React horizontal scrolling menu

This is horizontal scrolling menu component for React. Menu component has adaptive width, just set width for parent container. Items width will be determinated from css styles.

Note: Don't have much time for support project. Any help apprecciated.

For navigation you can use arrows, mouse wheel or just drag items.

Component return items position, selected item and click event from callbacks.

Possible set default position and selected item on initialization.

Add star if you like project :)

Quick start

npm install --save react-horizontal-scrolling-menu

In project:

import React, { Component } from 'react';
import ScrollMenu from 'react-horizontal-scrolling-menu';
import './App.css';

// list of items
const list = [
  { name: 'item1' },
  { name: 'item2' },
  { name: 'item3' },
  { name: 'item4' },
  { name: 'item5' },
  { name: 'item6' },
  { name: 'item7' },
  { name: 'item8' },
  { name: 'item9' }
];

// One item component
// selected prop will be passed
const MenuItem = ({text, selected}) => {
  return <div
    className={`menu-item ${selected ? 'active' : ''}`}
    >{text}</div>;
};

// All items component
// Important! add unique key
export const Menu = (list, selected) =>
  list.map(el => {
    const {name} = el;

    return <MenuItem text={name} key={name} selected={selected} />;
  });


const Arrow = ({ text, className }) => {
  return (
    <div
      className={className}
    >{text}</div>
  );
};


const ArrowLeft = Arrow({ text: '<', className: 'arrow-prev' });
const ArrowRight = Arrow({ text: '>', className: 'arrow-next' });

const selected = 'item1';

class App extends Component {
  constructor(props) {
    super(props);
    // call it again if items count changes
    this.menuItems = Menu(list, selected);
  }

  state = {
    selected
  };

  onSelect = key => {
    this.setState({ selected: key });
  }


  render() {
    const { selected } = this.state;
    // Create menu from items
    const menu = this.menuItems;

    return (
      <div className="App">
        <ScrollMenu
          data={menu}
          arrowLeft={ArrowLeft}
          arrowRight={ArrowRight}
          selected={selected}
          onSelect={this.onSelect}
        />
      </div>
    );
  }
}

In App.css

.menu-item {
  padding: 0 40px;
  margin: 5px 10px;
  user-select: none;
  cursor: pointer;
  border: none;
}
.menu-item-wrapper.active {
  border: 1px blue solid;
}
.menu-item.active {
  border: 1px green solid;
}

.scroll-menu-arrow {
  padding: 20px;
  cursor: pointer;
}

Example

You can clone repository and run demo project from examples folder.

git clone https://github.com/asmyshlyaev177/react-horizontal-scrolling-menu
cd react-horizontal-scrolling-menu/examples
npm install
npm run start

Properties and callbacks

Props	Type	Description	Required	Default Value
alignCenter	Boolean	Try to align items by center	false	true
alignOnResize	Boolean	Try to align items after resize window	false	true
clickWhenDrag	Boolean	After drag end select item under cursor( if any)	false	false
dragging	Boolean	Allow drag items by mouse(and touch)	false	true
wheel	Boolean	Scroll with mouse wheel	false	true
arrowLeft	React component	React component for left arrow	false	null
data	Array of react components	Menu items, if empy render null (note, component must have unique key!)	true	[]
hideArrows	Boolean	hide arrows if items fit to one screen, (add class scroll-menu-arrow--disabled to arrows)	false	false
arrowDisabledClass	String	The class name to append when arrows are disabled	false	"scroll-menu-arrow--disabled"
hideSingleArrow	Boolean	hide left/right arrows on first/last pages	false	false
transition	Float number	How long animation last, 0 for disable	false	0.4
selected	String or Number	Initial selected item	false	0
translate	Number	Initial offset	false	0
dragging	Boolean	Allow drag items by mouse(and touch)	false	true
clickWhenDrag	Boolean	After drag end select item under cursor( if any)	false	false
menuClass	String	Class for component	false	'horizontal-menu'
arrowClass	String	Class for arrow	false	'scroll-menu-arrow'
wrapperClass	String	Class for wrapper in component	false	'menu-wrapper'
innerWrapperStyle	Object	Styles inner wrapper	false	{whiteSpace: 'nowrap', textAlign: 'left', userSelect: 'none'}
innerWrapperClass	String	Class for inner wrapper	false	'menu-wrapper--inner'
itemStyle	Object	Styles for item wrapper	false	{display: 'inline-block'}
itemClass	String	Class for item wrapper	false	'menu-item-wrapper'
itemClassActive	String	Class for active item wrapper	false	'active'
menuStyle	Object	Styles for root menu component	false	{display: 'flex', alignItems: 'center', userSelect: 'none'}
wrapperStyle	Object	Style for outer wrapper	false	{overflow: 'hidden', userSelect: 'none'}
onSelect	Function	Callback when item selected, return item key	false	null
onUpdate	Function	Callback when menu position changed, return { translate: 0 }	false	null
scrollToSelected	Boolean	Scroll to `selected` props passed on mount and when props changed	false	false
scrollBy	Number	How many menu items to scroll, 0 for all visible	false	0
inertiaScrolling	Boolean	Use inertia for scrolling, duration depends on transition and slowdown	false	false
inertiaScrollingSlowdown	Float Number	Slow down factor for inertia scrolling	false	0.25
useButtonRole	Boolean	Adding role="button" to every item	false	true
rtl	Boolean	Reverse the scroll direction (component should have a parent with dir="rtl" in the DOM tree	false	false

Programmaticaly change things

You can scroll left/right via componentRef.handleArrowClick() and componentRef.handleArrowClickRight() functions.

Can get other properties in component state - const { leftArrowVisible, rightArrowVisible, selected, translate } = componentRef.state

Can simulate click with componentRef.onItemClick('item4')

Can select and scroll to item with componentRef.scrollTo('item14')

Gotchas

Menu items must have width, if items contains images and images don't loaded yeat it can be problem. Generally component will try to determine width of items, if it can't you can assign ref to component and call $ref.setInitial() manually when items have width for sure.
Browser must support requestAnimationFrame or use polyfill.
It can doesn't work in IE, and I don't care, I am not a necrophile.(if you need it you can make PR, I will merge)