javascript-react-plugin.md

title	description	services	ms.workload	ms.tgt_pltfrm	ms.topic	ms.date
React plugin for Application Insights JavaScript SDK	How to install and use React plugin for Application Insights JavaScript SDK.	azure-monitor	tbd	ibiza	conceptual	07/28/2020

React plugin for Application Insights JavaScript SDK

React plugin for the Application Insights JavaScript SDK, enables:

• Tracking of route changes
• React components usage statistics

Getting started

Install npm package:

npm install @microsoft/applicationinsights-react-js
npm install @microsoft/applicationinsights-web

Basic usage

Initialize a connection to Application Insights:

// AppInsights.js
import { ApplicationInsights } from '@microsoft/applicationinsights-web';
import { ReactPlugin } from '@microsoft/applicationinsights-react-js';
import { createBrowserHistory } from 'history';

const browserHistory = createBrowserHistory({ basename: '' });
const reactPlugin = new ReactPlugin();
const appInsights = new ApplicationInsights({
    config: {
        instrumentationKey: 'YOUR_INSTRUMENTATION_KEY_GOES_HERE',
        extensions: [reactPlugin],
        extensionConfig: {
          [reactPlugin.identifier]: { history: browserHistory }
        }
    }
});
appInsights.loadAppInsights();
export { reactPlugin, appInsights };

Wrap your component with the higher-order component function to enable Application Insights on it:

import React from 'react';
import { withAITracking } from '@microsoft/applicationinsights-react-js';
import { reactPlugin, appInsights } from './AppInsights';

// To instrument various React components usage tracking, apply the `withAITracking` higher-order
// component function.

class MyComponent extends React.Component {
    ...
}

// withAITracking takes 4 parameters ( reactPlugin, Component, ComponentName, className) 
// the first two are required and the other two are optional.

export default withAITracking(reactPlugin, MyComponent);

Configuration

Name	Default	Description
history	null	React router history. For more information, see the react-router package documentation. To learn how to access the history object outside of components, see the React-router FAQ

React components usage tracking

To instrument various React components usage tracking, apply the withAITracking higher-order component function.

It will measure time from the ComponentDidMount event through the ComponentWillUnmount event. However, in order to make this more accurate, it will subtract the time in which the user was idle React Component Engaged Time = ComponentWillUnmount timestamp - ComponentDidMount timestamp - idle time.

To see this metric in the Azure portal you need to navigate to the Application Insights resource, select the "Metrics" tab and configure the empty charts to display custom metric name "React Component Engaged Time (seconds)", select aggregation (sum, avg, etc.) of your metric and apply split be "Component Name".

You can also run custom queries to divide Application Insights data to generate report and visualizations as per your requirements. In the Azure portal navigate to the Application Insights resource, select "Analytics" from the top menu of the Overview tab and run your query.

Note

It can take up to 10 minutes for new custom metrics to appear in the Azure Portal.

Using React Hooks

React Hooks are an approach to state and life-cycle management in a React application without relying on class-based React components. The Application Insights React plugin provides a number of Hooks integrations that operate in a similar way to the higher-order component approach.

Using React Context

The React Hooks for Application Insights are designed to use React Context as a containing aspect for it. To use Context, initialize Application Insights as above, and then import the Context object:

import React from "react";
import { AppInsightsContext } from "@microsoft/applicationinsights-react-js";
import { reactPlugin } from "./AppInsights";

const App = () => {
    return (
        <AppInsightsContext.Provider value={reactPlugin}>
            /* your application here */
        </AppInsightsContext.Provider>
    );
};

This Context Provider will make Application Insights available as a useContext Hook within all children components of it.

import React from "react";
import { useAppInsightsContext } from "@microsoft/applicationinsights-react-js";

const MyComponent = () => {
    const appInsights = useAppInsightsContext();
    
    appInsights.trackMetric("Component 'MyComponent' is in use");
    
    return (
        <h1>My Component</h1>
    );
}
export default MyComponent;

useTrackMetric

The useTrackMetric Hook replicates the functionality of the withAITracking higher-order component, without adding an additional component to the component structure. The Hook takes two arguments, first is the Application Insights instance (which can be obtained from the useAppInsightsContext Hook), and an identifier for the component for tracking (such as its name).

import React from "react";
import { useAppInsightsContext, useTrackMetric } from "@microsoft/applicationinsights-react-js";

const MyComponent = () => {
    const appInsights = useAppInsightsContext();
    const trackComponent = useTrackMetric(appInsights, "MyComponent");
    
    return (
        <h1 onHover={trackComponent} onClick={trackComponent}>My Component</h1>
    );
}
export default MyComponent;

It will operate like the higher-order component, but respond to Hooks life-cycle events, rather than a component life-cycle. The Hook needs to be explicitly provided to user events if there is a need to run on particular interactions.

useTrackEvent

The useTrackEvent Hook is used to track any custom event that an application may need to track, such as a button click or other API call. It takes four arguments:

• Application Insights instance (which can be obtained from the useAppInsightsContext Hook).
• Name for the event.
• Event data object that encapsulates the changes that has to be tracked.
• skipFirstRun (optional) flag to skip calling the trackEvent call on initialization. Default value is set to true.

import React, { useState, useEffect } from "react";
import { useAppInsightsContext, useTrackEvent } from "@microsoft/applicationinsights-react-js";

const MyComponent = () => {
    const appInsights = useAppInsightsContext();
    const [cart, setCart] = useState([]);
    const trackCheckout = useTrackEvent(appInsights, "Checkout", cart);
    const trackCartUpdate = useTrackEvent(appInsights, "Cart Updated", cart);
    useEffect(() => {
        trackCartUpdate({ cartCount: cart.length });
    }, [cart]);
    
    const performCheckout = () => {
        trackCheckout();
        // submit data
    };
    
    return (
        <div>
            <ul>
                <li>Product 1 <button onClick={() => setCart([...cart, "Product 1"])}>Add to Cart</button></li>
                <li>Product 2 <button onClick={() => setCart([...cart, "Product 2"])}>Add to Cart</button></li>
                <li>Product 3 <button onClick={() => setCart([...cart, "Product 3"])}>Add to Cart</button></li>
                <li>Product 4 <button onClick={() => setCart([...cart, "Product 4"])}>Add to Cart</button></li>
            </ul>
            <button onClick={performCheckout}>Checkout</button>
        </div>
    );
}

export default MyComponent;

When the Hook is used, a data payload can be provided to it to add additional data to the event when it is stored in Application Insights.

React Error Boundaries

Error Boundaries provide a way to gracefully handle an exception when it occurs within a React application, and when such error occurs it's likely that the exception needs to be logged. The React Plugin for Application Insights provides an Error Boundary component that will automatically log the error when it occurs.

import React from "react";
import { reactPlugin } from "./AppInsights";
import { AppInsightsErrorBoundary } from "@microsoft/applicationinsights-react-js";

const App = () => {
    return (
        <AppInsightsErrorBoundary onError={() => <h1>I believe something went wrong</h1>} appInsights={reactPlugin}>
            /* app here */
        </AppInsightsErrorBoundary>
    );
};

The AppInsightsErrorBoundary requires two props to be passed to it, the ReactPlugin instance created for the application and a component to be rendered when an error occurs. When an unhandled error occurs, trackException is called with the information provided to the Error Boundary and the onError component is displayed.

Sample app

Check out the Application Insights React demo.

Next steps

• To learn more about the JavaScript SDK, see the Application Insights JavaScript SDK documentation.
• To learn about the Kusto query language and querying data in Log Analytics, see the Log query overview.