Flatlist getitemlayout github example. Configurable viewability callbacks.

Flatlist getitemlayout github example Skip to content. 🐛 Bug Report Contents of FlatList disappear upon quick scrolling To Reproduce When a FlatList is scrolled with a pull to refresh and goes through multiple pages, and then scrolled up quickly, the content disappears. As flatlists are vital parts of almost every app nowadays, The List view You signed in with another tab or window. Use a FlatList; add the getItemLayout prop; add stickyHeaderIndices prop; Use elevation style property on your Description I'm using FlatList to load some records. Note: cannot scroll to locations outside the render window without specifying the Hi, there is an ambiguity in the docs regarding the getItemLayout prop of FlatList. ; index (number): The index corresponding to this item in the data array. However, it seems like my scrollToEnd call ends up firing well before the FlatList has calculated all of its children. We want to keep track of which items in a FlatList are currently being displayed. We run into a problem with Android that the onFocus call The FlatList component is supposed to be a performant solution for displaying large lists of data in your app. getItemLayout is the most efficient, and is easy to use if you getItemLayout = (data, index) => ({ length: 50, offset: 50 * index, index }) getColor(index) {const mod = index%3; return COLORS[mod];} scrollToIndex = => {let randomIndex = To understand the problem, a video is attached with a FlatList having multiple components at same height (600pt) each separated by an ItemSeparator (50pt). item (Object): The item from data being rendered. 14. So, if you can make it for me using your library then it's very much appreciated. More Description I'm encountering an issue with FlatList in a React Native application where items are not fully occupying the screen height when scrolling. getItemLayout} keyExtractor={this. Bug I am using react native video within a flatlist, I have realized that if I go up and down very quickly in the flatlist if I exceed 20 elements, the application crashes and stays stuck. We've noticed weird behaviour with the FlatList which seems to be caused by providing the stickyHeaderIndices prop. We have a list with a FlatList containing multiple Flatlist horizontal. To review, open the file in an editor that reveals hidden Unicode characters. Looks like there Snack, code example, screenshot, or link to a repository: I've included code and screenshots of the result for when the prop is active and inactive. The problem arises when the height of list items isn't readily available during the Provides additional metadata like index. By binding the onPressItem handler, the props will remain === and PureComponent will prevent wasteful re-renders unless the actual id , selected , or title props change, even if the inner Simple example of react native gridview list using react-native native component <FlatList>. \n \n; By passing extraData={selectedId} to FlatList we make sure FlatList itself will re-render when the state changes. scrollToEnd({animated: false}); But it scrolls somewhere in the I have a FlatList of user photos, and have share receiving setup in my app. But when the items change, in our case because of a pull-to-refresh, onViewableItemsChanged isn't called until the next scroll event. selected changes. Run react-native info in your terminal and paste its contents here. Although has helped to not clog up whatever is making the feed stutter, it still has some frame drops. Setting this prop to something other Large data source list component, items reused by group, Less CPU/Memory usage. but I felt I gave wrong ITEM_HEIGHT to it. 69 was that the component would have a tendency to blank out once you passed the initial render window and the scroll in general would behave very erratically - removing the stickyHeaderIndices fixed it. viewOffset is a fixed number of pixels to offset the final target position. Write better code with AI Security. I've already done loads of research and Google-Fu to try a solution, but a basic test example app that uses react-native-draggable-flatlist - hdsenevi/react-native-draggable-flatlist-example These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. A regular sectionlist crashes if the list is huge and getItemLayout() is not implemented while calling Create FlatList with appropriate snapToInterval, getItemLayout and viewabilityConfigCallbackPairs properties; add 10 items; scroll to index 3, 6 or 9; monitor onViewableItemsChanged callback; NOTE, I'm using the horizontal list type and didn't test more than index 9. Possibly similar to #13454 but You can see this also in your example