I am trying to pass some parameters from TextInput to the body in Axios. It doesn't display any error or return a status using console.log().
I have several ways to see what could have been the problem. I tried to pass the function to ComponentDiDMount and some other components lifecycles with no success. I have also passed the values directly, used Json.parse(), JSON.encode(), JSON.stringify(), no error and yet not returning status. I know there might be a mistake I am making.
More also, I don't know if I am doing this wrongly. I try to fetch data to a dropdown from which I need to use the key to pass the corresponding id of the selected value to category_id. When the page loads, it fetches "category" i.e a field name with corresponding id to the dropdown but only the corresponding is needed to pass to the Axios.post.
import React, { Component } from 'react';
import {
Text,
TextInput,
View,
Image,
TouchableOpacity,
Button,
StyleSheet} from 'react-native';
import { Dropdown } from 'react-native-material-dropdown';
import axios from 'axios';
export default class CreatePost extends Component {
constructor(props){
super(props)
this.state = {
category: [],
title: '',
cat: '',
author:'',
body:''
}
}
static navigationOptions = ()=> {
return{
title: null,
headerStyle: { backgroundColor: '#1A5276', color:'#fff' },
header:null
}
};
componentWillMount(){
axios.get(`http://localhost/rest_api_myblog/api/category/read.php`)
//.then(json => console.log(json.data.data[0].name))
.then(json => json.data.data)
.then(newData => this.setState({category: newData}))
.catch(error => alert(error))
}
onChangeTextPress(key, value){
this.setState((prevState) => {
//let selected = Object.assign({}, prevState.selected);
let selected = Object.assign({},prevState.selected);
selected[key] = value;
return { selected };
}, () => {
this.setState({ cat: this.state.selected[key]});
// console.log(cat);
});
}
onCreate = event => {
event.preventDefault();
const body = {
author :this.state.author,
title : this.state.title,
body : this.state.body,
category_id :this.state.cat
};
axios.post(`http://localhost/rest_api_myblog/api/post/create.php`, JSON.parse(body))
.then(res => {console.log(res)
})
.catch(e => console.log(e));
}
render() {
const data = this.state.category.map((cat, i) =>({
value: cat.name,
key: i
}));
return (
<View style= {styles.container}>
<View><Image style={styles.image} source={require('../images/blog.jpg')}/>
<Text style={styles.header}>Create Post</Text></View>
<View style={{alignItems:'center'}}>
<Text style= {styles.label}>Title</Text>
<TextInput
style={styles.textbox}
placeholder="Title"
onChangeText= {(title)=>{
this.setState({title});
}}
value={this.state.title}/>
<Text style= {styles.label}>Author</Text>
<TextInput
style={styles.textbox}
name='author'
placeholder="Author"
onChangeText= {(text)=>{
this.setState({author: text});
}}
value={this.state.author}
/>
<Text style= {styles.label}>Category</Text>
<Dropdown
dropdownOffset={{top:5, left: 0 }}
containerStyle={{
borderWidth:1,
borderColor:'lightgrey',
borderRadius:13, width:300, height: 40,
paddingLeft:6,
backgroundColor:'#fff'}}
rippleCentered={true}
inputContainerStyle={{ borderBottomColor: 'transparent' }}
data = {data}
valueExtractor={({value})=> value}
onChangeText={(value, key)=>{this.onChangeTextPress( value, key)}}
/>
<Text style= {styles.label}>Body</Text>
<TextInput
style={styles.textbox}
multiline = {true}
numberOfLines = {4}
placeholder="Body"
onChangeText= {(body)=>{
this.setState({body});
}}
value={this.state.body}
/>
<TouchableOpacity style={styles.buttonContainer}
onPress = {()=> {this.onCreate }}
>
<Text style={styles.buttonText}>Create</Text>
</TouchableOpacity>
</View>
</View>
)
}
}
What I actually want is a post method based on the TextInput values entered by the users. More also, the corresponding ID of the selected dropdown value be passed instead of the actual value.
Thank you so much for your assistance.
From what I can read from the code, the problem seems to be in the way you call your onCreate method.
