I am having an error which is showing
TypeError: undefined is not an object (evaluating 'Navigation.navigate')
i were tried to fix this error but didnt work, I also search the error on network but i am getting other content steps
There My Codes:
export const App = ({ Navigation }) => {
/*My Codes*/
<TouchableOpacity onPress={() => Navigation.navigate("DetailsPage2")>
/*My Object*/
</TouchableOpacity>
I wanted To Switch Pages By clicking on the object using onPress and use arrow function but it shows the error, I tried These Steps to resolve it but it also didnt work These are The steps below which i used to fix the error
onPress={() => Navigation.getParam("DetailsPage2") and
onPress={() => Navigation.push("DetailsPage2")
I imported all the imports which i need Like
import React, { useState, useRef, useEffect, createRef, useCallback, } from "react"; import { View, Text, Image, ScrollView, TextInput, StyleSheet, Switch, Animated, Dimensions, Vibration, Alert, KeyboardAvoidingView, Platform, TouchableWithoutFeedback, TouchableOpacity, SafeAreaView, } from "react-native"; import { Svg, Path, Defs, RadialGradient, LinearGradient, Stop, Ellipse, Rect, } from "react-native-svg";
Sorry I Cannot Show My Main Code, If I Show It.
It Could Be Stolen
This error is occurring because the 'Navigation' object is not defined in the App component. It is not being imported correctly.
Make sure that the navigation object is being passed in as a prop to the App component and that it is being imported correctly.
Replace Navigation with navigation:
export const App = ({ navigation }) => {
/*My Codes*/
<TouchableOpacity
onPress={() => navigation.navigate("DetailsPage2")>
/*My Object*/
</TouchableOpacity>
}
Here is the official doc related to this issue reference link.
& React Navigation official website for explore more Link.
Im building a react-native app and the screen so far loads an image from a uri into a BackgroundImage and there is also some text loading on top of the image, please see the attached image:
So what i want is to get this image and text downloaded to the device, merge them if you will?
Any suggestions are welcome..
Thanks
I would recommend you to use the ViewShot component from here.
Here's an example of how you would be able to integrate it with your project (keep in mind this uses the ES6 arrow function syntax):
class CaptureImage extends Component {
capturePic = () => {
this.refs.viewShot.capture().then(uri => {
console.log("Path to the image: ", uri); // do what you want with the url
})
};
render() {
return (
<View
<ViewShot ref="viewShot">
// your background image components go here (the image with the text you want to capture)
</ViewShot>
// rest of your code goes here
<Button onClick= {() => capturePic()} /> // button just for demonstration purpose
</View>
);
}
}
Hope you understood :)
I am new to react native development. I have login screen in that login screen i have logo image, for that i have kept image in resource folder and given that path in code. But getting unable to resolve module.
Why this error coming don't know.
The following is the code
import React, {Component} from 'react';
import {StyleSheet, Text, View,TextInput,TouchableOpacity,StatusBar,Image} from 'react-native';
export default class App extends Component {
static navigationOptions = {
title: "Welcome",
header: null,
}
render() {
// const { navigate } = this.props.navigation
return (
<View style={styles.container}>
<StatusBar
barStyle="light-content"
backgroundColor="#003366"
/>
<Text style={styles.welcome}>SEDC</Text>
<View style={styles.user}>
<Image source={require('./resource/ic_userid.png')}/>
<TextInput placeholder="Acct No/User Id" style={styles.textInput} underlineColorAndroid={'rgb(0,0,0)'}></TextInput>
</View>
<TextInput placeholder="Password" style={styles.textInput} underlineColorAndroid={'rgb(0,0,0)'}></TextInput>
<TouchableOpacity style={styles.btn} onPress={this.login}><Text style={{color: 'white'}}>Log In</Text></TouchableOpacity>
</View>
);
}
login=()=>{
// alert("testing......");
this.props.navigation.navigate('Profile');
}
}
And the following is the project view in visual studio.
The code is in Login.js and images are in resource folder. But why the bellow error coming. This is the image code
<Image source={require('./resource/ic_userid.png')}/>
But this is the very small question and duplicate, But I don't know why error is coming. So please guide me how to do this.
Thanks In Advance
The Image you are hitting is in the wrong directory. You are looking in the /components for a resource directory.
<Image source={require('../../resource/ic_userid.png')}/>
Remember ./ means current directory.
