Using two queries with a few different layers

EvanKarmazin

I have been working on finding samples that would give me an idea of where to go next. Alot of the sample I have found are back in the 1.6 javascript api
[HTML]http://resources.esri.com/help/9.3/arcgisserver/apis/javascript/arcgis/help/jssamples_start.htm#jssamples/query_bypoly.html[/HTML]
The objective I have is that I would like to allow users to search for a polygon location from one layer, and use a second query to determine if a different layer intersects the graphic returned by that first query.

While I realize the code is old, does the code below add the first query's graphic to the map then call the second query?

var firstGraphic = null;         // +++++Listen for QueryTask onComplete event+++++         dojo.connect(queryTask, "onComplete", function(graphics) {           firstGraphic = graphics.features[0];           var symbol = new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_SOLID, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleFillSymbol.STYLE_SOLID, new dojo.Color([100,100,100]), 3), new dojo.Color([255,0,0,0.20]));           firstGraphic.setSymbol(symbol);           firstGraphic.setInfoTemplate(infoTemplate);            map.graphics.add(firstGraphic);           query.geometry = firstGraphic.geometry;           query.spatialRelationship = esri.tasks.Query.SPATIAL_REL_TOUCHES;           queryTaskTouches.execute(query);           dojo.byId('messages').innerHTML = "<b>Executing Polygon Touches Query...</b>";

JasonZou

Not clear what you like to accomplish by reading your code. Do you like to query the TaxDistrict layer first, and then using the returned TaxDistrict features to query against Streams layer using spatial touch or spatial intersect?

There are some issues with your code:
1. Since there will be two queries and one will be performed after another, two functions will be needed, one to perform the first query; the other is the callback function of the first query, and will perform the second query.
2. You haven't defined the callback function for queryTaxDistrictsTask.

Here is the workflow I would have if you like to query TaxDistricts first, and the Streams layer the second based on the TaxDistricts query result.
function queryTaxDistrictsFunc() {
    county = document.getElementById("countyField").value;
    taxDistrict = document.getElementById("taxDistrict").value;
          var queryTaxDistrictsTask = new esri.tasks.QueryTask("url of the TaxDistricts layer");
   
    var queryTaxDistricts = new esri.tasks.Query();
    queryTaxDistricts.returnGeometry = true;
    queryTaxDistricts.outFields = ["DNAME", "CNAME"];
    queryTaxDistricts.where = "CNAME = '" + county + "' and DNAME = '" + taxDistrict + "'";
    queryTaxDistrictsTask.execute(queryTaxDistricts, callbackTaxDistrictsQuery);
}

function callbackTaxDistrictsQuery(featureSet) {
          firstGraphic = featureSet.features[0];
          var symbol = new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_SOLID, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleFillSymbol.STYLE_SOLID, new dojo.Color([100,100,100]), 3), new dojo.Color([255,0,0,0.20]));
          firstGraphic.setSymbol(symbol);
          firstGraphic.setInfoTemplate(infoTemplate);

          map.graphics.add(firstGraphic);
var queryStreamsTask = new esri.tasks.QueryTask("url of the Streams layer");
          query.geometry = firstGraphic.geometry;
          query.spatialRelationship = esri.tasks.Query.SPATIAL_REL_TOUCHES;
          queryStreamsTask.execute(query, callbackStreamsQuery);
}

function callbackStreamsQuery(featureSet) {
// do what ever you like to handle the Streams result here
}