You are doing:
<TouchableOpacity style={styles.buttonContainer} onPress={()=> {this.onCreate }}>
<Text style={styles.buttonText}>Create</Text>
</TouchableOpacity>
Where you should be doing either:
<TouchableOpacity style={styles.buttonContainer} onPress={this.onCreate}>
<Text style={styles.buttonText}>Create</Text>
</TouchableOpacity>
Or:
<TouchableOpacity style={styles.buttonContainer} onPress={() => this.onCreate()}>
<Text style={styles.buttonText}>Create</Text>
</TouchableOpacity>
I am trying to make a search in my db items but all I receive is the following error: Invariant Violation: 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.
Here is my code where I am creating the search page. JobItem I am using it in jobs page and everything is displaying correctly but here when I put the first letter in the search box I am getting the error.
import JobItem from './JobItem';
const { width, height } = Dimensions.get('window')
class SearchBar extends Component {
constructor(props) {
super(props)
this.state = {
text: '',
data: ''
}
}
static navigationOptions = {
headerVisible: false
}
filter(text) {
const data = this.props.jobs;
console.log(data);
const newData = data.filter(function (job) {
const itemData = job.title.toUpperCase()
const textData = text.toUpperCase()
return itemData.indexOf(textData) > -1
})
this.setState({
data: newData,
text: text,
})
}
deleteData() {
this.setState({ text: '', data: '' })
}
_renderJobs(job) {
return this.props.jobs.map((job) => {
return (
<JobItem
key={job._id}
title={job.title}
shortDescription={job.shortDescription}
logo={job.avatar}
company={job.company}
id={job._id}
city={job.location[0].city}
postDate={job.postDate}
dispatch={this.props.dispatch}
onPress={() => this.onJobDetails(job)}
/>
)
})
}
render() {
const { goBack } = this.props.navigation
return (
<View style={styles.container}>
<View style={styles.header}>
<FontAwesome
name="magnify"
color="grey"
size={20}
style={styles.searchIcon}
/>
<TextInput
value={this.state.text}
onChangeText={(text) => this.filter(text)}
style={styles.input}
placeholder="Search"
placeholderTextColor="grey"
keyboardAppearance="dark"
autoFocus={true}
/>
{this.state.text ?
<TouchableWithoutFeedback onPress={() => this.deleteData()}>
<FontAwesome
name="clock-outline"
color="grey"
size={20}
style={styles.iconInputClose}
/>
</TouchableWithoutFeedback>
: null}
<TouchableWithoutFeedback style={styles.cancelButton} onPress={() => goBack()}>
<View style={styles.containerButton}>
<Text style={styles.cancelButtonText}>Cancel</Text>
</View>
</TouchableWithoutFeedback>
</View>
<ScrollView>
<FlatList
style={{ marginHorizontal: 5 }}
data={this.state.data}
numColumns={3}
columnWrapperStyle={{ marginTop: 5, marginLeft: 5 }}
renderItem={({ job }) => this._renderJobs(job)}
/>
</ScrollView>
</View>
)
}
}
Please anyone help me with this.
I'm trying to get the value from TextInput, but if I use the onChangeText the keyboard will collapse immediately so the user won't be able to write in the input.
But if I use the onChange and preventDefault, I still am not able to take the text from the input so this.state.userSearch is empty
class CustomName extends React.Component {
constructor(...args) {
super(...args);
this.state = {
userSearch: ""
};
}
renderSearchInput() {
if (this.state.search) {
return (
<View style={styles.outerContainer}>
<TextInput
style={[
styles.textInput,
{ height: Platform.OS == "android" ? 40 : 20 }
]}
underlineColorAndroid="transparent"
placeholderTextColor="rgba(0,0,0,0.5)"
autoCapitalize="none"
// onChangeText={(text) => this.setState({userSearch: text })}
value={this.state.text}
onChange={evt => this.onSearchTerm.bind(this)}
onSubmitEditing={this.searchMessages.bind(this)}
/>
</TextInput>
</View>
)
}
}
onSearchTerm(evt) {
this.setState(
Object.assign({}, this.state, { userSearch: evt.nativeEvent.text })
);
evt.preventDefault();
console.log(evt);
}
The search text input is rendered in the FlatList as ListHeaderComponent:
<List style={{ flex: 1 }}>
<FlatList
..
data={messages}
..
