React Component array not updating
0
I'm learning react, and I'm stuck with not updating list components.
The component shows all of the list elements that I add manually, but not rendering any changes.
I searched a lot for solutions.
All of my change handlers are binded, the setState inside handleSubmit should update ClockRow...
My App.js:
import React, { Component } from 'react';
import Clock from './Clock';
import ClockRow from './ClockRow';
class App extends Component {
constructor(props) {
super(props);
this.state = {items: , tle: 'Teszt', ival: 200};
this.handleChangeTitle = this.handleChangeTitle.bind(this);
this.handleChangeInterval = this.handleChangeInterval.bind(this);
this.handleSubmit = this.handleSubmit.bind(this);
}
handleChangeTitle(event) {
this.setState({tle: event.target.value});
}
handleChangeInterval(event) {
this.setState({ival: event.target.value});
}
handleSubmit(event) {
if(this.state.tle.length > 0 && this.state.ival > 9){
this.setState({items: [...this.state.items, <Clock interval={this.state.ival} title={this.state.tle} />]});
}
event.preventDefault();
}
render(){
return (
<div>
<div className="row">
<h1 className="col text-center">Hello, React!</h1>
</div>
<div className="row">
<form onSubmit={this.handleSubmit}>
<label>
Title: <input type="text" name="tle" value={this.state.tle} onChange={this.handleChangeTitle} />
</label>
<label>
Interval: <input type="number" name="ival" value={this.state.ival} onChange={this.handleChangeInterval} />
</label>
<input type="submit" value="Add" />
</form>
</div>
<ClockRow clockItems={this.state.items} />
</div>
);
}
}
export default App;
My ClockRow.js:
import React, { Component } from 'react';
class ClockRow extends Component{
constructor(props){
super(props);
this.state = {clocks: props.clockItems.map((x, i) => <div className="col" key={i}>{x}</div>) }
}
render(){
return(<div className="row">{this.state.clocks}</div>
)};
}
export default ClockRow;
My Clock.js:
import React, { Component } from 'react';
import {Card, CardTitle, CardBody, CardFooter} from 'reactstrap';
class Clock extends Component {
constructor(props){
super(props);
this.state = {counter: 0, interval: parseInt(props.interval), title: props.title};
}
componentDidMount() {
this.timerID = setInterval(() => this.tick(), this.state.interval);
}
componentWillUnmount() {
clearInterval(this.timerID);
}
tick() {
this.setState((state) => ({
counter: state.counter + 1
}));
}
render() {
return (
<Card>
<CardTitle>{this.state.title}</CardTitle>
<CardBody>{this.state.counter}</CardBody>
<CardFooter>{this.state.interval}</CardFooter>
</Card>
);
}
}
export default Clock;
reactjs
asked Nov 11 at 20:15
Sarkanyolo
53
add a comment |
0
I'm learning react, and I'm stuck with not updating list components.
The component shows all of the list elements that I add manually, but not rendering any changes.
I searched a lot for solutions.
All of my change handlers are binded, the setState inside handleSubmit should update ClockRow...
