I am learning React Native. Following the guide, Getting Started of Facebook (
https://facebook.github.io/react-native/docs/props ). When I tried to make a new component containing an image sometimes works and sometimes not. I have read online that this is due to how they are load, React Native doesn't support dynamic loading of images.
class CuteImage extends Component {
render() {
return (
<View>
<Image source={{uri: 'https://cdn1.medicalnewstoday.com/content/images/articles/322/322868/golden-retriever-puppy.jpg'}} />
</View>
);
}
}
export default class ExampleComponent extends Component {
render() {
return (
<View style={{alignItems: 'center', justifyContent: 'center', flex: "1", flexDirection: "column"}}>
<CuteImage />
</View>
);
}
}
I expected this to work fine because in the Image Component tutorial they did something similar and it had worked ( https://facebook.github.io/react-native/docs/image ) but it throws me the following error:
Failed to construct 'Image': Please use the 'new' operator
Why is this happening? How dynamic and static loading relates to this?
I think you forgot to add dimensions for your image.
The docs say here that you have to provide them when using network and data images.
I attached a screenshot of the result, it works now.
<View>
<Image style={{width: 380, height: 340} } source={{uri: 'https://cdn1.medicalnewstoday.com/content/images/articles/322/322868/golden-retriever-puppy.jpg'}} />
</View>
Cheers.
I tried almost every solution from stackoverflow & github, But unfortunately nothing is working to me !
I need to render image according to an click event. My app is fine when i put the hard coded require value like this
<Image style={{width: 50, height: 50}} source={require('./hulk.png')} />
But it doesn't work if i store the value to a variable and then put this variable into the require like this
let legendPic = `./${this.props.title.toLowerCase()}.png`;
........
<Image style={{width: 50, height: 50}} source={require(legendPic)} />
Here is the my renderDescription method's code
renderDescription = () => {
if(this.props.id === this.props.selectedLibraryId) {
let legendPic = `./${this.props.title.toLowerCase()}.png`;
console.log(legendPic);
return(
<CardSection>
<Image
style={{height: 50, width: 50}}
//source={require(legendPic)}
/>
<Animatable.Text animation='lightSpeedIn'>{this.props.description}</Animatable.Text>
</CardSection>
);
}
}
From the console i get the desired output, but it doesn't work with require.
This is my simple app, when i click any title - description will appear. Left empty space is to show image but i can't solve this issue anymore.
I tried all the possible solution from here stackoverflow
Console Output:
In case you want to see the whole source code Github Link
Thank's
you should include all required assets into an object like this:
const assets = {
key: require('./path-to-image'),
key2: require('./path-to-image'),
key3: require('./path-to-image'),
}
where you name your keys based on your props.title
and then you change your image dynamically from that object like this:
renderDescription = () => {
if(this.props.id === this.props.selectedLibraryId) {
let legendPic = assets[this.props.title.toLowerCase()];
console.log(legendPic);
return(
<CardSection>
<Image
style={{height: 50, width: 50}}
source={legendPic}
/>
<Animatable.Text animation='lightSpeedIn'>{this.props.description}</Animatable.Text>
</CardSection>
);
}
}
I want to load an image in react native. I have gone through many posts but almost every post talks about specifying static / local url’s of image as a source. However , I want to specify it as
src= {this.state.url}
Where this.state.url is assigned a dynamic url (from google images )within the code.
Is it possible ?
Try the Tholle answer
Image source={{ uri: 'https://example.com/image.png' }}
But in your render() make it changes as so :
render(){
var image = ( <Image source={{this.state.url}} /> );
return(
<View>
{image}
</View>
)
}
So whenever your component state will change, render will be called with the updated url I think
I already extracted data from firebase and displaying them. Now i need to display images also. In firebase database i have the same structure as the image below
And I have a folder under my project that contains all images with the exact same name like for an example "Carl.png"
I extracted the photo content in and combined with the rest of the path : "Myproject/img/"+photo+".png" and it's displayed correctly in the screen. But when i try to affect it to image i get errors. And here is the code i tried
<Image style={{width: 50, height: 50}} source={{uri : (this.props.item.imageName)}}> </Image>
and i get this and if i try to put in <Image style={{width: 50, height: 50}} source={{ uri: <Text> this.props.item.imageName </Text> }}> </Image> i get this
and if i put this code source={require(this.props.item.imageName)}
here is what i get: unknown named module
Try loading it using require because you are loading it from a local storage, so your source attribute becomes:
source={ require('./img/'+photo+'.png') }
try with
<Image style={{width: 50, height: 50}} source={{uri : (this.props.item.imageName)}} />
You've got space between opening & closing tag.
actually, React native does not support the dynamic images even if they are stored locally and you just need to make their name dynamically variable. So, the only solution that i was obliged to use was to use a massive switch case and here the code i used:
switch (item.name) {
case 'carl':
return (
<Image source{require('pathUnderProject/carl.png')}/>
);
...
default:
return (
<View >
<Text>{'Null'}</Text>
</View>
);
I know it's not the best solution, but at least i'm sure it's working fine and it won't break in the production environment
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}}