I made a variable that has the style which I would want the input box to change to when it is clicked on.
How can I implement it so that when the input box is clicked, the border color of the input box changes to blue, considering that CSS, styles and everything else are imported?
const inputStyle = css
border-color: blue;
;
const InputBox = styled.input
myClick: function () {
inputstyle
}
;
render() {
return (
<InputBox
placeholder='Click Me'
type='text'
onClick={this.myClick}
/>
styled.foo doesn't return a class component, so writing methods as if they're on a class in the template string won't work.
Since you're handling something stateful (was this thing clicked?) you need to have some place to put that state. Then you can pass that state to the InputBox component:
const InputBox = styled.input`
border-color: ${({ clicked }) => clicked ? 'blue' : 'transparent'};
`
class Parent extends React.Component {
constructor (props) {
this.state = { clicked: false }
}
handleClick () {
this.setState({ clicked: true })
}
render () {
return (
<InputBox
placeholder="Click Me"
type="text"
clicked={this.state.clicked}
onClick={this.handleClick}
/>
)
}
}
I'd suggest checking out the "Passed Props" section of the styled-components docs.
you can do this :
const Styles = {
inputNormal:{color:'blue'},
inputClicked:{color:'red'}
}
class Parent extends React.Component {
constructor (props) {
this.state = { clicked: false }
}
handleClick () {
this.setState({ clicked: true })
}
render () {
return (
<InputBox
placeholder="Click Me"
type="text"
style={this.state.clicked?styles.inputNormal:styles.inputClicked}
onClick={this.handleClick}
/>
)}}
You should add styles with variables like this:
class App extends React.Component {
constructor(props) {
super(props);
this.state = {
clicked: false
};
}
myClick = () => {
this.setState({
clicked: true
});
};
render() {
const inputStyle = {
borderColor: "blue"
};
return (
<input
placeholder="Click Me"
type="text"
onClick={this.myClick}
style={this.state.clicked ? inputStyle : null}
/>
);
}
}
Here is a working demo:
DEMO
I pass a React Component as a Prop to a child.
That component has an event.
In child component, I want to get access to that event and bind it to a method inside child. How can I do that ?
I often use Semantic-UI React Modal as following:
class Example extends Component {
constructor(props) {
super(props);
this.state = {
modalOpen: false
}
}
handleOpen = () => this.setState({ modalOpen: true })
handleClose = () => this.setState({ modalOpen: false })
render(){
return(
<Modal
onClose={this.handleClose}
open={this.state.modalOpen}
trigger={<Button onClick={this.handleOpen}>Gandalf</Button>}>
<Modal.Header>Balrog</Modal.Header>
<Modal.Content>
<h1>You shall not pass!</h1>
{/*
Some form that closes Modal on success
onSuccess : this.handleClose
*/}
<Button onClick={this.handleClose}>Grrrrr</Button>
</Modal.Content>
</Modal>
)
}
}
export default Example
Now I want to make it reusable
import React, { Component } from 'react'
import { Modal } from 'semantic-ui-react'
class ReusableModal extends Component {
constructor(props) {
super(props);
this.state = {
modalOpen: false
}
}
handleOpen = () => this.setState({ modalOpen: true })
handleClose = () => this.setState({ modalOpen: false })
render(){
return(
<Modal
onClose={() => this.handleClose}
open={this.state.modalOpen}
{/*
How to access onClick event on trigger prop content ?
this.prop.trigger can be a Button or a Menu.Item
*/}
{...this.props}>
{this.props.children}
</Modal>
)
}
}
How can I have access to the trigger prop Component and bind its onClick event to handleOpen method ?
Edit :
to be more precise here is what I'm looking for
<ChildComponent trigger={<Button>This button should fire a function defined in child component</Button>} />
ChildComponent extends Component {
functionToCall = () => { console.log('hello') }
// I would like to :
// let myButton = this.props.trigger
// myButton.onClick = functionToCall
}
In React, data flows from parent to child. If there are multiple child components that have events that need to trigger changes in parent component you must fire callback function in child component.
Parent component:
handleOpen = () => { // do something }
(...)
<childComponent onClickCallback={this.handleOpen}
And in child component:
<button onClick={this.props.onClickCallback}> Click to close</button>
Pass this.handleOpen as a prop and call it as a prop in child component, and it will trigger function in the parent component, where you can handle data however you want.
Is this what you asked for?
The key here is to clone element
ChildComponent extends Component {
functionToCall = () => { console.log('hello') }
this.Trigger = React.cloneElement(
this.props.trigger,
{ onClick: this.functionToCall }
)
}
I'm developing a React Native application to be deployed as a native application on iOS and Android (and Windows, if possible).