provided. getItemLayout called too many times. first 10 item show up normally but numbers start to shift to the right as scroll forward. Navigation Menu Toggle navigation. getItemLayout prop; stickyHeaderIndices prop; list items with elevation style property; Android; React Native version: 0. You signed in with another tab or window. For example, if I had two data to render, I will get two different flatlists and similarly, three flatlists with three data. My understanding is that the FlatList lays out only a few next items in the list (initialNumToRender) and can scroll only to those items, but not beyond. Description I've been having lots of trouble trying to avoid getting the "VirtualizedList: You have a large list that is slow to update" warning when using a <FlatList> component with React-Native. Flatlist actually have a great solution to speed up cell measuring called getItemLayout. Reload to refresh your session. Fully support react-native-lottie. Not Completed No test or sample exists for the prop. If you get this calculation wrong by a single pixel, it causes various artefacts in the list scrolling and rendering behaviour. The three arguments to the getItemLayout callback are: length: Height of each individual row. The list prop can also be empty and you can use renderWhenEmpty prop to tell FlatList what to render when the list is empty, like so: Environment. scrollToIndex() scrollToIndex((params: object)); Scrolls to the item at the specified index such that it is positioned in the viewable area such that viewPosition 0 places it at the top, 1 at the bottom, and 0. Minimal Example: < Scroll to index Flatlist example. I did manage to half fix it by using some workarounds basically I used onViewableItemsChanged, onMomentumScrollEnd and onTouchEnd to check which elements are viewable right now and scroll to one of them, it's messy code and not really the best way but Scroll to index Flatlist example. When a user shares a new photo into my app, the photo is added to the bottom of the list, and I want to scroll to the end to display the newly-added content. Reproducible Demo I'm using a FlatList where each row can be of different height (and may contain a mix of both text and zero or more images from a remote server). You can set the getItemLayout to your FlatList component. You switched accounts on another tab or window. *Before(I I did not find any way to use getItemLayout when the rows have variable heights , So you can not use initialScrollIndex. so i deleted my own getItemLayout implementation in FlatList option then i fixed the 'few pixels bouncing' problem. A FlatList which can handle prepending and appending and still holding the current position - steuerbot/react-native-bidirectional-flatlist GitHub community articles Repositories. You An example of an Animated Flatlist. It worked for me like charm. Description. To render multiple columns, use the numColumns prop. import React You signed in with another tab or window. getItemLayout is React Native FlatList rendering issues with large datasets. I checked source code and noticed that you use measureLayout method for each cell. The setup involves displaying video items in a FlatList within a bottom tab navigator, with each item intended to Description I am developing in windows for android I have built a column of images in the FlatList. using expo and react native - Mazahir26/react-native-animated-flatlist. memo: These hooks optimize rendering by memoizing expensive computations and preventing unnecessary re-renders. Using FlatList/SectionList, found FlatList. Hi there! This issue is being closed because it has been inactive for a while. Without setting this prop, FlatList would not know it needs to re-render any items because it is also a PureComponent and I have reviewed the documentation I have searched existing issues I am using the latest React Native version <Flatlist> horizontal true component does not work properly on Rtl devices, it renders the items again and jumps to head of list getItemLayout is an optional optimization that let us skip the measurement of dynamic content if you know the height of items ahead of time. getItemLayout is efficient to use if you have fixed height items, for example: getItemLayout = {(data, index) => ({length: ITEM_HEIGHT, offset: ITEM_HEIGHT * index, index})} You signed in with another tab or window. The issue we saw on RN 0. Items disappear or render incorrectly while scrolling. Never blanks. e. Dismiss alert Description Hello, We are currently building our smarttv apps with React Native. check the react-native docs but didn't find a satisfying answer. The problem I'm facing is that I cannot scroll to the end of the list (it jumps back few rows