react-virtualized-auto-sizer

What is react-virtualized-auto-sizer?

The react-virtualized-auto-sizer package is a utility component for React that automatically adjusts the size of its child component to fit the available space. It is commonly used in conjunction with other virtualization libraries to create performant, scrollable lists or grids that can handle large datasets efficiently.

What are react-virtualized-auto-sizer's main functionalities?

Auto-sizing a child component

This feature allows you to automatically adjust the size of a List component from the react-virtualized library to fit the available space. The AutoSizer component wraps around the List and provides the height and width as props.

```jsx
import React from 'react';
import AutoSizer from 'react-virtualized-auto-sizer';
import { List } from 'react-virtualized';

const MyList = ({ items }) => (
  <AutoSizer>
    {({ height, width }) => (
      <List
        height={height}
        width={width}
        rowCount={items.length}
        rowHeight={20}
        rowRenderer={({ index, key, style }) => (
          <div key={key} style={style}>
            {items[index]}
          </div>
        )}
      />
    )}
  </AutoSizer>
);

export default MyList;
```

Other packages similar to react-virtualized-auto-sizer

react-window

react-window is a lightweight library for rendering large lists and tabular data. It is similar to react-virtualized but focuses on providing a smaller and faster implementation. Unlike react-virtualized-auto-sizer, react-window does not include an auto-sizing component out of the box, but it can be used with react-virtualized-auto-sizer for similar functionality.

react-virtual

react-virtual is a hook-based library for efficiently rendering large lists and grids. It is highly customizable and offers a modern API. While it does not include an auto-sizing component, it can be combined with other libraries like react-virtualized-auto-sizer to achieve similar results.

README

react-virtualized-auto-sizer

Standalone version of the AutoSizer component from react-virtualized.

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Install

npm install --save react-virtualized-auto-sizer

Documentation

Property	Type	Required?	Description
children	Function	✓	Function responsible for rendering children. This function should implement the following signature: ({ height: number, width: number }) => PropTypes.element
className	String		Optional custom CSS class name to attach to root AutoSizer element. This is an advanced property and is not typically necessary.
defaultHeight	Number		Height passed to child for initial render; useful for server-side rendering. This value will be overridden with an accurate height after mounting.
defaultWidth	Number		Width passed to child for initial render; useful for server-side rendering. This value will be overridden with an accurate width after mounting.
disableHeight	Boolean		Fixed height; if specified, the child's height property will not be managed
disableWidth	Boolean		Fixed width; if specified, the child's width property will not be managed
nonce	String		Nonce of the inlined stylesheets for Content Security Policy
onResize	Function		Callback to be invoked on-resize; it is passed the following named parameters: ({ height: number, width: number }).
style	Object		Optional custom inline style to attach to root AutoSizer element. This is an advanced property and is not typically necessary.
tagName	string		Optional HTML tag name for root element; defaults to "div"

Examples

Some components (like those found in react-window or react-window) require numeric width and height parameters. The AutoSizer component can be useful if you want to pass percentage based dimensions.

import AutoSizer from "react-virtualized-auto-sizer";

// UI
<AutoSizer>
  {({ height, width }) => {
    // Use these actual sizes to calculate your percentage based sizes
  }}
</AutoSizer>;

FAQs

Can I use this component with flexbox?

Flex containers don't prevent their children from growing and AutoSizer greedily grows to fill as much space as possible. Combining the two can be problematic. The simple way to fix this is to nest AutoSizer inside of a block element (like a <div>) rather than putting it as a direct child of the flex container, like so:

<div style={{ display: 'flex' }}>
  <!-- Other children... -->
  <div style={{ flex: '1 1 auto' }}>
    <AutoSizer>
      {({ height, width }) => (
        <Component
          width={width}
          height={height}
          {...props}
        />
      )}
    </AutoSizer>
  </div>
</div>

Why is AutoSizer passing a height of 0?

AutoSizer expands to fill its parent but it will not stretch the parent. This is done to prevent problems with flexbox layouts. If AutoSizer is reporting a height (or width) of 0- then it's likely that the parent element (or one of its parents) has a height of 0.

The solution to this problem is often to add height: 100% or flex: 1 to the parent. One easy way to test this is to add a style property (eg background-color: red;) to the parent to visually confirm that it is the expected size.

Can I use AutoSizer to manage only width or height (not both)?

You can use AutoSizer to control only one dimension of its child component using the disableHeight or disableWidth attributes. For example, a fixed-height component that should grow to fill the available width can be created like so:

<AutoSizer disableHeight>
  {({width}) => <Component height={200} width={width} {...props} />}
</AutoSizer>

Module parsing fails because of an unexpected token?

This package targets ECMAScript 2015 (ES6) and requires a build tool such as babel-loader that is capable of parsing the ES6 class syntax.

Can this component work with a Content Security Policy?

The specification of Content Security Policy describes as the following:

This document defines Content Security Policy, a mechanism web applications can use to mitigate a broad class of content injection vulnerabilities, such as cross-site scripting (XSS).

To apply Content Security Policy, pass a nonce to AutoSizer and add a matching nonce-source to the Content-Security-Policy field in HTTP header.