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ArcGIS JSAPI Hack - Getting around the 1000 results limit for queries
/** globals define */
define([
"dojo/_base/declare",
"dojo/Deferred",
"esri/tasks/query",
"esri/tasks/QueryTask",
"esri/request"
], function (
declare, Deferred, Query, QueryTask, esriRequest
) {
return declare([QueryTask], {
constructor: function (url) {
this.inherited(arguments);
esriRequest({
url: url,
handleAs: "json",
content: {f: "json"}
}).then(function (response) {
var i, il = response.fields.length;
for (i = 0; i < il; i++) {
if (response.fields[i].type === "esriFieldTypeOID") {
this.set("oidFieldName", response.fields[i].name);
break;
}
}
}.bind(this));
},
/* Used to search for features that return large amounts of data.
* @method bigExecute
* @param {esri/tasks/query} params - query parameters
* @returns {dojo/Deferred} - a deferred object promising a FeatureSet
*/
bigExecute: function (params) {
var queryCopy = new Query(), q;
for (q in params) {
if (params.hasOwnProperty(q)) {
if (q === "outFields") {
queryCopy.outFields = [this.oidFieldName];
} else {
queryCopy[q] = params[q];
}
}
}
return this.executeForIds(queryCopy).then(function (oids) {
return this._getAllSearchResults(params, oids, 0);
});
},
_getAllSearchResults: function (query, oidList, startIndex, prevResults, def) {
var iMax = Math.min(startIndex + 1000, oidList.length);
var objectIds = oidList.slice(startIndex, iMax);
def = def || new Deferred();
query.objectIds = objectIds;
this.execute(query).then(
function (featureSet) {
// load featureSet if done.
if (prevResults === undefined) {
prevResults = featureSet;
} else {
prevResults.features = prevResults.features.concat(featureSet.features);
}
// if not all results have been collected...
if (iMax < oidList.length) {
// request the next batch of results
this._getAllSearchResults(query, oidList, iMax, prevResults, def);
} else {
// all results accounted for.
def.resolve(prevResults);
}
}.bind(this)
);
return def;
}
}
});
});
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