I'm using Awesome Alert for customize alert but I would like to apply it in functional component environment. This is my design
And this is my code
<AwesomeAlert
show={true}
showProgress={false}
title="AwesomeAlert"
message="I have a message for you!"
closeOnTouchOutside={false}
closeOnHardwareBackPress={false}
showCancelButton={true}
showConfirmButton={true}
cancelText="Reject"
confirmText="Approve"
confirmButtonColor="#AEDEF4"
cancelButtonColor="#DD6B55"
onCancelPressed={() => {
console.log("Reject")
}}
onConfirmPressed={() => {
console.log("Approve")
}}
/>
My question is, is Awesome Alert can only be applied in Class component? How am I able to implement it in Functional Component like the original Alert React Native?
You can use AwesomeAlert inside a functional component as you would inside a class component's render() function; any React component that can be rendered from a class component can also be rendered from a functional component.
Just put it inside your return part of your functional component and it will work
For Example like this:
return (
<View>
<AwesomeAlert
show={true}
showProgress={false}
title="AwesomeAlert"
message="I have a message for you!"
closeOnTouchOutside={false}
closeOnHardwareBackPress={false}
showCancelButton={true}
showConfirmButton={true}
cancelText="Reject"
confirmText="Approve"
confirmButtonColor="#AEDEF4"
cancelButtonColor="#DD6B55"
onCancelPressed={() => {
console.log("Reject")
}}
onConfirmPressed={() => {
console.log("Approve")
}}
/>
</View>
)
Related
I am using Native Base Popover.
scenario
As a user,
I can press on the list,
So that I can select a fruit
My problem is I don't understand how to close the <Popover /> from the outside of the component.
Here is my organization
<Formik>
<Popover>
<FlatList>
<Pressable onPress={() => handlePress(item.id)} /> //Banaba
<Pressable onPress={() => handlePress(item.id)} /> //Potato
<Pressable onPress={() => handlePress(item.id)} /> //Ananas
NativeBase offers a useDisclose() hook for handling opening/closing of modals and other popup windows.
That hook provides an isOpen state (as #mainak's answer mentions) as well as onOpen() and onClose() functions to manipulate that state. You can pass these helpers as arguments as-needed into the props of the same name within the Popover component to handle open/close state.
Optionally, you can in addition pass true or false into useDisclose() to override the starting value of isOpen (defaults to false).
Here is an example below for reference.
import React from "react";
import { Popover, useDisclose } from "native-base";
function MyComponent() {
const { isOpen, onClose, onOpen } = useDisclose()
return (
<>
<Button onPress={onOpen}>Open the Popover</Button>
<Popover isOpen={isOpen} onClose={onClose}>
<Popover.Content>
<Popover.Arrow />
<Popover.CloseButton />
<Popover.Header>My Popover Title</Popover.Header>
<Popover.Body>You can place the content of your popover inside the body.</Popover.Body>
<Popover.Footer>
<Button onPress={onClose} variant="ghost">Cancel</Button>
</Popover.Footer>
</Popover.Content>
</Popover>
</>
)
}
can you try isOpen prop in Popover tag and have it as a state value like
const [isOpen, setOpen] = React.useState(true);
...
<Formik>
<Popover isOpen={isOpen}>
<FlatList>
...
I am using react-native-snap-carousel to swipe through images. When there is like 0-10 images it's working fine, but otherwise it's very laggy. I tried the optimization methods but didn't fix it.
Here is my implementation (selectedItems is the data I have):
const renderItem = useCallback(
({ item, index }) => {
return (
<CarouselImage
ad={ad}
item={item}
index={index}
showImage={showImage}
/>
);
},
[ad, showImage]);
return ad?.videos?.length > 0 || ad?.images?.length > 0 ? (
<View style={styles.container}>
<Carousel
initialNumToRender={selectedItems.length}
maxToRenderPerBatch={5}
ref={carouselRef}
swipeThreshold={5}
itemWidth={wp(375)}
data={selectedItems}
sliderWidth={wp(375)}
enableMomentum={false}
lockScrollWhileSnapping
renderItem={renderItem}
onSnapToItem={(index) => setActiveSlide(index)}
/>
<Pagination
activeOpacity={1}
tappableDots={true}
animatedDuration={100}
inactiveDotScale={0.4}
inactiveDotOpacity={0.4}
carouselRef={carouselRef}
dotStyle={styles.dotStyle}
activeDotIndex={activeSlide}
dotsLength={selectedItems.length}
containerStyle={styles.pagination}
dotContainerStyle={styles.dotContainer}
inactiveDotStyle={styles.inactiveDotStyle}
/>
</View>
Is there something I am missing. Also, is there an alternative library that runs better with large data ?