when I try) and I'm ReactNative左滑删除列表. I suspect that 99% of the issues everyone is experiencing with Flatlist are related to this. This repository demonstrates a common yet tricky bug in React Native's FlatList component when dealing with dynamic item heights and asynchronous data fetching or computations. list can be an Object, Array, Map or Set and it will make sure to extract the values. This again contains Tiles made with TouchableHighlight. Tests should exist as samples within RNTester. Configurable viewability callbacks. Like FlatList, its simpler cousin, SectionList takes a I am trying to create a chat in React native using a <Flatlist /> Like WhatsApp and other chat apps, the messages start at the bottom. Single/Multi Select Flatlist. 如果想获取内部 flatlist 的 ref 对象 可以通过 WaterFallList 内部转发的的 flatList 属性 Scroll to index Flatlist example. The Flatlist is working without any issues when having about 20 items, but when we have many items it is NOT always rendering them and not display them at all. The main props of FlatList are compatible Skip to content. If you are passing array of objects then also use matchFieldName prop. But when list become large (even dozens of items on slow Android device) scrolling become unresponsive, compared to just barebone Flatlist. ; Measurement - Might be invoked for size measurement and won't be visible. Seems to be a bug in the ScrollView bouncing feature on iOS (when you over scroll on iOS the ScrollView scrolls past the content and bounces back to the end of the content by default). Optional horizontal mode. Seems like a 🐛 as the small amount of docs that exist for getItemLayout suggest that Find and fix vulnerabilities Codespaces Contribute to vuhoangha/flatlist-fast development by creating an account on GitHub. Please do not take Terms VirtualizedList: The component behind FlatList (React Native's implementation of the 'Virtual List' concept. The FlatList Why we use getItemLayout in flatlist ,how it help to improve performance of a flatlist . Migration and then the replacement of a FlatList is very simple. The bugSolution. getItemLayout is an optional optimization that let us skip measurement of dynamic content if you know the height of items a priori. Even scroll a little distance FlatList will call getItemLayout for whole data, several times, perform bad. Can anyone explain what is happening or know what I am doing wrong? Thank you in advance! getItemLayout: (not entirely sure what this does or An example of an Animated Flatlist. state} to FlatList we make sure FlatList itself will re-render when the state. \n\n\n. pagingEnabled is not related as both with and without it, the scroll speed seems to have the same threshold for sending drag begin/end events. getItemLayout is efficient to use if you have fixed height items, for example: getItemLayout = {(data, index) => ({length: ITEM_HEIGHT, offset: ITEM_HEIGHT * index, index})} GitHub Gist: instantly share code, notes, and snippets. Is there any way to make First and Last item cards center positioned? Also, regarding large amount of data, I've seen provided link but I need a working example of using those Flatlist properties. An infinite scroll flatList example, that act like pagination for long list in react native & typescript. STATUS TYPES Status Description Not Implemented Prop is not implemented for given architecture. memo(List,(curr,next)=>curr. AI Description I have a big FlatList and I am expecting to call onEndReached() when the user scrolls to the end of the list to make queries to my database. getItemLayout is the most efficient, and is easy to use if you have fixed height items, for example: getItemLayout={(data, index) => ( {length: ITEM_HEIGHT, offset: ITEM_HEIGHT * index, index} )} We use FlatList extensively at Facebook, and no complaints of this sort have surfaced internally. getItemLayout is the most efficient, and is easy to use if you have fixed height items, for example: getItemLayout={(data, index) => ( {length: ITEM_HEIGHT, offset: ITEM_HEIGHT * index, index} )} GitHub › Components FlatList. 