I have trouble understanding how ScrollView works in React Native. In my view, I have a scrollview that is wrapped in a containerview with containerStyle that has a flex:1. However the elements inside my view dont scroll..
render() {
const {containerStyle, eventsWrapperStyle, footerStyle} = styles
return (
<View style={containerStyle}>
<Header/>
<ScrollView style={eventsWrapperStyle}>
{this.renderEvents()}
{this.renderMonthlyStats()}
</ScrollView>
<Footer>
<View style={styles.footerButtonsWrapper}>
<Button customStyle={styles.footerButtonStyle} onPress = {() => this.props.resetAppInfo()}>NEW</Button>
<Button customStyle={styles.footerButtonStyle} onPress={() => this.props.logoutUser()}>SIGN OUT</Button>
</View>
</Footer>
</View>
)
}
const styles = {
monthlyStatsWrapper: {
margin: 10,
flexDirection: 'column'
},
monthlyStatsLine: {
width: '85%',
alignItems: 'center',
marginTop: 10,
flexDirection: 'row',
justifyContent: 'space-between'
},
containerStyle: {
flex: 1,
flexDirection: 'column',
alignItems: 'center',
},
footerButtonsWrapper: {
flex: 1,
flexDirection: 'row',
alignItems: 'center',
justifyContent: 'center'
},
footerButtonStyle: {
width: 170
},
eventsWrapperStyle: {
marginTop: 50,
padding: 30,
flex: 1,
paddingBottom: 100,
}
};
Could you help me understand how scrollView works and make my elements inside it scroll ?
Here's the code for the Footer element which is absolutely positioned (might be part of the problem ?)
class Footer extends Component {
render(){
const { footerStyle } = styles;
return (
<View style={[footerStyle, this.props.customStyle]}>
{this.props.children}
</ View>
);
}
};
const styles = {
footerStyle: {
position: 'absolute',
width: '100%',
bottom: 0,
height: 130,
backgroundColor: '#FCFCFC'
}
};
Related
I'm using the Biglist component in React Native and I have an item in the header that I would like to appear on top of the contents of the list. If you look at the screen shot you'll see what I mean. I've tried everything I can think of but just can't get the header item to appear on top. This is the code I'm using :
import { useEffect, useState } from 'react';
import { StyleSheet, Text, View, Dimensions } from 'react-native';
import BigList from 'react-native-big-list';
export default function App() {
const windowWidth = Dimensions.get('window').width;
const [homedata, setHomedata] = useState(null);
useEffect(() => {
setHomedata([
{ id: 1, value: "Dog" },
{ id: 2, value: "Cat" },
{ id: 3, value: "Hen" },
{ id: 4, value: "Sheep" }
])
}, [])
const renderHeader = () => {
return (
<View style={{ flex: 1, justifyContent: 'center', alignItems: 'center', borderWidth: 1, margin: 10 }}>
<Text>This is the header</Text>
<View style={[styles.headeritem, { position: 'absolute', top: 130, zIndex: 10000 }]}>
<Text>This item needs to go on top</Text>
</View>
</View>
)
}
const renderItem = (props) => {
var item = props.item;
return (
<View style={{ borderWidth: 1, flex: 1, justifyContent: 'center', alignItems:
'center', backgroundColor: '#ccc', margin: 10 }}><Text>{item.value}</Text></View>
)
}
return (
<View style={styles.container}>
<BigList
headerHeight={200}
renderHeader={renderHeader}
data={homedata}
numColumns={2}
keyExtractor={item => String(item.id)}
itemHeight={(windowWidth / 2)}
renderItem={(props) => renderItem(props)}
/>
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#fff',
alignItems: 'center',
justifyContent: 'center',
},
headeritem: {
padding: 10,
borderWidth: 1,
height: 100,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: 'lightgreen'
}
});
After a lot of messing about I finally figured it out. So if anyone else is struggling with this, this is what I did.