My App.js:
import React, { Component } from 'react';
import Clock from './Clock';
import ClockRow from './ClockRow';
class App extends Component {
constructor(props) {
super(props);
this.state = {items: , tle: 'Teszt', ival: 200};
this.handleChangeTitle = this.handleChangeTitle.bind(this);
this.handleChangeInterval = this.handleChangeInterval.bind(this);
this.handleSubmit = this.handleSubmit.bind(this);
}
handleChangeTitle(event) {
this.setState({tle: event.target.value});
}
handleChangeInterval(event) {
this.setState({ival: event.target.value});
}
handleSubmit(event) {
if(this.state.tle.length > 0 && this.state.ival > 9){
this.setState({items: [...this.state.items, <Clock interval={this.state.ival} title={this.state.tle} />]});
}
event.preventDefault();
}
render(){
return (
<div>
<div className="row">
<h1 className="col text-center">Hello, React!</h1>
</div>
<div className="row">
<form onSubmit={this.handleSubmit}>
<label>
Title: <input type="text" name="tle" value={this.state.tle} onChange={this.handleChangeTitle} />
</label>
<label>
Interval: <input type="number" name="ival" value={this.state.ival} onChange={this.handleChangeInterval} />
</label>
<input type="submit" value="Add" />
</form>
</div>
<ClockRow clockItems={this.state.items} />
</div>
);
}
}
export default App;
My ClockRow.js:
import React, { Component } from 'react';
class ClockRow extends Component{
constructor(props){
super(props);
this.state = {clocks: props.clockItems.map((x, i) => <div className="col" key={i}>{x}</div>) }
}
render(){
return(<div className="row">{this.state.clocks}</div>
)};
}
export default ClockRow;
My Clock.js:
import React, { Component } from 'react';
import {Card, CardTitle, CardBody, CardFooter} from 'reactstrap';
class Clock extends Component {
constructor(props){
super(props);
this.state = {counter: 0, interval: parseInt(props.interval), title: props.title};
}
componentDidMount() {
this.timerID = setInterval(() => this.tick(), this.state.interval);
}
componentWillUnmount() {
clearInterval(this.timerID);
}
tick() {
this.setState((state) => ({
counter: state.counter + 1
}));
}
render() {
return (
<Card>
<CardTitle>{this.state.title}</CardTitle>
<CardBody>{this.state.counter}</CardBody>
<CardFooter>{this.state.interval}</CardFooter>
</Card>
);
}
}
export default Clock;
reactjs
asked Nov 11 at 20:15
Sarkanyolo
53
Put regular data in your component state and derive the JSX from that data in the render method. You generally don't want to storeReact.createElementresults in your state. If you take props and add it to your state, the state will not update when the props update. It's therefore a good idea to just use the props directly if you can, and the component will keep itself updated automatically.
– Tholle
Nov 11 at 20:19
add a comment |
0
0
0
I'm learning react, and I'm stuck with not updating list components.
The component shows all of the list elements that I add manually, but not rendering any changes.
I searched a lot for solutions.
All of my change handlers are binded, the setState inside handleSubmit should update ClockRow...
My App.js:
import React, { Component } from 'react';
import Clock from './Clock';
import ClockRow from './ClockRow';
class App extends Component {
constructor(props) {
super(props);
this.state = {items: , tle: 'Teszt', ival: 200};
this.handleChangeTitle = this.handleChangeTitle.bind(this);
this.handleChangeInterval = this.handleChangeInterval.bind(this);
this.handleSubmit = this.handleSubmit.bind(this);
}
handleChangeTitle(event) {
this.setState({tle: event.target.value});
}
handleChangeInterval(event) {
this.setState({ival: event.target.value});
}
handleSubmit(event) {
if(this.state.tle.length > 0 && this.state.ival > 9){
this.setState({items: [...this.state.items, <Clock interval={this.state.ival} title={this.state.tle} />]});
}
event.preventDefault();
}
render(){
return (
<div>
<div className="row">
<h1 className="col text-center">Hello, React!</h1>
</div>
<div className="row">
<form onSubmit={this.handleSubmit}>
<label>
Title: <input type="text" name="tle" value={this.state.tle} onChange={this.handleChangeTitle} />
</label>
<label>
Interval: <input type="number" name="ival" value={this.state.ival} onChange={this.handleChangeInterval} />
</label>
<input type="submit" value="Add" />
</form>
</div>
<ClockRow clockItems={this.state.items} />
</div>
);
}
}
export default App;
My ClockRow.js:
import React, { Component } from 'react';
class ClockRow extends Component{
constructor(props){
super(props);
this.state = {clocks: props.clockItems.map((x, i) => <div className="col" key={i}>{x}</div>) }
}
render(){
return(<div className="row">{this.state.clocks}</div>
)};
}
export default ClockRow;
My Clock.js:
import React, { Component } from 'react';
import {Card, CardTitle, CardBody, CardFooter} from 'reactstrap';
class Clock extends Component {
constructor(props){
super(props);
this.state = {counter: 0, interval: parseInt(props.interval), title: props.title};
}
componentDidMount() {
this.timerID = setInterval(() => this.tick(), this.state.interval);
}
componentWillUnmount() {
clearInterval(this.timerID);
}
tick() {
this.setState((state) => ({
counter: state.counter + 1
}));
}
render() {
return (
<Card>
<CardTitle>{this.state.title}</CardTitle>
<CardBody>{this.state.counter}</CardBody>
<CardFooter>{this.state.interval}</CardFooter>
</Card>
);
}
}
export default Clock;
reactjs
asked Nov 11 at 20:15
Sarkanyolo
53
I'm learning react, and I'm stuck with not updating list components.
