Re: Error when executing a query

EdwardSohn2 — Sun, 30 Nov 2014 20:15:17 GMT

The requires are:

"esri/tasks/QueryTask",

"esri/tasks/query",

...

Query,

EsriQuery,

So the Query is actually QueryTask and EsriQuery is actually Query.

The issue seems to happen because normally the layer comes in as part of the map layers from ArcGisOnline. Currently the code removes the layer from the map using removeLayer and wraps the original layer in the ClusterLayer implementation (downloaded from samples) and sets the clusterlayer's Id to the removed layer's Id then adds it to the map using addLayer. The above query occurs on the _refresh event for the cluster layer.

When I don't remove the original layer and keep both layers on the map (and adjust the clusterlayer Id to something different for this) then the error doesn't happen. However when the original layer is removed, the error occurs. The thing is this only happens for some of the feature layers, i.e. when I replace it with the clustered layer implementation, and not for some of the other feature layers.

Here is the code for the ClusterLayer implementation. (Changed the require to use QueryTask and EsriQuery instead.)

define([

"dojo/_base/declare",

"dojo/_base/array",

"esri/Color",

"dojo/_base/connect",

"esri/SpatialReference",

"esri/geometry/Point",

"esri/graphic",

"esri/symbols/SimpleMarkerSymbol",

"esri/symbols/TextSymbol",

"esri/dijit/PopupTemplate",

"esri/layers/GraphicsLayer",

"dojo/_base/lang",

"esri/tasks/QueryTask",

"esri/tasks/query"

], function (

declare, arrayUtils, Color, connect,

SpatialReference, Point, Graphic, SimpleMarkerSymbol, TextSymbol,

PopupTemplate, GraphicsLayer, lang, QueryTask, EsriQuery

) {

return declare([GraphicsLayer], {

constructor: function (options) {

// options:

// data: Object[]

// Array of objects. Required. Object are required to have properties named x, y and attributes. The x and y coordinates have to be numbers that represent a points coordinates.

// distance: Number?

// Optional. The max number of pixels between points to group points in the same cluster. Default value is 50.

// labelColor: String?

// Optional. Hex string or array of rgba values used as the color for cluster labels. Default value is #fff (white).

// labelOffset: String?

// Optional. Number of pixels to shift a cluster label vertically. Defaults to -5 to align labels with circle symbols. Does not work in IE.

// resolution: Number

// Required. Width of a pixel in map coordinates. Example of how to calculate:

// map.extent.getWidth() / map.width

// showSingles: Boolean?

// Optional. Whether or graphics should be displayed when a cluster graphic is clicked. Default is true.

// singleSymbol: MarkerSymbol?

// Marker Symbol (picture or simple). Optional. Symbol to use for graphics that represent single points. Default is a small gray SimpleMarkerSymbol.

// singleTemplate: PopupTemplate?

// PopupTemplate</a>. Optional. Popup template used to format attributes for graphics that represent single points. Default shows all attributes as "attribute = value" (not recommended).

// maxSingles: Number?

// Optional. Threshold for whether or not to show graphics for points in a cluster. Default is 1000.

// webmap: Boolean?

// Optional. Whether or not the map is from an ArcGIS.com webmap. Default is false.

// spatialReference: SpatialReference?

// Optional. Spatial reference for all graphics in the layer. This has to match the spatial reference of the map. Default is 102100. Omit this if the map uses basemaps in web mercator.

this._clusterTolerance = options.distance || 50;

this._clusterData = options.data || [];

this._clusters = [];

this._clusterLabelColor = options.labelColor || "#000";

// labelOffset can be zero so handle it differently

this._clusterLabelOffset = (options.hasOwnProperty("labelOffset")) ? options.labelOffset : -5;

// graphics that represent a single point

this._singles = []; // populated when a graphic is clicked

this._showSingles = options.hasOwnProperty("showSingles") ? options.showSingles : true;

// symbol for single graphics

var SMS = SimpleMarkerSymbol;

this._singleSym = options.singleSymbol || new SMS("circle", 6, null, new Color("#888"));

this._singleTemplate = options.singleTemplate || new PopupTemplate({ "title": "", "description": "{*}" });

this._maxSingles = options.maxSingles || 1000;

this._webmap = options.hasOwnProperty("webmap") ? options.webmap : false;

//hack: should probably base it off the map

this._sr = options.spatialReference || new SpatialReference({ "wkid": 102100 });

//this._extentChange = null;

this._layer = options.layer;

this._queryTask = new QueryTask(this._layer.url);

this._esriQuery = new EsriQuery();

this._chunk = options.chunk;

refresh: function () {

if (this._layer.visible)

this._refresh();

else

this.clear();

_refresh: function () {

if (!this._layer.visible)

return;

this._queryData();

