topic Re: Is not a constructor - seatgeeksearch tutorial in ArcGIS JavaScript Maps SDK Questions

Is not a constructor - seatgeeksearch tutorial

thomasenns1 — Thu, 03 Oct 2013 03:52:46 GMT

I'm upgrading my code to amd and educating myself with the Seatgeeksearch tutorial. I've done this, now, on a couple different machines and I get an error - "Seatgeeksearch is not a constructor". Any help or direction would be greatly appreciated. I seems at though seatgeeksearch.js seems to load okay.

Re: Is not a constructor - seatgeeksearch tutorial

derekswingley1 — Thu, 03 Oct 2013 11:14:32 GMT

Please post your code that shows the problem. The example using the code from that tutorial works without issue: http://servicesbeta.esri.com/demos/using-classes-with-javascript/seatgeek-search/

Re: Is not a constructor - seatgeeksearch tutorial

WillHughes1 — Wed, 09 Sep 2015 07:59:48 GMT

define(

["dojo/_base/declare", "dojo/_base/lang", "esri/request"],

function (declare, lang, esriRequest) {

declare(null,

{

distance: null,

lastSearchResult: null,

perPage: null,

queryParams: null,

seatGeekUrl: null,

constructor: function (options) {

// specify class defaults

this.distance = options.distance || "20mi"; // default seat geek range is 30mi

this.perPage = options.perPageage || 50; // default to 50 results per page

this.seatGeekUrl = "http://api.seatgeek.com/2/events";

// returnEvents is called by an external function, esri.request

// hitch() is used to provide the proper context so that returnEvents

// will have access to the instance of this class

this.returnEvents = lang.hitch(this, this.returnEvents);

searchByLoc: function (geopoint) {

var eventsResponse;

this.queryParams = {

"lat": geopoint.y,

"lon": geopoint.x,

"page": 1,

"per_page": this.perPage,

"range": this.distance

}

// seat geek endpoints:

// petco park search using lat, lon:

// http://api.seatgeek.com/2/events?lat=32.7078&lon=-117.157&range=20mi&callback=c

// lat, lon for petco park: 32.7078, -117.157

eventsResponse = esriRequest({

"url": this.seatGeekUrl,

"callbackParamName": "callback",

"content": this.queryParams

});

return eventsResponse.then(this.returnEvents, this.err);

getMore: function() {

var eventsResponse;

// increment the page number

this.queryParams.page++;

eventsResponse = esri.request({

"url": this.seatGeekUrl,

"callbackParamName": "callback",

"content": this.queryParams

});

return eventsResponse.then(this.returnEvents, this.err);

returnEvents: function(response) {

// check number of results

if ( response.meta.total == 0) {

// console.log("Seat Geek returned zero events: ", response);

return null;

}

// save search result

this.lastSearchResult = response;

// console.log("set last search result: ", response, this);

return response;

err: function(err) {

console.log("Failed to get results from Seat Geek due to an error: ", err);

}

});

Re: Is not a constructor - seatgeeksearch tutorial

WillHughes1 — Wed, 09 Sep 2015 08:09:46 GMT

I was able to get this to work by adding "return" before declare on line 4.

define(

["dojo/_base/declare", "dojo/_base/lang", "esri/request"],

function (declare, lang, esriRequest) {

return declare(null,

Without return I was seeing the same "not a constructor" error mentioned in the original post.

It would be great if the Tutorial files were made available in the Samples or on GitHub. Thanks.