React-section NPM

react-section

npm -i react-section

Marking dom element mostly use for getting element position and offsets, scroll to element or implement lazy loading

All functions and props

 componentDidMount() {
    console.log(this.section);
    this.section.getFlagsOffSet()
    this.section.getFlagsPosition()
    this.section.flagsNode
    this.section.flagsRef
    this.section.inViewFlag
    this.section.scrollToFlag()
}

Scroll to section

class App extends Component {
  constructor(props) {
    super(props);
    this.section = React.createRef();
  }

  onClick = flag => {
    this.section.scrollToFlag(flag);
  };
  render() {
    return (
      <Section onRef={ref => (this.section = ref)}>
        <button onClick={() => this.onClick("header")}>Go to header</button>
        <button onClick={() => this.onClick("body")}>Go to body</button>
        <Section.Flag
          style={{ height: "30vh", marginTop: "60px" }}
          flagName="header"
        >
          <h1>Header</h1>
        </Section.Flag>
        <Section.Flag className="body" flagName="body">
          <h1>Body</h1>
        </Section.Flag>
      </Section>
    );
  }
}

scrollToFlag = (flagName, top = 0, duration = 500) => {..}

flagName: Name of marking flag is required
top: Offset from top default is 0
duration: Duration default is 500

Lazyload

<Section onRef={ref => (this.section = ref)}>
  <!-- Flag will not accept children is lazyLoad props is provided -->
  <Section.Flag
    lazyLoad={{
      // Loaded delay time
      delay: 2000,
      // initProps apply to Flag not the loading component
      initProps: {
        className: "beforeload",
        style: {
          backgroundColor: "green"
        }
      },
      // Props component will receivie after it is loaded
      loadedProps: { onClick: () => alert("Hi i'm lazy 1") }
      loading: () => <h1>I will load after 2s</h1>,
      loaded: () => import("./component/Loaded"),
  }}
    flagName="lazyheader"
    className="component__lazy"
  />
  <Section.Flag
    lazyLoad={{
      // Again these props apply to the Flag not the component
      // and will be remove after component is loaded
      initProps: {
        className: "beforeload",
        style: {
          backgroundColor: "green"
        }
      },
      // Component will be loaded when appear in to viewport
      loadOnView: true,
      // Component will be loaded when scroll down 200px from it
      fromBottom: 200,
      loadedProps: {
          onClick: () => alert("Hi i'm lazy 2")
      }
      loading: () => <h1>Scroll down 200px from me to load</h1>,
      loaded: () => import("./component/Loaded2"),
    }}
    flagName="lazyheader2"
    className="component__lazy"
  />
</Section>