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Hello Community - my second post as I'm very stuck trying to integrate a range-slider in React that will be friends with the progress() method to move through the timeline! I can pass around the value I need to my slider, but getting undefined errors when I try to pass this over to this.tl.progress(this.state.value) etc? I've read through several posts, but none look very current...in fact most are going back 2-3 years and the react-way has changed! Looking through the 'getting started with react post from Rodrigo' there are some useful hints, but it seems overly complex, compared to how easy it was to plugin the play, pause, reverse and restart methods into a button with an onClick event handler. Do we really need a separate state management file to pass down the state as props to a child component just to get the slider to move through the timeline without breaking? I also got some very good support already (This gives you more of an idea what I am working on...sorry for the lack of a reduced codepen example as this is a large full-stack application! coming soon I promise!) Here's some code of how I got the play, pause, reverse, and restart methods working...these plugged right in! (FYI ButtonGroup and Button components are from React-Bootstrap): <Row> <Col md={12}> <ButtonGroup className="animationControls"> <Button bsStyle="primary" onClick={() => this.tl.play()}> <Glyphicon glyph="play" /> {"Play"} </Button> <Button bsStyle="primary" onClick={() => this.tl.pause()}> <Glyphicon glyph="pause" /> {"Pause"} </Button> <Button bsStyle="primary" onClick={() => this.tl.reverse()}> <Glyphicon glyph="backward" /> {" Reverse"} </Button> <Button bsStyle="primary" onClick={() => this.tl.restart()}> <Glyphicon glyph="step-backward" /> {"Restart"} </Button> </ButtonGroup> </Col> </Row> Until bootstrap-4 is up and running with react, you do not have range slider in your form components, so I had to look elsewhere. After trying a few different versions, the npm package rc-slider seems to be the most lightweight (little to no boilerplate required!) create your styles for the slider before your class function: const railStyle = { position: "relative", width: "90%", margin: "0% 0% 0% 3%", height: 10, borderRadius: 7, cursor: "pointer", backgroundColor: "#afafaf" }; const handleStyle = { height: 15, width: 15, backgroundColor: "white", borderTopLeftRadius: 10, borderTopRightRadius: 10, border: "3px solid #E5F1FC", top: -2, position: "absolute" }; AND be sure to set your starting value in the constructor....probably 0 since that would be the start of your timeline.... constructor(props) { super(props); this.tl = new TimelineMax(); this.state = { center: [46.8, 8.3], zoom: 1, value: 0 }; this.handleZoomIn = this.handleZoomIn.bind(this); this.handleZoomOut = this.handleZoomOut.bind(this); this.handleReset = this.handleReset.bind(this); this.handleSliderChange = this.handleSliderChange.bind(this); } Next, I have two functions...please note that onSliderChange and onAfterChange are pre-built methods for the react rc-slider component. these successfuly track and log the value as you drag along the timeline, but kill the animation! onSliderChange = value => { this.setState({ value }); console.log("Value is: ", value); }; onAfterChange = value => { console.log(value); this.tl.progress(value / 100); }; .....And lastly, the slider component itself, inside render() <Slider className="slider" style={railStyle} handleStyle={handleStyle} min={0} max={bookingData.length} value={this.state.value} onChange={this.onSliderChange} //onInput={this.handleSliderChange} onAfterChange={this.onAfterChange} /> I know this may be hard to digest without a working example. I'll try to make a reduced case, but here's the issue...inside the Slider component, if you drag the slider around, it will successfully log the value I need. Where can I pass the value to this.tl.progress(this.state.value / 100) etc to get the timeline to respond? I've tried a dozen different ways, and I either get that value is undefined, or when I try to pass this in to the onSliderChange I get my fav error about expected a function, but instead saw an expression, no unused expressions. dragging the slider around kills the timeline, or depending where I do it, will make the animated elements disappear from the screen. Grrrrr! React is very powerful, but the need to constantly update the state of components during their lifecycle make these kinds of things very frustrating! If anyone has solved this or can send a link to an example of how to do this it would be greatly appreciated! If I figure it out on my own I will update the post - I know I'm close! Thanks community!