Inspect the render function in the 'RestApi' class

Question

Inspect the render function in the 'RestApi' class

I encountered the following error:

Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.

Check the render method of RestApi.

This is my code in App.js:


        import React from 'react';
        import { StyleSheet } from 'react-native';
        import RestApi from './x/RestApi';

        export default function App() {
            return (
                <RestApi/>
            );
        }

        const styles = StyleSheet.create({
            container: {
                flex: 1,
                color: 'white',
                alignItems: 'center',
                justifyContent: 'center',
            }
        })

This is my code in RestApi.js:


        import axios from 'axios';
        import React, { useState, useEffect } from 'react'
        import { Button, Flatlist, SafeAreaView, ScrollView, StyleSheet, Text, TextInput, TouchableOpacity, View } from 'react-native';

        // RestApi function and related code here...

javascript react-native expo

Answer 1

Answer №1

Your RestApi component is not returning anything because the return statement is nested within the submit function and not being called.

To resolve this issue, you can try unnesting the return statement. In the example below, the useEffect call and other functions have also been unnested for better functionality.

import axios from 'axios'
import React, { useState, useEffect } from 'react'
import {
Button,
Flatlist,
SafeAreaView,
ScrollView,
StyleSheet,
Text,
TextInput,
TouchableOpacity,
View
} from 'react-native'

export default function RestApi() {
const [title, setTitle] = useState('')
const [value, setValue] = useState('')
const [items, setItems] = useState([])
const [button, setButton] = useState('Simpan')
const [selectedUser, setSelectedUser] = useState({})

// Remaining code as per original provided example...

Answer 2

Your RestApi component is not returning anything because the return statement is nested within the submit function and not being called.

To resolve this issue, you can try unnesting the return statement. In the example below, the useEffect call and other functions have also been unnested for better functionality.

import axios from 'axios'
import React, { useState, useEffect } from 'react'
import {
Button,
Flatlist,
SafeAreaView,
ScrollView,
StyleSheet,
Text,
TextInput,
TouchableOpacity,
View
} from 'react-native'

export default function RestApi() {
const [title, setTitle] = useState('')
const [value, setValue] = useState('')
const [items, setItems] = useState([])
const [button, setButton] = useState('Simpan')
const [selectedUser, setSelectedUser] = useState({})

// Remaining code as per original provided example...

Inspect the render function in the 'RestApi' class

Answer №1

Similar questions

Which is better for creating hover effects: CSS3 or JavaScript?

Guide to assigning a value to a model in AngularJS by utilizing a select input with an array of objects

Swap out the CSS line for a PHP conditional statement

React Native's fetch function appears to be non-responsive

Exploring the capabilities of the Scripting.FileSystemObject within the Microsoft Edge browser

The search bar fails to display all pertinent results when only a single letter is inputted

What is the best way to reference a JavaScript or jQuery variable within a PHP variable?

Is there a way to incorporate the req.setHeaders method with the res.redirect method in the same app.get function?

Exclusive gathering to discuss @Input attributes

What could be causing the entire app to malfunction when the Redux Provider tag is used

Utilize CSS to vertically align buttons

The 'exhaustive-deps' warning constantly insists on requiring the complete 'props' object instead of accepting individual 'props' methods as dependencies

issue in jquery: ajax promise not returning any value

Is it possible to check dynamically if a string contains multiple substring matches?

How to incorporate a JavaScript variable into an ERB tag

How can I implement a feature to automatically close a drawer in a React application using the Material UI

CSS Testimonial Slider - Customer Feedback Display

Using Node.js to Insert Data into MySQL

Converting Byte strings to Byte arrays in Node.js using JavaScript

Understanding the concept of callbacks and scopes