Your App directory is as so:
App.js
- app
- components
- Login
Just try this <Image source={require('../../resource/ic_userid.png')}/> instead of using this <Image source={require('./resource/ic_userid.png')}/>
I'm currently building a test app using React Native. The Image module thus far has been working fine.
For example, if I had an image named avatar, the below code snippet works fine.
<Image source={require('image!avatar')} />
But if I change it to a dynamic string, I get
<Image source={require('image!' + 'avatar')} />
I get the error:
Requiring unknown module "image!avatar". If you are sure the module is there, try restarting the packager.
Obviously, this is a contrived example, but dynamic image names are important. Does React Native not support dynamic image names?
This is covered in the documentation under the section "Static Resources":
The only allowed way to refer to an image in the bundle is to literally write require('image!name-of-the-asset') in the source.
// GOOD
<Image source={require('image!my-icon')} />
// BAD
var icon = this.props.active ? 'my-icon-active' : 'my-icon-inactive';
<Image source={require('image!' + icon)} />
// GOOD
var icon = this.props.active ? require('image!my-icon-active') : require('image!my-icon-inactive');
<Image source={icon} />
However you also need to remember to add your images to an xcassets bundle in your app in Xcode, though it seems from your comment you've done that already.
http://facebook.github.io/react-native/docs/image.html#adding-static-resources-to-your-app-using-images-xcassets
This worked for me :
I made a custom image component which takes in a boolean to check if the image is from web or is being passed from a local folder.
// In index.ios.js after importing the component
<CustomImage fromWeb={false} imageName={require('./images/logo.png')}/>
// In CustomImage.js which is my image component
<Image style={styles.image} source={this.props.imageName} />
If you see the code, instead of using one of these:
// NOTE: Neither of these will work
source={require('../images/'+imageName)}
var imageName = require('../images/'+imageName)
I'm just sending the entire require('./images/logo.png') as a prop. It works!
RELEVANT IF YOU HAVE KNOWN IMAGES (URLS):
The way I hacked my way through this problem:
I created a file with an object that stored the image and the name of the image:
export const ANIMAL_IMAGES = {
dog: {
imgName: 'Dog',
uri: require('path/to/local/image')
},
cat: {
imgName: 'Cat on a Boat',
uri: require('path/to/local/image')
}
}
Then I imported the object into the component where I want to use it and just do my conditional rendering like so:
import { ANIMAL_IMAGES } from 'path/to/images/object';
let imgSource = null;
if (condition === 'cat') {
imgSource = ANIMAL_IMAGES.cat.uri;
}
<Image source={imgSource} />
I know it is not the most efficient way but it is definitely a workaround.
Hope it helps!
If you're looking for a way to create a list by looping through a JSON array of your images and descriptions for example, this will work for you.
Create a file (to hold our JSON database) e.g ProfilesDB.js:
const Profiles = [
{
id: '1',
name: 'Peter Parker',
src: require('../images/user1.png'),
age: '70',
},
{
id: '2',
name: 'Barack Obama',
src: require('../images/user2.png'),
age: '19',
},
{
id: '3',
name: 'Hilary Clinton',
src: require('../images/user3.png'),
age: '50',
},
];
export default Profiles;
Then import the data in our component and loop through the list using a FlatList:
import Profiles from './ProfilesDB.js';
<FlatList
data={Profiles}
keyExtractor={(item, index) => item.id}
renderItem={({item}) => (
<View>
<Image source={item.src} />
<Text>{item.name}</Text>
</View>
)}
/>
Good luck!
As the React Native Documentation says, all your images sources needs to be loaded before compiling your bundle
So another way you can use dynamic images it's using a switch statement. Let's say you want to display a different avatar for a different character, you can do something like this:
class App extends Component {
state = { avatar: "" }
get avatarImage() {
switch (this.state.avatar) {
case "spiderman":
return require('./spiderman.png');
case "batman":
return require('./batman.png');
case "hulk":
return require('./hulk.png');
default:
return require('./no-image.png');
}
}
render() {
return <Image source={this.avatarImage} />
}
}
Check the snack: https://snack.expo.io/#abranhe/dynamic-images
Also, remember if your image it's online you don't have any problems, you can do:
let superhero = "spiderman";
<Image source={{ uri: `https://some-website.online/${superhero}.png` }} />
First, create a file with image required - React native images must be loaded this way.