Try this alternative library: react-native-banner-carousel-updated
I'm using this with more than 20 images and it's works fine.
I'm assuming that the optimization you've tried is what is described in the react-native-snap-carousel library docs...
I too found that every swipe was causing my screen's component to re-render.
You might be thinking...
I think it has to do with the state I am updating each time I scroll the component is re-rendered. Do you have ant idea how to solve this ?
To prevent the re-rendering of your <Carousel ... /> component, the optimization that you want to look at is to utilize React.memo()
Try refactoring your <Carousel ... /> component to a new component file, something like this...
Gallery.js
import React from "react";
import CarouselCardItem, { SLIDER_WIDTH } from "./CarouselCardItem";
import { ALL_RECIPES } from "../config/Recipe/allRecipes";
import Carousel from "react-native-snap-carousel";
const Gallery = ({ carouselRef, selectedItems, setActiveSlide}) => {
console.log("render"); // <== This will render only when props change (ie. the ref - which should not change, or you pass fresh data - in which case you want it to re-render)
return (
<Carousel
initialNumToRender={selectedItems.length}
maxToRenderPerBatch={5}
ref={carouselRef}
swipeThreshold={5}
itemWidth={wp(375)}
data={selectedItems} // <== selectedItems could be passed in as prop, or from app state
sliderWidth={wp(375)}
enableMomentum={false}
lockScrollWhileSnapping
renderItem={renderItem}
onSnapToItem={(index) => setActiveSlide(index)}
/>
);
};
const GalleryMemo = React.memo(Gallery);
export default GalleryMemo;
Then in your screen file, use it
<GalleryMemo carouselRef={carouselRef} selectedItems={selectedItems} setActiveSlide={setActiveSlide}/>
Here is a simplified version of my code.
Notice the setFieldValue_ and this.setFieldValue_ = setFieldValue;
This code works fine, I'm able to get the output when submit button is clicked.
I'm actually wondering if this is the right way to do it? If not, can you point me to the right direction? Also what is this method called? (assigning class variable to some function and use it within another function)
class MyComponent extends React.Component {
setFieldValue_;
someFunction() {
this.setFieldValue_("name", value);
}
render() {
return (
<Formik
initialValues={{
something: ""
}}
onSubmit={values => console.log(values)}
>
{({
setFieldValue,
}) => {
this.setFieldValue_ = setFieldValue;
<ThirdPartyCustomComponent onChange={this.someFunction} />
}}
</Formik>
}
}
I would personally have the onChange simply call formik set field value there and then rather than using different functions. Strictly speaking you don't want to set the value like that because every re-render is setting the value again.
I would also recommend looking at custom formik inputs using the useField hook - https://jaredpalmer.com/formik/docs/api/useField. This will allow you to write a small wrapper around your third party component and formik. Noticing you have used a class based component you may want to do some short reading into react hooks before throwing yourself into using useField.
Docs example:
const MyTextField = ({ label, ...props }) => {
const [field, meta, helpers] = useField(props);
return (
<>
<label>
{label}
<input {...field} {...props} />
</label>
{meta.touched && meta.error ? (
<div className='error'>{meta.error}</div>
) : null}
</>
);
};
I'm passing a render to the Accordion element in native-base using the renderContent prop. The render contains two buttons, which, when pressed, run functions that are local to the current component. Unfortunately those functions are not available once it has been actually rendered.
How do I bind the functions properly so that when pressed, the correct functions are referenced?
I'm using the most modern stable releases of react-native, native-base, and I'm running this through expo for testing.