I changed the style attribute in the header View tag to this:-
<View style={{ flex: 1, justifyContent: 'center', alignItems: 'center', borderWidth: 1, margin: 10, zIndex: 101 }}>
And added this attribute to the Biglist : -
columnWrapperStyle={{ zIndex: 100,}}
So the full Biglist becomes :-
<BigList
headerHeight={200}
renderHeader={renderHeader}
data={homedata}
numColumns={2}
keyExtractor={item => String(item.id)}
itemHeight={(windowWidth / 2)}
renderItem={(props) => renderItem(props)}
columnWrapperStyle={{ zIndex: 100,}}
/>
and after those changes it worked as I wanted.
I am trying to put the elements of a 2 since what is a data .map and I can not put a divider DIV with a flexDirection: "row", I need to make a wrap and they are accommodated but doing it is not working correctly.
<View
style={styles.container_cards}
>
{
data.map((elements, index) => {
return(
<CardTwoRows elements={elements}/>
)
})
}
</View>
const styles = StyleSheet.create({
container_cards: {
width: "100%",
height: "100%",
marginTop: verticalScale(14),
flexWrap: "wrap",
},
})
My CardTwoRows, it basically contains this
<View style={styles.container}>
.........
</View>
const styles = StyleSheet.create({
container: {
width: "49%",
height: verticalScale(220),
borderRadius: scale(6),
marginRight: "2%",
},
})
This is a sample of how it looks, I need to show 2 then a space between the lines and 2 cards again
You can use a flatlist like this.
A working demo as well as the code below
import * as React from 'react';
import { Text, View, StyleSheet, FlatList } from 'react-native';
import Constants from 'expo-constants';
const list = [0, 1, 2, 3, 4, 5, 6, 7];
export default function App() {
return (
<View style={styles.container}>
<FlatList
data={list}
numColumns={2}
keyExtractor={(item)=> item}
renderItem={({ item }) => (
<View style={styles.card}>
<Text style={styles.text}>{item}</Text>
</View>
)}
/>
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
paddingTop: Constants.statusBarHeight,
backgroundColor: '#ecf0f1',
padding: 8,
},
card: {
height: 100,
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#212121',
margin: 5,
borderRadius: 10,
},
text: {
fontSize: 40,
fontWeight: '600',
color: 'white',
},
});
I'm working on a react native application,
In this application I have an image capturing the view, If the user captures an image it will be stored in the state hook, if something stored it will be displayed in Flatlist.
If we think the user needs to remove an item from the list, that I have provided a delete button. When a user clicks on it the item should be removed from the state and update the Flatlist.
My question is: after removing an item from the state my view is not re-render. I can guarantee that data is successfully removed from the state, but my Flatlist not updating.
My code as follows, please help me to find an answer. Thanks in advance.
below code used to remove the item from the state.
const [selectedFiles, setSelectedFiles] = useState([]);
const removeItemFromArray = (index: number) => {
let imagesArray = selectedFiles;
imagesArray.splice(index, 1);
setSelectedFiles(imagesArray);
}
flatlist
<FlatList
showsHorizontalScrollIndicator={false}
data={selectedFiles}
renderItem={({ item, index }) => {
return (
<ImagePreviewSlider
itemData={item}
viewImage={() => viewImage(index)}
deleteItem={() => removeItemFromArray(index)}
/>
);
}}
/>
---------- complete code --------------
photoUpload.tsx
import React, { useState } from "react";
import {
View,
Text,
StyleSheet,
ScrollView,
Image,
ImageBackground,
TouchableOpacity,
Modal,
FlatList
} from "react-native";
import ImagePicker from 'react-native-image-picker/lib/commonjs';
import ComponentStyles, { FONT_FAMILY, COLORS } from "../../../../constants/Component.styles";
import IconF from 'react-native-vector-icons/FontAwesome';
import ActionButton from "../../../../components/ActionButton";
import ImagePreviewSlider from "../../../../subComponents/ProgressBarWithImage";
import InspectionCheckListItem from './InspectionCheckListRow';
const ImageUpload = props => {
/**
* image capturing and upload tab view
*/
const [modalVisible, setModalVisible] = useState(false);
const [selectedFiles, setSelectedFiles] = useState([]);
/**
* used to open popup dialog / state hook will be updated.
