Stopwatch on Scoreboard does not work. no time elapses. In the video you test it, and it works just fine.

please post your code. I remember doing this course and had trouble at first getting the clock to update. It should work though. If you post your code we can try and troubleshoot.

Hi Zack, thanks for commenting back. ill paste the whole component, i havent been able to find any errors but maybe you can spot it!

import React, { Component, PropTypes } from 'react';

export default class Stopwatch extends Component { state = { running: false, previouseTime: 0, elapsedTime: 0, };

componentDidMount() { this.interval = setInterval(this.onTick); }

componentWillUnmount() { clearInterval(this.interval); }

onStart = () => { this.setState({ running: true, previousTime: Date.now(), }); };

onStop = () => { this.setState({ running: false, }); };

onReset = () => { this.setState({ elapsedTime: 0, previousTime: Date.now(), }); };

onTick = () => { if (this.state.running) { var now = Date.now(); this.setState({ elapsedTime: this.state.elapsedTime + (now - this.state.previousTime), previousTime: Date.now(), }); } };

render() { var seconds = Math.floor(this.state.elapsedTime / 100); return ( <div className="stopwatch" > <h2>Stopwatch</h2> <div className="stopwatch-time"> {seconds} </div> { this.state.running ? <button onClick={this.onStop}>Stop</button> : <button onClick={this.onStart}>Start</button> } <button onClick={this.onReset}>Reset</button> </div> ) };

}