react-amplitude-hooks


A React component library for easy product analytics instrumentation.

Improvement from the @amplitude/react-amplitude library

This library is designed to be fully API compatible with the @amplitude/react-amplitude library, but taking advantage of the modern React features of hooks and context API.

- Hook support const { instrument, logEvent } = useAmplitude();
- TypeScript support

Example: Instrumenting Tic-Tac-Toe (From Facebook's Intro to React Tutorial)

This is a hooks re-write of the example for demonstration purposes.

Events logged:
- start game
- game won
- click square
- jump to move
- go to game start

Event properties:
- scope (array; "square", "history", "game")
- moves made (number)
- winner ("X" or "O")
- current player ("X" or "O")

``jsx
import React from "react";
import { render } from "react-dom";
import amplitude from "amplitude-js";
import {
AmplitudeProvider,
Amplitude,
LogOnMount,
useAmplitude
} from "react-amplitude-hooks";
import "./style.css";

const AMPLITUDE_KEY = "737df6b28171adb201918442e02407ac";

/**
* Events:
* - start game
* - game won
* - click square
* - jump to move
* - go to game start
*
* Event properties:
* - scope (array; "square", "history", "game")
* - moves made (number)
* - winner ("X" or "O")
* - current player ("X" or "O")
*/

function Square(props) {
const { instrument } = useAmplitude(inheritedProps => ({
...inheritedProps,
scope: [...inheritedProps.scope, "square"]
}));

return (
className="square"
onClick={instrument("click square", props.onClick)}
>
{props.value}

);
}

function BoardSquare(props) {
return (
value={props.value}
onClick={() => props.onClick(props.index)}
/>
);
}

function Board(props) {
return (


);
}

function Game() {
const [history, setHistory] = React.useState([{ squares: Array(9).fill(null) }]);
const [stepNumber, setStepNumber] = React.useState(0);

const xIsNext = stepNumber % 2 === 0;

function handleClick(i) {
const h = history.slice(0, stepNumber + 1);
const current = h[history.length - 1];
const squares = current.squares.slice();
if (calculateWinner(squares) || squares[i]) {
return;
}

squares[i] = xIsNext ? "X" : "O";

setHistory(
h.concat([
{
squares: squares
}
])
);

setStepNumber(history.length);
}

function jumpTo(step) {
setStepNumber(step);
}

const current = history[stepNumber];
const winner = calculateWinner(current.squares);

const moves = history.map((step, move) => {
const desc = move ? "Go to move #" + move : "Go to game start";
return (

eventProperties={inheritedProps => ({
...inheritedProps,
scope: [...inheritedProps.scope, "move button"]
})}
>
{({ logEvent }) => (
onClick={() => {
logEvent(move ? "jump to move" : "go to game start");
jumpTo(move);
}}
>
{desc}

)}

);
});

let status;
if (winner) {
status = "Winner: " + winner;
} else {
status = "Current player: " + (xIsNext ? "X" : "O");
}

return (
amplitudeInstance={amplitude.getInstance()}
apiKey={AMPLITUDE_KEY}
>
eventProperties={{
scope: ["game"],
"moves made": stepNumber,
"current player": xIsNext ? "X" : "O",
winner
}}
>

{!!winner && }

squares={current.squares}
onClick={i => handleClick(i)}
/>

eventProperties={inheritedProps => ({
...inheritedProps,
scope: [...inheritedProps.scope, "history"]
})}
>

{status}

{moves}

);
}

// ========================================

render(, document.getElementById("root"));

function calculateWinner(squares) {
const lines = [
[0, 1, 2],
[3, 4, 5],
[6, 7, 8],
[0, 3, 6],
[1, 4, 7],
[2, 5, 8],
[0, 4, 8],
[2, 4, 6]
];
for (let i = 0; i < lines.length; i++) {
const [a, b, c] = lines[i];
if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
return squares[a];
}
}
return null;
}
`

Installation

With npm:

`
npm install --save react-amplitude-hooks
`

With yarn:

`
yarn add react-amplitude-hooks
`

react-amplitude-hooks does not come with its own copy of the Amplitude JavaScript SDK. You can either install the Amplitude SDK via npm or with a JavaScript snippet.

API Documentation

$3

| Argument | Description |
| --------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| eventProperties | If an object is provided, the object will be merged with event properties higher-up in the component hierarchy and included in all events logged in this component or any components in its subtree.
If a function is provided, it will be called with a single parameter, inheritedProperties, that contains all of the event properties from components higher in the React component hierarchy. The return value from this function will be used for all logged events in this component or other components in its subtree. |
| instanceName | The Amplitude instance to log events to. |




$3

Note: You must have an in your React tree for logging to occur.


| Name | Description |
| ----------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| amplitudeInstance | A required prop. You should be providing an Amplitude instance returned from the Amplitude JS SDK's getInstance method. |
| apiKey | An optional prop that can be used to initialize the Amplitude instance with the provided key. |
| userId | An optional prop that can be used to attribute all events to a specific user. |

$3

| Name | Description |
| ---------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| children | If can pass a function as the children prop, it will be called with a single object parameter, and the return value of that function will be used for rendering the actual React subtree. |
| eventProperties | If an object is provided, the object will be merged with event properties higher-up in the component hierarchy and included in all events logged in this component or any components in its subtree.
If a function is provided, it will be called with a single parameter, inheritedProperties, that contains all of the event properties from components higher in the React component hierarchy. The return value from this function will be used for all logged events in this component or other components in its subtree. |
| debounceInterval | If provided, events logged by the component will be debounced by this amount, in milliseconds. |
| userProperties | An optional object that if provided, will trigger updates to the current user's "user properties." |

#### Examples

The single object parameter has two useful fields: logEvent and instrument.

logEvent is a function that can be used to imperatively log events. All event properties from this component's eventProperties prop and any inherited properties will be included in these events.

Example:

`jsx
function Button(props) {
return (

{({ logEvent }) =>
onClick={() => {
logEvent('button click');
props.onClick();
}}
>
{props.children}

}

)
}
`

instrument is a function that can be used to declaratively log events. If you have pre-existing event handlers, just wrap the functions with an instrument, and events will fire every time your normal event handlers are executed. instrument takes two parameters, the event type and the function to proxy.

instrument is also useful if you would like to prevent re-rendering via shouldComponentUpdate optimizations like PureComponent. It memoizes its arguments and returns the same function instance across re-renders. For this reason, it's not recommended to use instrument for functions that change on every render (i.e. inlined or "arrow" functions in render).

Example:

`jsx
function Button(props) {
return (

{({ instrument }) =>
onClick={instrument('button click', props.onClick)}
>
{props.children}

}

)
}
`




$3

| Name | Description |
| --------------- | ----------------------------------------------------------------------------------- |
| eventType | When this component mounts, it will log an event with this value as the event type. |
| eventProperties | These properties will be applied to the event when the component mounts. |
| instanceName | The Amplitude instance to log events to. |

$3

| Name | Description |
| --------------- | --------------------------------------------------------------------------------------------------- |
| value | Required prop, that when changes (diffing is done with shallow equality comparison), logs an event. |
| eventType | When the value` prop changes, it will log an event with this value as the event type. |
| eventProperties | These properties will be applied to the event when the component mounts. |
| instanceName | The Amplitude instance to log events to. |

License

MIT

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