Here's the documentation on native-base:
http://docs.nativebase.io/Components.html#accordion-custom-header-content-headref
Accordion:
<Accordion
dataArray={ this.state.websites }
renderContent={ this._renderAccordionContent }
/>
renderContent:
_renderAccordionContent(content) {
return (
<Button
onPress={() => this.openSite(content.path)}
>
<Text>Open</Text>
</Button>
<Button
onPress={() => this.editSite(content.key)}
>
<Text>Edit</Text>
</Button>
)
}
When the buttons are pressed, the expected results are that the functions are run.
The actual results are that when the buttons are pressed, these errors are populated:
_this2.openSite is not a function.
_this2.editSite is not a function.
Thank you for any help.
Check out this excellent article that shows several different ways of binding your functions https://medium.freecodecamp.org/react-binding-patterns-5-approaches-for-handling-this-92c651b5af56
Here is an example of binding it in the constructor of your component that uses the Accordion component. It is by no means the only way of binding the functions. The above article gives 5 different ways of doing it.
class MyComponent extends Component {
constructor(props) {
super(props);
this.openSite = this.openSite.bind(this);
this.editSite = this.editSite.bind(this);
}
// I am assuming you have written your functions like this and not as arrow functions
openSite (path) {
...
}
editSite (key) {
...
}
_renderAccordionContent(content) {
return (
<Button
onPress={() => this.openSite(content.path)}
>
<Text>Open</Text>
</Button>
<Button
onPress={() => this.editSite(content.key)}
>
<Text>Edit</Text>
</Button>
)
}
render() {
...
<Accordion
dataArray={ this.state.websites }
renderContent={ this._renderAccordionContent }
/>
...
}
}
I'd like to have a context menu triggered on long press different places using React Native.
I.e. in a dialer like the default dailer. You can long-click on any contact and get a 'copy number' menu. And also you can long-click on the name of the person once you've opened their 'contact card'.
The straight-forward way needs a lot of copy-pasted boilerplate, both components and handlers.
Is there a better pattern for doing this?
All Touchable components (TouchableWithoutFeedback, TouchableOpacity etc.) has a property called onLongPress. You can use this prop to listen for long presses and then show the context menu.
To eliminate code mess and doing lots of copy paste you can separate your context menu as a different component and call it when the long press happen. You can also use an ActionSheet library to show the desired options. React native has a native API for iOS called ActionSheetIOS. If you get a little bit more experience in react and react-native you can create a better logic for this but I'm going to try to give you an example below.
// file/that/contains/globally/used/functions.js
const openContextMenu = (event, user, callback) => {
ActionSheetIOS.showActionSheetWithOptions({
options: ['Copy Username', 'Call User', 'Add to favorites', 'Cancel'],
cancelButtonIndex: [3],
title: 'Hey',
message : 'What do you want to do now?'
}, (buttonIndexThatSelected) => {
// Do something with result
if(callback && typeof callback === 'function') callback();
});
};
export openContextMenu;
import { openContextMenu } from './file/that/contains/globally/used/functions';
export default class UserCard extends React.Component {
render() {
const { userObject } = this.props;
return(
<TouchableWithoutFeedback onLongPress={(event) => openContextMenu(event, userObject, () => console.log('Done')}>
<TouchableWithoutFeedback onLongPress={(event) => openContextMenu(event, userObject, () => console.log('Done'))}>
<Text>{userObject.name}</Text>
<Image source={{uri: userObject.profilePic }} />
</TouchableWithoutFeedback>
</TouchableWithoutFeedback>
);
}
}
Similarly as the previous answer combine onLongPress with imperative control for popup menu - something like
<TouchableWithoutFeedback onLongPress={()=>this.menu.open()}>
<View style={styles.card}>
<Text>My first contact name</Text>
<Menu ref={c => (this.menu = c)}>
<MenuTrigger text="..." />
<MenuOptions>
// ...
</MenuOptions>
</Menu>
</View>
</TouchableWithoutFeedback>
When it comes to a lot of boilerplate - in React you can do your own components that you can reuse everywhere thus reducing boilerplate (and copy&paste)
See full example on https://snack.expo.io/rJ5LBM-TZ