ArcGIS Coding Components
Use this skill when embedding an Arcade expression editor into a web application. The @arcgis/coding-components package provides the arcgis-arcade-editor web component - a full-featured code editor for writing, testing, and debugging Arcade expressions. This is a new component package in 5.0 with no 4.x equivalent.
Import Patterns
CDN (No Build Tools)
<!-- Load ArcGIS Maps SDK -->
<script src="https://js.arcgis.com/5.0/"></script>
<!-- Load Coding Components -->
<script
type="module"
src="https://js.arcgis.com/5.0/coding-components/"
></script>
Direct ESM Imports (Build Tools)
import "@arcgis/coding-components/components/arcgis-arcade-editor";
arcgis-arcade-editor Component
A rich code editor for Arcade expressions with syntax highlighting, diagnostics, code suggestions, and a documentation side panel.
Properties
| Property | Attribute | Type | Default | Description |
|---|
script | script | string | "" | The Arcade script content (read/write) |
profile | - | IEditorProfileDefinition | - | Profile metadata defining the editing context (set via JS) |
testData | - | IEditorTestContext | - | Test data context for expression validation (set via JS) |
snippets | - | ApiSnippet[] | - | Collection of code snippets to show in the snippets panel (set via JS) |
suggestions | - | IEditorCodeSuggestion[] | - | Code suggestions shown to the user (set via JS) |
editorOptions | - | IEditorOptions & IGlobalEditorOptions | - | Monaco-style editor options (set via JS) |
hideSideBar | hide-side-bar | boolean | false | Hide the side action bar for a minimal UI |
hideDocumentationActions | - | boolean | false | Hide the documentation action in the side panel |
openedSidePanel | opened-side-panel | string | "none" | Name of the currently opened side panel |
sideActionBarExpanded | side-action-bar-expanded | boolean | false | Whether the side action bar is expanded |
Methods
| Method | Returns | Description |
|---|
setFocus() | void | Set focus on the editor |
componentOnReady() | Promise<void> | Resolves when the component is fully loaded |
Events
| Event | Detail | Description |
|---|
arcgisScriptChange | string | Fired when the script content changes (debounced) |
arcgisDiagnosticsChange | Diagnostic[] | Fired when diagnostics (errors/warnings) change |
Basic Usage
Minimal Editor
<arcgis-arcade-editor
script="return $feature.Population * 2;"
style="width: 600px; height: 400px;"
>
</arcgis-arcade-editor>
Listening for Script Changes
<arcgis-arcade-editor id="editor" style="width: 600px; height: 400px;">
</arcgis-arcade-editor>
<script type="module">
const editor = document.querySelector("#editor");
editor.script = "return $feature.Name;";
editor.addEventListener("arcgisScriptChange", (event) => {
const newScript = event.detail;
console.log("Script updated:", newScript);
});
editor.addEventListener("arcgisDiagnosticsChange", (event) => {
const diagnostics = event.detail;
const errors = diagnostics.filter((d) => d.severity === "error");
if (errors.length > 0) {
console.warn("Script has errors:", errors);
}
});
</script>
Editor with Profile Context
const editor = document.querySelector("arcgis-arcade-editor");
// Define the editing profile - tells the editor what variables are available
editor.profile = {
id: "popup",
title: "Popup Expression",
description: "Expression for popup content",
variables: [
{
name: "$feature",
type: "Feature",
description: "The current feature",
},
{
name: "$layer",
type: "FeatureSet",
description: "The feature's parent layer",
},
],
};
Editor with Test Data
const editor = document.querySelector("arcgis-arcade-editor");
// Provide test data for expression validation
editor.testData = {
spatialReference: { wkid: 4326 },
features: [
{
attributes: {
Name: "Test Feature",
Population: 50000,
Area: 125.5,
},
geometry: {
type: "point",
x: -118.24,
y: 34.05,
},
},
],
fields: [
{ name: "Name", type: "esriFieldTypeString", alias: "Name" },
{ name: "Population", type: "esriFieldTypeInteger", alias: "Population" },
{ name: "Area", type: "esriFieldTypeDouble", alias: "Area" },
],
};
Editor with Custom Snippets
