what is the best practice for using ClassBreaksRender in buffer searching?

StephenLam — Fri, 12 Dec 2014 10:11:01 GMT

Referring to this topic, I can search the result within a drawn polygon, however it requires me to set a template for returned result:

var symbol = new SimpleMarkerSymbol(

SimpleMarkerSymbol.STYLE_CIRCLE,

12,

new SimpleLineSymbol(

SimpleLineSymbol.STYLE_NULL,

new Color([247, 34, 101, 0.9]),

new Color([207, 34, 171, 0.5])

);

featureLayer.setSelectionSymbol(symbol);

It works fine, but I want to make every returned records have its own color which is determined by its attributes value, i.e. blue color represents cars, yellow represents building, etc...

featureLayer.queryFeatures(query, function (featureSet) {

var inBuffer = [];

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

renderer.setMaxInclusive(true);

var categoryColorList = [];

var inBuffer = [];

for (var i = 0; i < featureSet.features.length; i++) {

if (featureSet.features.geometry == null)

continue;

inBuffer.push(featureSet.features.attributes[featureLayer.objectIdField]);

var rcolor = new Color([Math.floor((Math.random() * 255) + 1), Math.floor((Math.random() * 255) + 1), Math.floor((Math.random() * 255) + 1)]);

if (typeof eval("categoryColorList._" + featureSet.features.attributes.category_id)

== "undefined") {

eval("categoryColorList._" + featureSet.features.attributes.category_id + " = rcolor");

}

var symbol = new SimpleMarkerSymbol({

"color": eval("categoryColorList._" + featureSet.features.attributes.category_id),

"size": 5,

"angle": 0,

"xoffset": 0,

"yoffset": 0,

"type": "esriSMS",

"style": "esriSMSSquare",

"outline": { "color": eval("categoryColorList._" + featureSet.features.attributes.category_id), "width": 1, "type": "esriSLS", "style": "esriSLSSolid" }

});

renderer.addBreak({

field: "category_id",

minValue: featureSet.features.attributes.category_id,

maxValue: featureSet.features.attributes.category_id,

symbol: symbol

});

}

query = new Query();

query.objectIds = inBuffer;

(function (featureLayer) {

featureLayer.selectFeatures(query, esri.layers.FeatureLayer.SELECTION_NEW, function (results) {

featureLayer.refresh();

});

})(featureLayer);

});

Although within the polygon, the results are returned, the related records outside the polygon are also being shown. I was wondering if someone could let me know if there are something else that I should care about. I am not going to use graphic layer to store the returned result because I want to keep things simple, with only 1 feature layer, thanks you.

Re: what is the best practice for using ClassBreaksRender in buffer searching?

RobertScheitlin__GISP — Fri, 12 Dec 2014 21:14:10 GMT

Stephen,

That sample uses a Featurelayer that is already drawing ALL the layers feature and then just selecting the features that intersect the buffer and applies a symbol to the selected features. The way That I suggest that you go is to change the FeatureLayer to MODE_SELECTION that way none of the feature show until your buffer is done and then all your other code will be fine.

Re: what is the best practice for using ClassBreaksRender in buffer searching?

StephenLam — Fri, 16 Jan 2015 07:03:43 GMT

Thank you.

topic what is the best practice for using ClassBreaksRender in buffer searching? in ArcGIS JavaScript Maps SDK Questions

what is the best practice for using ClassBreaksRender in buffer searching?

Re: what is the best practice for using ClassBreaksRender in buffer searching?

Re: what is the best practice for using ClassBreaksRender in buffer searching?