Value not updating inside a ReactJS function - reactjs

Question

I have a ReactJs function that displays a simple dialogue box, and is intended to update a value for the parent component. The function looks like this:
export function MyDialogue(props: IMyProps) {
var myValue = 0;
return (
<div style={style}>
<label>Enter a number here: </label>
<input type="text" value={myValue} />
<button onClick={() => props.updateFunc(myValue)}>Update</button>
</div>
);
}
I've tried several variations of this; for example, passing in props.myValue, and even changing the function to a class and passing this.state.myValue in. In all but this example, myValue remains as it was in the parent class, and in this version, always 0.
updateFunc simply calls setState on the parent class, and having traced through it, it never gets called with the changed value.
I've seen some documentation that says to essentially handle the onChange event - is this the only way to make this work, or is there a way to implement data binding in React?

Answer 1

Just bind back your input to the parent's state via props.value;
MyDialogue.js
export function MyDialogue(props: IMyProps) {
return (
<div style={style}>
...
<input type="text" value={props.value} />
...
</div>
);
}
Parent.js
....
render(){
const { dialogueValue } = this.state;
return <MyDialuge value={dialogueValue} updateFunc={this.handleUpdate} />
}

Answer 2

You are using uncontrolled input because You are not keeping value of input inside state.
Solution is
With uncontrolled:
export class MyDialogue extends React.Component<IMyProps, {}>{
constructor() {
super();
this.input = React.createRef();
}
return (
<div style={style}>
<label>Enter a number here: </label>
<input type="text" ref={this.input} />
<button onClick={() => props.updateFunc(this.input.current.value)}>Update</button>
</div>
);
}
With controlled:
Maintain myValue state in parent and pass it to child.
and on change on input event call a function of parent which change myValue using setState,
Maintain myValye state inside MyDialogue and onClick pass it to parent.

Answer 3

You need to change this component to a stateful component
then do a two-way binding for your textbox and have it talk to local state and then use that state value to update parent component.
export class MyDialogue extends React.Component<IMyProps, {}>{
constructor() {
super();
this.state = {
myValue: 0
}
}
onChangeHandler = (event:any) =>{
this.setState({myValue:event.target.value});
}
return (
<div style={style}>
<label>Enter a number here: </label>
<input type="text" value={this.state.myValue} onChange={this.onChangeHandler}/>
<button onClick={() => props.updateFunc(this.state.myValue)}>Update</button>
</div>
);
}