React

by Jim_Kelleher

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 LevelTop extends React.Component {
  constructor(props) {
    super(props)
    this.state = { }
    
    this.levelTopFunction = this.levelTopFunction.bind(this);        
  }
  
  levelTopFunction() {
  	alert("levelTopFunction");
  }
  
  render() {  
  	return ( 
    	<div>
    	  LevelTop     
        <LevelMiddle levelTopFunction={this.levelTopFunction}></LevelMiddle>
      </div>
    )
  }
}

class LevelMiddle extends React.Component {
  constructor(props) {
    super(props)
    this.state = { }    
  }
  
  levelMiddleFunction() {
  	alert("levelMiddleFunction");
  }
  
  render() {  
  	return (  
    	<div>           
    	  LevelMiddle        
        <button onClick={this.props.levelTopFunction}>Press for Parent</button>
        
        <LevelBottom levelMiddleFunction={this.levelMiddleFunction}></LevelBottom>
      </div>
    )
  }
}

class LevelBottom extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
    }
    
    //this.levelBottomFunction = this.levelBottomFunction.bind(this);
    
  }
  
  levelBottomFunction() {
  	alert("levelBottomFunction");
  }
  
  render() {  
  	return (  
    	<div>
        LevelBottom
        <button onClick={this.props.levelMiddleFunction}>Press for Parent</button>
      </div>    	
    )
  }
}

class HierarchyPassApp extends React.Component {
  constructor(props) {
    super(props)
	}
  
  render() {
    return (
      <div>      
        <LevelTop></LevelTop> 
      </div>
    )
  }
}

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