React V3.1.X

Introduction

SDK overview

🚧

Flagship React SDK only works with React hooks

Our React SDK only works with react hooks, if you want to use without it, you should use our Javascript SDK

Welcome to the Flagship ReactJS SDK documentation!

The following documentation helps you to run Flagship on your ReactJS environment (client-side or server-side).

Flagship ReactJS SDK provides a <FlagshipProvider />, which makes Flagship features available to the rest of your app.
Flagship features are accessible using Flagship hooks, have a look at the documentation for details.

Feel free to contact us if you have any questions regarding this documentation.

SDK features

This SDK version helps you:

• Set a visitor ID
• Update visitor context
• Assign campaigns via the Decision API or via the Bucketing
• Get Flags
• Manage visitor consent
• Activate campaigns
• Send hits to our Universal Collect
• Manage visitor cache

Prerequisites

• Node.js: version 6.0.0 or later
• Npm: version 5.2.0 or later
• React: version 16.8.0 or later (the SDK only supports hooks for now)

Good to know

• Github repository
• Gzipped size: ~24.1 kB
• Typescript code supported

Getting started

Initialization

There are four steps to follow to get started with the React Flagship SDK.

1. Install the node module

npm install @flagship.io/react-sdk

2. Import the Flagship React provider

In most cases, do this in your App.js file to wrap your entire app with the provider.

import React from "react";
import { FlagshipProvider } from "@flagship.io/react-sdk";

const App = () => (
  <>
    <FlagshipProvider>{/* [...] */}</FlagshipProvider>
  </>
);

3. Initialize the provider

You must at least include the required props like envId, apiKey, visitorData.

import React from "react";
import { FlagshipProvider } from "@flagship.io/react-sdk";

const App = () => (
  <>
    <FlagshipProvider
      envId="YOUR_ENV_ID"
      apiKey="YOUR_API_KEY"
      visitorData={{
        id: "YOUR_VISITOR_ID",
        context: {
          key:"value"
        },
        isAuthenticated: false
      }}
    >
      {/* ... */}
    </FlagshipProvider>
  </>
);

4. Use a Flagship hook in a component

In most case, you will get the desired flags.

import React from "react";
import { useFsFlag } from "@flagship.io/react-sdk";

export const MyReactComponent = () => {
  const flagBackgroundColor = useFsFlag("backgroundColor","green")
  return (
    <div
      style={{
        height: "200px",
        width: "200px",
        backgroundColor: flagBackgroundColor.getValue(),
      }}
    >
      {"I'm a square with color=" + flagBackgroundColor.getValue()}
    </div>
  );
};

API Reference

FlagshipProvider

Here is the full list of props available to use inside the FlagshipProvider React component:

📘

When bucketing is running (decisionMode="BUCKETING"), the polling will restart its interval period based on the moment when one of the following props changes after first rendering :

• envId
• apiKey
• decisionMode

📘

Any change of props visitorData will fetch flags automatically.

On SDK initialization, if the props visitorData is null, no visitor will be initialized until set

visitorData

The visitorData object takes the following arguments:

Decision Mode

DECISION-API Mode (by default)

When the SDK is running in API mode, the campaign assignments and targeting validation will be run through our Decision API. In this mode, each time a new Decision is required, it will create an HTTPS request to the API.
This mode is used by default for all our SDK.

Bucketing Mode

When the SDK is running in Bucketing mode, the SDK downloads all the campaigns configurations at once in a single bucketing file so that variation assignment can be computed client-side by the SDK. This bucketing file is stored in cache and will only be downloaded again when campaign configurations are modified in the Flagship interface. Learn more

DecisionMode is an enum defined decision type

onUpdate

The onUpdate object has one argument with the following shape:

status object shape:

onBucketingSuccess

The onBucketingSuccess function has one argument with the following shape:

onBucketingFail

The onBucketingFail function has one argument

onBucketingUpdated

The onBucketingUpdated function has one argument

statusChangedCallback

The statusChangedCallback function has one argument

onUserExposure deprecated

The onUserExposure function has one argument with the following shape:

UserExposureType shape

type UserExposureInfo = {
  flagData: {
    key: string
    value: unknown
    metadata: IFlagMetadata
  },
  visitorData: {
    visitorId: string
    anonymousId: string|null
    context: Record<string, string|number|boolean>
  }
 }

OnVisitorExposed

In some cases, you'll need to send information about the exposure (When a flag has been seen by your visitor), like sending visitor and flag data to third parties.