assets/index.js
export const friendsandfoe = require('./friends-and-foe.png');
export const lifeanddeath = require('./life-and-death.png');
export const homeandgarden = require('./home-and-garden.png');
Now import all your assets
App.js
import * as All from '../../assets';
You can now use your image as an interpolated value where imageValue (coming in from backend) is the same as named local file ie: 'homeandgarden':
<Image style={styles.image} source={All[`${imageValue}`]}></Image>
Important Part here:
We cannot concat the image name inside the require like [require('item'+vairable+'.png')]
Step 1: We create a ImageCollection.js file with the following collection of image properties
ImageCollection.js
================================
export default images={
"1": require("./item1.png"),
"2": require("./item2.png"),
"3": require("./item3.png"),
"4": require("./item4.png"),
"5": require("./item5.png")
}
Step 2: Import image in your app and manipulate as necessary
class ListRepoApp extends Component {
renderItem = ({item }) => (
<View style={styles.item}>
<Text>Item number :{item}</Text>
<Image source={Images[item]}/>
</View>
);
render () {
const data = ["1","2","3","4","5"]
return (
<FlatList data={data} renderItem={this.renderItem}/>
)
}
}
export default ListRepoApp;
If you want a detailed explanation you could follow the link below
Visit https://www.thelearninguy.com/react-native-require-image-using-dynamic-names
Courtesy : https://www.thelearninguy.com
you can use
<Image source={{uri: 'imagename'}} style={{width: 40, height: 40}} />
to show image.
from:
https://facebook.github.io/react-native/docs/images.html#images-from-hybrid-app-s-resources
import React, { Component } from 'react';
import { Image } from 'react-native';
class Images extends Component {
constructor(props) {
super(props);
this.state = {
images: {
'./assets/RetailerLogo/1.jpg': require('../../../assets/RetailerLogo/1.jpg'),
'./assets/RetailerLogo/2.jpg': require('../../../assets/RetailerLogo/2.jpg'),
'./assets/RetailerLogo/3.jpg': require('../../../assets/RetailerLogo/3.jpg')
}
}
}
render() {
const { images } = this.state
return (
<View>
<Image
resizeMode="contain"
source={ images['assets/RetailerLogo/1.jpg'] }
style={styles.itemImg}
/>
</View>
)}
}
To dynamic image using require
this.state={
//defualt image
newimage: require('../../../src/assets/group/kids_room3.png'),
randomImages=[
{
image:require('../../../src/assets/group/kids_room1.png')
},
{
image:require('../../../src/assets/group/kids_room2.png')
}
,
{
image:require('../../../src/assets/group/kids_room3.png')
}
]
}
when press the button-(i select image random number betwenn 0-2))
let setImage=>(){
//set new dynamic image
this.setState({newimage:this.state.randomImages[Math.floor(Math.random() * 3)];
})
}
view
<Image
style={{ width: 30, height: 30 ,zIndex: 500 }}
source={this.state.newimage}
/>
I know this is old but I'm going to add this here as I've found this question, whilst searching for a solution. The docs allow for a uri: 'Network Image'
https://facebook.github.io/react-native/docs/images#network-images
For me I got images working dynamically with this
<Image source={{uri: image}} />
<StyledInput text="NAME" imgUri={require('../assets/userIcon.png')} ></StyledInput>
<Image
source={this.props.imgUri}
style={{
height: 30,
width: 30,
resizeMode: 'contain',
}}
/>
in my case i tried so much but finally it work StyledInput component name
image inside the StyledInput if you still not understand let me know
Say if you have an application that has similar functionality as that of mine. Where your app is mostly offline and you want to render the Images one after the other. Then below is the approach that worked for me in React Native version 0.60.
First create a folder named Resources/Images and place all your images there.
Now create a file named Index.js (at Resources/Images) which is responsible for Indexing all the images in the Resources/Images folder.
const Images = {
'image1': require('./1.png'),
'image2': require('./2.png'),
'image3': require('./3.png')
}
Now create a Component named ImageView in your choice of folder. One can create functional, class or constant component. I have used the Const component. This file is responsible for returning the Image depending on the Index.
import React from 'react';
import { Image, Dimensions } from 'react-native';
import Images from './Index';
const ImageView = ({ index }) => {
return (
<Image
source={Images['image' + index]}
/>
)
}
export default ImageView;
Now from the component wherever you want to render the Static Images dynamically, just use the ImageView component and pass the index.
