OK, I got it working. Now I need to take it further. I need to step through all circles and build a composite list of all nearby features. The output needs to include both some of the attributes of the the input (objectid, name) followed by all the features in the comparison layer that are within it's buffer.
What I came up with seems right, but since I have multiple features now, not one,it seems like it needs to be changed to something with a deferred. It doesn't seem to execute in the right sequence.
Here's the sequence:
Select a county name from a pick list. Use that name to run a query task against the input layer. The result is selected points
//zooms to county selected in the dropdown list
function zoomCounty () {
findTask = new FindTask((countyLayer.url));
findParams = new FindParameters();
findParams.returnGeometry = true;
findParams.layerIds = [0];
findParams.searchFields = ["COUNTYNAME"]; //Fields are CASE SENSITIVE
findParams.outSpatialReference = spatialReference;
var countyName = registry.byId("countySelect").value;//Set the search text to the value selected in the list
// var countyName = "Boone";
currentCounty = countyName;
if (countyName.length > 1){
findParams.searchText = countyName;
/*
findTask.execute(findParams, function (results) {
map.setExtent(results[0].feature.geometry.getExtent().expand(1.5));
});
*/
updateLcarsGrid();
}else{
console.log('no county selected');
}
}These are placed into a formatted grid
//Populates a list of LCARS for that county
function updateLcarsGrid(){
var queryParams = new Query();
queryParams.geometry = currentExtent;
queryParams.spatialRelationship = Query.SPATIAL_REL_CONTAINS;
queryParams.outFields = ["*"];
queryParams.outSpatialReference = spatialReference;
queryParams.returnGeometry = true;
queryParams.where = "County = '" + currentCounty + "'";
var queryTask = new QueryTask(lcarsLayer.url);
queryTask.on ('error', queryErrorHandler);
queryTask.execute(queryParams, updateLGridHandler);
}
function queryErrorHandler(err) {
console.log ("error in queryTask is " + err.error);
}
function updateLGridHandler(results){
domClass.remove("dataDiv", "dataDivBlank");
domClass.add("dataDiv", "dataDivOpen");
// dom.byId("messages").innerHTML = "";
var data = [];
if (lgrid) {
lgrid.refresh();
}
if (results.features.length > 0) {
data = arrayUtils.map(results.features, function(feature){
return {
'id': feature.attributes.OBJECTID,
'facility_type': feature.attributes.Facility_Type,
'regulatory_type': feature.attributes.Regulatory_Type,
'facility': feature.attributes.Provider_Name,
'address': feature.attributes.Address,
'city': feature.attributes.City
};
});
lgrid = new Grid({
renderRow: renderRowFunction,
showHeader: false
}, "lcarsGridDiv");
lgrid.renderArray(data);
lgrid.sort('facility');
lgrid.on('.dgrid-row:click', function(evt){
gridClick = true;
var row = lgrid.row(evt);
var rowid = [row.data.id];
gridAddr = row.data.address;
gridClickHandler(rowid);
});
generateBufferGraphic(results.features);
var compArray = selectAllInBuffer();
console.log("end of selectAllInBuffer");
}else {
var countyName = registry.byId("countySelect").value;//Set the search text to the value selected in the list
// var countyName = "Boone";
if (countyName.length > 1) {
findParams.searchText = countyName;
findTask.execute(findParams, function(results){
map.setExtent(results[0].feature.geometry.getExtent().expand(1.5));
});
alert("No LCARS in this county. Select another from the list.");
}
}
}There is a pick list of distances. This is input for generating circle buffers, which go into a graphicsLayer.
//create a buffer graphic for every LCARS
function generateBufferGraphic(features){
bufferLayer.clear();
var radius = registry.byId("bufferSelect").value;
var idPoint,circle;
compareSel.length = 0;
//added ts 12/30
var query = new Query();
query.returnGeometry = true;
arrayUtils.forEach(features, function (feature){
idPoint = feature.geometry;
circle = new Circle({
center: idPoint,
geodesic: true,
radius: radius,
radiusUnit: "esriMiles"
});
var graphic = new Graphic(circle, bufferSymbol,feature.attributes);
graphic.attributes.Source = 'LCARS';
bufferLayer.add(graphic);
});
//Added "if" so the zoom wouldn't happen if the buffer alone changes.
if (justBuffer == false) {
var ext = graphicsUtils.graphicsExtent(bufferLayer.graphics).expand(2);
map.setExtent(ext);
}
justBuffer = false;
}Then these graphics are used one at a time as the geometry for a comparison layer using a selectFeatures. The output from that selection might be zero, or multiple. This seems to be where I'm failing. With breakpoints, I can see there are features within an individual circle. By the time I finish all the looping, I always end up with zero!
function selectAllInBuffer(){
lcarsLayer.clearSelection();
compareLayer.clearSelection();
compareSel.length = 0;
// var graphics = bufferLayer.graphics;
compareLayer.on('selection-complete',function (results){
var len = results.features.length;
if (len > 0) {
arrayUtils.forEach(results.features, function(feature){
compareSel.push({"lcars":lcarsProv,"results":feature.attributes});
console.log("compareSel length = " + compareSel.length);
});
}else{
console.log(" no nearby facilities");
}
});
arrayUtils.forEach(bufferLayer.graphics, function (graphic){
query.geometry = graphic.geometry;
graphic_oid = graphic.attributes.OBJECTID;
lcarsProv = graphic.attributes;
compareLayer.selectFeatures(query);
});
return compareSel;
}This is sensitive data, or I'd post a link. I'm hampered by a broken wrist, so I'm not quite up to making a jsfiddle. Hopefully someone will spot something. There are no errors generated from this code, I'm just not getting the results I expect.
