React Native error: Element type is invalid: expected a string or a class/function but got: object
I am getting this error and I am having a lot of trouble fixing this.
What I am trying to do here is have 3 different screens and have a tabbar that navigates to each screen.
Here is my index:
import React, { Component } from 'react';
import { AppRegistry, Navigator, StyleSheet, View, Text } from 'react-native';
import Nav from './app/components/Nav';
import Screen from './app/Screen';
import Tabs from 'react-native-tabs'
import SwitchView from './SwitchView';
class Proj extends Component {
constructor(props){
super(props);
}
render(){
var x = "FeedView";
return(
<View style={styles.container}>
<Tabs selected={x} style={{backgroundColor:'white'}}
selectedStyle={{color:'red'}} onSelect={el=> {x = el.props.name}}>
<Text name="FeedView">First</Text>
<Text name="WikiView" selectedIconStyle={{borderTopWidth:2,borderTopColor:'red'}}>Second</Text>
<Text name="BoardView">Third</Text>
</Tabs>
<SwitchView id={x}/>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF',
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
},
instructions: {
textAlign: 'center',
color: '#333333',
marginBottom: 5,
},
})
AppRegistry.registerComponent('Proj', () => Proj);
here is my SwitchView:
import Feed from './app/pages/Feed/Feed';
import Board from './app/pages/Board';
import Wiki from './app/pages/Wiki';
class SwitchView extends Component {
render(){
var { id } = this.props;
switch (id) {
case "FeedView":
return <Feed/>
case "WikiView":
return <Wiki/>
case "BoardView":
return <Board/>
}
}
}
Solution 1:
This is probably caused by some JS module export/import issues in your program, typically for one of the two reasons listed below:
- You forget to export, or you export something incorrectly
- You import something that doesn't exist, or you import something incorrectly
I ran into similar error, but in my case, it is not caused by export
but caused by import
, and I used the import
statement incorrectly to import something that doesn't exist in the module.
In my case, the import
was incorrectly written as:
import { MyComponent } from './MyComponents/MyComponent'
while actually it should be:
import MyComponent from './MyComponents/MyComponent'
And it drove me crazy and took me a whole day to figure it out and I hope this will save several hours for some people.
Solution 2:
Change your SwitchView definition to
export default class SwitchView extends Component...
Solution 3:
Modify your SwitchView to this:
import Feed from './app/pages/Feed/Feed';
import Board from './app/pages/Board';
import Wiki from './app/pages/Wiki';
export default class SwitchView extends Component {
render(){
var { id } = this.props;
switch (id) {
case "FeedView":
return <Feed/>
case "WikiView":
return <Wiki/>
case "BoardView":
return <Board/>
}
}
}