_queryData: function () {

this._esriQuery.returnGeometry = true;

this._esriQuery.outFields = this._layer._outFields;

this._esriQuery.geometry = this._layer._map.extent;

if (this._layer.getDefinitionExpression())

this._esriQuery.where = this._layer.getDefinitionExpression();

else

this._esriQuery.where = "1=1";

this._queryTask.execute(this._esriQuery, lang.hitch(this, function (featureSet) {

var inputInfo = {};

inputInfo.data = dojo.map(featureSet.features, function (feature) {

var pointX = feature.geometry.x;

var pointY = feature.geometry.y;

var att = feature.attributes;

return {

"x": pointX,

"y": pointY,

"attributes": att

};

});

this._clusterData.length = 0;

this._clusterData = inputInfo.data;

// update resolution

this._clusterResolution = this._map.extent.getWidth() / this._map.width;

this.clear();

this._clusterGraphics();

}));

// override esri/layers/GraphicsLayer methods

_setMap: function (map, surface) {

// calculate and set the initial resolution

this._clusterResolution = map.extent.getWidth() / map.width; // probably a bad default...

this._layer._map = map;

this._layer._map.on("click", lang.hitch(this, function (e) {

if (this._layer._map.infoWindow.isShowing)

this._layer._map.infoWindow.hide();

}));

// GraphicsLayer will add its own listener here

var div = this.inherited(arguments);

return div;

_unsetMap: function () {

this.inherited(arguments);

//connect.disconnect(this._extentChange);

// public ClusterLayer methods

add: function (p) {

// Summary: The argument is a data point to be added to an existing cluster. If the data point falls within an existing cluster, it is added to that cluster and the cluster's label is updated. If the new point does not fall within an existing cluster, a new cluster is created.

// if passed a graphic, use the GraphicsLayer's add method

if (p.declaredClass) {

this.inherited(arguments);

return;

}

// add the new data to _clusterData so that it's included in clusters

// when the map level changes

this._clusterData.push(p);

var clustered = false;

// look for an existing cluster for the new point

for (var i = 0; i < this._clusters.length; i++) {

var c = this._clusters;

if (this._clusterTest(p, c)) {

// add the point to an existing cluster

this._clusterAddPoint(p, c);

// update the cluster's geometry

this._updateClusterGeometry(c);

// update the label

this._updateLabel(c);

clustered = true;

break;

}

if (!clustered) {

this._clusterCreate(p);

p.attributes.clusterCount = 1;

this._showCluster(p);

}

clear: function () {

// Summary: Remove all clusters and data points.

this.inherited(arguments);

this._clusters.length = 0;

clearSingles: function (singles) {

// Summary: Remove graphics that represent individual data points.

var s = singles || this._singles;

arrayUtils.forEach(s, function (g) {

this.remove(g);

}, this);

this._singles.length = 0;

onClick: function (e) {

// remove any previously showing single features

this.clearSingles(this._singles);

// find single graphics that make up the cluster that was clicked

// would be nice to use filter but performance tanks with large arrays in IE

var singles = [];

for (var i = 0, il = this._clusterData.length; i < il; i++) {

if (e.graphic.attributes.clusterId == this._clusterData.attributes.clusterId) {

singles.push(this._clusterData);

}

if (singles.length > this._maxSingles) {

alert("Sorry, that cluster contains more than " + this._maxSingles + " points. Zoom in for more detail.");

return;

} else {

// stop the click from bubbling to the map

e.stopPropagation();

//this._map.infoWindow.show(e.graphic.geometry);

this._addSingles(singles, e.graphic.geometry);

this._map.infoWindow.show(e.graphic.geometry);

}

// internal methods

_clusterGraphics: function () {

// first time through, loop through the points

for (var j = 0, jl = this._clusterData.length; j < jl; j++) {

// see if the current feature should be added to a cluster

var point = this._clusterData;

var clustered = false;

var numClusters = this._clusters.length;

for (var i = 0; i < this._clusters.length; i++) {

var c = this._clusters;

if (this._clusterTest(point, c)) {

this._clusterAddPoint(point, c);

clustered = true;

break;

}

if (!clustered) {

this._clusterCreate(point);

}

this._showAllClusters();

_clusterTest: function (p, cluster) {

var distance = (

Math.sqrt(

Math.pow((cluster.x - p.x), 2) + Math.pow((cluster.y - p.y), 2)

) / this._clusterResolution

);

return (distance <= this._clusterTolerance);

// points passed to clusterAddPoint should be included

// in an existing cluster

// also give the point an attribute called clusterId

// that corresponds to its cluster

_clusterAddPoint: function (p, cluster) {

// average in the new point to the cluster geometry

var count, x, y;

count = cluster.attributes.clusterCount;

x = (p.x + (cluster.x * count)) / (count + 1);

y = (p.y + (cluster.y * count)) / (count + 1);

cluster.x = x;

cluster.y = y;

// build an extent that includes all points in a cluster

// extents are for debug/testing only...not used by the layer

if (p.x < cluster.attributes.extent[0]) {

cluster.attributes.extent[0] = p.x;

} else if (p.x > cluster.attributes.extent[2]) {

cluster.attributes.extent[2] = p.x;

}

if (p.y < cluster.attributes.extent[1]) {

cluster.attributes.extent[1] = p.y;

} else if (p.y > cluster.attributes.extent[3]) {

cluster.attributes.extent[3] = p.y;

