Using IdentifyTasks/IdentifyParamters to find a grid cell

Question

I have a simple map service API that serves a grid feature and I want to grab an attribute ("Grid_Cell2") that has the grid cell name when the user clicks a button. The grid feature has start and end points (x, y) for each cell and a field called "Grid_Cell2" which is basically the grid cell name (ex: "Grid_Cell49_19"). I am already capturing my x, y for the mouse click on the map in my application. The examples I have seen for IdentifyTask and IdentifyParameters generally show the .executefor the IdentifyTask method being launched when the user clicks on the map (ex:map.on("click", executeIdentifyTask);`) and then populating a popup. I only want to grab the desired feature based on the users x, y (which I have already captured in a variable) when the user clicks the button. Assume I have already added the required module and function and initialized the function at the top: document.getElementById("btnGetInterval").onclick = function () { var point = additionalInfo["pointGeomOfInterest"]; //this is an x, y coordinate captured earlier in my code from the user's mouse click on the map identifyTask = new IdentifyTask(grid_url); identifyParams = new IdentifyParameters(); identifyParams.geometry = point; identifyParams.returnGeometry = false; //I don't want to return any geometry identifyParams.layerOption = IdentifyParameters.LAYER_OPTION_ALL; //Not sure about this. I just want to return the one feature for the grid cell whose boundaries my user's mouse click (x, y) falls within....‍‍‍‍‍‍‍ From here, I'm honestly not sure where to go; I assume I want to use a .execute statement but I am not sure how the `IdentifyParameters come into play. I also may need an empty var/array/list to hold the returned value (["Grid_Cell2"]). Any suggestions here?

JustinBridwell2 · Answer

I'm going to try that (queryTask) and then repost if I have similar questions.

RobertScheitlin__GISP · Answer

Justin,

Yes, I believe a query task would be more appropriate in this scenario. Yes you have to create a actual Point class not just pass an XY array and SR is Spatial Reference.

JustinBridwell2 · Answer

Question: since I am basically just trying to get the value of a single field from a single feature on my map service, would it be easier to use `Query` and `QueryTask`? Also, what you're saying is that I can't simply plug in an x, y coordinate into .geometry? I need to initialize it as an ESRI point first? So, something like this:

var spatRef = new esri.SpatialReference({wkid:4326});
var point = new Point(additionalInfo["pointGeomOfInterest"].x, additionalInfo["pointGeomOfInterest"].y, spatRef);

I assume SR = spatial reference.