The component shows all of the list elements that I add manually, but not rendering any changes.
I searched a lot for solutions.
All of my change handlers are binded, the setState inside handleSubmit should update ClockRow...
My App.js:
import React, { Component } from 'react';
import Clock from './Clock';
import ClockRow from './ClockRow';
class App extends Component {
constructor(props) {
super(props);
this.state = {items: , tle: 'Teszt', ival: 200};
this.handleChangeTitle = this.handleChangeTitle.bind(this);
this.handleChangeInterval = this.handleChangeInterval.bind(this);
this.handleSubmit = this.handleSubmit.bind(this);
}
handleChangeTitle(event) {
this.setState({tle: event.target.value});
}
handleChangeInterval(event) {
this.setState({ival: event.target.value});
}
handleSubmit(event) {
if(this.state.tle.length > 0 && this.state.ival > 9){
this.setState({items: [...this.state.items, <Clock interval={this.state.ival} title={this.state.tle} />]});
}
event.preventDefault();
}
render(){
return (
<div>
<div className="row">
<h1 className="col text-center">Hello, React!</h1>
</div>
<div className="row">
<form onSubmit={this.handleSubmit}>
<label>
Title: <input type="text" name="tle" value={this.state.tle} onChange={this.handleChangeTitle} />
</label>
<label>
Interval: <input type="number" name="ival" value={this.state.ival} onChange={this.handleChangeInterval} />
</label>
<input type="submit" value="Add" />
</form>
</div>
<ClockRow clockItems={this.state.items} />
</div>
);
}
}
export default App;
My ClockRow.js:
import React, { Component } from 'react';
class ClockRow extends Component{
constructor(props){
super(props);
this.state = {clocks: props.clockItems.map((x, i) => <div className="col" key={i}>{x}</div>) }
}
render(){
return(<div className="row">{this.state.clocks}</div>
)};
}
export default ClockRow;
My Clock.js:
import React, { Component } from 'react';
import {Card, CardTitle, CardBody, CardFooter} from 'reactstrap';
class Clock extends Component {
constructor(props){
super(props);
this.state = {counter: 0, interval: parseInt(props.interval), title: props.title};
}
componentDidMount() {
this.timerID = setInterval(() => this.tick(), this.state.interval);
}
componentWillUnmount() {
clearInterval(this.timerID);
}
tick() {
this.setState((state) => ({
counter: state.counter + 1
}));
}
render() {
return (
<Card>
<CardTitle>{this.state.title}</CardTitle>
<CardBody>{this.state.counter}</CardBody>
<CardFooter>{this.state.interval}</CardFooter>
</Card>
);
}
}
export default Clock;
reactjs
reactjs
asked Nov 11 at 20:15
Sarkanyolo
53
asked Nov 11 at 20:15
Sarkanyolo
53
asked Nov 11 at 20:15
Sarkanyolo
53
asked Nov 11 at 20:15
Sarkanyolo
53
asked Nov 11 at 20:15
Sarkanyolo
53
53
Put regular data in your component state and derive the JSX from that data in the render method. You generally don't want to storeReact.createElementresults in your state. If you take props and add it to your state, the state will not update when the props update. It's therefore a good idea to just use the props directly if you can, and the component will keep itself updated automatically.
– Tholle
Nov 11 at 20:19
add a comment |
Put regular data in your component state and derive the JSX from that data in the render method. You generally don't want to storeReact.createElementresults in your state. If you take props and add it to your state, the state will not update when the props update. It's therefore a good idea to just use the props directly if you can, and the component will keep itself updated automatically.
