Flatlist not rerendering

GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. Hi, I am using React-Native 0. I have updated the issue description. Its so weird.

But it seems like converting my observable object to toJS made my FlatList to re-render again React black magic. Is it because the toJS is inside the render and any changes to the object which gets converted with toJS is triggering the render again? This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs or questions. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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flatlist not rerendering

This comment has been minimized. Sign in to view. The update property seems not relevant for the flat list it is used nowhere so that seems to behave as expected.

On vr 10 nov. Closed for inactivity after answer has been provided. Yes Op ma 17 dec. Sign up for free to subscribe to this conversation on GitHub. Already have an account? Sign in. Linked pull requests. You signed in with another tab or window. Reload to refresh your session.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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Sign in to your account. Hi, I have a checkbox which is hidden in the right part of the item of FlatList, and when I do a longPress at the Item, the checkbox is supposed to show as it's state has set to true. In briefwe can not change the Item style of the FlatList once we render it.

I just found out that if we want the FlatList to know the data change outside of the data prop,we need set it to extraData, so I do it like this now:. I am running into a similar issue with having checkboxes inside FlatList. But now, when I select one checkbox, all of the checkboxes are selected. Did you run into this similar issue? Did you resolve it? If so, how? But its reloading entire table, want to reload, perticular cell.

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Sign up. New issue. Jump to bottom. Can not render item of FlatList when state changed. Labels Resolution: Locked. Copy link Quote reply. This comment has been minimized. Sign in to view. Symous closed this May 23, TamojitPalGit shouldComponentUpdate is working as it should for me.

Try setting data:[] in your handleRefresh function. That worked for me. Sign up for free to subscribe to this conversation on GitHub.

Already have an account? Sign in. Resolution: Locked. Linked pull requests. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Any idea about that?Default renderer for every item in every section. Can be over-ridden on a per-section basis. Should return a React element. The actual data to render, akin to the data prop in FlatList. A marker property for telling the list to re-render since it implements PureComponent.

If any of your renderItemHeader, Footer, etc. How many items to render in the initial batch. This should be enough to fill the screen but not much more. Note these items will never be unmounted as part of the windowed rendering in order to improve perceived performance of scroll-to-top actions. Rendered in between each item, but not at the top or bottom. Used to extract a unique key for a given item at the specified index. Key is used for caching and as the React key to track item re-ordering.

The default extractor checks item. Note that this sets keys for each item, but each overall section still needs its own key. Rendered when the list is empty. Can be a React Component Class, a render function, or a rendered element. Rendered at the very end of the list.

Rendered at the very beginning of the list. Called once when the scroll position gets within onEndReachedThreshold of the rendered content. How far from the end in units of visible length of the list the bottom edge of the list must be from the end of the content to trigger the onEndReached callback.

Thus a value of 0.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Already on GitHub? Sign in to your account. We are using FlatList to render Message Items and after the Flatlist has been rendered we are using scrollToBottom to go to the last item. 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. We are having an example with 80 items and sometimes is rendering all of them but most of the times is rendering about No it does not render at all.

But it is doing the following when is not rendering all items, it shows a white space but when i touch it, it aligns properly to the last item but the rest not rendered and never shown. I solved my problem: Never mutate or map over your props for list items. There is a HUGE performance difference when you implement a customized shouldComponentUpdate function with each of your entries - assuming they are various React Components you are rendering. This issue has been automatically marked as stale because it has not had recent activity.

It will be closed if no further activity occurs. Maybe the issue has been fixed in a recent release, or perhaps it is not affecting a lot of people. If you think this issue should definitely remain open, please let us know why. Thank you for your contributions.

Hi, I'm running react-native v0.

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Will this be fixed? I am having a similar issue, but not even on large lists, sometimes it just only renders partial rows, and the rest of the data are all just blank which you can clearly see that the list left some blank space for the rest of the data, but just not rendering them. This just happens sometimes, most of time it works perfect, very hard for me to find out where excatly went wrong. It does seem to render, the jumping of next batch being rendered is visible but at some point it just cuts off.