const editor = document.querySelector("arcgis-arcade-editor");
editor.snippets = [
{
name: "Format Currency",
description: "Format a number as US currency",
code: 'Text($feature.Value, "$#,###.00")',
},
{
name: "Concatenate Fields",
description: "Join two text fields with a separator",
code: 'Concatenate([$feature.FirstName, $feature.LastName], " ")',
},
];
Minimal Editor (No Side Bar)
<arcgis-arcade-editor
hide-side-bar
script="return Round($feature.Value, 2);"
style="width: 400px; height: 200px;"
>
</arcgis-arcade-editor>
Full Example with Map Integration
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Arcade Editor</title>
<script src="https://js.arcgis.com/5.0/"></script>
<script
type="module"
src="https://js.arcgis.com/5.0/coding-components/"
></script>
<script
type="module"
src="https://js.arcgis.com/5.0/map-components/"
></script>
<style>
html,
body {
height: 100%;
margin: 0;
display: flex;
flex-direction: column;
}
arcgis-map {
flex: 1;
}
#editor-panel {
height: 300px;
border-top: 1px solid #ccc;
}
</style>
</head>
<body>
<arcgis-map id="map" item-id="YOUR_WEBMAP_ID">
<arcgis-zoom slot="top-left"></arcgis-zoom>
</arcgis-map>
<div id="editor-panel">
<arcgis-arcade-editor id="editor"></arcgis-arcade-editor>
</div>
<script type="module">
const mapElement = document.querySelector("#map");
const editor = document.querySelector("#editor");
await mapElement.viewOnReady();
const view = mapElement.view;
const layer = view.map.layers.getItemAt(0);
await layer.load();
// Set initial script
editor.script = 'return $feature.Name + " (" + $feature.Type + ")"';
// Configure profile from layer fields
editor.profile = {
id: "popup",
title: "Popup Expression",
variables: [
{ name: "$feature", type: "Feature", description: "Current feature" },
],
};
// Listen for changes and apply to popup
editor.addEventListener("arcgisScriptChange", (event) => {
console.log("Expression:", event.detail);
});
</script>
</body>
</html>
Common Pitfalls
- Missing coding-components script: The
arcgis-arcade-editor element must be loaded separately from the core SDK. <!-- Anti-pattern: only loading core SDK --> <script src="https://js.arcgis.com/5.0/"></script> <arcgis-arcade-editor></arcgis-arcade-editor> <!-- Correct: load coding-components too --> <script src="https://js.arcgis.com/5.0/"></script> <script type="module" src="https://js.arcgis.com/5.0/coding-components/" ></script> <arcgis-arcade-editor></arcgis-arcade-editor> Impact: The element is unrecognized and renders as empty. - No size on the editor: The editor needs explicit width and height to render.
<!-- Anti-pattern: no size --> <arcgis-arcade-editor></arcgis-arcade-editor> <!-- Correct: explicit size --> <arcgis-arcade-editor style="width: 600px; height: 400px;" ></arcgis-arcade-editor> Impact: The editor renders with zero height and is invisible. - Setting
profile or testData as HTML attributes: These properties accept complex objects and must be set via JavaScript. Impact: Values are silently ignored; the editor lacks context for autocompletion and validation. - Not debouncing
arcgisScriptChange: The event fires on every keystroke (debounced internally but can still be frequent). Avoid expensive operations in the handler. // Anti-pattern: expensive operation on every change editor.addEventListener("arcgisScriptChange", async (event) => {await compileAndExecuteArcade(event.detail); // too frequent}); // Correct: add your own debounce for expensive operations let timeout; editor.addEventListener("arcgisScriptChange", (event) => {clearTimeout(timeout); timeout = setTimeout(() => {compileAndExecuteArcade(event.detail);}, 500);}); Impact: UI freezes or excessive server requests during typing.
Reference Samples
- Search for Arcade-related samples that demonstrate expression editing workflows.
Related Skills
- See
arcgis-arcade for Arcade expression language syntax and usage patterns. - See
arcgis-widgets-ui for layout components to host the editor panel. - See
arcgis-popup-templates for using Arcade expressions in popup content. - See
arcgis-visualization for Arcade-driven visual variables and renderers.
