ArcGIS API for JS 4.15: highlight polygons in query results, websocket connection error
by
Me again,
I'm building a web app based on the example code here: https://developers.arcgis.com/javascript/latest/sample-code/sandbox/index.html?sample=tasks-query. I've made some modifications, such as dynamically-populating the drop down list and using a 2D map with polygons, but nothing else major.
I have two questions:
(1) In the example code, the query results are highlighted when clicked. This doesn't happen in my version. Is it due to a difference in polygon features vs. the 3D symbols? How can I modify this to implement highlighted features? My final application will have multiple results returned from queries, so I think it will be confusing if I can't get this to work.
I can see from this example that highlighting polygons is possible: https://developers.arcgis.com/javascript/latest/sample-code/sandbox/index.html?sample=featurelayervi.... However, I can't quite figure out what I need to pull from this code.
(2) In the browser console, I also notice I am receiving the following errors:
It seems to be related to the feature service I'm using, but I'm not sure why this is occurring as the features are appearing and functioning within the app.
Any assistance you can give to this JavaScript kindergartener would be much appreciated. Thank you!
<html>
<head>
<meta charset="utf-8" />
<meta
name="viewport"
content="initial-scale=1,maximum-scale=1,user-scalable=no"/>
<title>Project viewer</title>
<style>
html,
body,
#mainViewDiv {
padding: 0;
margin: 0;
height: 100%;
overflow: hidden;
}
h2 {
color: black;
font-family: "Noto Sans", sans-serif;
padding-bottom: 3px;
}
p {
color: black;
font-family: "Noto Sans", sans-serif;
line-height: 2;
margin: 0;
padding: 0;
}
#results {
padding-top: 5px;
}
#optionsDiv {
background-color: white;
color: white;
padding: 10px;
width: 100%;
-webkit-box-shadow: 3px 2px 15px -2px rgba(0,0,0,0.67);
-moz-box-shadow: 3px 2px 15px -2px rgba(0,0,0,0.67);
box-shadow: 3px 2px 15px -2px rgba(0,0,0,0.67);
opacity: 0.90;
}
#drop-downs {
padding-bottom: 15px;
}
widget {
/* Fill in later to style drop down widget */
}
#logo-img {
width: 100%;
height: auto;
}
#loading-img {
width: 20%;
height: auto;
}
#printResults {
font-family: "Noto Sans", sans-serif;
font-style: italic;
font-size: 12px;
color: black;
}
#doBtn {
box-shadow: inset 0px 0px 0px 0px #9fb4f2;
background-color: #1a1b1f;
border: 0px solid #4e6096;
display: inline-block;
cursor: pointer;
color: #ffffff;
padding: 6px 12px;
text-decoration: none;
border: 0px;
outline: none;
transition: all 0.3s ease 0s;
}
#doBtn:hover {
background-color: #494b51;
outline: none;
}
#doBtn:active {
position: relative;
top: 1px;
border: 0px;
outline: none;
}
.visible {
display: block !important;
}
.loading{
position: absolute;
top: 50%;
left: 40%;
margin-right: -40%;
display: none;
}
.widget {
border-radius:4px;
border:1px solid #AAAAAA;
}
</style>
<link
rel="stylesheet"
href="https://js.arcgis.com/4.15/esri/themes/light/main.css"
/>
<script src="https://js.arcgis.com/4.15/"></script>
<script>
require([
"esri/Map",
"esri/views/MapView",
"dojo/dom-class",
"esri/core/watchUtils",
"esri/Basemap",
"esri/widgets/LayerList",
"esri/layers/FeatureLayer",
"esri/PopupTemplate",
"esri/layers/GraphicsLayer",
"esri/tasks/QueryTask",
"esri/tasks/support/Query",
"esri/widgets/Home",
"esri/widgets/LayerList",
"esri/widgets/Expand",
"dojo/domReady!"
], function(
Map,
MapView,
domClass,
watchUtils,
Basemap,
LayerList,
FeatureLayer,
PopupTemplate,
GraphicsLayer,
QueryTask,
Query,
Home,
LayerList,
Expand
){
var basinUrl = "https://services.arcgis.com/v01gqwM5QqNysAAi/arcgis/rest/services/Chesapeake_Bay_major_watersheds_feature/FeatureServer/0";
//* Define the popup content for each result
var popupTemplate = {
title: "{MajBas}",
content:
"Test text"
};
// Layer - project footprints
const basinLayer = new FeatureLayer({
url: basinUrl,
outFields: ["*"],
visible: true,
popupTemplate: popupTemplate,
title: "Basins"
});
// Layer - dark nav basemap
const basemap = Basemap.fromId("streets-night-vector");
//** Point querytask to project boundary URL
var qTask = new QueryTask({
url: basinUrl
});
//** Set the query parameters to always return geometry and all fields.