To centralize it, we provide a callback in the configuration option of the SDK.

The OnVisitorExposed function has one argument with the following shape:

OnVisitorExposed shape

type OnVisitorExposed ={
    exposedVisitor: {
      id: string
      anonymousId?:string|null
      context: Record<string, string|number|boolean>
  },
    fromFlag: {
      key: string
      value: unknown
      defaultValue: unknown
      metadata: IFlagMetadata
  }
}

exposedVisitor object shape

fromFlag object shape

Here is an example on how to use this callback:

Example with Mixpanel integration
Example with Segment integration

Learn more about getting flags

onLog

The onLog function has 3 arguments

Usage :

import React from "react";
import { FlagshipProvider, LogLevel } from "@flagship.io/react-sdk";

const App = () => (
  <>
    <FlagshipProvider
      envId="YOUR_ENV_ID"
      apiKey="YOUR_API_KEY"
      visitorData={{
        id: "YOUR_VISITOR_ID",
        context: {
          // some context
        },
        isAuthenticated: false,
      }}
      onLog={(level, tag, message) => {
        console.log(`[${LogLevel[level]}] [${tag}] : ${message}`);
      }}
    >
      {/* [...] */}
    </FlagshipProvider>
  </>
);

FlagshipStatus

FlagshipStatus is an enum defining the different status of Flagship SDK

Flag data shape:

type FlagDTO= {
  key: string;
  campaignId: string;
  variationGroupId: string;
  variationId: string;
  isReference?: boolean;
  campaignType?: string;
  slug?:string|null;
  value: any;
}

LogLevel

LogLevel is an enum defined the level of log to receive

IFlagshipLogManager

The aims of this Interface is to define methods that an object must have in order to receive Flagship SDK logs

interface IFlagshipLogManager {
  emergency(message: string, tag: string): void;
  alert(message: string, tag: string): void;
  critical(message: string, tag: string): void;
  error(message: string, tag: string): void;
  warning(message: string, tag: string): void;
  notice(message: string, tag: string): void;
  info(message: string, tag: string): void;
  debug(message: string, tag: string): void;
  log(level: LogLevel, message: string, tag: string): void;
}

Usage :

import React from "react";
import { FlagshipProvider } from "@flagship.io/react-sdk";

const customLog = {
  emergency(message, tag) {
    this.log(LogLevel.EMERGENCY, message, tag);
  },

  alert(message, tag) {
    this.log(LogLevel.ALERT, message, tag);
  },

  critical(message, tag) {
    this.log(LogLevel.CRITICAL, message, tag);
  },

  error(message, tag) {
    this.log(LogLevel.ERROR, message, tag);
  },

  warning(message, tag) {
    this.log(LogLevel.WARNING, message, tag);
  },

  notice(message, tag) {
    this.log(LogLevel.NOTICE, message, tag);
  },

  info(message, tag) {
    this.log(LogLevel.INFO, message, tag);
  },

  debug(message, tag) {
    this.log(LogLevel.DEBUG, message, tag);
  },

  log(level, message, tag) {
    console.log(`[${LogLevel[level]}] [${tag}] : ${message}`);
  },
};

const App = () => (
  <>
    <FlagshipProvider
      envId="YOUR_ENV_ID"
      apiKey="YOUR_API_KEY"
      visitorData={{
        id: "YOUR_VISITOR_ID",
        context: {
          // some context
        },
        isAuthenticated: false,
      }}
      logManager={customLog},
    >
      {/* [...] */}
    </FlagshipProvider>
  </>
);

trackingMangerConfig

The SDK allows you to send hits with a batching system, there is 3 options to configure it : cacheStrategy, poolMaxSize and batchIntervals.

The advantage of batch processing with the TrackingManager is to use less network traffic, avoid loss of hits with cache, and catch all hits that would failed and resend them.

For each hits emitted by a visitor, it will be added into an internal pool.
This pool is going to be emptied and a batch of hits will be sent when the poolMaxSize is reached or when the batchIntervals timer is triggered.