The space is reserved but nothing is visible. In fact, inspecting it react views shows the space.React Native enables you to use the same programming language and mental model you use to write web applications to create great native mobile experiences. One of the most common UI features in a mobile app is the scrollable list.

With these tools, you can build great user experiences without introducing complicated, hard-to-maintain UI or data management code. It has all of the features you need to build a great native list view, with all of the bells and whistles users expect: Infinite scroll pagination, pull to refresh, and smooth rendering performance. Getting a basic list displayed is simple, but how do you take advantage of all of these nice features I just mentioned?

Well, it can be helpful to have a data loading library that makes loading state, refetching, and pagination easy. In addition to doing a lot of helpful bookkeeping, Apollo also adds a lot of useful information and methods to the prop it passes down. Pull to refresh is the feature that enables you to pull down on the top of a list view to get fresh data. Adding this is almost as simple as pull to refresh above. Then, we use a simple concat to add the items to the end, and they show up in the UI seamlessly!

We want to enable product developers to spend less time managing data and more time building a great application. Because Apollo Client includes critical boilerplate-reducing features such as network status tracking, refetching, pagination, caching, and more, building a fully-functional list view in React native on top of your GraphQL API is just a few lines of code, and that leaves you with a lot less code to worry about and maintain.

Read more by Sashko Stubailo.

Building a great scrollable list in React Native with FlatList

Become an Apollo insider and get first access to new features, best practices, and community events. Oh, and no junk mail. Frontend How-to. Pull to refresh Pull to refresh is the feature that enables you to pull down on the top of a list view to get fresh data. Written by Sashko Stubailo. Stay in our orbit!To render multiple columns, use the numColumns prop.

Using this approach instead of a flexWrap layout can prevent conflicts with the item height logic. Provides additional metadata like index if you need it, as well as a more generic separators. For simplicity, data is a plain array. If you want to use something else, like an immutable list, use the underlying VirtualizedList directly. Rendered in between each item, but not at the top or bottom. By default, highlighted and leadingItem props are provided.

Rendered when the list is empty.

SectionList

Can be a React Component Class, a render function, or a rendered element. Rendered at the bottom of all the items. Rendered at the top of all the items. A marker property for telling the list to re-render since it implements PureComponent. If any of your renderItemHeader, Footer, etc. Adding getItemLayout can be a great performance boost for lists of several hundred items. Remember to include separator length height or width in your offset calculation if you specify ItemSeparatorComponent.

How many items to render in the initial batch. This should be enough to fill the screen but not much more. Note these items will never be unmounted as part of the windowed rendering in order to improve perceived performance of scroll-to-top actions.

Instead of starting at the top with the first item, start at initialScrollIndex. This disables the "scroll to top" optimization that keeps the first initialNumToRender items always rendered and immediately renders the items starting at this initial index.

Requires getItemLayout to be implemented. Used to extract a unique key for a given item at the specified index. Key is used for caching and as the react key to track item re-ordering.

The default extractor checks item. Items should all be the same height - masonry layouts are not supported.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. When using FlatList, rows are not displayed though renderItem is called. Rows appear immediately when scroll is triggered on the list.

React JS Tutorials for Beginners - 11 - Updating State and Removing Components

Related I can't reproduce with your example. We're also seeing this issue. Looks like it could be something to do with the FlatList being in a navigator on iOS. Managed to reproduce it in a standalone project.

flatlist not rerendering

You'll have to excuse the code it's a bit rough. Once launched, tap on A. Tap remove. Tap back. Then you'll need to scroll to get FlatList to re-render. We found this on RN0. Seems to work as expected on android. Sounds like the issue might be related to the navigator which would explain why we don't see this problem at Facebook.

Thomas sahrens I am using react-navigation for your information. I'm running an experiment in production soon to see the effect on scroll perf. If the hit isn't too bad, we'll turn it off by default. Running into a similar problem here. It isn't exactly scrolling that's my problem though. What I have is a horizontal FlatList with paging enabled. I have a function that adjusts each item of the list to the width of the screen. What I'm doing right now is using redux and async storage to persist all my items, but the items do not render until I hit a button in my view to add another item in the list.

flatlist not rerendering