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need map to include all surrounding areas

TonyRopson

I am attempting to have a map that highlights areas within a certain mile radius of a user selected point. I am using a query task to return the geometry of those areas but I am having some trouble expanding the map to include all the areas returned by the query task. Code snippets:

  function init() {             map = new esri.Map("mapDiv");             var layer = new esri.layers.ArcGISDynamicMapServiceLayer("http://lrs.co.columbia.wi.us/ArcGIS/rest/services/LRS/TaxParcels_Parcels/MapServer")             map.addLayer(layer);     for (j = 0; j < parnums.length; j++) {                 queryTask = new esri.tasks.QueryTask("http://lrs.co.columbia.wi.us/ArcGIS/rest/services/LRS/TaxParcels_Parcels/MapServer/1");                 query = new esri.tasks.Query();                 query.returnGeometry = true;                 query.text = parnums                 queryTask.execute(query, gettingResults);      function gettingResults(resultFeatures) {    featholding.push(resultFeatures); // this is the area the end user selected  var newExtent = esri.graphicsExtent(SearchPar[0].features)  //this is where I attempt to enclude the other areas that were returned by the  queryTask  for (j = 0; j < featholding.length; j++){                 var Uextent=esri.graphicsExtent(featholding.features)                 newExtent.union(Uextent)              }                               map.setExtent(newExtent.expand(1.1),true); }

I found union in the api docs but I am wondering if I am using it correctly
Thanks

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Accepted answers

derekswingley1

Ah, OK. So you're doing multiple queries and want to zoom to the extent of the features returned by all queries, correct?

If that's the case, i'd recommend using a deferredList so that you know when all the queries finish. We discussed this approach on the forums before...see this thread: http://forums.arcgis.com/threads/37417

All comments

derekswingley1

TonyRopson

one query task but it does get called many times

  for (j = 0; j < parnums.length; j++) {
                queryTask = new esri.tasks.QueryTask("http://lrs.co.columbia.wi.us/ArcGIS/rest/services/LRS/TaxParcels_Parcels/MapServer/1");
                query = new esri.tasks.Query();
                query.returnGeometry = true;
                query.text = parnums
                queryTask.execute(query, gettingResults);
}

I will like to fit the results of the returned geometry into the viewer.

derekswingley1

Are you running more than one query task?

TonyRopson

yes I would but when I use

function gettingResults(resultFeatures) {

 featholding.push(resultFeatures);
                newExtent = esri.graphicsExtent(resultFeatures.features)
                map.setExtent(newExtent, true);
}

All it is doing is showing the last piece of geometry that it was sent by the query task. The query task is sending gettingResults about 8-10 separate pieces of geometry and I would like the map to be expanded to show them all.

This is the last piece of the puzzle before this goes into production, so I very much appreciate the help everyone is giving me on this.

derekswingley1

In your gettingResults function, wouldn't you just want to use the extent of resultFeatures?

TonyRopson

I switched things up a bit and have this

function init() {
            map = new esri.Map("mapDiv");
            var layer = new esri.layers.ArcGISDynamicMapServiceLayer("http://lrs.co.columbia.wi.us/ArcGIS/rest/services/LRS/TaxParcels_Parcels/MapServer")
            map.addLayer(layer);


  for (j = 0; j < parnums.length; j++) {
                queryTask = new esri.tasks.QueryTask("http://lrs.co.columbia.wi.us/ArcGIS/rest/services/LRS/TaxParcels_Parcels/MapServer/1");
                query = new esri.tasks.Query();
                query.returnGeometry = true;
                query.text = parnums
                queryTask.execute(query, gettingResults);


   function gettingResults(resultFeatures) {
   featholding.push(resultFeatures);
// this is the area the end user selected
 var newExtent = esri.graphicsExtent(SearchPar[0].features)

//this is where I attempt to enclude the other areas that were returned by the  queryTask
 for (j = 0; j < featholding.length; j++){
                 newExtent = esri.graphicsExtent(featholding.features);             }
             }

map.setExtent(newExtent.expand(1.1),true);

however it appears that the map.setExtent is being set to the last piece of geometry in the array. Is there are way to have the map include all the extents being passed in instead of the last one.

Also I tried

  newExtent=esri.graphicsExtent(resultFeatures);
            map.setExtent(newExtent, true);

but the map was not doing any focusing at all.

derekswingley1

You're on the right track. Instead of looping through all your features and unioning their extents, pass all your features to esri.graphicsExtent. Then set the map's extent, something like...

var newExtent = esri.graphicsExtent(resultFeatures);
map.setExtent(newExtent, true);

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