Assistance / issues with custom stream trace widget creation

01-27-2020 07:18 AM
New Contributor III

Hello GeoNet and widget gurus! Let me fully disclose that I'm not a developer nor anything close to it... but I'm trying to accomplish something that I think is fairly straightforward for someone with basic JS and widget development experience and needless to say I'm stuck with the following after adding my best attempt to our Portal dev web app:

Uncaught TypeError: Cannot read property 'name' of undefined
at Object.<anonymous> (Widget.js?wab_dv=2.15:68)
at Object.<anonymous> (init.js:64)
at Object.c [as onwidget-created] (init.js:120)
at Function.m.emit (init.js:126)
at Function.m.emit (init.js:127)
at Object.emit (init.js:119)
at Object.<anonymous> (WidgetManager.js?wab_dv=2.15:132)
at init.js:64

Long story short, we have an internal environmental sciences web application running on Portal that I extend and support here and there using WABD 2.15. I'm trying to build a simple widget, that when opened, prompts a user to select a location / point on the map. Once the click event occurs, I simply want to reach out to the USGS streamer API located here: USGS - Streamer Trace API 

Ideally, I'd like to configure my widget.html to simply prompt the user to select the point on the map and select up stream trace or down stream trace, and then for the widget.js file to contain the JS logic to run the operation using their provided code in the link above. 

Is there a simple way to transform the USGS example code below to a actionable widget in a WABD app? I've given it a shot but I'm sure there are multiple errors in my widget.js syntax as is currently. Here is the full html that I used as a starting point:

<!-- HTML HEAD -->
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Streamer Trace API: Sample #10</title>

<!-- ESRI JSAPI 3.14 -->
<link rel="stylesheet" href="">
<script type="text/javascript" src=""></script>

<!-- Streamer Trace JSAPI 3.14 -->
<script type="text/javascript" src=""></script>

<!-- css styling -->
<style type="text/css">
html, body, #map {
height: 100%;
width: 100%;
margin: 0px;
padding: 0px;
overflow: hidden;
#HomeButton {
position: absolute;
left: 20px;
top: 90px;
#description, #controls {
position: absolute;
background: rgba(255,255,255,0.8);
border: 1px solid black;
border-radius: 5px;
padding: 10px;
font-family: Arial, Helvetica, sans-serif;
z-index: 99;
#description {
right: 20px;
top: 20px;
#controls {
left: 70px;
top: 20px;

<!-- main JavaScript -->
<script type="text/javascript">
require( ["esri/map","esri/dijit/HomeButton","dojo/domReady!"], function(Map,HomeButton) {
// create map
// since we'll add a trace_api basemap, set the map LevelsOfDetail (zoom levels) to the API basemapLODs
var map = new Map("map", {
"center" : [-99,38],
"zoom" : 1,
"lods" : trace_api.basemapLODs,
"showAttribution" : false,
"logo" : false

// add "home" navigation button (zooms to initial extent when clicked)
( new HomeButton( {"map":map}, "HomeButton") ).startup();

// connect Trace API "trace-complete" event handler
trace_api.on( "trace-complete", function() {
// give an alert if addTrace failed
if ( trace_api.lastAddTraceFailure() ) {
// there is a failure message - give alert
alert( "trace_api.on 'trace-complete': Trace could not be added to map.\nReason:\n\n" + trace_api.lastAddTraceFailure() + "\n\n" );

// add trace_api basemap, USA mask, and set map on-click callback when the trace_api is loaded
trace_api.on("load", function() {
// add the Trace API "imagery" basemap
"map" : map, // map to use
"basemap" : "imagery", // ESRI "World Imagery" basemap with Streamer's traceable streams & labels
"opacity" : 0.9 // opacity (0-1, 1=100% opaque)

// add gray mask of the United States
"map" : map, // map to use
"visible" : true, // toggle visible
"opacity" : 0.7 // opacity (0-1, 1=100% opaque)

// set map on-click callback
map.on("click", function(evt) {
// get trace direction currently selected in drop-down menu
var traceDir = document.getElementById("menu_traceDir");
traceDir = traceDir.options[traceDir.selectedIndex].text;

// add trace using the trace_api.addTrace() method with desired options
"map" : map, // map to use
// ...parameters defining the stream trace to add...
"x" : evt.mapPoint.x, // set trace origin x-coord to the map click
"y" : evt.mapPoint.y, // set trace origin y-coord to the map click
"xy_wkid" : evt.mapPoint.spatialReference.wkid, // map-click coord spatial reference wkid
"traceDir" : traceDir, // direction of stream trace (must be "up" or "down")
// ...additional trace options...
"originPoint" : "infoHover", // add point graphic to trace origin with mouse-hover info window
"clearOldTraces" : true // clear any existing map traces before trying to add the new one
}); // end map.on "click"
}); // end trace_api.on "load"

}); // end require

<!-- HTML BODY -->
<!-- description -->
<div id="description">
<b>SAMPLE 10:</b> Adding a trace by clicking the map

<!-- controls -->
<div id="controls">
<b>(1)</b> Choose a trace direction:
<select id="menu_traceDir" >
<option>up </option>
<b>(2)</b> Click a stream on the map to start a trace

<!-- map -->
<div id="map"></div>

<!-- home button -->
<div id="HomeButton"></div>


Thanks for any assistance you can provide! Robert Scheitlin, GISP

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