//** Returning geometry allows us to display results on the map/view
var params = new Query({
returnGeometry: true,
outFields: ["*"]
});
//* GraphicsLayer for displaying results
var resultsLayer = new GraphicsLayer({
listMode: "hide"
});
var map = new Map({
basemap : basemap,
layers: [basinLayer, resultsLayer]
});
var mainView = new MapView({
container: "mainViewDiv",
map: map,
popup: {
highlightEnabled: false,
dockEnabled: true,
dockOptions: {
breakpoint: false,
position: "top-right"
}
},
center: [-75.325395, 40.306275],
zoom: 5
});
// turn loading icon on/off when view is busy
mainView.watch('updating', function(evt){
if(evt === true){
domClass.add('loadingDiv', 'visible');
}else{
domClass.remove('loadingDiv', 'visible');
}
})
// create layerlist widget
var layerList = new LayerList({
view: mainView
});
// create expand widget
layerListExpand = new Expand({
expandIconClass: "esri-icon-layer-list",
expandTooltip: layerList.label,
view: mainView,
content: layerList,
expanded: false,
group: "top-left"
});
// create home widget
var homeWidget = new Home({
view: mainView
});
// add widget with drop-down options
mainView.ui.add("optionsDiv", {
position: "bottom-left",
index: 0
});
// add home widget
mainView.ui.add(homeWidget, {
position: "top-left",
index: 0
});
// add expand widget containing layerlist
mainView.ui.add([layerListExpand], "top-left");
//* for drop down
var basinTypeSelect = document.getElementById("valSelect");
//* query all features from the basin layer
mainView
.when(function () {
return basinLayer.when(function () {
var query = basinLayer.createQuery();
return basinLayer.queryFeatures(query);
document.getElementById("doBtn").addEventListener("click", doQuery);
});
})
.then(getValues)
.then(getUniqueValues)
.then(addToSelect)
//* return an array of all the values in the
//* basin name field
function getValues(response) {
var features = response.features;
var values = features.map(function (feature) {
return feature.attributes.MajBas;
});
return values;
}
//* return an array of unique values in
//* the MajBas field of the basin layer
function getUniqueValues(values) {
var uniqueValues = [];
values.forEach(function (item, i) {
if (
(uniqueValues.length < 1 || uniqueValues.indexOf(item) === -1) &&
item !== ""
) {
uniqueValues.push(item);
}
});
return uniqueValues;
}
//* Add the unique values to the basin type
//* select element. This will allow the user
//* to filter basin by name.
function addToSelect(values) {
values.sort();
values.forEach(function (value) {
var option = document.createElement("option");
option.text = value;
basinTypeSelect.add(option);
});
}
//** Call doQuery() each time the button is clicked
mainView.when(function () {
mainView.ui.add("optionsDiv", "bottom-left");
document.getElementById("doBtn").addEventListener("click", doQuery);
});
// relate to drop-down menu select field ID
var attributeName = document.getElementById("MajBas");
// Executes each time the button is clicked
function doQuery() {
// Clear the results from a previous query
resultsLayer.removeAll();
// Build new query
params.where =
"MajBas LIKE" + "'" + basinTypeSelect.value + "'";
// turn off the featurelayer so only queried results visible
basinLayer.visible = false;
// executes query and calls getResults() once promise is resolved
// promiseRejected() is called if the promise is rejected
qTask.execute(params).then(getResults).catch(promiseRejected);
}
// Called each time the promise is resolved
function getResults(response) {
// Loop through each results and assign a symbol and PopupTemplate
var basinResults = response.features.map(function (feature) {
// Sets the symbol of each resulting feature
feature.symbol = {
type: "simple-fill",
color: [212, 161, 87, 0.25],
outline: { // autocasts as new SimpleLineSymbol()
color: [128, 128, 128, 0.5],
width: "0.5px"
}
};
feature.popupTemplate = popupTemplate;
return feature;
});
resultsLayer.addMany(basinResults);
// animate to the results after they are added to the map
mainView
.goTo(basinResults)
.then(function () {
mainView.popup.open({
features: basinResults,
featureMenuOpen: true,
updateLocationEnabled: true
});
})
.catch(function (error) {
if (error.name != "AbortError") {
console.error(error);
}
});
// print the number of results returned to the user
document.getElementById("printResults").innerHTML =
basinResults.length + " result(s) found";
}
// Called each time the promise is rejected
function promiseRejected(error) {
console.error("Promise rejected: ", error.message);
}
});
</script>
</head>
<body>
<div id="mainViewDiv"></div>
<div id="loadingDiv" align="center" class="loading">
<img src="https://i.stack.imgur.com/qq8AE.gif" id="loading-img"/>
</div>
<div id="optionsDiv">
<h2>Example Viewer</h2>
<div id="drop-downs">
<p><b>Basin</b></p>
<select id="valSelect" class="widget"></select>
</div>
<div align="center"><button id="doBtn">Search</button></div>
<div align="center">
<p id="results"><span id="printResults"></span></p>
</div>
</div>
</body>
</html>
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