React

by Muthuraman B

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 TodoApp extends React.Component {
  constructor(props) {
    super(props)

  }
  onChangeCheckBox(event) {
  
    if(event.target.checked) {
      this.actionButtonRef.disabled = "";

    }
    else {
      this.actionButtonRef.disabled = "disabled";
    }
  }  
  render() {
    return (
      <div>
        <input 
          type="checkbox" 
          ref={element => {
            this.checkboxAllRef = element;
          }}
          onChange={event => this.onChangeCheckBox(event)}/> Checbox 1
          <button
          type="button"
          className="btn btn-danger" 
          ref={element => {
            this.actionButtonRef = element;
          }}
          onClick={event => {
            alert("clicked");
          }} 
          disabled="disabled">Button</button>
          <br />
          <input 
          type="checkbox" 
          ref={element => {
            this.checkboxAllRef = element;
          }}
          onChange={event => this.onChangeCheckBox(event)}/> Checbox 2
          <button
          type="button"
          className="btn btn-danger" 
          ref={element => {
            this.actionButtonRef = element;
          }}
          onClick={event => {
            alert("clicked");
          }} 
          disabled="disabled">Button</button>
        <br />
        <input 
          type="checkbox" 
          ref={element => {
            this.checkboxAllRef = element;
          }}
          onChange={event => this.onChangeCheckBox(event)}/> Checbox 3
          <button
          type="button"
          className="btn btn-danger" 
          ref={element => {
            this.actionButtonRef = element;
          }}
          onClick={event => {
            alert("clicked");
          }} 
          disabled="disabled">Button</button>
        <br />
        
          
          
      </div>
    )
  }
}

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