– Tholle
Nov 11 at 20:19
Put regular data in your component state and derive the JSX from that data in the render method. You generally don't want to store
React.createElement results in your state. If you take props and add it to your state, the state will not update when the props update. It's therefore a good idea to just use the props directly if you can, and the component will keep itself updated automatically.– Tholle
Nov 11 at 20:19
Put regular data in your component state and derive the JSX from that data in the render method. You generally don't want to store
React.createElement results in your state. If you take props and add it to your state, the state will not update when the props update. It's therefore a good idea to just use the props directly if you can, and the component will keep itself updated automatically.– Tholle
Nov 11 at 20:19
add a comment |
1 Answer
1
active
oldest
votes
0
CodeSandbox:
https://codesandbox.io/s/zxlzzv05n3
- ClockRow.js is surplus
- Clock.js is not changed
App.js is changed, and "React styled":
import React, { Component } from "react";
import Clock from "./Clock";
class App extends Component {
constructor(props) {
super(props);
this.state = { items: , inputTle: "Teszt", inputIval: 200 };
}
handleChangeTitle = event => {
this.setState({ inputTle: event.target.value });
};
handleChangeInterval = event => {
this.setState({ inputIval: event.target.value });
};
handleSubmit = event => {
console.log(this.state);
if (this.state.inputTle.length > 0 && this.state.inputIval > 9) {
this.setState(prevState => {
return {
items: [
...prevState.items,
{
title: this.state.inputTle,
interval: this.state.inputIval
}
]
};
});
}
event.preventDefault();
};
render() {
return (
<div>
<div className="row">
<h1 className="col text-center">Hello, React!</h1>
</div>
<div className="row">
<form onSubmit={this.handleSubmit}>
<label>
Title:{" "}
<input
type="text"
name="tle"
value={this.state.inputTle}
onChange={this.handleChangeTitle}
/>
</label>
<label>
Interval:{" "}
<input
type="number"
name="ival"
value={this.state.inputIval}
onChange={this.handleChangeInterval}
/>
</label>
<input type="submit" value="Add" />
</form>
</div>
<div className="row">
{this.state.items.map((item, index) => (
<div className="col" key={index}>
<Clock {...item} />
</div>
))}
</div>
</div>
);
}
}
export default App;
answered Nov 11 at 22:02
Boris Traljić
464310
add a comment |
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1 Answer
1
active
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votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
0
CodeSandbox:
https://codesandbox.io/s/zxlzzv05n3
- ClockRow.js is surplus
- Clock.js is not changed
App.js is changed, and "React styled":
import React, { Component } from "react";
import Clock from "./Clock";
class App extends Component {
constructor(props) {
super(props);
this.state = { items: , inputTle: "Teszt", inputIval: 200 };
}
handleChangeTitle = event => {
this.setState({ inputTle: event.target.value });
};
handleChangeInterval = event => {
this.setState({ inputIval: event.target.value });
};
handleSubmit = event => {
console.log(this.state);
if (this.state.inputTle.length > 0 && this.state.inputIval > 9) {
this.setState(prevState => {
return {
items: [
...prevState.items,
{
title: this.state.inputTle,
interval: this.state.inputIval
}
]
};
});
}
event.preventDefault();
};
render() {
return (
<div>
<div className="row">
<h1 className="col text-center">Hello, React!</h1>
</div>
<div className="row">
<form onSubmit={this.handleSubmit}>
<label>
Title:{" "}
<input
type="text"
name="tle"
value={this.state.inputTle}
onChange={this.handleChangeTitle}
/>
</label>
<label>
Interval:{" "}
<input
type="number"
name="ival"
value={this.state.inputIval}
onChange={this.handleChangeInterval}
/>
</label>
<input type="submit" value="Add" />
</form>
</div>
<div className="row">
{this.state.items.map((item, index) => (
<div className="col" key={index}>
<Clock {...item} />
</div>
))}
</div>
</div>
);
}
}
export default App;
answered Nov 11 at 22:02
Boris Traljić
464310
add a comment |
0
CodeSandbox:
https://codesandbox.io/s/zxlzzv05n3
- ClockRow.js is surplus
- Clock.js is not changed
App.js is changed, and "React styled":
import React, { Component } from "react";
import Clock from "./Clock";
class App extends Component {
constructor(props) {
super(props);
this.state = { items: , inputTle: "Teszt", inputIval: 200 };
}
handleChangeTitle = event => {
this.setState({ inputTle: event.target.value });
};
handleChangeInterval = event => {
this.setState({ inputIval: event.target.value });