If a batch fails, all of the hits inside the failed batch will be added back into the pool for future iteration, the cache will be updated depending on the cache strategy used.

Note: At any time, when your app is about to close, you can call useFlagship().close() or Flagship.close() to batch and send all hits that are in the pool

options:

CacheStrategy

cacheStrategy is an enum defining the different caching strategies

import React from "react";
import { FlagshipProvider, CacheStrategy } from "@flagship.io/react-sdk";

const App = () => (
  <>
    <FlagshipProvider
      envId="YOUR_ENV_ID"
      apiKey="YOUR_API_KEY" 
      visitorData={{
        id: "YOUR_VISITOR_ID",
        context: {
          // some context
        },
        isAuthenticated: false,
      }}
      trackingMangerConfig={{
        cacheStrategy: CacheStrategy.CONTINUOUS_CACHING,
        poolMaxSize: 10,
        batchIntervals: 5
    }}
    >
      {/* [...] */}
    </FlagshipProvider>
  </>
);

📘

• The CONTINUOUS_CACHING strategy (recommended ) should be used when your application is running in an environment where the probability of data loss is high.
  For example in a browser, a visitor can at any time reload the page and erase all data in memory.

Keep in mind that this strategy can do a lot of database I/O depending on how many hits your visitor can send.

• The PERIODIC_CACHING strategy should be used when your application sends a lot of hits and the probability of data loss is low.

In this strategy, the number of I/Os in the database is low.

useFlagship

Demo:

• to get flags
• to fetch flags
• manage consent
• experience continuity
• to send hits tracking

This is the most used hook from the Flagship React SDK. It gives further functionalities such as getting current flags of your actual visitor, send hit tracking, SDK status...

Returns an object. (Typescript: UseFlagshipOutput)

useFlagship output

useFlagship output setConsent

Set if visitor has consented for protected data usage.

• setConsent(hasConsented: boolean): void;

It has one argument :

useFlagship output updateContext

Update the visitor context values, matching the given keys, used for targeting.

A new context value associated with this key will be created if there is no previous matching value.

• updateContext(context: Record<string, string | number | boolean>): void

It has one argument :

useFlagship output clearContext

Clear the actual visitor context

• clearContext(): void

useFlagship output fetchFlags

In DecisionApi Mode this function calls the Flagship Decision API to run campaign assignments according to the current visitor context and retrieve applicable flags.

In bucketing Mode, it checks bucketing file, validates campaigns targeting the visitor, assigns a variation and retrieve applicable flags

• fetchFlags(): Promise<void>

useFlagship output getFlag

Return a Flag object by its key. If no flag match the given key an empty flag will be returned. Call exists() to check if the flag has been found.

• getFlag<T>(key:string, defaultValue: T) : IFlag<T>

🚧

• Default value must be one of the following type : string, number, boolean, object, array.

useFlagship output authenticate

Authenticate anonymous visitor

• authenticate(visitorId: string): void

useFlagship output unauthenticate

This function change authenticated Visitor to anonymous visitor

• unauthenticate(): void

useFlagship output hit

useFlagship output status

🚧

All useFlagship hook methods will be deactivated when visitor is not initialized except getFlag

useFsFlag

This hook returns a Flag object by its key. If no flag match the given key an empty flag will be returned.

• useFsFlag<T>(key: string, defaultValue: T) : IFlag<T>

Flag class api

getValue function

To retrieve flag current value, simply call value() method of the Flag object.

• getValue(visitorExposed:boolean):T function

Returns the value from the assigned campaign variation or the Flag default value if the Flag does not exist, or if types are different.

🚧

Will return default value when visitor is not yet initialized

metadata property

You may need to send campaign IDs or variation IDs to a third party for reporting and/or analytics purposes. It is possible to retrieve campaigns metadata for a specific Flag.

• metadata:IFlagMetadata

Return the campaign information metadata or an empty object if the Flag doesn't exist or if the default value type does not correspond to the Flag type in Flagship.

interface IFlagMetadata{
    campaignId:string
    variationGroupId:string
    variationId: string
    isReference: boolean
    campaignType: string
}

visitorExposed function

By default when the method getValue() is called, The SDK considers that the visitor have seen the effets of your Flag, unless you pass false to getValue(). In this case you will have to call visitorExposed().