*/
const openModal = () => {
// setModalVisible(true);
props.navigation.navigate('Inspection result');
}
/**
* when user click on previous button this method will be worked.
*/
const previousTab = () => {
props.navigation.navigate('Inspection checkList');
}
/**
* below method used to close the popup dialog.
*/
const colseModal = () => {
setModalVisible(false);
}
/**
* #chooseFile method is a alert dialog / here user can select camera or galery
* #ImagePicker method used to open camera and collect picture / select picture from galery(function)
*/
const chooseFile = () => {
const options = {
title: 'Select an option',
storageOptions: {
skipBackup: true,
path: 'images',
},
};
ImagePicker.showImagePicker(options, (response) => {
// console.log('Response = ', response);
if (response.didCancel) {
console.log('User cancelled image picker');
} else if (response.error) {
console.log('ImagePicker Error: ', response.error);
} else {
// let source = response;
// You can also display the image using data:
let source = {
uri: 'data:image/jpeg;base64,' + response.data
};
setImagesToHooks(source);
}
});
};
/**
*
* #param newImage base64- converted image
*/
const setImagesToHooks = (newImage) => {
// This will update the array. Refer the blog link for more information.
let imagesArray = [...selectedFiles, newImage];
setSelectedFiles(imagesArray);
};
const removeItemFromArray = (index: number) => {
let imagesArray = selectedFiles;
imagesArray.splice(index, 1);
setSelectedFiles(imagesArray);
}
const viewImage = (index: number) => {
console.log("view item : ######## : ");
}
return (
<View style={{ backgroundColor: COLORS.WHITE_BG, flex: 1, borderTopLeftRadius: 30, borderTopRightRadius: 30 }}>
<View style={{ flexDirection: 'row', width: '100%', height: '90%' }}>
<View style={{ width: '50%', height: '100%', padding: "2%" }}>
<TouchableOpacity style={{ width: '100%', height: 300, alignItems: 'center', justifyContent: 'center' }} onPress={chooseFile}>
<ImageBackground style={{ width: '100%', height: 300, alignItems: 'center', justifyContent: 'center' }} resizeMode={'stretch'}
source={require('../../../../assets/images/Rectangle_image_upload.png')} >
<IconF style={{ color: COLORS.ASH_AE }} name="camera" size={80} />
<Text style={{ color: COLORS.ASH_AE }}>Take image or upload from device</Text>
</ImageBackground>
</TouchableOpacity>
</View>
<View style={{ width: '50%', marginTop: 5, }}>
{/* <ProgressBar array={selectedFiles} deleteItem={(value) => deleteItemFromArray(value)}/> */}
<FlatList
showsHorizontalScrollIndicator={false}
data={selectedFiles}
renderItem={({ item, index }) => {
return (
<ImagePreviewSlider
itemData={item}
viewImage={() => viewImage(index)}
deleteItem={() => removeItemFromArray(index)}
/>
);
}}
/>
</View>
</View>
<View style={styles.actionButton}>
<ActionButton
title={'Previous'}
color={COLORS.PINK}
customBtnStyle={{
height: 65,
width: '85%',
}}
onPress={() => previousTab()}
/>
<ActionButton
title={'Next'}
color={COLORS.GREEN_42}
customBtnStyle={{
height: 65,
width: '100%',
}}
onPress={() => openModal()}
/>
</View>
<View>
<Modal
animationType="fade"
transparent={true}
visible={modalVisible} >
<View style={styles.modalContainer}>
<View style={styles.centeredView}>
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<TouchableOpacity style={{ flex: 0.2 }} onPress={colseModal}>
<Image source={require('../../../../assets/images/ic-close.png')} style={{ height: 20, width: 20, marginRight: 10 }} />
</TouchableOpacity>
</View>
<View style={styles.columnView}>