};
handleSubmit = event => {
console.log(this.state);
if (this.state.inputTle.length > 0 && this.state.inputIval > 9) {
this.setState(prevState => {
return {
items: [
...prevState.items,
{
title: this.state.inputTle,
interval: this.state.inputIval
}
]
};
});
}
event.preventDefault();
};
render() {
return (
<div>
<div className="row">
<h1 className="col text-center">Hello, React!</h1>
</div>
<div className="row">
<form onSubmit={this.handleSubmit}>
<label>
Title:{" "}
<input
type="text"
name="tle"
value={this.state.inputTle}
onChange={this.handleChangeTitle}
/>
</label>
<label>
Interval:{" "}
<input
type="number"
name="ival"
value={this.state.inputIval}
onChange={this.handleChangeInterval}
/>
</label>
<input type="submit" value="Add" />
</form>
</div>
<div className="row">
{this.state.items.map((item, index) => (
<div className="col" key={index}>
<Clock {...item} />
</div>
))}
</div>
</div>
);
}
}
export default App;
answered Nov 11 at 22:02
Boris Traljić
464310
add a comment |
0
0
0
CodeSandbox:
https://codesandbox.io/s/zxlzzv05n3
- ClockRow.js is surplus
- Clock.js is not changed
App.js is changed, and "React styled":
import React, { Component } from "react";
import Clock from "./Clock";
class App extends Component {
constructor(props) {
super(props);
this.state = { items: , inputTle: "Teszt", inputIval: 200 };
}
handleChangeTitle = event => {
this.setState({ inputTle: event.target.value });
};
handleChangeInterval = event => {
this.setState({ inputIval: event.target.value });
};
handleSubmit = event => {
console.log(this.state);
if (this.state.inputTle.length > 0 && this.state.inputIval > 9) {
this.setState(prevState => {
return {
items: [
...prevState.items,
{
title: this.state.inputTle,
interval: this.state.inputIval
}
]
};
});
}
event.preventDefault();
};
render() {
return (
<div>
<div className="row">
<h1 className="col text-center">Hello, React!</h1>
</div>
<div className="row">
<form onSubmit={this.handleSubmit}>
<label>
Title:{" "}
<input
type="text"
name="tle"
value={this.state.inputTle}
onChange={this.handleChangeTitle}
/>
</label>
<label>
Interval:{" "}
<input
type="number"
name="ival"
value={this.state.inputIval}
onChange={this.handleChangeInterval}
/>
</label>
<input type="submit" value="Add" />
</form>
</div>
<div className="row">
{this.state.items.map((item, index) => (
<div className="col" key={index}>
<Clock {...item} />
</div>
))}
</div>
</div>
);
}
}
export default App;
answered Nov 11 at 22:02
Boris Traljić
464310
CodeSandbox:
https://codesandbox.io/s/zxlzzv05n3
- ClockRow.js is surplus
- Clock.js is not changed
App.js is changed, and "React styled":
import React, { Component } from "react";
import Clock from "./Clock";
class App extends Component {
constructor(props) {
super(props);
this.state = { items: , inputTle: "Teszt", inputIval: 200 };
}
handleChangeTitle = event => {
this.setState({ inputTle: event.target.value });
};
handleChangeInterval = event => {
this.setState({ inputIval: event.target.value });
};
handleSubmit = event => {
console.log(this.state);
if (this.state.inputTle.length > 0 && this.state.inputIval > 9) {
this.setState(prevState => {
return {
items: [
...prevState.items,
{
title: this.state.inputTle,
interval: this.state.inputIval
}
]
};
});
}
event.preventDefault();
};
render() {
return (
<div>
<div className="row">
<h1 className="col text-center">Hello, React!</h1>
</div>
<div className="row">
<form onSubmit={this.handleSubmit}>
<label>
Title:{" "}
<input
type="text"
name="tle"
value={this.state.inputTle}
onChange={this.handleChangeTitle}
/>
</label>
<label>
Interval:{" "}
<input
type="number"
name="ival"
value={this.state.inputIval}
onChange={this.handleChangeInterval}
/>
</label>
<input type="submit" value="Add" />
</form>
</div>
<div className="row">
{this.state.items.map((item, index) => (
<div className="col" key={index}>
<Clock {...item} />
</div>
))}
</div>
</div>
);
}
}
export default App;
answered Nov 11 at 22:02
Boris Traljić
464310
answered Nov 11 at 22:02
Boris Traljić
464310
answered Nov 11 at 22:02
Boris Traljić
464310
answered Nov 11 at 22:02
Boris Traljić
464310
464310
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Put regular data in your component state and derive the JSX from that data in the render method. You generally don't want to store
React.createElementresults in your state. If you take props and add it to your state, the state will not update when the props update. It's therefore a good idea to just use the props directly if you can, and the component will keep itself updated automatically.– Tholle
Nov 11 at 20:19