There are two ways for exposing a visitor to a flag:

1. Pass an visitorExposed=true parameter to the getValue() method.
2. Use the following visitorExposed() method from the Flag instance.

• visitorExposed(): Promise<void>

Tells Flagship the visitor have been exposed and have seen this flag. This will increment the visits for the current variation on your campaign reporting. No visitor exposure will be sent if the Flag doesn't exist or if the default value type do not correspond to the Flag type in Flagship.

• userExposed(): Promise<void> deprecated

Tells Flagship the visitor have been exposed and have seen this flag. This will increment the visits for the current variation on your campaign reporting. No visitor exposure will be sent if the Flag doesn't exist or if the default value type do not correspond to the Flag type in Flagship.

🚧

userExposed is deprecated, use visitorExposed instead

exists function

This method will return true if a Flag exists in Flagship

• exists(): boolean

Getting flags

with useFsFlag hook

Demo:

import React from "react";
import { useFsFlag } from "@flagship.io/react-sdk";

export const MyReactComponent = () => {
  const flag = useFsFlag("backgroundColor","green")
  const flagExists = flag.exists()
  const flagMetadata = flag.metadata
  
  return (
    <button
    	onClick={()=>{
				// Report the flag exposure
  			flag.visitorExposed()
  		}}
      style={{
        height: "200px",
        width: "200px",
        backgroundColor: flag.getValue(),
      }}
    >
      {"I'm a square with color=" + flag.getValue()}
    </button>
  );
};

with useFlagship hook

Demo:

import React from "react";
import { useFlagship } from "@flagship.io/react-sdk";

export const MyReactComponent = () => {
  const { getFlag } = useFlagship()
  const flag = getFlag("backgroundColor","green")
  const flagExists = flag.exists()
  const flagMetadata = flag.metadata
  
  return (
    <button
      style={{
        height: "200px",
        width: "200px",
        backgroundColor: flag.getValue(),
      }}
    >
      {"I'm a square with color=" + flag.getValue()}
    </button>
  );
};

Report a Flag exposure

import React from "react";
import { useFsFlag } from "@flagship.io/react-sdk";

export const MyReactComponent = () => {
  const flag = useFsFlag("backgroundColor","green")
  const flagExists = flag.exists()
  const flagMetadata = flag.metadata
  
  return (
    <button
    	onClick={()=>{
				// Report the flag exposure
  			flag.visitorExposed()
  		}}
      style={{
        height: "200px",
        width: "200px",
        backgroundColor: flag.getValue(),
      }}
    >
      {"I'm a square with color=" + flag.getValue()}
    </button>
  );
};

import React from "react";
import { useFlagship } from "@flagship.io/react-sdk";

export const MyReactComponent = () => {
  const { getFlag } = useFlagship()
  const flag = getFlag("backgroundColor","green")
  const flagExists = flag.exists()
  const flagMetadata = flag.metadata
  
  return (
    <button
    onClick={()=>{
				// Report the flag exposition 
  			flag.visitorExposed()
  		}}
      style={{
        height: "200px",
        width: "200px",
        backgroundColor: flag.value(),
      }}
    >
      {"I'm a square with color=" + flag.value()}
    </button>
  );
};

Fetching Flags

with useFlagship hook

Demo:

import React from "react";
import { useFlagship } from "@flagship.io/react-sdk";

export const MyReactComponent = () => {
  const { fetchFlags } = useFlagship()
  
  return (
    <button
    	onClick={()=>{
  			fetchFlags().then(()=>{
    		// Notify success...
    		}).catch(()=>{
    		// Notify error...
    	})
  	}}>
      Trigger a fetch flag
    </button>
  );
};

Managing visitor consent

With Flagship React SDK, you can manage visitor consent for data privacy usage. When False, campaign activation and hits will be disabled.