The problem is that we want the layout to be different depending on screen dimensions and its orientation.
I've made some functions that return the styles object and are called on every component render's function, so I am able to apply different styles at application startup, but if the orientation (or screen's size) changes once the app has been initialized, they aren't recalculated nor reapplied.
I've added listeners to the top rendered so it updates its state on orientation change (and it forces a render for the rest of the application), but the subcomponents are not rerendering (because, in fact, they have not been changed).
So, my question is: how can I make to have styles that may be completely different based on screen size and orientation, just as with CSS Media Queries (which are rendered on the fly)?
I've already tried react-native-responsive module without luck.
Thank you!
If using Hooks. You can refer to this solution: https://stackoverflow.com/a/61838183/5648340
The orientation of apps from portrait to landscape and vice versa is a task that sounds easy but may be tricky in react native when the view has to be changed when orientation changes. In other words, having different views defined for the two orientations can be achieved by considering these two steps.
Import Dimensions from React Native
import { Dimensions } from 'react-native';
To identify the current orientation and render the view accordingly
/**
* Returns true if the screen is in portrait mode
*/
const isPortrait = () => {
const dim = Dimensions.get('screen');
return dim.height >= dim.width;
};
/**
* Returns true of the screen is in landscape mode
*/
const isLandscape = () => {
const dim = Dimensions.get('screen');
return dim.width >= dim.height;
};
To know when orientation changes to change view accordingly
// Event Listener for orientation changes
Dimensions.addEventListener('change', () => {
this.setState({
orientation: Platform.isPortrait() ? 'portrait' : 'landscape'
});
});
Assembling all pieces
import React from 'react';
import {
StyleSheet,
Text,
Dimensions,
View
} from 'react-native';
export default class App extends React.Component {
constructor() {
super();
/**
* Returns true if the screen is in portrait mode
*/
const isPortrait = () => {
const dim = Dimensions.get('screen');
return dim.height >= dim.width;
};
this.state = {
orientation: isPortrait() ? 'portrait' : 'landscape'
};
// Event Listener for orientation changes
Dimensions.addEventListener('change', () => {
this.setState({
orientation: isPortrait() ? 'portrait' : 'landscape'
});
});
}
render() {
if (this.state.orientation === 'portrait') {
return (
//Render View to be displayed in portrait mode
);
}
else {
return (
//Render View to be displayed in landscape mode
);
}
}
}
As the event defined for looking out the orientation change uses this command ‘this.setState()’, this method automatically again calls for ‘render()’ so we don’t have to worry about rendering it again, it’s all taken care of.
Here's #Mridul Tripathi's answer as a reusable hook:
// useOrientation.tsx
import {useEffect, useState} from 'react';
import {Dimensions} from 'react-native';
/**
* Returns true if the screen is in portrait mode
*/
const isPortrait = () => {
const dim = Dimensions.get('screen');
return dim.height >= dim.width;
};
/**
* A React Hook which updates when the orientation changes
* #returns whether the user is in 'PORTRAIT' or 'LANDSCAPE'
*/
export function useOrientation(): 'PORTRAIT' | 'LANDSCAPE' {
// State to hold the connection status
const [orientation, setOrientation] = useState<'PORTRAIT' | 'LANDSCAPE'>(
isPortrait() ? 'PORTRAIT' : 'LANDSCAPE',
);
useEffect(() => {
const callback = () => setOrientation(isPortrait() ? 'PORTRAIT' : 'LANDSCAPE');
Dimensions.addEventListener('change', callback);
return () => {
Dimensions.removeEventListener('change', callback);
};
}, []);
return orientation;
}
You can then consume it using:
import {useOrientation} from './useOrientation';
export const MyScreen = () => {
const orientation = useOrientation();
return (
<View style={{color: orientation === 'PORTRAIT' ? 'red' : 'blue'}} />
);
}
You can use the onLayout prop:
export default class Test extends Component {
constructor(props) {
super(props);
this.state = {
screen: Dimensions.get('window'),
};
}
getOrientation(){
if (this.state.screen.width > this.state.screen.height) {
return 'LANDSCAPE';
}else {
return 'PORTRAIT';
}
}
getStyle(){
if (this.getOrientation() === 'LANDSCAPE') {
return landscapeStyles;
} else {
return portraitStyles;
}
}
onLayout(){
this.setState({screen: Dimensions.get('window')});
}
render() {
return (
<View style={this.getStyle().container} onLayout = {this.onLayout.bind(this)}>
</View>
);
}
}
}
const portraitStyles = StyleSheet.create({
...
