I am working on a js application that uses ArcGIS JS (currently targeting 3.8, referencing through the arcgis cdn). We have found an issue during internal testing where when the app loads and the dojo require/define chain resolves, periodically the app will fail to load with "multipleDefine" errors being thrown from dojoLoader in esri init.js. We have a single computer running IE 10 that can easily replicate the error in one or two loads of the page. Testing on another computer running IE 10 did not provide a replication of the issue. I have tested on IE 11 as well and was able to replicate a few times over many loads of the app. This hasn't been enough to go on to track down the cause.
We have a number of custom modules setup with the standard "define" structure. It appears that when one of these modules loads, a group of the references in the define block fail with the multipleDefine errors. As an example, there is a custom module that handles the setup and use of a BasemapGallery. In the case of this module, the errors may occur when loading 'esri/dijit/BasemapGallery', 'esri/dijit/BasemapLayer', 'esri/dijit/Basemap', among others. These 3 references in particular are only made within this single module in our entire app.
Any thoughts about what could be causing this issue?
Thanks
define([
'dojo/_base/declare',
'dijit/_WidgetBase',
'dijit/_TemplatedMixin',
'dijit/_WidgetsInTemplateMixin',
'dojo/_base/lang',
'dijit/form/DropDownButton',
'dijit/DropDownMenu',
'dijit/MenuItem',
'dojo/_base/array',
'dojox/lang/functional',
'dojo/text!./Basemaps/templates/Basemaps.html',
'esri/dijit/BasemapGallery',
'esri/dijit/BasemapLayer',
'esri/dijit/Basemap',
'dijit/registry',
'esri/layers/ArcGISTiledMapServiceLayer'
], function (declare, _WidgetBase, _TemplatedMixin, _WidgetsInTemplateMixin, lang, DropDownButton, DropDownMenu, MenuItem, array, functional, template, BasemapGallery, BasemapLayer, Basemap, registry, ArcGISTiledMapServiceLayer) {
//anonymous function to load CSS files required for this module
(function () {
var css = [require.toUrl("gis/dijit/Basemaps/css/Basemaps.css")];
var head = document.getElementsByTagName("head").item(0),
link;
for (var i = 0, il = css.length; i < il; i++) {
link = document.createElement("link");
link.type = "text/css";
link.rel = "stylesheet";
link.href = css[i].toString();
head.appendChild(link);
}
} ());
var customBasemaps = {
//SNIP
};
var agolBasemaps = {
//SNIP
};
// main basemap widget
return declare([_WidgetBase, _TemplatedMixin, _WidgetsInTemplateMixin], {
templateString: template,
widgetsInTemplate: true,
mode: "agol",
title: "Basemaps",
mapStartBasemap: "hybrid",
basemapsToShow: ["hybrid", "satellite", "streets", "topo", "gray", "oceans", "national-geographic", "osm"],
validBasemaps: [],
postCreate: function () {
//SNIP
},
startup: function () {
this.inherited(arguments);
if (this.mode === "custom") {
this.gallery.select(this.mapStartBasemap);
} else {
this.map.setBasemap(this.mapStartBasemap);
}
}
});
});
