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chore: add capture on viewed to playground
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‎.changeset/calm-tools-know.md‎

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@@ -0,0 +1,6 @@
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---
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'@posthog/react': minor
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'posthog-js': minor
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---
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feat: add a component that will wrap your components and capture an event when they are in view in the browser

‎packages/react/src/components/PostHogFeature.tsx‎

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@@ -1,7 +1,8 @@
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import { useFeatureFlagPayload, useFeatureFlagVariantKey, usePostHog } from '../hooks'
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import React, { Children, ReactNode, useCallback, useEffect, useRef } from 'react'
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import React from 'react'
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import { PostHog } from '../context'
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import { isFunction, isNull, isUndefined } from '../utils/type-utils'
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import { isFunction, isUndefined } from '../utils/type-utils'
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import { VisibilityAndClickTrackers } from './internal/VisibilityAndClickTrackers'
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export type PostHogFeatureProps = React.HTMLProps<HTMLDivElement> & {
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flag: string
@@ -25,6 +26,7 @@ export function PostHogFeature({
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}: PostHogFeatureProps): JSX.Element | null {
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const payload = useFeatureFlagPayload(flag)
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const variant = useFeatureFlagVariantKey(flag)
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const posthog = usePostHog()
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2931
const shouldTrackInteraction = trackInteraction ?? true
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const shouldTrackView = trackView ?? true
@@ -37,6 +39,8 @@ export function PostHogFeature({
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options={visibilityObserverOptions}
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trackInteraction={shouldTrackInteraction}
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trackView={shouldTrackView}
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onInteract={() => captureFeatureInteraction({ flag, posthog, flagVariant: variant })}
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onView={() => captureFeatureView({ flag, posthog, flagVariant: variant })}
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{...props}
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>
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{childNode}
@@ -46,7 +50,7 @@ export function PostHogFeature({
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return <>{fallback}</>
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}
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49-
function captureFeatureInteraction({
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export function captureFeatureInteraction({
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flag,
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posthog,
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flagVariant,
@@ -65,7 +69,7 @@ function captureFeatureInteraction({
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posthog.capture('$feature_interaction', properties)
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}
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68-
function captureFeatureView({
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export function captureFeatureView({
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flag,
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posthog,
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flagVariant,
@@ -83,92 +87,3 @@ function captureFeatureView({
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}
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posthog.capture('$feature_view', properties)
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}
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87-
function VisibilityAndClickTracker({
88-
flag,
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children,
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onIntersect,
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onClick,
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trackView,
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options,
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...props
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}: {
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flag: string
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children: React.ReactNode
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onIntersect: (entry: IntersectionObserverEntry) => void
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onClick: () => void
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trackView: boolean
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options?: IntersectionObserverInit
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}): JSX.Element {
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const ref = useRef<HTMLDivElement>(null)
104-
const posthog = usePostHog()
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106-
useEffect(() => {
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if (isNull(ref.current) || !trackView) return
108-
109-
// eslint-disable-next-line compat/compat
110-
const observer = new IntersectionObserver(([entry]) => onIntersect(entry), {
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threshold: 0.1,
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...options,
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})
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observer.observe(ref.current)
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return () => observer.disconnect()
116-
}, [flag, options, posthog, ref, trackView, onIntersect])
117-
118-
return (
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<div ref={ref} {...props} onClick={onClick}>
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{children}
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</div>
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)
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}
124-
125-
function VisibilityAndClickTrackers({
126-
flag,
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children,
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trackInteraction,
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trackView,
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options,
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...props
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}: {
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flag: string
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children: React.ReactNode
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trackInteraction: boolean
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trackView: boolean
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options?: IntersectionObserverInit
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}): JSX.Element {
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const clickTrackedRef = useRef(false)
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const visibilityTrackedRef = useRef(false)
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const posthog = usePostHog()
142-
const variant = useFeatureFlagVariantKey(flag)
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144-
const cachedOnClick = useCallback(() => {
145-
if (!clickTrackedRef.current && trackInteraction) {
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captureFeatureInteraction({ flag, posthog, flagVariant: variant })
147-
clickTrackedRef.current = true
148-
}
149-
}, [flag, posthog, trackInteraction, variant])
150-
151-
const onIntersect = (entry: IntersectionObserverEntry) => {
152-
if (!visibilityTrackedRef.current && entry.isIntersecting) {
153-
captureFeatureView({ flag, posthog, flagVariant: variant })
154-
visibilityTrackedRef.current = true
155-
}
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}
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158-
const trackedChildren = Children.map(children, (child: ReactNode) => {
159-
return (
160-
<VisibilityAndClickTracker
161-
flag={flag}
162-
onClick={cachedOnClick}
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onIntersect={onIntersect}
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trackView={trackView}
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options={options}
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{...props}
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>
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{child}
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</VisibilityAndClickTracker>
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)
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})
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return <>{trackedChildren}</>
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}

