What methods are available for implementing conditional rendering in a React-based Single Page Application (SPA)?

Question

What methods are available for implementing conditional rendering in a React-based Single Page Application (SPA)?

I am in the process of creating my own personal website using ReactJS. I want to ensure that my website, being a Single Page Application, is rendered conditionally. Essentially, I envision the Rendering to display each section on my page at different intervals as users scroll down to view various sections. This way, I aim to have my components animated only when they are in view, rather than having all animations load at once from the start.

        <Section styles='me' id={'top'}>
        <img className="background-image" src={require('../img/Sydney.jpg')} />
        <Animated animationIn="zoomIn" animationOut="zoomOut" isVisible={true}>
        <div><Avatar src={require('../img/me.jpg')} size={200} round={true} /></div>
        </Animated>
        <h1>Jack Lau</h1>
        <h3>Web/Mobile Apps Developer</h3>
        <h3 style={{ maxWidth: 480 }}>Core Skills:<br/>Ready for React, Redux, Typescript, ES6, JSX, Babel and Webpack. Objective-C, Android Development, C#, JavaScript, PHP, Database Design</h3>
        <div style={{ marginBottom: '30px' }}>
            <a href='https://www.linkedin.com/in/jacklau9515/' className='btn-icon' target='_blank'><i className='fa fa-linkedin-square'></i></a>
            <a href='https://github.com/Jacklau9515' className='btn-icon' target='_blank'><i className='fa fa-github-square'></i></a>
            <a href='https://plus.google.com/u/0/100888601415107489035' className='btn-icon' target='_blank'><i className='fa fa-google-plus-square'></i></a>
        </div>
        <Animated animationIn="rubberBand" animationOut="zoomOut" isVisible={true}>
        <a href='#hire-me' className='btn'>Hire Me!</a>
        </Animated>
        </Section>

        <Section styles='resume'>
        <div id={'background'}>
        <img className="background-image" src={require('../img/xpic11075_sc115.com.jpg')} />
        <h3 className='title'>My Personal Introduction</h3>
        <Animated animationIn="fadeInLeft" animationOut="rollOut" animationInDelay="3" isVisible={true}>
        <p>I graduated from <a href="http://www.utas.edu.au/" target="_blank"><u>University of Tasmania (UTAS)</u></a> in December 2017 with an undergraduate degree (Bachelor of Information and Communication Technology, Software Development). Participate in the implementation of <a href="https://itunes.apple.com/us/app/dbdc/id1296090690?mt=8" target="_blank"><u>Digitized Bike Data</u></a> Project and served as Leader Software Developer of the team.</p>
        <p>I am very detail oriented. You can easily contact me at any hour of the day, and I am enthusiastic and passionate about architectural and design patterns, best practices and cutting-edge technologies.</p>
        <p>During my three years of university study, no less than a Distinction (DN) Grade of All my programming-related subjects, especially web programming. The following table shows the scores and descriptions of all my programming subjects:</p>
       </Animated></Section>

Please note: the Animated component in use here is specifically designed for showing or hiding elements with animated effects utilizing Animated.css.

css reactjs animation

Answer 1

Answer №1

One possible strategy to consider:

As you construct your Component, create an internal State to monitor the Browser's Scroll Position and update it using an event handler. Once this position hits the desired point for your component to animate, switch a boolean within the state.

In the Render Method, utilize

{{Expression/Variable/Const Evaluating to True} && <Component>}

to conditionally render the component only when certain criteria are met.

Below is some example code. The performance with React/Re-Renders may vary, and there is no guarantee that this code will function perfectly - it serves as guidance on potential approaches and logic you could implement.

The ability to selectively render components based on custom logic through JSX is a valuable technique to explore.

class AnimatedContainer extends Component {
    constructor(props) {
     super(props)

     this.state = {
      renderComponent1: false,
      scrollPosition: "0"
     }

     this.handleScroll = this.handleScroll.bind(this)
    }

    handleScroll(scrollPosition) {
     this.setState({
      scrollPosition: document.documentElement.scrollTop
     })
       if (scrollPosition > 300) { 
        this.setState({ renderComponent1: true })
      }
    }

    componentDidMount() {
     window.onscroll = () => this.handleScroll(this.state.scrollPosition)
    }

    componentDidUpdate() {
     window.onscroll = () => this.handleScroll(this.state.scrollPosition)
    }

    render() { 
     return(
       <div>
        {renderComponent1 && <AnimatedComponent1>}
       </div>
     )}
}

A suggested improvement involves utilizing addEventListener:

windowScroll = () => this.handleScroll(this.state.scrollPosition)

componentDidMount() {
  window.addEventListener('scroll', this.windowScroll)
}

componentWillUnmount() {
  window.removeEventListener('scroll', this.windowScroll)
}

Edit: You will need to implement your animation logic separately - assuming your Animated Components will have their own methods for this purpose.

Answer 2

One possible strategy to consider:

As you construct your Component, create an internal State to monitor the Browser's Scroll Position and update it using an event handler. Once this position hits the desired point for your component to animate, switch a boolean within the state.

In the Render Method, utilize

{{Expression/Variable/Const Evaluating to True} && <Component>}

to conditionally render the component only when certain criteria are met.

Below is some example code. The performance with React/Re-Renders may vary, and there is no guarantee that this code will function perfectly - it serves as guidance on potential approaches and logic you could implement.

The ability to selectively render components based on custom logic through JSX is a valuable technique to explore.

class AnimatedContainer extends Component {
    constructor(props) {
     super(props)

     this.state = {
      renderComponent1: false,
      scrollPosition: "0"
     }

     this.handleScroll = this.handleScroll.bind(this)
    }

    handleScroll(scrollPosition) {
     this.setState({
      scrollPosition: document.documentElement.scrollTop
     })
       if (scrollPosition > 300) { 
        this.setState({ renderComponent1: true })
      }
    }

    componentDidMount() {
     window.onscroll = () => this.handleScroll(this.state.scrollPosition)
    }

    componentDidUpdate() {
     window.onscroll = () => this.handleScroll(this.state.scrollPosition)
    }

    render() { 
     return(
       <div>
        {renderComponent1 && <AnimatedComponent1>}
       </div>
     )}
}

A suggested improvement involves utilizing addEventListener:

windowScroll = () => this.handleScroll(this.state.scrollPosition)

componentDidMount() {
  window.addEventListener('scroll', this.windowScroll)
}

componentWillUnmount() {
  window.removeEventListener('scroll', this.windowScroll)
}

Edit: You will need to implement your animation logic separately - assuming your Animated Components will have their own methods for this purpose.

What methods are available for implementing conditional rendering in a React-based Single Page Application (SPA)?

Answer №1

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