infinite-scroll | ZTM VanillaJS : using the Unsplash API | Frontend Framework library
kandi X-RAY | infinite-scroll Summary
kandi X-RAY | infinite-scroll Summary
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QUESTION
How to convert Fetch to Axios and Class component to Functional component?
I want to learn to implement Infinite-Scrolling using functional component and axios in React native, but it is difficult to apply because the reference document is composed of class component and fetch.
...ANSWER
Answered 2021-May-30 at 04:51When converting from a class to a function component, there are a few steps which are relevant here:
- replace lifecycle events like
componentDidMount
withuseEffect
. - replace component state with one or many
useState
hooks. - convert class methods to plain functions.
- remove all references to
this
. - delete
render()
and justreturn
the JSX directly.
The methods _renderItem
, _getData
, and _handleLoadMore
are basically unchanged. They just become const
variables instead of class properties.
Here's the straight conversion from class to function component:
QUESTION
I have this line of code in almost every component file where I have subscribe to an observable returning from singleton service file.
destroy$ : Subject = new Subject()
ANSWER
Answered 2021-May-21 at 15:20try to use a boolean, so onDestroy you cast this.destroy$.next(true). i'm following this guide
https://www.digitalocean.com/community/tutorials/angular-takeuntil-rxjs-unsubscribe
QUESTION
I'm using react - redux environment for my web app and I'm not able to make an inifinite scroll, Once i reach the bottom, I'm getting an error that useEffect cannot be used. Here is the code below:
...ANSWER
Answered 2021-May-24 at 03:22You cannot call useEffect
inside of another function because this breaks the rules of hooks. But the useEffect
isn't doing anything here. You could just call fetchHomePosts(skipper+10)
from morePosts()
.
That would load the second page. If you want to load the third and the fourth and so on then you need to make skipper
a state rather than a var
. Add 10
to skipper
whenever you load a page.
You can either:
- Increment
skipper
and callfetchHomePosts()
in yourmorePosts()
function. - Increment
skipper
in yourmorePosts()
function and callfetchHomePosts()
from auseEffect
hook which hasskipper
as a dependency so that the effect runs whenever the value ofskipper
changes. - Save the last fetched page number in your Redux store.
- Base the offset on the length of the
homePosts
array.
You don't need to use useDispatch
and connect
. They are two ways of doing the same thing so you should use one or the other. The hooks are the recommended approach.
This is not perfect but I don't want to overcomplicate things:
QUESTION
I'm new to react native and currently struggling with an infinite scroll listview. It's a calendar list that need to change depending on the selected company (given as prop). The thing is: the prop (and also the myCompany
state are changed, but in the _loadMoreAsync
method both prop.company
as well as myCompany
do hold their initial value.
ANSWER
Answered 2021-May-16 at 09:21Google for useEffect stale closure.
When the function is called from useEffect, it is called from a stale context - this is apparently a javascript feature :) So basically the behavior you are experiencing is expected and you need to find a way to work around it.
One way to go may be to add a (optional) parameter to _loadMoreAsync that you pass from useEffect. If this parameter is undefined (which it will be when called from other places), then use the value from state.
QUESTION
I have managed to create a seamless looping page similar to this: Continuous Looping Page (Not Infinite Scroll)
But instead of looping from end of page to top of page, I am looping within two div ID's, question referenced here:Endless looping page
And the loop solved with this: https://codepen.io/akmalmo/pen/YzNggJR
...ANSWER
Answered 2021-May-07 at 09:28let prev_pos = $(document).scrollTop();
let loopstart_reached = false;
const loopend = $('#loop-end').offset().top;
const loopstart = $('#loop-start').offset().top;
$(document).on('scroll', function() {
// if we scrolled past the loopstart element then we can iterate through
if(loopstart_reached){
// the current Y position is less or equal to the previous position, this means we are scrolling upwards
if(prev_pos <= $(document).scrollTop()){
if ( $(document).scrollTop() >= loopend ) {
$(document).scrollTop($('#loop-start').offset().top)
}
}
// else we are scrolling downwards
else{
if ( $(document).scrollTop() <= loopstart ) {
$(document).scrollTop($('#loop-end').offset().top)
}
}
}
// store the new Y scroll pos
prev_pos = $(document).scrollTop();
// check if we reached the loopstart position
if(prev_pos >= loopstart){
loopstart_reached = true;
}
});
QUESTION
I'm using react-infinite-scroll-component in a project and it works fine outside a Dialog. When I scroll to the bottom of a page, the next set of data is fetched from the server but I can't get the same action inside my Material-UI Dialog.
Here's the Dialog code:
...ANSWER
Answered 2021-Jan-01 at 19:31I was able to fix this by adding the scrollableTarget
prop to the DialogContent like this:
QUESTION
- I am working with ngb-datepicker which is working fine if no initial values or predefined values are set but when trying to use it formControlName or with [(ngModel)] with an existing predefined value the predefined or initial value is not setting on the redenied view. Imagine this as a scenario of editing a form or record with prefilled values. Other formControls with text and numbers are working as intended.
- I am using NgbStruct Model but still not working.
- I tried and debugged the code the value are getting assigned to the form control in a patchValue method and in the format of NgbStruct but not seen in the rendered view
- I tried to implement similar scenario in example provided in stack blitz by ng-bootstrap it is working fine there
Package.json file
...ANSWER
Answered 2021-Apr-27 at 12:29Actually there is no issue in the code this issue was being faced due to custom NgbDateAdapter which was provided in the core.module.ts which was imported in app.module.ts which was interrupting the default "fromModel" method of NgbDateAdapter with custom method. Actually I was unaware of this was being done as I was using #JHIPSTER form my project and this was done by jhipster datePickerUtility
QUESTION
ANSWER
Answered 2021-Apr-02 at 13:26All the plugins are loaded before the Vue instance is ever created and available globally. One solution would be to load any of those packages in specific components rather than on a global level if you don't need them everywhere.
Not sure what can be optimized beyond this.
Also, from this page: https://nuxtjs.org/docs/2.x/configuration-glossary/configuration-plugins
ssr: false will be adapted to mode: 'client' and deprecated in next major release
So, you should not have any ssr
in your plugins
array.
QUESTION
I have a function that fetches and dispays data. I need this function to be called twice, once when the page loads and when InfiniteScroll calls it. The problem is that when getData is called by useEffect it goes on forever.
Code:
...ANSWER
Answered 2021-Apr-03 at 18:06Try to change your useEffect like this
QUESTION
I have an issue with a function which loads posts with the ionic infinite scroll component. The function works great on other components but in this one, the view doesn't update when I push new posts into the array.
This is the function that doesn't work:
...ANSWER
Answered 2021-Apr-02 at 16:37You are missing the return
keyword.
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