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Loading data form external api automatically and using some event such as on a button click in reactjs

beginner level- just creating a simple example how to load data from a external api using typescript and reactjs.

running code: link https://stackblitz.com/edit/react-ts-ek3vme

code:-

//calling data from external api
//calling data on event

import React, { Component } from 'react';
import { render } from 'react-dom';
import './style.css';

interface AppProps {

}
//user data interface
interface userData
{
key:string;
body:string;
title:string;
userId:number;
id:number;
}//urldata interface
interface urlData
{
origin:string;
url:string;
}
//app state interface
interface AppState {
name: string;
data:urlData
userdata:Array<userData>;
}
//app code
class App extends Component< AppProps,AppState> {
listName:string="click on button to load list"
load:Function=null;
constructor(props) {
super(props);
this.state = {
name: "loading.....",
data:{
origin:null,
url:null,
},
userdata:new Array<userData>()

};
}
//componentDidMount called immediately after component rendered first time
componentDidMount() {

fetch("https://httpbin.org/get")
.then(res => res.json())
.then(
(result) => {
var data:urlData={
origin:null,
url:null
};
data.origin=result.origin;
data.url=result.url;
this.setState({
name: "auto load data from rest api",
data:data
});
},
(error) => {
console.log(error);
}
)
}
//load data from external url
loadData(url:string)
{
fetch(url)
.then(res => res.json())
.then(
(result) => {
result.map((object, i)=>{
var mydata:userData=
{
key:object.id,
body:object.body,
title:object.title,
userId:object.userId,
id:object.id
}
this.state.userdata.push(mydata);
}
)

this.setState({
name: "load data on button click",
userdata:this.state.userdata
});
},

(error) => {
}
)

}
render() {
return (
<div>
<p>{this.state.name}</p>
<p>{this.state.data.url}</p>
<p>{this.state.data.origin}</p>
<button onClick={this.load=()=>{
//pass api url
this.loadData("https://jsonplaceholder.typicode.com/posts");
}}>Load data from external sources</button>
<p>{this.listName}</p>
<ul>
{this.state.userdata.map(data => (
<li key={data.key}>
<b>Heading:=> {data.title}</b><br></br>
<b>all Data:=></b>{data.body}
</li>
))}
</ul>
</div>
);
}
}

render(<App />, document.getElementById('root'));

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