There are 2 ways to set visitor consent :

1. Set hasConsented key to true or false in props VisitordData of FlagshipProvider
2. Use setConsent method of useFlagship hook

Demo:

import React from "react";
import { FlagshipProvider } from "@flagship.io/react-sdk";

const App = () => (
  <>
    <FlagshipProvider
      envId="YOUR_ENV_ID"
      apiKey="YOUR_API_KEY"
      visitorData={{
        id: null, // or remove this line
        context: {
          // some context
        },
        hasConsented: true, // set hasConsented to true or false
      }}
    >
      {/* [...] */}
    </FlagshipProvider>
  </>
);

import React from "react";
import { useFlagship } from "@flagship.io/react-sdk";

export const MyReactComponent = () => {
  const { setConsent } = useFlagship()
  
  return (
    <button
    	onClick={()=>{
    
  			setConsent(true)
    
  	}}>
      Accept consent 
    </button>
  );
};

📘

When a visitor sets consent to false, the data collection features (visitorExposed and sendHit) will be deactivated for them and all hits related to the visitor will be flushed from the pool and the cache.

Update context with predefined keys of context

Demo:

import React from "react";
import { FlagshipProvider, DEVICE_LOCALE } from "@flagship.io/react-sdk";

const App = () => (
  <>
    <FlagshipProvider
      envId="YOUR_ENV_ID"
      apiKey="YOUR_API_KEY"
      visitorData={{
        id: null, // or remove this line
        context: {
          [DEVICE_LOCALE]: "fr",
        },
  			hasConsented: true, // set hasConsented to true or false
      }}
    >
      {/* [...] */}
    </FlagshipProvider>
  </>
);

import React from "react";
import { useFlagship } from "@flagship.io/react-sdk";

export const MyReactComponent = () => {
  const { updateContext } = useFlagship()
  
  return (
    <button
    	onClick={()=>{
    
  			updateContext({
         [DEVICE_LOCALE]: "fr"
        })
    
  	}}>
      Trigger update context
    </button>
  );
};

Learn more about predefined keys of context

Experience continuity

🚧

Make sure that the experience continuity option is enabled on the flagship platform before using those methods.

It might happen that a visitor from your app is not yet recognized and is being authenticated (and recognized) later on...

From there, we provide the ability to ensure that during such transition, your visitor will keep same experience (meaning targetting still the same campaign's variations and thus same modifications).

In order to do a successful experience continuity, we will have to distinguish when the visitor is anonymous or authenticated.

Let's assume basic scenario to understand how things work:

1. Your visitor arrives on your app for the first time

We need to initialize the visitor but as we don't know anything about this visitor, we'll create a random visitor id or let the SDK do it for us. You can also specify some visitor context if necessary.

import React from "react";
import { FlagshipProvider } from "@flagship.io/react-sdk";

const App = () => (
  <>
    <FlagshipProvider
      envId="YOUR_ENV_ID"
      apiKey="YOUR_API_KEY"
      visitorData={{
        id: null, // or remove this line
        context: {
          // some context
        },
        isAuthenticated: false, //
      }}
    >
      {/* [...] */}
    </FlagshipProvider>
  </>
);

Whatever how it has been set, the actual visitor id will be what we call its anonymous id.

📘

Be aware that when you do not specify a visitor id, as enableClientCache is enable by default, the SDK will try to find a previous visitor experience. If so, the new visitor will have the same visitor id as it was during the previous visitor session. From there, no id will be automatically generated.

2. Your visitor is signing in.

We need to set the value of visitorData.isAuthenticated to true or call the method authenticate of useFlagship hook.

Moreover, the visitor id set should be an existing visitor id (that has previously seen specific campaign's flags) in order to make the experience continuity effective.

import React from "react";
import { FlagshipProvider } from "@flagship.io/react-sdk";

const App = () => (
  <>
    <FlagshipProvider
      envId="YOUR_ENV_ID"
      apiKey="YOUR_API_KEY"
      visitorData={{
        id: "AUTHENTICATED_ID",
        context: {
          // some context
        },
        isAuthenticated: true,
      }}
    >
      {/* [...] */}
    </FlagshipProvider>
  </>
);

import React from "react";
import { useFlagship } from "@flagship.io/react-sdk";

export const MyReactComponent = () => {
  const { authenticate } = useFlagship()
  
  return (
    <button
    	onClick={()=>{
    
  			// ... sign in code
    
    		authenticate("AUTHENTICATED_ID")
    
    		
    	})
  	}}>
      Trigger sign in
    </button>
  );
};

This new visitor id is what we call its authenticated id.