}

// increment the count

cluster.attributes.clusterCount++;

// attributes might not exist

if (!p.hasOwnProperty("attributes")) {

p.attributes = {};

}

// give the graphic a cluster id

p.attributes.clusterId = cluster.attributes.clusterId;

// point passed to clusterCreate isn't within the

// clustering distance specified for the layer so

// create a new cluster for it

_clusterCreate: function (p) {

var clusterId = this._clusters.length + 1;

// console.log("cluster create, id is: ", clusterId);

// p.attributes might be undefined

if (!p.attributes) {

p.attributes = {};

}

p.attributes.clusterId = clusterId;

// create the cluster

var cluster = {

"x": p.x,

"y": p.y,

"attributes": {

"clusterCount": 1,

"clusterId": clusterId,

"extent": [p.x, p.y, p.x, p.y]

}

};

this._clusters.push(cluster);

_showAllClusters: function () {

for (var i = 0, il = this._clusters.length; i < il; i++) {

var c = this._clusters;

this._showCluster(c);

}

_showCluster: function (c) {

var point = new Point(c.x, c.y, this._sr);

this.add(

new Graphic(

point,

null,

c.attributes

)

);

// code below is used to not label clusters with a single point

if (c.attributes.clusterCount == 1) {

return;

}

// show number of points in the cluster

var label = new TextSymbol(c.attributes.clusterCount)

.setColor(new Color(this._clusterLabelColor))

.setOffset(0, this._clusterLabelOffset);

this.add(

new Graphic(

point,

label,

c.attributes

)

);

_addSingles: function (singles, c) {

// add single graphics to the map

arrayUtils.forEach(singles, function (p) {

var g = new Graphic(

this._showSingles ? new Point(p.x, p.y, this._sr) : new Point(c.x, c.y, this._sr),

this._singleSym,

p.attributes,

this._singleTemplate

);

this._singles.push(g);

if (this._showSingles) {

this.add(g);

}

}, this);

this._map.infoWindow.setFeatures(this._singles);

_updateClusterGeometry: function (c) {

// find the cluster graphic

var cg = arrayUtils.filter(this.graphics, function (g) {

return !g.symbol &&

g.attributes.clusterId == c.attributes.clusterId;

});

if (cg.length == 1) {

cg[0].geometry.update(c.x, c.y);

} else {

console.log("didn't find exactly one cluster geometry to update: ", cg);

}

_updateLabel: function (c) {

// find the existing label

var label = arrayUtils.filter(this.graphics, function (g) {

return g.symbol &&

g.symbol.declaredClass == "esri.symbol.TextSymbol" &&

g.attributes.clusterId == c.attributes.clusterId;

});

if (label.length == 1) {

// console.log("update label...found: ", label);

this.remove(label[0]);

var newLabel = new TextSymbol(c.attributes.clusterCount)

.setColor(new Color(this._clusterLabelColor))

.setOffset(0, this._clusterLabelOffset);

this.add(

new Graphic(

new Point(c.x, c.y, this._sr),

newLabel,

c.attributes

)

);

// console.log("updated the label");

} else {

console.log("didn't find exactly one label: ", label);

}

// debug only...never called by the layer

_clusterMeta: function () {

// print total number of features

console.log("Total: ", this._clusterData.length);

// add up counts and print it

var count = 0;

arrayUtils.forEach(this._clusters, function (c) {

count += c.attributes.clusterCount;

});

console.log("In clusters: ", count);

}

});

//calling above

var clusterLayer = new ClusterLayer({

"data": [],

"distance": 100,

"id": "clusters",

"labelColor": "#fff",

"labelOffset": 10,

"singleColor": "#888",

"layer": layer.layerObject,

"id": layer.id,

"labelOffset": -5,

"singleSymbol": layer.layerObject.renderer.symbol,

"showSingles": false,

"maxSingles": 10000,

"singleTemplate": layer.layerObject.infoTemplate,

"chunk": 1000

});

var defaultSym = new esri.symbol.SimpleMarkerSymbol().setSize(4);

var renderer = new esri.renderer.ClassBreaksRenderer(defaultSym, "clusterCount");

var blue = new esri.symbol.PictureMarkerSymbol("../images/cluster_icons/BluePin1LargeB.png", 32, 32).setOffset(0, 0); //15

var green = new esri.symbol.PictureMarkerSymbol("../images/cluster_icons/GreenPin1LargeB.png", 64, 64).setOffset(0, 0);

var red = new esri.symbol.PictureMarkerSymbol("../images/cluster_icons/RedPin1LargeB.png", 72, 72).setOffset(0, 0);

renderer.addBreak(1, 1, layer.layerObject.renderer.symbol);

renderer.addBreak(2, 10, blue);

renderer.addBreak(10, 200, green);

renderer.addBreak(200, 10000, red);

clusterLayer.setRenderer(renderer);

clusterLayer.title = layer.title;

clusterLayer._layer.setVisibility(layer.visibility);

this.parentContext.map.removeLayer(layer.layerObject);

this.parentContext.map.addLayer(clusterLayer);

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