<Text style={styles.contentTitle}>Inspection of pharmacies</Text>
<Text style={styles.contentSubTitle}>Checklist:</Text>
<View style={styles.rowView}>
<View style={{ flex: 1, alignSelf: 'center' }} >
<Text style={styles.tableText}>Description</Text>
</View>
<View style={{ flex: 1, alignSelf: 'center' }} >
<Text style={styles.tableText}>Validiry</Text>
</View>
<View style={{ flex: 1, alignSelf: 'center' }} >
<Text style={styles.tableText}>Remark</Text>
</View>
</View>
</View>
<View style={{ flex: 2, width: '100%', flexDirection: 'column' }}>
{/* <InspectionCheckListItem array={InspectionList.items} /> */}
</View>
</View>
</View>
</Modal>
</View>
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
alignItems: 'center',
justifyContent: 'center'
},
modalContainer: {
position: 'absolute',
width: '100%',
height: '100%',
justifyContent: 'center',
alignItems: 'center',
backgroundColor: 'rgba(100,100,100, 0.5)',
padding: 20,
},
centeredView: {
position: 'relative',
width: '90%',
height: '90%',
backgroundColor: COLORS.WHITE_FC,
padding: 20,
},
inspectionNumber: {
flex: 1.5,
fontSize: 18,
color: COLORS.BLUE_69,
fontFamily: FONT_FAMILY.BOLD
},
modalTitle: {
flex: 2,
fontSize: 12,
color: COLORS.GREEN_42,
fontFamily: FONT_FAMILY.BOLD
},
contentTitle: {
fontSize: 18,
color: COLORS.BLUE_69,
fontFamily: FONT_FAMILY.REGULAR,
},
contentSubTitle: {
fontSize: 18,
color: COLORS.BLUE_69,
fontFamily: FONT_FAMILY.BOLD,
},
columnView: {
flexDirection: 'column',
justifyContent: 'center',
alignItems: 'center'
},
rowView: {
flexDirection: 'row',
justifyContent: 'center',
alignItems: 'center',
marginTop: '5%'
},
tableText: {
fontSize: 18,
color: COLORS.BLUE_69,
fontFamily: FONT_FAMILY.LIGHT,
justifyContent: 'center',
alignSelf: 'center'
},
actionButton: {
flex: 1,
flexDirection: 'row',
justifyContent: 'center',
alignItems: 'flex-end',
position: 'relative',
bottom: '2%',
left: 0,
}
});
export default ImageUpload;
ProgressBarWithImage.tsx
import React, { Component } from "react";
import {
View,
Text,
StyleSheet,
TouchableOpacity
} from "react-native";
import IconMC from 'react-native-vector-icons/MaterialCommunityIcons';
import { ProgressBar } from '#react-native-community/progress-bar-android';
import { COLORS, FONT_FAMILY } from "../constants/Component.styles";
const ProgressBarWithImage = props => {
return (
<View style={styles.container}>
<View style={{ justifyContent: 'center', alignItems: 'center', backgroundColor: COLORS.PINK, opacity: 0.3, height: 40, width: 40, borderRadius: 100 }}>
<TouchableOpacity onPress={props.viewImage}>
<IconMC style={{ color: COLORS.PINK, opacity: 100 }} name="file-image" size={30} />
</TouchableOpacity>
</View>
<View style={{ marginLeft: 20, }}>
<View style={{ flexDirection: 'row', alignItems: 'center', width: '100%' }}>
<Text style={{ fontSize: 15, color: COLORS.BLUE_2C, fontFamily: FONT_FAMILY.SEMI_BOLD }}>Photo01.PNG</Text>
<View style={{ flex: 1 }} />
<TouchableOpacity onPress={props.deleteItem}>
<IconMC style={{ color: COLORS.ASH_AE, opacity: 100, marginLeft: 60, }} name="close" size={20} />
</TouchableOpacity>
</View>
<Text style={{ fontSize: 15, color: COLORS.ASH_AE, fontFamily: FONT_FAMILY.SEMI_BOLD }}>7.5Mb</Text>
<ProgressBar
styleAttr="Horizontal"
indeterminate={false}
progress={1}
/>
</View>
</View>
);
};
const styles = StyleSheet.create({
container: {
alignItems: 'center',
justifyContent: 'center',
flexDirection: 'row',
width: '100%',
marginTop: 20,
},
});
export default ProgressBarWithImage;
Just use extraData prop of flatList to re-render flatList.
