I am learning to set the time in ReactNative.
I was able to set the time with the onConfirm process of DateTimePickerModal, but I am having trouble closing the DateTimePicker at the same time.
Here is the source.
import React, {Component} from 'react';
import{
Text,
View,
Button,
}from 'react-native';
//import DateTimePicker from '#react-native- community/datetimepicker';
import DateTimePickerModal from "react-native-modal-datetime-picker";
export default class App extends Component<{}>{
constructor(){
super()
this.state={
vibrate: false,
date: new Date(),
isShowDatePicker: false
}
}
render(){
var {date} = this.state
return (
<View style={{
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: "F5FCFF"
}}>
<Text>{date.getFullYear()}Y {date.getMonth() + 1}M {date.getDate()}D</Text>
<Button
title={'Press'}
onPress={() => this.setState({ isShowDatePicker: !this.state.isShowDatePicker })} />
<DateTimePickerModal
isVisible={this.state.isShowDatePicker}
mode="date"
date={this.state.date}
onConfirm={
date=>{this.setState({date})}
}
onCancel={() => this.setState({ isShowDatePicker: !this.state.isShowDatePicker })}
headerTextIOS='Please Select Date'
confirmTextIOS='OK' />
</View>
);
}
}
I would like to write the process in OnConfirm like this, but I can't do it.
onConfirm={
date=>{this.setState({date})},
() => this.setState({ isShowDatePicker: !this.state.isShowDatePicker })
}
This description only closes the window and does not set the time.
I would appreciate it if someone could tell me how to do this.
Write your onConfirm like this..This would close the modal
onConfirm={(data) => {
this.setState({date})
this.setState({ isShowDatePicker: false })
}
Also your onCancel like this
onCancel={() => this.setState({ isShowDatePicker: false })}
Don't set the state to !isShowDatePicker as we know onCancel and onConfirm we need to close the modal..so set it to false rather than setting it to !isShowDatePicker
Also change your Button onPress to this
<Button
title={'Press'}
onPress={() => this.setState({ isShowDatePicker:true })} />
See working example here
Related
Task.js
export const Task = ({ addTask }) => {
const [focusItem, setFocusItem] = useState(null);
return (
<View style={styles.titleContainer}>
<Text style={styles.title}>What would you like to focus on?</Text>
<View style={styles.container}>
<TextInput
style={{ flex: 1 }}
maxLength={50}
value={focusItem}
onSubmitEditing={()=>({ nativeEvent: { text } }) => setFocusItem(text)}
/>
<RoundedButton
style={styles.addSubject}
size={50}
title="+"
onPress={()=>addTask(focusItem)}
/>
</View>
</View>
);
};
App.js
import React, { useState } from 'react';
import { Text, View, StyleSheet } from 'react-native';
import Constants from 'expo-constants';
import {Task} from './src/features/task/Task'
export default function App() {
const [task, setTask] = useState(null);
return (
<View style={styles.container}>
{
task ?
(<Text></Text>):
(<Task addTask = {setTask}/>)
}
<Text>{task}</Text>
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#425670',
},
});
I have tried to send the data from Task to App component by setting the value from Task. But onPress is not working.
I could see the text has been set successfully while executing the onSubmitEditing, but the onPress is doing nothing. Please help me fix this.
Thanks in advance
You need to change this
onSubmitEditing={()=>({ nativeEvent: { text } }) => setFocusItem(text)}
to
onSubmitEditing={({ nativeEvent: { text } }) => setFocusItem(text)}
You could also refer I want to update the parent according to the change of the child to react native
why useState auto update? I'll press button and not showing textinput. but I can save file without change. textinput will be showing. sorry my bad english
import React, { useState,useEffect } from 'react';
import {Text, TextInput, View, Button,} from 'react-native';
const Test = ({navigation}) => {
const [textInput, settextInput] = useState([]);
useEffect(() => {
addTextInput = (key) => {
textInput.push([<TextInput style={{backgroundColor :'#7ACB4A',marginTop:10}} key={key} />]);
settextInput(textInput);
console.log(textInput);
}
},[textInput]);
return(
<View>
<Button title='+' onPress={() =>
addTextInput(textInput.length)} />
{textInput.map((value, index) => {
return value
})}
<Text>{textInput.length}</Text>
</View>
);
}
export default Test;
I have a few suggests to make your code better.
Don't change state value if not in use 'setState'.
This is false by nature and causes errors.
addTextInput = (key) => {
textInput.push([<TextInput style={{backgroundColor :'#7ACB4A',marginTop:10}} key={key} />]);
settextInput(textInput);
console.log(textInput);
}
State merely contains value, it should not contain different things. You should return TextInput in your map function.