👆 Swiper component implemented with FlatList using Hooks & Typescript + strict automation tests with Detox - gusgard/react-native-swiper-flatlist You signed in with another tab or window. See deployment for By passing extraData={this. That said there are a few tricks that help to make it faster / lighter Git clone this project and run yarn install to install dependencies Download the Expo Go app if you haven't already Run yarn start and open Expo Go The project should show up <FlatList data={[{key: 'a'}, {key: 'b'}]} renderItem={({item}) => <Text>{item. Create a Flat list that uses a custom getItemLayout method; Set getItemLayout to null after the FlatList is mounted; onViewableItemsChanged stops being called; Expected Results. userInterfaceStyle string The interface style used for the action sheet, can be set The React Native team recently added a bunch of new list components to replace the old ListView, including a dedicated SectionList component. Sorry no snack. Because for the scrollToOffset prop for example, You signed in with another tab or window. \n. 45. import React, {useState, useEffect} from 'react'; I have the same issue, I want to Name Type Description anchor number iPad only option that allows for docking the action sheet to a node. Snack, code example, screenshot, or link to a repository: The issue I am running into is that the items the flatlist renders have a minHeight. onViewableItemsChanged works great for this on initial render + when scrolling through the list. This is a very desirable optimization technique and if your components have dynamic size, and you really Note from the author: I remember struggling using FlatList when I started react native and this repo is an example of it using ScrollView with some clickable progress par footer. Prop Description Type Default activeAnimationOptions Custom animation options. Topics Trending Collections Enterprise Enterprise platform. 支持不定高 item 内部通过布局自动计算 所以 getItemLayout 设置无效; 关于 ref 的支持 默认取到的是 WaterFallList 的 ref 内部包括自定义的属性和 flatlist 实例方法. but after I set removeclippedsubviews for vertical one too It works like a charm! Wow, I may have made a bit of an oversight too. I've recorded a video, and I'm attaching it to the message. js file offers several solutions to mitigate this performance issue:. tsx for an example on how to implement this. Implemented getItemLayout for a large list with dynamic heights in order to scroll outside of the render window with scrollToIndex, but the scrolling starts jumping when scrolling past the midpoint of a large list. for your understanding I fixed it like below. If image source paths are provided via require, images will be rendered for you. memo() Example: export default React. 00 GB Simple example of react native gridview list using react-native native component <FlatList>. A reproducer needs to be in 👆 Swiper component implemented with FlatList using Hooks & Typescript + strict automation tests with Detox - gusgard/react-native-swiper-flatlist getItemLayout is currently hard to compute for SectionLists because it gets called with the same parameters as the FlatList one (index and data). g. react-native-draggable-flatlist is good but it doesn't work when item's sizes are changing. Reproducible sample code <FlatList ref={FlatlistRef} data={feed} windowSize={4} removeClippedSubviews showsVerticalScrollIndicator={false Description I want to scroll to the top of the entire list when I press a button, but I can't get the reference of the default component ScrollView of FlatList. Responsiveness: Application ability to 👆 Swiper component implemented with FlatList using Hooks & Typescript + strict automation tests with Detox - gusgard/react-native-swiper-flatlist Skip to content Navigation Menu I want to show 3 items on screen and scroolling using animation. BigList permit a fast way replacement of the FlatList component using some aliases of props that replace the default props. I used pure component for each row item of the list and implemented a getItemLayout method but the result I have used the FlatList to render section having header city names and inside the section, there is the list of the offices in that city problem I am facing here the section height is not fixed it may change as per the number of offices belongs to some time its empty? and I have to use scrollToIndex and initialScrollIndex methods of the FlatList. . To review, open the file in an editor that reveals hidden . for the original snack example, you can just add getItemLayout={(d, index) => ({length: 58, offset: 58 * index, index})} since all I have reviewed the documentation I have searched existing issues I am using the latest React Native version <Flatlist> horizontal true component does not work properly on Rtl devices, it renders the items again and jumps to head of list getItemLayout is an optional optimization that let us skip the measurement of dynamic content if you know the height of items ahead of time. Reproduction Steps and Sample Code I tried the following, but doen't Create Flatlist and render absolute positioned items. Maybe the issue has been fixed in a recent release, or perhaps it is not affecting a lot of people. After some more digging, it is caused by Description AnimatedFlatList's scroll and drag performance seems poor. ) Memory consumption: How much information about your list is being stored in memory, which could lead to a app crash. 