Simply add this state
const [refreshFlatlist, setRefreshFlatList] = useState(false);
And on in removeItemFromArray function add the following line
setRefreshFlatList(!refreshFlatlist)
finally, in flatList add this prop
extraData(refreshFlatlist)
I am trying to style a component but cant figure out how to do a couple of things.
1) I want to apply a background color to 100% of my component
return (
<TouchableWithoutFeedback
style={styles.touchable}
onPress={() =>
this.props.navigation.navigate('Quotes', { name: this.props.name })}
>
<View style={styles.viewStyle}>
<Image
source={this.props.image}
key={this.props.image}
style={styles.imageStyle}
/>
<Text style={styles.textStyle}> {this.props.name} </Text>
</View>
</TouchableWithoutFeedback>
);
}
}
const styles = {
imageStyle: {
height: 100,
width: 100
},
touchable: {
width: '100%',
backgroundColor: 'black'
},
viewStyle: {
height:100,
flexDirection: 'row',
alignItems: 'center',
justifyContent: 'center',
width: '100%',
backgroundColor: 'black'
},
textStyle: {
marginLeft: 20,
width: 120,
fontWeight: 'bold',
fontSize: 15
}
}
I tried to apply the background color to touchable tag a view tag but none of this work.
Moreover Id like to position my image at the top left of the component using justifyContent: flex-start. But my elements inside the view tag keeps staying centered.
How can I achieve these goals ?
The parent component is :
render() {
const {listStyle} = styles
return (
<ScrollView style={listStyle}>
{this.renderCharacters(this.props.matches)}
</ScrollView>
);
}
}
const styles = {
listStyle: {
width: '100%',
height: '100%'
}
}
I'm trying to make 2 colors of background using flex, and it seems to work good but I want to make the button on the middle as in the photo, where I need to insert the button in the code?
i want it to be like this:
return (
<View style={container}>
<View style={leftContainer}>
</View>
<View style={rightContainer}>
</View>
<Button
title="button"/>
</View>
)
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
flexDirection:'row'
},
leftContainer:{
flex:1,
backgroundColor: '#ca8afa',
},
rightContainer:{
flex:1,
backgroundColor: '#96d0e3'
},
addButton: {
justifyContent: 'center',
alignItems: 'center',
position: 'absolute',
bottom: 20,
right: 20,
zIndex: 1111,
width: calcSize(192 / 2),
height: calcSize(192 / 2)
}
})
the problem is that the button is also in the row now and not in the middle,
how can i fix it?
Here's a live demo of a possible solution: https://snack.expo.io/HJFL7A3ez
Edit - Adding the code here as well:
export default class App extends Component {
render() {
return (
<View style={styles.container}>
<View style={styles.leftContainer}>
</View>
<View style={styles.rightContainer}>
</View>
<View style={styles.buttonContainer}>
<Button style={styles.addButton} title="button"/>
</View>
</View>
)
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
flexDirection:'row'
},
leftContainer:{
flex:1,
backgroundColor: '#ca8afa',
},
rightContainer:{
flex:1,
backgroundColor: '#96d0e3'
},
buttonContainer: {
position: 'absolute',
width: '100%',
height: '100%',
justifyContent: 'center',
alignItems: 'center',
},
addButton: {
zIndex: 1111,
width: 200
}
})