< ImageView index={this.qno + 1} />
Create a constant where you save the image path including require, then in source put the name of that constant.
const image = condition ? require("../img/image1.png") : require('../img/image2.png');
<Image source={image} />
Here is a simple and truly dynamic solution to the problem if you have a bigger no of files.
[Won't work for Expo Managed]
Although the question is old I think this is the simpler solution and might be helpful. But I beg a pardon for any terminological mistakes, correct me please if I do any.
INSTEAD OF USING REQUIRE WE CAN USE THE URI WITH NATIVE APP ASSETS FOR ANDROID (AND/OR iOS). HERE WE WILL DISCUSS ABOUT ANDROID ONLY
URI can easily be manipulated as per the requirement but normally it's used for network/remote assets only but works for local and native assets too. Whereas require can not be used for dynamic file names and dirs
STEPS
Open android/app/src/main/assets folder from your App.js or index.js containing directory, if the assets folder doesn't exist create one.
Make a folder named images or any NAME of your choice inside assets, and paste all the images there.
Create a file named react-native.config.js in the main app folder containing App.js or index.js.
Add these lines to the new js file:
module.exports = {
project: {
ios: {},
android: {},
},
assets: ['./assets/YOUR_FOLDER_NAME/'],
};
at the place of YOUR_FOLDER_NAME use the newly created folder's name images or any given NAME
Now run npx react-native link in your terminal from main app folder, this will link/add the assets folder in the android bundle. Then rebuild the debug app.
From now on you can access all the files from inside android/app/src/main/assets in your react-native app.
For example:
<Image
style={styles.ImageStyle}
source={{ uri: 'asset:/YOUR_FOLDER_NAME/img' + Math.floor(Math.random() * 100) + '.png' }}
/>
You should use an object for that.
For example, let's say that I've made an AJAX request to an API and it returns an image link that I'll save to state as imageLink:
source={{uri: this.state.imageLink}}
I have two presentational components. The first, called Category simply renders a React Native ListView component after doing a bit of set-up work.
The second component, Book, simply displays the data as text, with an image that should be fetched through the network.
Unfortunately, the Image doesn't seem to be displaying at all. Can someone help me get the image to display? Below, please find the Category and Book component definition, as well as a sample of the props being past to Book.
Category.js
import React from 'react';
import { ListView, Text } from 'react-native';
import _ from 'lodash';
import { camelizeKeys } from 'humps';
import Book from './Book';
const Category = ({ category }) => {
let element;
if (!_.isEmpty(category)) { // if data is available
const ds = new ListView.DataSource({ rowHasChanged: (r1, r2) => r1 !== r2 });
const camelCasedBooks = camelizeKeys(category.results.books);
const data = ds.cloneWithRows(camelCasedBooks);
element = (
<ListView
dataSource={data}
enableEmptySections
renderRow={(book) => <Book {...book} />}
/>
);
} else { // if data is not available
element = (
<Text>Loading</Text>
);
}
return element;
};
Category.propTypes = {
category: React.PropTypes.object.isRequired,
};
export default Category;
Book.js
import React from 'react';
import { Image, Text, View } from 'react-native';
const Book = ({ author, bookImage, description, title }) =>
<View>
<Text>
{author}
</Text>
<Text>
{bookImage}
</Text>
<Text>
{description}
</Text>
<Text>
{title}
</Text>
<Image source={{ uri: bookImage }} />
</View>;
Book.propTypes = {
author: React.PropTypes.string.isRequired,
bookImage: React.PropTypes.string.isRequired,
description: React.PropTypes.string.isRequired,
title: React.PropTypes.string.isRequired,
};
export default Book;
Sample Book Props
{
author: "Vi Keeland",
bookImage: "https://s1.nyt.com/du/books/images/9781942215462.jpg",
description: "Reese dismisses a chance encounter with a smug stranger, until he turns out to be her new boss.",
title: "BOSSMAN"
}
When using images that come from a remote location (such as your bookImage you need to set an explicit width and height on the Image's style. This is due to the fact that there is not automatic way for react-native to know how big the images is going to be.
Check the Image documentation for strategies on calculating the Image's size before being rendered. In my experience however simply setting the width and height explicitely is enough most of the times.