5 centered in the middle. getItemLayout is the most efficient, and is easy to use if you have fixed height items, for example: getItemLayout={(data, index) => ( {length: ITEM_HEIGHT, offset: ITEM_HEIGHT * index, index} )} it works, I just only set removeclippedsubviews for horizontal flatlist. Note that useNativeDriver will be enabled by default and that opacity's easing will always be kept linear. After implementing PureComponent I passed the FlatList the getItemLayout prop and the onViewableItemsChange callback stops firing off entirely. Find and fix vulnerabilities Actions. Hello again, I welcome each and everyone of you. index===next. Without setting this prop, FlatList would not know it needs to re-render any items because it is also a PureComponent and Missing Reproducible Example; ℹ️: We could not detect a reproducible example in your issue report. pressing that column, the entire row rerenders and you can see it rerendering, it blinks. You Add E2E Jest Snapshot Tests for FlatList. Contribute to zhoujs14/SwipeFlatList development by creating an account on GitHub. The issue with that is, the flatlist needs to implement a function to calculate the offset for every element. I have scrollViews a horizontal FlatList and your experience would suggest that they should have removeClippedSubviews set to false too. Possible causes: improper keyExtractor, getItemLayout, or data manipulation. myFlatList. GitHub community articles Repositories. getItemLayout is the most efficient, and is easy to use if you have fixed height items, for example: getItemLayout={(data, index) => ( {length: ITEM_HEIGHT, offset: ITEM_HEIGHT * index, index} )} Description When you set the property numColumns in the new FlatList and then rerender a column when eg. I cant think of a way to pre-render the flatlist and get the height of every item in it. Thanks in advance. getItemLayout is an optional optimizations that let us skip measurement of dynamic content if you know the height of items a priori. So you need initialNumToRender. Made with random user api If you want to see how is work, you should definitely check video at below Finding basic, simple and useful code it can be pain in the ass, sometimes! I have a FlatList has two required props, list and renderItem. You should be able to set getItemLayout to null or undefined on the fly while using onViewableItemsChanged. Topics Trending Collections Enterprise the height of this new item is calculated outside of the viewport and will be used later on in the getItemLayout function. I think it is a bug of flatlist. Note: Cannot scroll to locations outside the render window without specifying the getItemLayout prop. It's using measure functions which doesn't work perfectly on react-native, lot of unsolvable bugs (especially on android). Removing removeClippedSubviews and getItemLayout has fixed this for me but causes performance problems. It may be possible this type of issue occurs with a particular navigation library, for example. Run on device: Items are visible on iOS but not Android. or `getItemLayout` can be provided for a perf boost and smoother `scrollToIndex` and scroll bar behavior. com I welcome each and everyone of you. See ShowActionSheetButton. Opening a new issue with more information Example to demonstrate use of FlatList to include Sticky Headers using NativeBase components - GeekyAnts/native-base-example-flatlist-stickyHeaders The proposed solution wasn't working in my case. Fully Cross-platform bounces (iOS & Android). We are having an example with 80 items and sometimes is rendering all of them but most of the times is rendering about 40. getItemLayout={getItemLayout} Well regarding @wandrzejczak answer I did not try to compile it to production mode will check that later. FlatList abstraction which uses react-window on the web to create better list performance - web-ridge/react-native-ridge-list GitHub community articles Repositories. Automate any workflow Codespaces. <FlatList data={[{key: 'a'}, {key: 'b'}]} renderItem={({item}) => <Text>{item. Without setting this prop, FlatList would not know it Description. To compute the item layout for a row, we have to manually add up the height for everything that comes before it, including section headers and separators. expo. Alternatively, you can provide an array of elements such a basic test example app that uses react-native-draggable-flatlist - hdsenevi/react-native-draggable-flatlist-example React-Native-Flatlist-Pagination-Example Pagination and Pull to refresh example with rn-placeholder. If all your list item components have the same height (or width, for a horizontal list), passing this prop removes the need for your FlatList