ListHeaderComponent={this.renderSearchInput.bind(this)}
keyboardShouldPersistTaps="always"
/>
</List>
How can I prevent the keyboard from collapsing(disappear) while receiving the text from the input and store it in this.state.userSearch?
I'm having a form in my application where I want the user to be able to go to the next TextInput by clicking the "Next" return button.
My Input component:
export default class Input extends Component {
focusNextField = (nextField) => {
console.log('NEXT FIELD:', nextField);
this.refs[nextField].focus();
}
render() {
var keyboardType = this.props.keyboardType || 'default';
var style = [styles.textInput, this.props.style];
if (this.props.hasError) style.push(styles.error);
return (
<View style={styles.textInputContainer}>
<TextInput
placeholder={this.props.placeholder}
onChangeText={this.props.onChangeText}
style={style}
blurOnSubmit={false}
ref={this.props.reference}
returnKeyType= {this.props.returnType}
onSubmitEditing={() => this.focusNextField(this.props.fieldRef)}
secureTextEntry={this.props.isPassword}
value={this.props.value}
keyboardType={keyboardType}
underlineColorAndroid="transparent" />
{this.props.hasError && this.props.errorMessage ? <Text style={{ color: 'red' }}>{this.props.errorMessage}</Text> : null}
</View>
);
}
}
And how it is used:
<Input onChangeText={(email) => this.setState({ email })} value={this.state.email} returnType={"next"} reference={'1'} fieldRef={'2'} keyboardType="email-address" />
<Text style={{ color: '#fff', marginTop: 10, }}>Password</Text>
<Input onChangeText={(password) => this.setState({ password })} value={this.state.password} returnType={"done"}
reference={'2'} fieldRef={'2'} isPassword={true} />
But I get the error:
undefined is not an object (evaluating _this.refs[nextField].focus)
Not sure if you are still trying to do this but for anyone else who has the problem, please do the following :
Add this code to your imports (anywhere in your imports)
import { findNodeHandle } from 'react-native';
import TextInputState from 'react-native/lib/TextInputState';
export function focusTextInput(node) {
try {
TextInputState.focusTextInput(findNodeHandle(node));
} catch(e) {
console.log("Couldn't focus text input: ", e.message)
}
};
Add the following lines to your constructor
this.focusNextField = this.focusNextField.bind(this);
this.inputs = {};
Add the following function to your class
focusNextField(id) {
this.inputs[id].focus();
}
Edit your TextInput as follow :
<TextInput
onSubmitEditing={() => {this.focusNextField('two');}}
ref={ input => {this.inputs['one'] = input;}}
/>
<TextInput
onSubmitEditing={() => {this.focusNextField('three');}}
ref={ input => {this.inputs['two'] = input;}}
/>
....
Here is the source of that answer
Worked in 0.45 for me.
I am stuck with a very simple problem. I have login form with username, password and button. In my button handler, I try to get the textinput value. But always get undefined value. Am I missing something?
render() {
<ExScreen
headerColor={this.state.headerColor}
scrollEnabled={this.state.enableScroll}
style={styles.container} >
<View >
<View >
<View style={[styles.inputContainer]} >
<TextInput
ref= "username"
onChangeText={(text) => this.setState({text})}
value={this.state.username}
/>
</View>
<Button style={{color: 'white', marginTop: 30, borderWidth: 1, borderColor: 'white', marginLeft: 20*vw, marginRight: 20*vw, height: 40, padding: 10}}
onPress={this._handlePress.bind(this)}>
Sign In
</Button>
...
_handlePress(event) {
var username=this.refs.username.value;
The quick and less optimized way to do this is by using arrow function inside your onChangeText callback, by passing username as your argument in your onChangeText callback.
<TextInput
ref= {(el) => { this.username = el; }}
onChangeText={(username) => this.setState({username})}
value={this.state.username}
/>
then in your _handlePress method
_handlePress(event) {
let username=this.state.username;
}
But this has several drawbacks!!!