});
const landscapeStyles = StyleSheet.create({
...
});
Finally, I've been able to do so. Don't know the performance issues it can carry, but they should not be a problem since it's only called on resizing or orientation change.
I've made a global controller where I have a function which receives the component (the container, the view) and adds an event listener to it:
const getScreenInfo = () => {
const dim = Dimensions.get('window');
return dim;
}
const bindScreenDimensionsUpdate = (component) => {
Dimensions.addEventListener('change', () => {
try{
component.setState({
orientation: isPortrait() ? 'portrait' : 'landscape',
screenWidth: getScreenInfo().width,
screenHeight: getScreenInfo().height
});
}catch(e){
// Fail silently
}
});
}
With this, I force to rerender the component when there's a change on orientation, or on window resizing.
Then, on every component constructor:
import ScreenMetrics from './globalFunctionContainer';
export default class UserList extends Component {
constructor(props){
super(props);
this.state = {};
ScreenMetrics.bindScreenDimensionsUpdate(this);
}
}
This way, it gets rerendered everytime there's a window resize or an orientation change.
You should note, however, that this must be applied to every component which we want to listen to orientation changes, since if the parent container is updated but the state (or props) of the children do not update, they won't be rerendered, so it can be a performance kill if we have a big children tree listening to it.
Hope it helps someone!
I made a super light component that addresses this issue.
https://www.npmjs.com/package/rn-orientation-view
The component re-renders it's content upon orientation change.
You can, for example, pass landscapeStyles and portraitStyles to display these orientations differently.
Works on iOS and Android.
It's easy to use. Check it out.
React Native also have useWindowDimensions hooks that returns the width and height of your device.
With this, you can check easily if the device is in 'Portrait' or 'Landscape' by comparing the width and height.
See more here
I had the same problem. After the orientation change the layout didn't change.
Then I understood one simple idea - layout should depend on screen width that should be calculated inside render function, i.e.
getScreen = () => {
return Dimensions.get('screen');
}
render () {
return (
<View style={{ width: this.getScreen().width }>
// your code
</View>
);
}
In that case, the width will be calculated at the moment of render.
** I am using this logic for my landscape and portrait Logic.**
** by this if I launch my app in landscape first I am getting the real height of my device. and manage the hight of the header accordingly.**
const [deviceOrientation, setDeviceOrientation] = useState(
Dimensions.get('window').width < Dimensions.get('window').height
? 'portrait'
: 'landscape'
);
const [deviceHeight, setDeviceHeight] = useState(
Dimensions.get('window').width < Dimensions.get('window').height
? Dimensions.get('window').height
: Dimensions.get('window').width
);
useEffect(() => {
const setDeviceHeightAsOrientation = () => {
if (Dimensions.get('window').width < Dimensions.get('window').height) {
setDeviceHeight(Dimensions.get('window').height);
} else {
setDeviceHeight(Dimensions.get('window').width);
}
};
Dimensions.addEventListener('change', setDeviceHeightAsOrientation);
return () => {
//cleanup work
Dimensions.removeEventListener('change', setDeviceHeightAsOrientation);
};
});
useEffect(() => {
const deviceOrientation = () => {
if (Dimensions.get('window').width < Dimensions.get('window').height) {
setDeviceOrientation('portrait');
} else {
setDeviceOrientation('landscape');
}
};
Dimensions.addEventListener('change', deviceOrientation);
return () => {
//cleanup work
Dimensions.removeEventListener('change', deviceOrientation);
};
});
console.log(deviceHeight);
if (deviceOrientation === 'landscape') {
return (
<View style={[styles.header, { height: 60, paddingTop: 10 }]}>
<TitleText>{props.title}</TitleText>
</View>
);
} else {
return (
<View
style={[
styles.header,
{
height: deviceHeight >= 812 ? 90 : 60,
paddingTop: deviceHeight >= 812 ? 36 : 10
}
]}>
<TitleText>{props.title}</TitleText>
</View>
);
}
I have, by far, had the most success with this library: https://github.com/axilis/react-native-responsive-layout
It does what you are asking for and a lot more. Simple Component implementation without hardly any logic like some of the more complex answers above. My project is using Phone, Tablet, and web via RNW - and the implementation is flawless. Additionally when resizing the browser it's truly responsive, and not just on initial rendering - handling phone orientation changes flawlessly.
