Child Parent communication

Example for medium article

by nabendu

HTML

<div id="app"></div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

.done {
  color: rgba(0, 0, 0, 0.3);
  text-decoration: line-through;
}

input {
  margin-right: 5px;
}

React

class App extends React.Component {
onSearchSubmit(term) {
	console.log(term);
}

render() {
	return (
  	<div>
  	  <h2>Child Parent communication Demo:</h2> 
      <SearchComponent userSubmit={this.onSearchSubmit} />
  	</div>
  )
}
}

class SearchComponent extends React.Component {
	state = {val: ''};
  
  onInputChange = (event) => {
  	this.setState({ val: event.target.value })
  }
  
  onFormSubmit = (event) => {
    event.preventDefault(); 
    this.props.userSubmit(this.state.val);
  }
  
  render() {
    return (
      <div>               
          <label>Search Box </label>
          <form onSubmit={this.onFormSubmit}>
             <input type="text" 
                value={this.state.val}
                onChange={this.onInputChange} 
              />                 
          </form>         
      </div>
    )
  }
}

ReactDOM.render(<App />, document.querySelector("#app"))