On every render of this component a new arrow function is created.
If the child component is a PureComponent it will force re-renders unnecessarily, this causes huge performance issue especially when dealing with large lists, table, or component iterated over large numbers. More on this in React Docs
Best practice is to use a handler like handleInputChange and bind ```this`` in the constructor.
...
constructor(props) {
super(props);
this.handleChange= this.handleChange.bind(this);
}
...
handleChange(event = {}) {
const name = event.target && event.target.name;
const value = event.target && event.target.value;
this.setState([name]: value);
}
...
render() {
...
<TextInput
name="username"
onChangeText={this.handleChange}
value={this.state.username}
/>
...
}
...
Or if you are using es6 class property shorthand which autobinds this. But this has drawbacks, when it comes to testing and performance. Read More Here
...
handleChange= (event = {}) => {
const name = event.target && event.target.name;
const value = event.target && event.target.value;
this.setState([name]: value);
}
...
render() {
...
<TextInput
name="username"
onChangeText={this.handleChange}
value={this.state.username}
/>
...
}
...
You should use States to store the value of input fields.
https://facebook.github.io/react-native/docs/state.html
To update state values use setState
onChangeText={(value) => this.setState({username: value})}
and get input value like this
this.state.username
Sample code
export default class Login extends Component {
state = {
username: 'demo',
password: 'demo'
};
<Text style={Style.label}>User Name</Text>
<TextInput
style={Style.input}
placeholder="UserName"
onChangeText={(value) => this.setState({username: value})}
value={this.state.username}
/>
<Text style={Style.label}>Password</Text>
<TextInput
style={Style.input}
placeholder="Password"
onChangeText={(value) => this.setState({password: value})}
value={this.state.password}
/>
<Button
title="LOGIN"
onPress={() =>
{
if(this.state.username.localeCompare('demo')!=0){
ToastAndroid.show('Invalid UserName',ToastAndroid.SHORT);
return;
}
if(this.state.password.localeCompare('demo')!=0){
ToastAndroid.show('Invalid Password',ToastAndroid.SHORT);
return;
}
//Handle LOGIN
}
}
/>
In React Native 0.43: (Maybe later than 0.43 is OK.)
_handlePress(event) {
var username= this.refs.username._lastNativeText;
If you are like me and doesn't want to use or pollute state for one-off components here's what I did:
import React from "react";
import { Text, TextInput } from "react-native";
export default class Registration extends Component {
_register = () => {
const payload = {
firstName: this.firstName,
/* other values */
}
console.log(payload)
}
render() {
return (
<RegisterLayout>
<Text style={styles.welcome}>
Register
</Text>
<TextInput
placeholder="First Name"
onChangeText={(text) => this.firstName = text} />
{/*More components...*/}
<CustomButton
backgroundColor="steelblue"
handlePress={this._register}>
Submit
</CustomButton>
</RegisterLayout>
)
}
}
export default class App extends Component {
state = { username: '', password: '' }
onChangeText = (key, val) => {
this.setState({ [key]: val})
}
render() {
return (
<View style={styles.container}>
<Text>Login Form</Text>
<TextInput
placeholder='Username'
onChangeText={val => this.onChangeText('username', val)}
style={styles.input}
/>
<TextInput
placeholder='Password'
onChangeText={val => this.onChangeText('password', val)}
style={styles.input}
secureTextEntry={true}
/>
</View>
);
}
}
Hope this will solve your problem
This work for me
<Form>
<TextInput
style={{height: 40}}
placeholder="userName"
onChangeText={(text) => this.userName = text}
/>
<TextInput
style={{height: 40}}
placeholder="Password"
onChangeText={(text) => this.Password = text}
/>
<Button
title="Sign in!"
onPress={this._signInAsync}
/>
</Form>
and
_signInAsync = async () => {
console.log(this.userName)
console.log(this.Password)
};
Please take care on how to use setState(). The correct form is
this.setState({
Key: Value,
});
And so I would do it as follows:
onChangeText={(event) => this.setState({username:event.nativeEvent.text})}
...
