topic Re: QueryTask output behind? in ArcGIS API for Flex Questions

QueryTask output behind?

JayGregory — Thu, 17 Feb 2011 03:46:28 GMT

Hopefully this will be the last issue I have:
In short, I've created a Query that detects whether a mouse click is within a polygon. If it is, a point is placed on the map, if not, an error is displayed. It works most of the time except the first time the mouse click is in a different location (with regards to in polygon/ outside polygon) than the previous.
For instance, when the map is loaded, if I click inside the polygon, nothing happens. Then if I click inside the polygon again, behavior is as expected. I can continue clicking inside the polygon and behavior is as expected. As soon as I click outside the polygon for the first time, it acts as if I've clicked inside the polygon (creating the graphic, etc.). Then if I click outside the polygon a second time, behavior is as expected (no graphic, warning, etc.). I can continue clicking outside the polygon again and again, and it works. Until I click inside the polygon again, at which point it still thinks I'm clicking outside, but only for the first click. And so on and so forth.
Any ideas? Do I have to specify some attribute in the QueryTaks, or is there something else I am missing? Thanks!

Here is the function:
private function onMapClick(event:MapMouseEvent):void
   {
    query.geometry = event.mapPoint;
    queryTask.execute(query);
    var num:int = queryTask.executeLastResult.features.length;
    Alert.show(num.toString());
    if ( num != 1){
     Alert.show("All stops must be located inside Philadelphia County");
     return;
    }
    var point:MapPoint = event.mapPoint;
    var myGraphicMarker:Graphic = new Graphic(point,userMarks);
    myGraphicMarker.toolTip = "Added stop";
    userClicks.add(myGraphicMarker);
    stops.push(myGraphicMarker);
    messages.text = stops.length.toString() + " total stops"

   }

Re: QueryTask output behind?

MehulChoksey — Sat, 11 Dec 2021 12:10:18 GMT

When you make a query request to the server, you have to wait for the results to come(unless you are binding the executelastresult to a component). This can be achieved by either:
1.Using Responder sample for using the same is at: http://help.arcgis.com/en/webapi/flex/samples/index.html?sample=QueryResultsWithChart
2. Adding executeComplete event listener to querytask and in event handler perform rest of your steps:
i.e.

var num:int = queryTask.executeLastResult.features.length;
    Alert.show(num.toString());
    if ( num != 1){
     Alert.show("All stops must be located inside Philadelphia County");
     return;
    }
    var point:MapPoint = event.mapPoint;
    var myGraphicMarker:Graphic = new Graphic(point,userMarks);
    myGraphicMarker.toolTip = "Added stop";
    userClicks.add(myGraphicMarker);
    stops.push(myGraphicMarker);
    messages.text = stops.length.toString() + " total stops"

Re: QueryTask output behind?

JayGregory — Sat, 11 Dec 2021 12:10:21 GMT

Thank you so much - this was the answer.

When you make a query request to the server, you have to wait for the results to come(unless you are binding the executelastresult to a component). This can be achieved by either:
1.Using Responder sample for using the same is at: http://help.arcgis.com/en/webapi/flex/samples/index.html?sample=QueryResultsWithChart
2. Adding executeComplete event listener to querytask and in event handler perform rest of your steps:
i.e.
var num:int = queryTask.executeLastResult.features.length;
    Alert.show(num.toString());
    if ( num != 1){
     Alert.show("All stops must be located inside Philadelphia County");
     return;
    }
    var point:MapPoint = event.mapPoint;
    var myGraphicMarker:Graphic = new Graphic(point,userMarks);
    myGraphicMarker.toolTip = "Added stop";
    userClicks.add(myGraphicMarker);
    stops.push(myGraphicMarker);
    messages.text = stops.length.toString() + " total stops"