The visitor is updated as authenticated, keeping the previous variations from campaigns that are still matched and thus gives you same modifications as before being logged in.

📘

Keep in mind that if the visitor also has its context changed, you might still have changes on flags as your visitor might target new campaigns.

3. Your visitor decide to sign out.

We need to set the value of visitorData.isAuthenticated back to false.

If you want to keep the same visitor (anonymous) experience as before, depending on the value of prop enableClientCache, you'll have to:

• enableClientCache=true: the sdk will put back the previous anonymous id
  automatically based on data from cache.

import React from "react";
import { FlagshipProvider } from "@flagship.io/react-sdk";

const App = () => (
  <>
    <FlagshipProvider
      envId="YOUR_ENV_ID"
      apiKey="YOUR_API_KEY"
      visitorData={{
        id: null,
        context: {
          // some context
        },
        isAuthenticated: false, // <--- back to false
      }}
    >
      {/* [...] */}
    </FlagshipProvider>
  </>
);

import React from "react";
import { useFlagship } from "@flagship.io/react-sdk";

export const MyReactComponent = () => {
  const { unauthenticate } = useFlagship()
  
  return (
    <button
    	onClick={()=>{
    
  			// ... sign out code
    
    		unauthenticate()
    
    		
    	})
  	}}>
      Trigger sign out
    </button>
  );
};

• enableClientCache=false: you should specify in
prop, the same value as you set in step 1.

import React from "react";
import { FlagshipProvider } from "@flagship.io/react-sdk";

const App = () => (
  <>
    <FlagshipProvider
      envId="YOUR_ENV_ID"
      apiKey="YOUR_API_KEY"
      visitorData={{
        id: "YOUR_VISITOR_ID", // <--- same value as step 1
        context: {
          // some context
        },
        isAuthenticated: false, // <--- back to false
      }}
    >
      {/* [...] */}
    </FlagshipProvider>
  </>
);

If you need a completly brand new visitor experience, you should put a new visitor id in visitorData.id prop instead:

import React from "react";
import { FlagshipProvider } from "@flagship.io/react-sdk";

const App = () => (
  <>
    <FlagshipProvider
      envId="YOUR_ENV_ID"
      apiKey="YOUR_API_KEY"
      visitorData={{
        id: "YOUR_BRAND_NEW_VISITOR_ID", // <--- new value
        context: {
          // some context
        },
        isAuthenticated: false, // <--- back to false
      }}
    >
      {/* [...] */}
    </FlagshipProvider>
  </>
);

Hit Tracking

This section helps you track your visitors in your application and learn how to build hits in order to feed your reports. For more information about our measurement protocol, read our Universal Collect documentation.

There are five different types of Hits available:

• Page
• Screen
• Transaction
• Item
• Event

HitType

import React from "react";
import { useFlagship, HitType } from "@flagship.io/react-sdk";

export const MyReactComponent = () => {
  const { hit: fsHit } = useFlagship()
  
  return (
    <button
    	onClick={()=>{
    
    		const pageHit = {
          type: HitType.PAGE,
          documentLocation: "https://localhost",
        }
				
  			fsHit.send(pageHit).then(()=>{
        		// Notify success
        }).catch(()=>{
        		// Notify error
        })
  		}}
    >
      Send a hit
    </button>
  );
};

They must all be built and sent with the following functions from the `useFlagship hook

import React from "react";
import { useFlagship, HitType } from "@flagship.io/react-sdk";

export const MyReactComponent = () => {
  const { hit: fsHit } = useFlagship()
  
  return (
    <button
    	onClick={()=>{
    
    fsHit.send({
      type: HitType.PAGE,
      documentLocation: "https://localhost"
    })
    
   		 // or send multiple
    		
    fsHit.sendMultiple(
      {
        type: HitType.PAGE,
        documentLocation: "https://localhost"
      },
      {
        type: HitType.SCREEN,
        documentLocation: "home"
      }
    )
  }}
    >
      Send a hit
    </button>
  );
};

useFlagship output hit.send function

Send Hit to Flagship servers for reporting.

