Charts components with Map components

Learn how to use Charts Components and Map Components using Vite developer build tools.

In this tutorial, you will:

Render a webmap with Map Components and a chart (scatterplot) with Charts Components.
Add the action bar component to the chart, and explore different functionality such as filter by extent and sync up the selection between the chart and the map.

Prerequisites

The most recent LTS Node.js runtime environment.
A text editor to edit files.
A terminal to enter commands.

Steps

Create a new project using Vite

Download the initial Vite vanilla Javascript project to your local machine.
Unzip the downloaded file.
Open the unzipped folder's files in your text editor.
Navigate to the unzipped folder in your terminal.

Install dependencies

Install Charts Components and Map Components in the terminal window as a dependency.
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```
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npm install @arcgis/charts-components @arcgis/map-components
```
Later in this tutorial we will need to know which version of @esri/calcite-components was installed as a dependency of @arcgis/map-components, run this command in the terminal window to find the correct version.
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```
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npm list @esri/calcite-components
```
Start the Vite development server.
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```
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npm run dev
```
Open a web browser and navigate to http://localhost:5173. Initially, this web page will be empty, but it will update as we proceed through the remaining steps.

Import functions to define the custom HTML elements from the Charts Components, Map Components and Calcite Components libraries in main.js. You will need to use an alias, because the imported function from each library has the same name, defineCustomElements.

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import { defineCustomElements as defineCalciteElements } from '@esri/calcite-components/dist/loader';
import { defineCustomElements as defineChartsElements } from '@arcgis/charts-components/dist/loader';
import { defineCustomElements as defineMapElements } from '@arcgis/map-components/dist/loader';

Define the custom elements on the window using the Calcite Components distribution build. You will use CDN-hosted assets. When using the CDN-hosted assets, you need to keep the version number in the path the same as the version of @esri/calcite-components found in step two.
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```
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defineCalciteElements(window, { resourcesUrl: 'https://js.arcgis.com/calcite-components/2.11.1/assets' });
```

Next, use the Charts Components and Map Components distribution build to define and lazy load the custom charts elements.

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defineMapElements(window, { resourcesUrl: 'https://js.arcgis.com/map-components/4.30/assets' });
defineChartsElements(window, { resourcesUrl: 'https://js.arcgis.com/charts-components/4.30/t9n' });

Add styles

In style.css, import the @arcgis/core light theme.

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@import 'https://js.arcgis.com/4.30/@arcgis/core/assets/esri/themes/light/main.css';

Add CSS styles to the scatterplot in style.css. This will position the chart component directly on top of the map component.

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html,
body {
    padding: 0;
    margin: 0;
    height: 100%;
    width: 100%;
}

#scatterplot {
    position: absolute;
    bottom: 100px;
    left: 30px;
    height: 40%;
    width: 50%;
}

Import the CSS file in main.js.
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```
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import './style.css';
```

Add components

Add the arcgis-map component to index.html under <body>.
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```
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 <arcgis-map item-id="2c7d98b24ed64da0985666d937c85196"></arcgis-map>
```
Add the arcgis-charts-scatter-plot component to index.html under <body>.
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```
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<arcgis-charts-scatter-plot id="scatterplot"></arcgis-charts-scatter-plot>
```

Add the arcgis-charts-action-bar component to be slotted inside the scatterplot component.

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<arcgis-charts-scatter-plot id="scatterplot">
    <arcgis-charts-action-bar slot="action-bar"></arcgis-charts-action-bar>
</arcgis-charts-scatter-plot>

Create a reference to components

In main.js, create a reference to the arcgis-map, arcgis-charts-scatter-plot and arcgis-charts-action-bar components.

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const mapElement = document.querySelector('arcgis-map');
const scatterplotElement = document.querySelector('arcgis-charts-scatter-plot');
const actionBarElement = document.querySelector('arcgis-charts-action-bar');

Load the scatterplot

In main.js, add an event listener arcgisViewReadyChange to the mapElement.

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mapElement.addEventListener('arcgisViewReadyChange', (event) => {
  // to be implemented
});

Inside the event listener, get the map and view from the event target.
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```
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const { map, view } = event.target;
```

Get the CollegeScorecard_Charts layer from the map and the first chart's config from the layer.

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const featureLayer = map.layers.find((layer) => layer.title === 'CollegeScorecard_Charts');
const scatterplotConfig = featureLayer.charts[0];

Assign the layer and set config to the scatterplot element.

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scatterplotElement.config = scatterplotConfig;
scatterplotElement.layer = featureLayer;

Show selected features from the chart on the map

In the arcgisViewReadyChange event listener, get the layer views from the view.
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```
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const featureLayerViews = view.layerViews;
```

Add an event listener to the scatterplot element. When the arcgisChartsSelectionComplete event is fired, remove the previous selection and highlight the currently selected features on the map.

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scatterplotElement.addEventListener('arcgisChartsSelectionComplete', (event) => {
    map.highlightSelect?.remove();
    map.highlightSelect = featureLayerViews.items[0].highlight(event.detail.selectionOIDs);
});

Add functionality to filter by extent

In the arcgisViewReadyChange event listener's callback function, add the arcgisChartsDefaultActionSelect event listener to the actionBarElement.
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```
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actionBarElement.addEventListener('arcgisChartsDefaultActionSelect', (event) => {
    // to be implemented
});
```
In the arcgisChartsDefaultActionSelect event listener's callback function, get the actionId and actionActive properties from the event detail.
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```
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const { actionId, actionActive } = event.detail;
```

Set the view of the scatterplot element to the map view if the Filter By Extent action is toggled on.

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if (actionId === 'filterByExtent') {
  if (mapElement.view !== undefined) {
    scatterplotElement.view = actionActive ? mapElement.view : undefined;
  }
}

Show selected features from the map on the chart

Outside of the arcgisViewReadyChange event listener, add a second event listener to the mapElement: arcgisViewClick.
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```
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mapElement.addEventListener('arcgisViewClick', (event) => {
    // to be implemented
});
```
In the arcgisViewClick event listener's callback, get the view from the event target.
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```
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const { view } = event.target;
```

Get the screen points from the event detail.

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let screenPoints = event.detail.screenPoint;
view.hitTest(screenPoints).then(getFeatures);

Lastly, get the features from the hit test. With in the function, get the selected feature's OID (in this case, the attribute is ObjectId) and assign it to the scatterplot element's selection data.

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function getFeatures(response) {
    const selectedFeatureOID = response.results[0].graphic.attributes['ObjectId'];

    scatterplotElement.selectionData = {
        selectionOIDs: [selectedFeatureOID],
    };
}

Run the application

The app should display the scatterplot on top of the map. When you select some features on the chart, the corresponding features should also be selected on the map.