react-list | : scroll : A versatile infinite scroll React component | Frontend Framework library
kandi X-RAY | react-list Summary
kandi X-RAY | react-list Summary
:scroll: A versatile infinite scroll React component.
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QUESTION
If I understand correctly, if a unique key is provided to each list item, whenever we add new or delete existing items, the remaining ones will be re-rendered. However, I am using a unique key for the Item element and when I click the Add button, I am still seeing the render string (I added a console.log() in the Item component) been printed in console X number of times (x equals the number of total list items).
The complete code is as below:
...ANSWER
Answered 2022-Apr-04 at 03:40Keys don't prevent children from re-rendering - rather, they allow for more efficient "reconciliation", by changing only the underlying DOM node that matches that key when needed. The child will still re-render in React regardless, but if the rendering of the child results in different markup, the key will be used to efficiently determine which DOM element(s) corresponding to that key needs to be changed, rather than changing everything.
If you want to prevent re-rendering, that requires a different tool - React.memo
often works for individual components. For dynamic lists like these though, you can put the component into state.
QUESTION
I have a React app where i use axios to get a list of 200 Todos from a free online REST API with fake data (https://jsonplaceholder.typicode.com/todos). My app has one input that you can search/filter for titles of todos and a select/filter that you can choose true or false for the completed todos. My problem is that i have implement a custom pagination that works well only with the default list of todos, so without filtering the list. For example, if you type in input search the word "vero" you must click in page "2" so you can see existing todo card. Same with select, if you select "true" you can see only 3 cards in the 1st page, but if you click in 2nd page you can see more etc. I have tried a lot but i can't make it work as i want. How can i implement pagination with filter?
App.js
...ANSWER
Answered 2022-Feb-05 at 10:07I fixed pagination with filter with the help of useMemo hook. The problem was that i was filtering the default array and i wasn't updating the totalTodos with the length of computed todos etc.. Now inside useMemo hook, i compute(filter) the todos first and then i update totalTodos with the length of computed todos.
QUESTION
The entire list gets re-rendered instead of the particular selected list item upon state change
https://codesandbox.io/s/lfgxe (Refer the console to see components that gets rendered)
When the "add to the main array" button is clicked, the array(state) has to get updated and only the particular list item has to be re-rendered. But all the items in the list are re-rendered. I tried passing key prop, memo, callbacks they but didn't work.
Links that I referred to:
App.js:
...ANSWER
Answered 2021-Dec-16 at 13:33You have used useCallback
for buttonClick
that will not redefine the function. But setValues
will update values
state and re-render the whole component. For solving it, you should wrap this list in useMemo
adding a
in the dependency array.
QUESTION
I have little experience in Javascript and React, I need to disable the action buttons in modal while the form is submitting, I've searched the internet and haven't found a solution.
Below is the structure of the project:
Countries list:
...ANSWER
Answered 2021-Aug-25 at 20:03Instead of Wrapping the entire CountryForm with the Popup you can wrap the Form rendered via Formik with the Popup, doing this we will now be able to access the isSubmitting
prop provided by Formik.
QUESTION
I have a list of items on my application and I am trying to create a details page to each one on click. Moreover I am not managing how to do it with useState and useEffect with typescript, I could manage just using componentDidMount and is not my goal here.
On my state, called MetricState
, I have "metrics"
and I have seen in some places that I should add a "selectedMetric"
to my state too. I think this is a weird solution since I just want to be able to call a dispatch with the action of "select metric with id x on the metrics list that is on state".
Here is the codesandbox, when you click on the "details" button you will see that is not printing the name of the selected metric coming from the state: https://codesandbox.io/s/react-listing-forked-6sd99
This is my State:
...ANSWER
Answered 2021-Apr-21 at 07:31On my state, called MetricState, I have "metrics" and I have seen in some places that I should add a "selectedMetric" to my state too. I think this is a weird solution since I just want to be able to call a dispatch with the action of "select metric with id x on the metrics list that is on state".
I agree with you. The metricId
comes from the URL through props
so it does not also need to be in the state. You want to have a "single source of truth" for each piece of data.
In order to use this design pattern, your Redux store needs to be able to:
- Fetch and store a single Metric based on its id.
- Select a select Metric from the store by its id.
I generally find that to be easier with a keyed object state (Record
), but an array
works too.
Your component should look something like this:
QUESTION
I am trying to develop a React application that shows a list of itens using Hooks but an infinite loop is happening. I think the state is not being identified as updated but I cannot tell why.
I have seen at the documentation that it could be the dependencies that I should add on the useEffect function, but when I remove the dependencies on useEffect it solves the problem. Moreover this is not what the documentation recommends to do, they recommend to put all dependencies on the list.
The codesandbox is here: https://codesandbox.io/s/react-listing-forked-6sd99 and if you uncomment the line 30 at Dashboard.ts
you will be able to see the infinite loop, this is the line that calls the dispatch
function (and also codesandbox will freze for some seconds) . Thank you in advance!
The useSelector and UseEffect functions are as below, located at the Dashboard.tsx
file:
ANSWER
Answered 2021-Apr-19 at 23:02The main issue is the catalog
inside [catalog, dispatch]
found here:
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