• send (hit: IHit): Promise<void>

useFlagship output hit.sendMultiple function

Send Hits to Flagship servers for reporting.

• sendMultiple(hits: IHit[]): Promise<void>

Hit common optional parameters

import React from "react";
import { useFlagship, HitType } from "@flagship.io/react-sdk";

export const MyReactComponent = () => {
  const { hit: fsHit } = useFlagship()
  
  return (
    <button
    onClick={()=>{
    
    fsHit.send({
      type: HitType.PAGE,
      documentLocation: "https://localhost",
      userIp: "127.0.0.1",
      screenResolution: "800X600",
      locale: "fr",
      sessionNumber: "1234"
    })
  }}
	>
      Send a hit
    </button>
  );
};

Page

This hit should be sent each time a visitor arrives on a new page.

import React, { useEffect } from "react";
import { useFlagship, HitType } from "@flagship.io/react-sdk";

export const MyReactComponent = () => {
    const { hit: fsHit } = useFlagship();

    useEffect(() => {
        fsHit.send({
            type: HitType.PAGE, // or "PAGEVIEW",
            documentLocation: '<PAGE_URL>' // https://example.com/my/page/url
        });
    }, []);

    return <>{/* [...] */}</>;
};

• A hit of type Page has this following structure:

Screen

This hit should be sent each time a visitor arrives on an interface on client side.

import React, { useEffect } from "react";
import { useFlagship, HitType } from "@flagship.io/react-sdk";

export const MyReactComponent = () => {
    const { hit: fsHit } = useFlagship();

    useEffect(() => {
        fsHit.send({
            type: HitType.SCREEN, // or "SCREENVIEW",
            documentLocation: '<SCREEN_NAME>'
        });
    }, []);

    return <>{/* [...] */}</>;
};

• A hit of type Screen has this following structure:

Transaction

This hit should be sent when a visitor completes a Transaction.

import React from "react";
import { useFlagship, HitType } from "@flagship.io/react-sdk";

export const MyReactComponent = () => {
  const { hit: fsHit } = useFlagship()
  
  return (
    <button
    	onClick={()=>{
				
  			fsHit.send({
          type: HitType.TRANSACTION, //or "TRANSACTION"
          transactionId: "#12345",
          affiliation: "affiliation",
          taxes: 19.99,
          currency: "USD",
          couponCode: "code",
          itemCount: 1,
          shippingMethod: "road",
          shippingCosts: 5,
          paymentMethod: "credit_card",
          totalRevenue: "199.99"
        })
    
  		}}
    >
      Send a hit
    </button>
  );
};

A hit of type TRANSACTION has this following structure:

Item

This hit is used to link an item with a transaction. It must be sent after the corresponding transaction hit.

import React from "react";
import { useFlagship, HitType } from "@flagship.io/react-sdk";

export const MyReactComponent = () => {
  const { hit: fsHit } = useFlagship()
  
  return (
    <button
    	onClick={()=>{
				
  			fsHit.send({
          type: HitType.ITEM, //or "ITEM"
          transactionId: "#12345",
          productName: "product",
          productSku: "sku123",
          itemPrice: 199.99,
          itemQuantity: 1,
          itemCategory: "test"
        })
    
  		}}
    >
      Send a hit
    </button>
  );
};

A hit of type ITEM has this following structure:

📘

The Item hit isn't available yet in the Flagship reporting view.

Event

This hit can be used for any event (e.g. Add To Cart click, newsletter subscription).

import React from "react";
import { useFlagship, HitType } from "@flagship.io/react-sdk";

export const MyReactComponent = () => {
  const { hit: fsHit } = useFlagship()
  
  return (
    <button
    	onClick={()=>{
				
  			fsHit.send({
          type: HitType.EVENT, //or "EVENT"
          category: EventCategory.USER_ENGAGEMENT, // or EventCategory.ACTION_TRACKING
          action: "click",
          label: "label",
          value: 100,
        })
    
  		}}
    >
      Send a hit
    </button>
  );
};

A hit of type EVENT has this following structure:

Managing visitor cache

The aims of the cache management is the response to the following problematic:

• Re-allocation in bucketing mode :

In bucketing mode, the SDK will always keep visitor in variation where he was allocated first, in case of the customer or the dynamic allocation has changed the traffic allocation. Indeed in bucketing mode the assignation is made on local device so changing campaign allocation in the platform would make visitors to see different campaigns.

