Add component on button click - reactjs

Question

I am making a front end application using typescript and react. I have a component A which amongst other html elements has a textbox. I want to add this component A on click of a button. So if the user clicks the button multiple times, i want a new component A to be created on every click. Also I want to be able to store the text data so that I can later fetch it and process it.
I tried to make a list of this component but it gives me an error.
interface State {
componentList?: ComponentA[];
}
export class ComponentList extends React.Component<Props, State> {
  constructor(props) {
    super(props);
    this.onClick = this.onClick.bind(this);
  }
public onClick(event) {
const componentList = this.state.componentList;
this.setState({
componentList: componentList.concat(<ComponentA key=
{componentList.length} />)
});
}
  public render() {
    return (
      <React.Fragment>
        <button onClick={this.onClick}>Add component</button>
{this.state.componentList.map(function(component, index)
{
return ComponentA
})}
      </React.Fragment>
    );
  }
}

Answer 1

You might want to make two changes in your code.
First initialise your state in the constructor,
constructor(props) {
super(props);
this.onClick = this.onClick.bind(this);
this.state = { componentList: [] }
}
So that react can track that data.
Second thing is, you are returning wrong item from the map in the render function.
Try returning component, which is different copies of <ComponentA ../> that you pushed every time you clicked the button,
public render() {
return (
<React.Fragment>
<button onClick={this.onClick}>Add component</button>
{this.state.componentList.map(function(component, index)
{
return component;
})}
</React.Fragment>
);
}

Answer 2

Keep the component count in the state:
constructor(props) {
super(props);
this.onClick = this.onClick.bind(this);
this.state = {
numComponents: 0
}
}
Add a new function which creates an array of the component for rendering later:
clickedComponents = () => {
let componentArray = [];
for (let i=0; i<this.state.numComponents; i++) {
componentArrays.push(<ComponentA />);
}
return componentArray;
}
Increment the component count with your onClick function:
public onClick(event) {
this.setState({numComponents: this.state.numComponents + 1});
}
Render the component array:
public render() {
return (
<React.Fragment>
<button onClick={this.onClick}>Add component</button>
{this.clickedComponents()}
</React.Fragment>
);
}