‎packages/react/src/components/internal/VisibilityAndClickTracker.tsx‎

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@@ -5,6 +5,7 @@ import { isNull } from '../../utils/type-utils'
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* VisibilityAndClickTracker is an internal component,
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* its API might change without warning and without being signalled as a breaking change
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*
8+
* Wraps the provided children in a div, and tracks visibility of and clicks on that div
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*/
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export function VisibilityAndClickTracker({
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children,

‎packages/react/src/components/internal/VisibilityAndClickTrackers.tsx‎

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Original file line numberDiff line numberDiff line change
@@ -1,48 +1,60 @@
1-
import React, { MouseEventHandler, useEffect, useMemo, useRef } from 'react'
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import { isNull } from '../../utils/type-utils'
1+
import React, { Children, ReactNode, useCallback, useRef } from 'react'
2+
import { VisibilityAndClickTracker } from './VisibilityAndClickTracker'
33

44
/**
5-
* VisibilityAndClickTracker is an internal component,
5+
* VisibilityAndClickTrackers is an internal component,
66
* its API might change without warning and without being signalled as a breaking change
77
*
8+
* Wraps each of the children passed to it for visiblity and click tracking
9+
*
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*/
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export function VisibilityAndClickTracker({
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export function VisibilityAndClickTrackers({
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children,
11-
onIntersect,
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onClick,
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trackInteraction,
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trackView,
1415
options,
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onInteract,
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onView,
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...props
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}: {
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flag: string
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children: React.ReactNode
18-
onIntersect: (entry: IntersectionObserverEntry) => void
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onClick?: MouseEventHandler<HTMLDivElement>
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trackInteraction: boolean
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trackView: boolean
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options?: IntersectionObserverInit
25+
onInteract?: () => void
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onView?: () => void
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}): JSX.Element {
23-
const ref = useRef<HTMLDivElement>(null)
28+
const clickTrackedRef = useRef(false)
29+
const visibilityTrackedRef = useRef(false)
2430

25-
const observerOptions = useMemo(
26-
() => ({
27-
threshold: 0.1,
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...options,
29-
}),
30-
// eslint-disable-next-line react-hooks/exhaustive-deps
31-
[options?.threshold, options?.root, options?.rootMargin]
32-
)
31+
const cachedOnClick = useCallback(() => {
32+
if (!clickTrackedRef.current && trackInteraction && onInteract) {
33+
onInteract()
34+
clickTrackedRef.current = true
35+
}
36+
}, [trackInteraction, onInteract])
3337

34-
useEffect(() => {
35-
if (isNull(ref.current) || !trackView) return
38+
const onIntersect = (entry: IntersectionObserverEntry) => {
39+
if (!visibilityTrackedRef.current && entry.isIntersecting && onView) {
40+
onView()
41+
visibilityTrackedRef.current = true
42+
}
43+
}
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37-
// eslint-disable-next-line compat/compat
38-
const observer = new IntersectionObserver(([entry]) => onIntersect(entry), observerOptions)
39-
observer.observe(ref.current)
40-
return () => observer.disconnect()
41-
}, [observerOptions, trackView, onIntersect])
45+
const trackedChildren = Children.map(children, (child: ReactNode) => {
46+
return (
47+
<VisibilityAndClickTracker
48+
onClick={cachedOnClick}
49+
onIntersect={onIntersect}
50+
trackView={trackView}
51+
options={options}
52+
{...props}
53+
>
54+
{child}
55+
</VisibilityAndClickTracker>
56+
)
57+
})
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43-
return (
44-
<div ref={ref} {...props} onClick={onClick}>
45-
{children}
46-
</div>
47-
)
59+
return <>{trackedChildren}</>
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}

‎playground/react-nextjs/app/page.tsx‎

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Original file line numberDiff line numberDiff line change
@@ -31,7 +31,11 @@ export default function Home() {
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<h2 style={{ fontSize: '1.5rem', color: '#555' }}>Scroll down to see the gallery...</h2>
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</div>
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34-
<div
34+
<PostHogCaptureOnViewed
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name="cat-gallery"
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properties={{ gallery_size: catImages.length, gallery_type: 'cats' }}
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trackAllChildren
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observerOptions={{ threshold: 0.1 }}
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style={{
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display: 'grid',
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gridTemplateColumns: 'repeat(auto-fill, minmax(300px, 1fr))',
@@ -63,11 +67,22 @@ export default function Home() {
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/>
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</div>
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))}
66-
</div>
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</PostHogCaptureOnViewed>
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68-
<div style={{ height: '50vh', marginTop: '2rem' }}>
72+
<PostHogCaptureOnViewed
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name="test-element"
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properties={{ test: true }}
75+
observerOptions={{ threshold: 0.1 }}
76+
style={{
77+
padding: '2rem',
78+
backgroundColor: '#00b894',
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color: 'white',
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height: '50vh',
81+
marginTop: '2rem',
82+
}}
83+
>
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<p style={{ color: '#666' }}>End of page</p>
70-
</div>
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</PostHogCaptureOnViewed>
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</div>
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</main>
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)

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