• Handle offline mode on client side :

With the cache enabled, the SDK will try to retrieve the latest visitor data (campaign assignations) from the cache, also will save all the failed hits and visitorExposed in order to resend them later.

By default the Flagship ReactJS SDK provide a default cache manager implementation. It is possible to use your own cache manager by implementing the intefaces IVisitorCacheImplementation and IHitCacheImplementation through visitorCacheImplementation and hitCacheImplementation props of FlagshipProvider.

Visitor Cache

The visitor cache is used to store the visitor data in a database through the IVisitorCacheImplementation interface which defines the methods that an object must implement in order to handle it.

interface IVisitorCacheImplementation {
  cacheVisitor: (visitorId: string, Data: VisitorCacheDTO) => void;
  lookupVisitor(visitorId: string): VisitorCacheDTO;
  flushVisitor(visitorId: string): void;
}

cacheVisitor function

This method is called when the SDK needs to cache visitor information in your database.

• public cacheVisitor(visitorId: string, Data: object):void

It has 2 arguments :

lookupVisitor function

This method is called when the SDK needs to get the visitor information corresponding to visitor ID from your database.

It has to return an object of type VisitorCacheDTO which follows this shape see.

• public lookupVisitor(visitorId: string): object

It has one argument :

flushVisitor function

This method is called when the SDK needs to erase the visitor information corresponding to visitor ID in your database.

It will be called every time setConsent get false.

• public flushVisitor(visitorId: string): void

It has one argument :

📘

• flushVisitor method will be called every time setConsent get false.

VisitorCacheDTO

type VisitorCacheDTO = {
  version: number;
  data: {
    visitorId: string;
    anonymousId: string | null;
    consent?: boolean;
    context?: Record<string, boolean|number|string>;
    campaigns?: Array<{
      campaignId: string;
      variationGroupId: string;
      variationId: string;
      isReference?: boolean;
      type: string;
      activated?: boolean;
      flags?: Record<string, unknown>;
    }>;
  };
};

Hit Cache

The hit cache is used to store hits in your database depending on strategy used through the IHitCacheImplementation interface which defines the methods that an object must implement to handle it.

interface IHitCacheImplementation {
    cacheHit(hits: Record<string, HitCacheDTO>):Promise<void>
    lookupHits():Promise<Record<string, HitCacheDTO>>
    flushHits(hitKeys: string[]): Promise<void>
    flushAllHits(): Promise<void>
}

cacheHit function

This method will be called to cache hits depending on cache strategy used.

• public cacheHit(hits: Record<string, HitCacheDTO>):Promise<void>

It has 1 argument :

lookupHits function

This method will be called to load all hits from your database and trying to send them again in the background.

It has to return an object where the key is a unique ID for each hit and the value is an object of type HitCacheDTO which follows this shape see.

• public lookupHits():Promise<Record<string, HitCacheDTO>>

flushHits function

This method will be called to erase all hits matching the unique Hits ID from your database.

NOTE: It will be called every time setConsent get false to erase all hits from database for visitor who set consent to false.

• public flushHits(hitKeys: string[]): Promise<void>

It has one argument :

flushAllHits function

This method will be called to erase all hits in your database without exception.

• public flushAllHits(): Promise<void>

HitCacheDTO

type HitCacheLookupDTO = {
  version: number;
  data: {
    visitorId: string;
    anonymousId: string | null;
    type: HitType | "ACTIVATE";
    time: number;
    content?: Record<string, unknown>;
  };
};

📘

• The flushHits method will be called whenever the visitor's consent changes to false.
• Hits older than 4H will be ignored during the resending process.

Appendix

Predefined visitor context keys

The Flagship SDK contains predefined visitor context keys.

The keys marked as Yes in the Auto-set by SDK column will be automatically set, while the ones marked as No need to be set by customer.

You can overwrite these keys at any time. The keys-value pairs will be sent to the server in the visitor context and can be edited in the Persona section of the Flagship platform.

📘

To overwrite the keys, use the updateContext method

License

This Flagship SDK is distributed under the Apache version 2.0 license.