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Getting x and y coordinates of a graphic on a feature layer when clicking it

ChristianDebono

I have a feature layer with a set of points in it. I want to get the x and y coordinates of a specific graphic when clicking it. I have done the following code but it is not giving the exact location.

on(map, "dbl-click", getCoordinates);  function getCoordinates(event) {                  var mp = esri.geometry.webMercatorToGeographic(event.mapPoint);                 alert(mp.x.toFixed(6) + ", " + mp.y.toFixed(6));                                                              }

[ATTACH=CONFIG]32230[/ATTACH]

I want to get the coordinates of the "M" symbol when the user clicks it.

Thanks for your help

point.png

holes_index_error.JPG

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Accepted answers

JakeSkinner

Try the following:

function selectInBuffer(response){   var feature;   var features = response.features;   var inBuffer = [];    for (var i = 0; i < features.length; i++) {     feature = features;     if(polygon.contains(feature.geometry)){       inBuffer.push(feature.attributes[featureLayer.objectIdField]);     }   }   var query = new Query();   query.objectIds = inBuffer;    featureLayer.selectFeatures(query, FeatureLayer.SELECTION_NEW, function(features, index){                     for(var i = 0; i < features.length; i++){           alert(features.geometry.x + ", " + features.geometry.y)       }   })           }

All comments

JakeSkinner

Hi Christian,

You can fire the 'getCoordinates' function when only the Feature Layer is clicked. Ex:

var featureLayer = new FeatureLayer("http://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer/0",{
    mode: FeatureLayer.MODE_ONDEMAND,
});
       
map.addLayer(featureLayer);

on(featureLayer, "click", getCoordinates);

function getCoordinates(event) {    
    var mp = esri.geometry.webMercatorToGeographic(event.mapPoint);
    alert(mp.x.toFixed(6) + ", " + mp.y.toFixed(6));                                       
}

ChristianDebono

Thanks a lot, worked perfectly

ChristianDebono

Is it possible to get the x and y coordinates of a specific point with out clicking it. For instance I written this code but it is not working.

featureLayer.selectFeatures(query, FeatureLayer.SELECTION_NEW, function (features, index) {
                   
                    var xLat = "";
                    for (var x = 0; x < features.length; x++) {
                        xLat = features.geometry.extent.xmax;
                     
                    }
                });

Thanks for your help

JakeSkinner

Yes, it's possible. How are you selecting which point you want the coordinates for? How do you want the coordinates returned (i.e. alert, dgrid)?

ChristianDebono

I'm selecting it by drawing a free hand polygon. A simple alert is enough. Below I have the code for selection

 function selectInBuffer(response) {
                var feature;
                var features = response.features;
                var inBuffer = [];

                for (var i = 0; i < features.length; i++) {
                    feature = features;
                    if (polygon.contains(feature.geometry)) {
                        inBuffer.push(feature.attributes[featureLayer.objectIdField]);
                    }
                }
                var query = new Query();
                query.objectIds = inBuffer;
           
                featureLayer.selectFeatures(query, FeatureLayer.SELECTION_NEW, function (features, index) {
                    dom.byId('resultDiv').innerHTML = "Number of meters within polygon:  <b>" + features.length + "</b>";

                    var xLat= "";
                    for (var x = 0; x < features.length; x++) {
                        xLat = features.geometry.extent.xmax;
                    }

                });
            }

JakeSkinner

Try the following:

function selectInBuffer(response){   var feature;   var features = response.features;   var inBuffer = [];    for (var i = 0; i < features.length; i++) {     feature = features;     if(polygon.contains(feature.geometry)){       inBuffer.push(feature.attributes[featureLayer.objectIdField]);     }   }   var query = new Query();   query.objectIds = inBuffer;    featureLayer.selectFeatures(query, FeatureLayer.SELECTION_NEW, function(features, index){                     for(var i = 0; i < features.length; i++){           alert(features.geometry.x + ", " + features.geometry.y)       }   })           }

ChristianDebono

Thanks for your help, worked perfectly!

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