Select by URL Parameters - zoom to point?

LizDaRos · ‎02-29-2012

I'm trying to use the code sample here to use URL parameters to select one or more POINT features and zoom the map to those features. I have configured it using one of my polygon features and it works but I'm trying to use it for a point feature.
When I try passing this URL parameter the symbol appears around the point but the map does not zoom in or display the points information. Also I get this error- TypeError: query.geometry is null
Does anyone know what I need to add to my code to allow this to work properly? I've tried a few different ways but not having much luck.

HemingZhu · ‎03-01-2012

I'm trying to use the code sample here to use URL parameters to select one or more POINT features and zoom the map to those features. I have configured it using one of my polygon features and it works but I'm trying to use it for a point feature.
When I try passing this URL parameter the symbol appears around the point but the map does not zoom in or display the points information. Also I get this error- TypeError: query.geometry is null
Does anyone know what I need to add to my code to allow this to work properly? I've tried a few different ways but not having much luck.

From the error message, I think the problem lies in the queryExtent in your executeQueryTask(evt) function. Try this to see if it works:

function executeQueryTask(evt)
{

    query.where = "";
    var centerPoint = evt.mapPoint;
    var mapWidth = theMap.extent.getWidth();
    var pixelWidth = mapWidth/theMap.width;
    //Calculate a 10 pixel envelope width (5 pixel tolerance on each side)
     var tolerance = 5 * pixelWidth;    
     var queryExtent = new esri.geometry.Extent(centerPoint.x -tolerance, centerPoint.y -tolerance, centerPoint.x +tolerance, centerPoint.y +tolerance, theMap.spatialReference);
     query.geometry = queryExtent;

    queryTask.execute(query, showResults);
}

LizDaRos · ‎03-02-2012

Thanks for taking a look at it, unfortunately I still get the same error. Could the issue also be in-
var ResultEnv = query.geometry.getExtent().expand(10.0);

??

HemingZhu · ‎03-02-2012

Thanks for taking a look at it, unfortunately I still get the same error. Could the issue also be in-
var ResultEnv = query.geometry.getExtent().expand(10.0);

??

Yes, you need to change make similiar changes on you showResults function.

LizDaRos · ‎03-02-2012

I tried-
     function showResults(featureSet)

//Zoom to the extent of the graphics
query.where = "";
    var centerPoint = evt.mapPoint;
    var mapWidth = theMap.extent.getWidth();
    var pixelWidth = mapWidth/theMap.width;
    //Calculate a 10 pixel envelope width (5 pixel tolerance on each side)
     var tolerance = 5 * pixelWidth;
     var queryExtent = new esri.geometry.Extent(centerPoint.x -tolerance, centerPoint.y -tolerance, centerPoint.x +tolerance, centerPoint.y +tolerance, theMap.spatialReference);
     query.geometry = queryExtent;
var ResultEnv = query.geometry.getExtent().expand(10.0);
theMap.setExtent(ResultEnv);

but I get an error: ReferenceError: evt is not defined

HemingZhu · ‎03-02-2012

I tried-
     function showResults(featureSet)

//Zoom to the extent of the graphics
query.where = "";
    var centerPoint = evt.mapPoint;
    var mapWidth = theMap.extent.getWidth();
    var pixelWidth = mapWidth/theMap.width;
    //Calculate a 10 pixel envelope width (5 pixel tolerance on each side)
     var tolerance = 5 * pixelWidth;
     var queryExtent = new esri.geometry.Extent(centerPoint.x -tolerance, centerPoint.y -tolerance, centerPoint.x +tolerance, centerPoint.y +tolerance, theMap.spatialReference);
     query.geometry = queryExtent;
var ResultEnv = query.geometry.getExtent().expand(10.0);
theMap.setExtent(ResultEnv);

but I get an error: ReferenceError: evt is not defined

You will have to use the featureSet's extent not evt. Like this:

 
var ResultEnv =esri.graphicsExtent(featureSet.features);
theMap.setExtent(ResultEnv);