to dynamically calculate it every time. 4 (Expo SDK 36) Steps To Reproduce. You can see in the <FlatList Description I request server for data 10 items at a time and render those in a FlatList component. Attaching an example link only for depicting the flatlist configuration we use. key}</Text>} /> More complex example demonstrating PureComponent usage for perf optimization and avoiding bugs. index) thank you for responding! Multi-column SectionList using FlatList. You signed out in another tab or window. Listed movies images using fetch api Flat list gridview implementation HOW CAN I HANDLE MUCH DATA IN REACT NATIVE FLATLIST? Is there anyone who can offer an example using React Native Flatlist's ScrollToIndex? I am working with ScrollToIndex and getItemLayout but it's not working. getItemLayout is the most efficient, and is easy to use if you have fixed height items, for example: getItemLayout={(data, index) => ( {length: ITEM_HEIGHT, offset: ITEM_HEIGHT * index, index} )} But when list become large (even dozens of items on slow Android device) scrolling become unresponsive, compared to just barebone Flatlist. Likely related if the issue is with VirtualizedList: #31163. It only displays some of the items in the list according to which items are currently visible. By binding the onPressItem handler, the props will remain === and PureComponent will prevent wasteful re-renders unless the actual id , selected , or title Same issue my side. All of them should be replaced with their related props of BigList (recommended). If the list items all have same height, I have another solution that works even on long lists. 2 CPU: (8) x64 Intel(R) Core(TM) i7-4770HQ CPU @ 2. Highly customize Refreshing and Loading. During scroll performance was not good but if I was dragging slowly, ui thread performance Missing Reproducible Example; ℹ️: We could not detect a reproducible example in your issue report. I expect absolute positioned Scroll to FlatList item 200; Observe the position of the orange line in comparison to the top of the screen. useMemo and React. dev/2k0tEfYLF Scroll to index Flatlist example. Instant dev environments You signed in with another tab or window. A partial function that accepts the listItemHeight and returns the function expected by React Native FlatList's getItemLayout prop. More complex, selectable example below. Listed movies images using fetch api; Flat list gridview implementation By passing extraData={this. You can ignore this in analytics. getItemLayout = (data, index) => ( { length: 50, offset: 50 * index, index } getColor(index) { const mod = index%3; return COLORS[mod]; scrollToIndex = () => { let randomIndex = A regular sectionlist crashes if the list is huge and getItemLayout() is not implemented while calling scrollToLocation() implementing getItemLayout() is difficult if the how to use scrollToItem in FlatList component, not Button. getItemLayout is an optional optimization that allows skipping the measurement of dynamic content if you know the size (height or width) of items ahead of time. Is this a bug report? Yes Have you read the Bugs section of the Contributing to React Native Guide? Yes Environment react-native: 0. expect to get receive the same event info as for other indexes. As you can see I am simply adding a static number for the Automate any workflow Packages getItemLayout is an optional optimization that let us skip measurement of dynamic content if you know the height of items a priori. renderItem} initialNumToRender Provide the getItemLayout prop so the list doesn't have to rely on async layout data (you should do this whenever possible anyway for better perf). Contribute to ashrithks/react-native-selectable-flatlist development by creating an account on GitHub. The optimizations work best when the height is constant. Expected Results. Many have different sizes. Below is the code--as well as a screenshot--when the FlatList doesn't have the "horizontal" prop Migrate from FlatList. Navigation Menu Toggle navigation I wanted to use an animated Flatlist to extract the scroll offset and use it to hide and show my header, but i got an error: Invariant violation: element type is invalid: expect a string or class/function but got undefined. ; target (string) FlashList may render your items for multiple reasons. Topics Trending you are required to provide the getItemLayout; inverted FlatList always reverse scroll on Mac devices but don't understand other scroll behaviours in Description. Should the height of the ListHeaderComponent be included in the getItemLayout offset? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Sign in Product GitHub Copilot. Scrollabale form using React Native FlatList and ScrollTo method Description It seems that there is a bug on the react-native flatlist while trying to render a list of items. Above the FlatList I have a button and when I tap this button with 230 items loaded in the FlatList, the performance gets horrible. If your needs are simple, like carousel and you want to avoid adding a new dependency, use the FlatList component with the pagingEnabled property. Name Type Description; icons: array of required images or icons: Show icons to go along with each option. Without setting this prop, FlatList would not know it needs to re-render any items because it is also a PureComponent and React Native example of a selectable (clickable) FlatList - App. After fetching the messages from my API, I call this. getItemLayout. Reproduction Steps and Sample Code React Native FlatList rendering issues with large datasets. Remove position: absolute, items appear on Android. I'm just using opacity and scale property for animation with interpolation. I'm using a Smartphone ASUS Name Type Default Required Description; data: array: YES: Expects array of strings. React Native- Slider with FlatList. getItemLayout is the most efficient, and is easy to use if you have fixed height items, for example: getItemLayout={(data, index) => ( {length: ITEM_HEIGHT, offset: ITEM_HEIGHT * index, index} )} getItemLayout. Using this approach instead of a flexWrap layout can prevent conflicts with the item height logic. ; windowSize: Adjusting this value can significantly impact rendering My name is Youssef el habchi, from rn-master. but during scrolling, something goes wrong, and the list jumps to a certain place. The orange line should always be shown at the top of the screen (except when scrolled to the very bottom) Snack, code example, screenshot, or link to a repository: https://snack. But I have a solution that may be a bit slow: You can use scrollToIndex, but when your item is rendered . The props compatibles are listed on Props List. Everything is working fine in the emulator but when I build the app in device and scroll up and down very fast the application crashes. GitHub Gist: instantly share code, notes, and snippets. This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. getItemLayout={(data, index) => ( {length: ITEM_HEIGHT, offset: FlatList displays sticky headers underneath list items when the following conditions are met:. using expo and react native - Mazahir26/react-native-animated-flatlist You signed in with another tab or window. getItemLayout} From some quick testing, it looks like the scroll speed at which point the drag events are triggered is higher for the getItemLayout case, compared to the case without it. expo project, flat list doesn't seem to be supported. In this article, we will go through the process of making a example react native flatlist. I cannot use getItemLayout because I don't know the height of each row (nor the previous ones) to be able to calculate. A reproducer needs to be in A performant interface for rendering simple, flat lists, supporting the most handy features: Fully cross-platform. API response is fast so I have added delay for visualization purposes. React Native Environment Info: System: OS: macOS 10. js This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. That is to scroll to a specific coordinates instead: By passing extraData={this. Sometimes only some of the list items are displayed. Either way, we're automatically closing issues after a period of inactivity. 61. keyExtractor} listKey={listKey} legacyImplementation={false} renderItem={this. A performant interface for rendering simple, flat lists, supporting the most handy features: Fully cross-platform. 20GHz Memory: 223. Please provide either: If your bug is UI related: a Snack; If your bug is build/update related: use our Reproducer Template. 26 MB / 16. <> <FlatList data={data} getItemLayout={this. 1 Steps to Reproduce (Write your steps here:) Made a horizontal flatlist with Description I have a big FlatList and I am expecting to call onEndReached() when the user scrolls to the end of the list to make queries to my database. Scroll to index Flatlist example. They can be of different heights, but the height should be static. #20467 is closed by bot. ; getItemLayout: This prop enables FlatList to optimize initial rendering and scrolling. The positions (x and y) are not calculated properly. There are 185 items on my flatlist and Hi there! This issue is being closed because it has been inactive for a while. If adding keyExtractor doesn't help, try wrapping your List component with React. - Bug I don't see that you have define keyExtractor property. Cell - This is for your list item. mzrqko jsxbr wzi ctuijpqp qost nteul roie sbrn nfslz knffzzb