javascript api user defined symbology

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07-21-2016 11:58 AM
TylerWaring
Occasional Contributor II

Greetings,

     I have a nice little ESRI Javascript API application pointed at an ArcGIS Server instance. The client would like to change the symbology of any given feature in the application. They have the ability to turn on and off multiple layers but sometimes the users want the ability to change symbology in the event that the symbology looks bad when combined. Is there any way to give the user the ability do define the colors of the renderer using a color picker or something?

Thanks, Tyler

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SteveCole
Frequent Contributor

Yeeup, that's the basic idea. I've done this in one of my apps that has a graphicsLayer that contains user sketched graphics on the map:

sketchColorProps.jpg

It's basically two ColorPicker widgets and utilize the color-change event to update a symbol that the layer's renderer uses.

        var pickerOutline = new ColorPicker({

            color: "#ff0000",

            showRecentColors: false,

            showTransparencySlider: false

        }, "clrOutline");

        pickerOutline.startup();

        pickerOutline.on("color-change", function(evt) {

            var theOutline = fillSymbol.outline;

            theOutline.color = pickerOutline.color;

            fillSymbol.setOutline(theOutline);

            theGLayer.redraw();

        });

       

        var pickerFill = new ColorPicker({

            color: "#FFFF00",

            showRecentColors: false,

            showTransparencySlider: false

        }, "clrFill");

        pickerFill.startup();

       

        pickerFill.on("color-change", function(evt) {

            if(evt.color.toString() === "no-color") {

                fillSymbol.setStyle(SimpleFillSymbol.STYLE_NULL);

            } else {

                fillSymbol.setStyle(SimpleFillSymbol.STYLE_SOLID);

                fillSymbol.color = pickerFill.color;

            }

            lineSymbol.color = pickerFill.color;

            theGLayer.redraw();           

        });

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3 Replies
SteveCole
Frequent Contributor

Yeeup, that's the basic idea. I've done this in one of my apps that has a graphicsLayer that contains user sketched graphics on the map:

sketchColorProps.jpg

It's basically two ColorPicker widgets and utilize the color-change event to update a symbol that the layer's renderer uses.

        var pickerOutline = new ColorPicker({

            color: "#ff0000",

            showRecentColors: false,

            showTransparencySlider: false

        }, "clrOutline");

        pickerOutline.startup();

        pickerOutline.on("color-change", function(evt) {

            var theOutline = fillSymbol.outline;

            theOutline.color = pickerOutline.color;

            fillSymbol.setOutline(theOutline);

            theGLayer.redraw();

        });

       

        var pickerFill = new ColorPicker({

            color: "#FFFF00",

            showRecentColors: false,

            showTransparencySlider: false

        }, "clrFill");

        pickerFill.startup();

       

        pickerFill.on("color-change", function(evt) {

            if(evt.color.toString() === "no-color") {

                fillSymbol.setStyle(SimpleFillSymbol.STYLE_NULL);

            } else {

                fillSymbol.setStyle(SimpleFillSymbol.STYLE_SOLID);

                fillSymbol.color = pickerFill.color;

            }

            lineSymbol.color = pickerFill.color;

            theGLayer.redraw();           

        });

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TylerWaring
Occasional Contributor II

Thanks a ton. I changed it around a little and swapped out the legend items with spectrum.js colorpickers and it works like a charm.

SteveCole
Frequent Contributor

You can also fully change the renderer for a featureLayer as well. Here's another example where I'm changing the renderer for a USGS earthquake feed to have more levels of symbology (and custom icons):

        var theUsgsEarthquakeLayer = new FeatureLayer("http://igems.doi.gov/arcgis/rest/services/igems_haz/MapServer/3", {

          id: "quakes",

          mode: FeatureLayer.MODE_ONDEMAND,

          refreshInterval: 5,

          autoGeneralize: false,

          outFields: ["*"]

        });

               

        if (theUsgsEarthquakeLayer != null) {

            //define a popup template

            var usgsQuakeTemplate = new InfoTemplate();

            usgsQuakeTemplate.setContent(formatQuakeContent);

            usgsQuakeTemplate.setTitle("Magnitude ${magnitude} Earthquake");

            theUsgsEarthquakeLayer.setInfoTemplate(usgsQuakeTemplate);

            theUsgsEarthquakeLayer.setAutoGeneralize(false);

            //Create a different renderer with new symbols           

            var renderer = new ClassBreaksRenderer(null, "magnitude");

            renderer.addBreak(0, 3, blueMarkerSymb);

            renderer.addBreak(3, 5, greenMarkerSymb);

            renderer.addBreak(5, 7, orangeMarkerSymb);

            renderer.addBreak(7, 9, redMarkerSymb);

            renderer.addBreak(9, Infinity, purpleMarkerSymb);

            theUsgsEarthquakeLayer.setRenderer(renderer);

        } else {

            // Define the USGS Earthquake layer retrieved from a KML file instead

            theUsgsEarthquakeLayer = new KMLLayer("http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/1.0_week_age_link.kml", {

                id: 'quakes',

                refreshInterval: 5,

                visible: true

            });

        }