Example code (Put any components as children of blocks):
<Grid>
<Section> {/* Light blue */}
<Block xsSize="1/1" smSize="1/2" />
<Block xsSize="1/1" smSize="1/2" />
<Block xsSize="1/1" smSize="1/2" />
</Section>
<Section> {/* Dark blue */}
<Block size="1/1" smSize="1/2" />
<Block size="1/1" smSize="1/2" />
<Block size="1/1" smSize="1/2" />
<Block size="1/1" smSize="1/2" />
<Block size="1/1" smSize="1/2" />
</Section>
</Grid>
To give this:
I have written a HoC solution for my expo SDK36 project, it support orientation change and pass props.orientation based on ScreenOrientation.Orientation value.
import React, { Component } from 'react';
import { ScreenOrientation } from 'expo';
export default function withOrientation(Component) {
class DetectOrientation extends React.Component {
constructor(props) {
super(props);
this.state = {
orientation: '',
};
this.listener = this.listener.bind(this);
}
UNSAFE_componentWillMount() {
this.subscription = ScreenOrientation.addOrientationChangeListener(this.listener);
}
componentWillUnmount() {
ScreenOrientation.removeOrientationChangeListener(this.subscription);
}
listener(changeEvent) {
const { orientationInfo } = changeEvent;
this.setState({
orientation: orientationInfo.orientation.split('_')[0],
});
}
async componentDidMount() {
await this.detectOrientation();
}
async detectOrientation() {
const { orientation } = await ScreenOrientation.getOrientationAsync();
this.setState({
orientation: orientation.split('_')[0],
});
}
render() {
return (
<Component
{...this.props}
{...this.state}
onLayout={this.detectOrientation}
/>
);
}
}
return (props) => <DetectOrientation {...props} />;
}
To achieve a more performant integration, I used the following as a superclass for each of my react-navigation screens:
export default class BaseScreen extends Component {
constructor(props) {
super(props)
const { height, width } = Dimensions.get('screen')
// use this to avoid setState errors on unmount
this._isMounted = false
this.state = {
screen: {
orientation: width < height,
height: height,
width: width
}
}
}
componentDidMount() {
this._isMounted = true
Dimensions.addEventListener('change', () => this.updateScreen())
}
componentWillUnmount() {
this._isMounted = false
Dimensions.removeEventListener('change', () => this.updateScreen())
}
updateScreen = () => {
const { height, width } = Dimensions.get('screen')
if (this._isMounted) {
this.setState({
screen: {
orientation: width < height,
width: width, height: height
}
})
}
}
Set any root components to extend from this component, and then pass the screen state to your leaf/dumb components from the inheriting root components.
Additionally, to keep from adding to the performance overhead, change the style object instead of adding more components to the mix:
const TextObject = ({ title }) => (
<View style={[styles.main, screen.orientation ? styles.column : styles.row]}>
<Text style={[styles.text, screen.width > 600 ? {fontSize: 14} : null ]}>{title}</Text>
</View>
)
const styles = StyleSheet.create({
column: {
flexDirection: 'column'
},
row: {
flexDirection: 'row'
},
main: {
justifyContent: 'flex-start'
},
text: {
fontSize: 10
}
}
I hope this helps anyone in the future, and you'll find it to be quite optimal in terms of overhead.
I'm using styled-components, and this is how I re-render the UI on orientation change.
import React, { useState } from 'react';
import { View } from 'react-native';
import { ThemeProvider } from 'styled-components';
import appTheme from 'constants/appTheme';
const App = () => {
// Re-Layout on orientation change
const [theme, setTheme] = useState(appTheme.getTheme());
const onLayout = () => {
setTheme(appTheme.getTheme());
}
return (
<ThemeProvider theme={theme}>
<View onLayout={onLayout}/>
{/* Components */}
</ThemeProvider>
);
}
export default App;
Even if you're not using styled-components, you can create a state and update it on onLayout to re-render the UI.
This is my solution:
const CheckOrient = () => {
console.log('screenHeight:' + Dimensions.get('screen').height + ', screenWidth: ' + Dimensions.get('screen').width);
}
return ( <
View onLayout = {
() => CheckOrient()
} >
............
<
/View>
Note for the case with a pure component. #mridul-tripathi answer works correctly, but if a pure component is used, then probably only parent/top-level component reacting to orientation change is not enough. You will also need to update a pure component separately on orientation change.