I try rewrite your code, sorry because my english. Hope help you
code:
const [textInput, setTextInput] = React.useState(['1', '2'])
const addTextInput = (key: string) => {
const tempInput = textInput.concat([key])
setTextInput(tempInput)
}
return (
<View style={{ alignItems: 'center', justifyContent: 'center', flex: 1 }}>
<Button title="+" onPress={() => addTextInput(textInput.length.toString())} />
{textInput.map((value, index) => {
return (
<TextInput style={{ backgroundColor: '#7ACB4A', marginTop: 10, width: '70%' }} key={index + ''} />
)
})}
<Text>{textInput.length}</Text>
</View>
)
}
Having issue with OTSubscriber.
Subscribe does not render inside the Modal but Publish is working fine as expected.
import React, { Component } from 'react';
import { Modal, View, Text, Button } from 'react-native';
import {OTSession, OTPublisher, OTSubscriber } from 'opentok-react-native';
export default class App extends Component {
constructor(props) {
super(props);
this.state = {
modalVisible: false
};
}
publishSubscribe = () => {
this.setState({
modalVisible: true
})
}
render(){
return(
<View style={{ flex: 1 }}>
<View>
<Text>opentok session</Text>
<Button title="Publish + Subscribe" onPress={ () => this.publishSubscribe() }/>
</View>
<OTSession
apiKey=''
sessionId=''
token=''
>
<Modal visible={this.state.modalVisible }>
<OTPublisher style={{ height: 100, width: 100 }} />
<OTSubscriber style={{ height: 100, width: 100 }} />
</Modal>
</OTSession>
</View>
);
}}
if modalVisible : true set on constructor state, the modal popups on page load and both subscriber and publisher renders as expected.
I'm trying to render a Flatlist that contains a store name. Upon clicking the store name, more information about the store should be displayed.
I attempted to change state and then use
{this.renderMoreDetails(item) && this.state.moreDetailsShown}
to get the additional information to appear. However, it was clear via console.log that state was only changed after a second button press.
From what I read in this article 1 and this article 2 it seemed as though I needed a callback function as an additional parameter to my setState().
I tried adding a callback function(probably incorrect, but I'm extremely lost at this point) and only got more errors.
I know that I have access to all of the data from renderItem inside FlatList. How do I make it appear upon click?
import React, { Component } from 'react';
import {
View,
FlatList,
Text,
TouchableWithoutFeedback,
ListView,
ScrollView
} from 'react-native'
import { NavigationActions } from 'react-navigation';
import { Header, Card, CardSection } from '../common';
import Config from '../Config';
export default class Costco extends Component<Props> {
constructor(props) {
super(props);
this.state = {
stores: [],
selectedItem: {id: null},
};
}
componentWillMount() {
const obj = Config.costcoThree;
const costcoArr = Object.values(obj);
this.setState({
stores: costcoArr,
})
}
renderListOfStores() {
return <FlatList
data={this.state.stores}
renderItem={ ({item}) => this.singleStore(item)}
keyExtractor={(item) => item.id}
extraData={this.state.selectedItem} />
}
singleStore(item) {
console.log(this.state.selectedItem.id)
return item.id === this.state.selectedItem.id ?
<TouchableWithoutFeedback
onPress={() => this.selectStore(item)}
>
<View>
<Text>{item.branchName}</Text>
<Text>Opening Time {item.openingTime}</Text>
<Text>Closing Time {item.closingTime}</Text>
<Text>Address {item.dongAddKor}</Text>
</View>
</TouchableWithoutFeedback>
:
<TouchableWithoutFeedback>
<View>
<Text>{item.branchName}</Text>
<Text>Only showing second part</Text>
</View>
</TouchableWithoutFeedback>
}
selectStore(item) {
this.setState({selectedItem: item});
console.log('repssed');
}
render() {
return(
<ScrollView>
<Header headerText="Costco"/>
<Text>hello</Text>
{this.renderListOfStores()}
</ScrollView>
)
}
}
as a workaround you can have a state that maintain your selected item to expand(or something like another view) and then you can use some conditions to work for render your flat list data.
Consider the below code and let me know if you need some more clarification.
import React, { Component } from 'react';
import {
Platform,
StyleSheet,
Text,FlatList,TouchableNativeFeedback,
View
} from 'react-native';
export default class App extends Component<Props> {
constructor(props) {
super(props);
this.state = {
response: [],
selectedItem: {id: null},
};
}
userListLayout() {
const {response} = this.state;
return <FlatList data={response} renderItem={ ({item}) => this.singleUserLayout(item)} keyExtractor={(item) => item.email} extraData={this.state.selectedItem} />
}
singleUserLayout(item) {
return item.id == this.state.selectedItem.id ?