var username=this.state.username;
Try Console log the object and you will find your entered text inside nativeEvent.text
example:
handelOnChange = (enteredText) => {
console.log(enteredText.nativeEvent.text)
}
render()
return (
<SafeAreaView>
<TextInput
onChange={this.handelOnChange}
>
</SafeAreaView>
)
constructor(props) {
super(props);
this.state ={
commentMsg: ''
}
}
onPress = () => {
alert("Hi " +this.state.commentMsg)
}
<View style={styles.sendCommentContainer}>
<TextInput
style={styles.textInput}
multiline={true}
onChangeText={(text) => this.setState({commentMsg: text})}
placeholder ='Comment'/>
<Button onPress={this.onPress}
title="OK!"
color="#841584"
/>
</TouchableOpacity>
</View>
Simply do it.
this.state={f_name:""};
textChangeHandler = async (key, val) => {
await this.setState({ [key]: val });
}
<Textfield onChangeText={val => this.textChangeHandler('f_name', val)}>
Every thing is OK for me by this procedure:
<Input onChangeText={this.inputOnChangeText} />
and also:
inputOnChangeText = (e) => {
this.setState({
username: e
})
}
React Native Latest -> Simple and easy solution using state based approach.
const [userEmail, setUserEmail] = useState("");
<TextInput
value={userEmail}
style={styles.textInputStyle}
placeholder="Email"
placeholderTextColor="steelblue"
onChangeText={(userEmail) => setUserEmail(userEmail)}
/>
If you set the text state, why not use that directly?
_handlePress(event) {
var username=this.state.text;
Of course the variable naming could be more descriptive than 'text' but your call.
There is huge difference between onChange and onTextChange prop of <TextInput />. Don't be like me and use onTextChange which returns string and don't use onChange which returns full objects.
I feel dumb for spending like 1 hour figuring out where is my value.
You dont need to make a new function for taht.
just make a new useState and use it in onchange.
const UselessTextInput = () => {
const [text, onChangeText] = React.useState("Useless Text");
const [number, onChangeNumber] = React.useState(null);
return (
<SafeAreaView>
<TextInput
style={styles.input}
onChangeText={onChangeText}
value={text}
/>
<TextInput
style={styles.input}
onChangeText={onChangeNumber}
value={number}
placeholder="useless placeholder"
keyboardType="numeric"
/>
</SafeAreaView>
);
};
This piece of code worked for me. What I was missing was I was not passing 'this' in button action:
onPress={this._handlePress.bind(this)}>
--------------
_handlePress(event) {
console.log('Pressed!');
var username = this.state.username;
var password = this.state.password;
console.log(username);
console.log(password);
}
render() {
return (
<View style={styles.container}>
<TextInput
ref="usr"
style={{height: 40, borderColor: 'gray', borderWidth: 1 , marginTop: 10 , padding : 10 , marginLeft : 5 , marginRight : 5 }}
placeHolder= "Enter username "
placeholderTextColor = '#a52a2a'
returnKeyType = {"next"}
autoFocus = {true}
autoCapitalize = "none"
autoCorrect = {false}
clearButtonMode = 'while-editing'
onChangeText={(text) => {
this.setState({username:text});
}}
onSubmitEditing={(event) => {
this.refs.psw.focus();
}}
/>
<TextInput
ref="psw"
style={{height: 40, borderColor: 'gray', borderWidth: 1 , marginTop: 10,marginLeft : 5 , marginRight : 5}}
placeholder= "Enter password"
placeholderTextColor = '#a52a2a'
autoCapitalize = "none"
autoCorrect = {false}
returnKeyType = {'done'}
secureTextEntry = {true}
clearButtonMode = 'while-editing'
onChangeText={(text) => {
this.setState({password:text});
}}
/>
<Button
style={{borderWidth: 1, borderColor: 'blue'}}
onPress={this._handlePress.bind(this)}>
Login
</Button>
</View>
);``
}
}
User in the init of class:
constructor() {
super()
this.state = {
email: ''
}
}
Then in some function:
handleSome = () => {
console.log(this.state.email)
};
And in the input:
<TextInput onChangeText={(email) => this.setState({email})}/>
Did you try
var username=this.state.username;