All you need is:
import { useWindowDimensions } from 'react-native';
export default function useOrientation() {
const window = useWindowDimensions();
return window.height >= window.width ? 'portrait' : 'landscape';
}
You need useWindowDimensions
This hook re-render component when dimension change and apply styles but Dimensions object can't re-render component and change style, it just work in first render
import { useWindowDimensions } from 'react-native';
then destructure it
const { height, width } = useWindowDimensions();
and final you can do like this
import React from "react";
import { View, StyleSheet, useWindowDimensions } from "react-native";
const App = () => {
const { height, width } = useWindowDimensions();
const isPortrait = height > width;
return (
<View style={isPortrait ? styles.portrait : styles.landscape}>
{/* something */}
</View>
);
};
const styles = StyleSheet.create({
portrait: {},
landscape: {},
});
export default App;
also you can use scale property
const { scale } = useWindowDimensions();
read this document
https://reactnative.dev/docs/usewindowdimensions
We are trying to inject dynamic children into a react app that is using React-Redux and Redux, and are experiencing an issue with the binding on the children props. I've distilled the problem into the following example code (JSFiddle). The issue is that the original rendered element updates just fine, but the dynamically injected portion does not. The strange thing is that the update is picked up in the redux store, and is fed to the props correctly.
const initialState = {
renderProperty: "Red Fish",
getChildrenProperty: "Blue Fish",
}
function MainReducer(state = initialState, action) {
switch (action.type) {
case 'PROBLEM_CHILD_INSIDE_RENDER':
return Object.assign({}, state, {
renderProperty: action.mutatedProperty
})
case 'PROBLEM_CHILD_INSIDE_GET_CHILDREN':
return Object.assign({}, state, {
getChildrenProperty: action.mutatedProperty
})
default:
return state
}
}
const store = Redux.createStore(MainReducer);
function mapStateToProps(state) {
return {
renderProperty : state.renderProperty,
getChildrenProperty : state.getChildrenProperty
}
}
function mapDispatchToProps(dispatch) {
return {
actions: Redux.bindActionCreators(actionCreators, dispatch)
};
}
class ProblemChild extends React.Component {
constructor() {
super();
this.childrenInjected = false;
this.state = {children: null};
}
/**
* Add children in setDynamicChildren() versus within render()
*/
componentDidMount() {
this.setDynamicChildren();
}
setDynamicChildren() {
this.setState({
children: this.getChildren()
});
}
getChildren() {
var me = this;
console.log(this);
return (
<div>
<br/>
<button style={{marginBottom: '10px'}}
onClick={me._handleGetChildrenAction.bind(me)} >UI State Change Action for prop in getChildren()</button>
<br/>
<span>prop in getChildren(): <b>{me.props.getChildrenProperty}</b></span>
</div>
)
}
render() {
var me = this,
childrenInjected = me.childrenInjected;
console.log(this.props);
if(me.state.children && !me.childrenInjected) {
return (
<div >
<button style={{marginBottom: '10px'}}
onClick={me._handleRenderAction.bind(me)} > UI State Change Action for prop in render()</button>
<br/>
<span>prop in render(): <b>{me.props.renderProperty}</b></span>
<br/>
{this.state.children} <br/>
</div>
)
}
else {
return (
<div>placeholder, yo</div>
)
}
}
_handleRenderAction() {
var me = this;
store.dispatch(actionForPropInsideRender('One Fish!'));
}
_handleGetChildrenAction() {
var me = this;
store.dispatch(actionForPropInsideGetChildren('Two Fish!'));
}
}
ProblemChild = ReactRedux.connect(mapStateToProps,mapDispatchToProps)(ProblemChild);
function actionForPropInsideRender(mutatedProperty) {
return {
type: 'PROBLEM_CHILD_INSIDE_RENDER',
mutatedProperty
}
}
function actionForPropInsideGetChildren(mutatedProperty) {
return {
type: 'PROBLEM_CHILD_INSIDE_GET_CHILDREN',
mutatedProperty
}
}
const actionCreators = {actionCreatorForPropInsideRender, actionCreatorForPropInsideGetChildren};
function actionCreatorForPropInsideRender(state, mutatedProperty) {
let newState = state.setIn(['uiState', 'renderProperty'], mutatedProperty),
nodeValue;
nodeValue = newState.getIn(['uiState', 'renderProperty']);
return newState;
}
function actionCreatorForPropInsideGetChildren(state, mutatedProperty) {
let newState = state.setIn(['uiState', 'getChildrenProperty'], mutatedProperty),
nodeValue;
nodeValue = newState.getIn(['uiState', 'getChildrenProperty']);
return newState;
}
ReactDOM.render(
<div>
<ReactRedux.Provider store={store}>
<ProblemChild />
</ReactRedux.Provider>
</div>,
document.getElementById('container')
);
setDynamicChildren() {
this.setState({
children: this.getChildren()
});
}
Is there a reason your intermixing redux state and local class state changes? From my experience this is asking for weird behaviour. I would swap this.setState for this.props.dispatch(action...) to update the redux store state. Do you still have issues when the complete state is now in redux? Otherwise a snapshot of redux dev tools state changes would be helpful in these cases.