<TouchableNativeFeedback onPress={() => this.userSelected(item)}>
<View style={{flex:1, borderColor: 'black', borderWidth: 1}}>
<Text style={{padding: 10, fontSize: 25}}>{item.email}</Text>
<Text style={{padding: 10,fontSize: 20}}>{item.name}</Text>
</View>
</TouchableNativeFeedback>
: <TouchableNativeFeedback onPress={() => this.userSelected(item)}><Text style={{padding: 10,fontSize: 20}}>{item.email}</Text></TouchableNativeFeedback>
}
userSelected(item) {
console.log(item)
this.setState({selectedItem: item})
}
componentDidMount() {
fetch("https://jsonplaceholder.typicode.com/users")
.then(data => data.json())
.then(response => this.setState({response}))
}
render() {
return (
<View style={styles.container}>
<Text style={styles.welcome}>HI THERE</Text>
{this.userListLayout()}
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#F5FCFF',
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
},
instructions: {
textAlign: 'center',
color: '#333333',
marginBottom: 5,
},
});
I am new to react native and have been doing this for a week or so. I just finished the tutorials for making an interactive buttons and work on it. But i am stuck on this. The app is really simple right now, just trying to make a form and add some trigger event using onPress on it.
Below is the portion of my code. I am simply lost for words why its not calling SubmitThisForm() on the onPress event.
Can you guys help me on this.
Thanks a lot.
import React, { Component } from 'react';
import {Container, Content, InputGroup,Button, View, Icon, Card,
CardItem, Text, Body} from 'native-base';
import {Input} from './common';
class LoginForm extends Component {
state = {email: '', password: ''};
SubmitThisForm() {
console.log("Can you see this");
}
render () {
return (
<Container>
<Content>
<Card style={styles.FormContainer}>
<CardItem>
<Body>
<InputGroup borderType="regular">
<Icon name="ios-mail-outline" style={{color:'#384850'}}/>
<Input
placeHolder="example#example.com"
value = {this.state.email}
onChangeText={email=>this.setState( { email })}
/>
</InputGroup>
<InputGroup borderType="regular">
<Icon name="lock" style={{color:'#384850'}}/>
<Input
secureTextEntry= {true}
placeHolder="password"
value = {this.state.password}
onChangeText={password=>this.setState( { password })}
/>
</InputGroup>
</Body>
</CardItem>
</Card>
<View style={styles.SignIn}>
<Button block warning onPress={ () => {this.SubmitThisForm()}}><Text>Sign In</Text></Button>
</View>
<View style={styles.SignUp}>
<Button block info><Text>Sign Up</Text></Button>
</View>
<View style={styles.SignIn}>
<Button block primary><Text>Forgot Password</Text></Button>
</View>
</Content>
</Container>
);
};
}
const styles = {
ErrorTextStyle: {
fontSize: 20,
alignSelf: 'center',
color: 'red'
},
FormContainer:{
marginTop:30,
shadowColor:'#000',
shadowOffset:{width:0,height:2},
shadowOpacity:0.1,
shadowRadius:2,
},
SignIn:{
marginTop:10,
flex:1,
alignSelf:'stretch',
},
SignUp:{
marginTop:40,
flex:1,
alignSelf:'stretch',
}
}
export default LoginForm
The include input component is like this:
import React from 'react';
import {Text, View, TextInput} from 'react-native';
const Input = ({ label,value,onChangeText,placeHolder,secureTextEntry }) => {
const {InputStyle,LabelStyle,ContainerStyle } = styles;
return (
<View style = {ContainerStyle}>
<TextInput
secureTextEntry = {secureTextEntry}
placeholder={placeHolder}
autoCorrect={false}
style = {InputStyle}
value={value}
onChangeText={onChangeText}
/>
</View>
);
};
const styles = {
InputStyle:{
color:'#000',
paddingRight:5,
paddingLeft:5,
fontSize:18,
lineHeight:30,
flex:2,
height:40
},
LabelStyle:{
fontSize:18,
paddingLeft:20,
flex:1,
},
ContainerStyle:{
height:40,
flex:1,
flexDirection:'row',
alignItems:'center'
}
}
export { Input };
You need to either use an Arrow function, or bind() SubmitThisForm to your Component.
You can either declare your method like:
SubmitThisForm = () => {
console.log('Can you see this?')
}
Or, you can bind() your function in the constructor by adding:
constructor() {
super()
this.SubmitThisForm = this.SubmitThisForm.bind(this)
}
If you do not bind this in your custom functions, this will equal undefined. When you use Arrow functions however, this is lexically scoped which means the context of this will be the enclosing context (LoginForm)