally opacity is controlled by the graphics symbology though, so you can still adjust the graphics opacity but work directly with the graphic instead of the GraphicsLayer.

Re: Cannot set opacity for graphicslayer

TubaKumbara — Wed, 14 Mar 2018 05:56:25 GMT

Robert,

GL has many graphics which has different opacity. I've got one numberbox component for layer opacity. So i can't apply same opacity to all graphics. Some graphics needs to different opacity. I think this is a bug and hope fix as soon as possible.

Thanks.

Re: Cannot set opacity for graphicslayer

MKF62 — Sat, 11 Dec 2021 10:35:02 GMT

I am encountering a similar problem. I have not yet found a solution. I allow users to choose the opacity of my FeatureLayer via radio button, and then if they click a polygon, I create a new graphic from their selected polygon (hitTest) and set the symbol to be a blue outline. I add that graphic to a GraphicsLayer. Unfortunately, the graphic inherits the opacity from the FeatureLayer even if I set the opacity to something different on the GL.

GraphicsLayer takes on opacity from FeatureLayer

I have tried both

gl = new GraphicsLayer({opacity: 1});‍‍

and

gl.add(graphic);
map.add(gl);
gl.opacity = 1;‍‍‍‍‍‍

I have also tried setting the opacity on the actual graphic symbol:

color: [56, 247, 247, 1]‍

None of it works.

Re: Cannot set opacity for graphicslayer

RobertScheitlin__GISP — Wed, 14 Mar 2018 13:49:23 GMT

When you initialize a GL with a certain opacity in the constructor that opacity is used for all features in the GL. If you do not specify a opacity in the constructor then the only way currently to change the opacity of graphic(s) in the GL is to specify the alpha in the Graphics symbology.