Hi, allI am working on an application similar to the equal interval break demo at: http://help.arcgis.com/en/webapi/javascript/arcgis/samples/renderer_equal_interval/index.html. I was able to get the break value but not able to add the breaks to the renderer. I can only get the default symbols to show on my map.The attribute field I am working with contains some null values.Could that be the problem?here is the code of the rendering function. Any ideas? thanks.Lu
function initOperationalLayer() {
featureLayer = new esri.layers.FeatureLayer("http://..../MapServer/0", {
mode: esri.layers.FeatureLayer.MODE_SNAPSHOT,
outFields: ["*"],
id:"city_expense"
});
var query = new esri.tasks.Query();
query.where = "1=1";
featureLayer.queryFeatures(query, function(featureSet) {
var features = featureSet.features;
var min = max = parseFloat(features[0].attributes['sqldb27.SDE.afr_2010.publicSafety_e']);
dojo.forEach(features, function(feature) {
min = Math.min(min, feature.attributes['sqldb27.SDE.afr_2010.publicSafety_e']);
max = Math.max(max, feature.attributes['sqldb27.SDE.afr_2010.publicSafety_e']);
});
//divide the range of values by the number of classes to find the interval
var numRanges = dijit.byId("breakLevel").get('displayedValue');
var breaks = (max - min) / numRanges;
var outline = new esri.symbol.SimpleLineSymbol().setWidth(1);
var fillColor = new dojo.Color([240, 150, 240, 0.75]);
var defaultSymbol = new esri.symbol.SimpleMarkerSymbol().setSize(2).setOutline(outline);
var renderer = new esri.renderer.ClassBreaksRenderer(defaultSymbol, 'sqldb27.SDE.afr_2010.publicSafety_e');
//add the breaks using the interval calculated above
for (var i = 0; i < numRanges; i++) {
renderer.addBreak(parseFloat(min + (i * breaks)), parseFloat(min + ((i + 1) * breaks)), new esri.symbol.SimpleMarkerSymbol().setSize((i + 1) * 4).setColor(fillColor).setOutline(outline));
}
featureLayer.setRenderer(renderer);
});
map.addLayers(featureLayer);
}
