# regridder
Simple React js responsive grid layout system.
## Contents
- [Overview](#overview)
- [Compatibility](#compatibility)
- [Installation](#installation)
- [API Reference](#api-reference)
- [Examples](#examples)
- [Further Notes](#further-notes)
## Overview
Regridder allows developers to easily (and [simply](https://www.infoq.com/presentations/Simple-Made-Easy)) create flexible and responsive grid layouts within their React js applications. Regridder makes use of the excellent [CSS Grid Layout](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Grid_Layout) feature, and uses the same syntaxes for prop values.
Regridder uses the incredible [styled-components](https://github.com/styled-components/styled-components) package to apply the styles required for the grid and grid items, including applying media queries for responsiveness. If you aren't using it yet, give it a look to see if it could help improve your styling experience.
## Compatibility
All major browsers, except for Internet Explorer.
https://caniuse.com/#feat=css-grid
## Installation
#### npm
`npm i regridder`
#### yarn
`yarn add regridder`
### Install dependencies
Don't forget to install `styled-components` as well if you're not already using it. The installation of this package is separated so that we can reduce the size of `regridder` significantly if you happen to be using `styled-components` already.
#### npm
`npm i styled-components`
#### yarn
`yarn add styled-components`
Refer to the docs for your version of npm or yarn if you encounter issues installing this package.
## API Reference
Be sure to check out the [CSS Grid Layout Documentation](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Grid_Layout) for various prop syntaxes – in general, camelCased component props should map to a dash-cased css property within that documentation (though not all component props have a css property equivalent).
### `Grid` props
Note that all `Grid` props are optional.
`breakpoints`
- Array of strings
- Defines responsive breakpoint width values
- E.g. `['500px', '700px']`
- Default value: `['40em', '52em', '64em']`
`alignItems`
- String
- Defines the vertical alignment of items in the grid
- E.g. `'end'`
`justifyItems`
- String
- Defines the horizontal alignment of items in the grid
- E.g. `'center'`
`gridGap`
- String
- Defines the amount of space between grid items (vertically and horizontally)
- E.g. `'1em'`
`numRows`
- Integer
- Defines the number of rows the grid should have (rows are usually added automatically)
- E.g. `4`
`rowHeight`
- String
- Defines the height of the rows
- E.g. `'2em'`
`fixedRows`
- String
- Defines the number of rows, as well as their heights
- E.g. `'2em 1em'` or `'repeat(4, 1em)'`
- Note that you may prefer to use fractional heights, using the `fr` unit (instead of `em` in the above examples)
`numColumns`
- Integer
- Defines the number of columns the grid should have
- E.g. `2`
`columnWidth`
- String
- Defines the width of the columns
- E.g. `'2em'`
`fixedColumns`
- String
- Defines the number of columns, as well as their widths
- E.g. `'2em 1em'` or `'repeat(4, 1em)'`
- Note that you may prefer to use fractional widths, using the `fr` unit (instead of `em` in the above examples)
### `GridItem` props
Note that all `GridItem` props are optional.
`rowStart`
- Integer
- Defines the row that the item should start at (inclusive)
- E.g. `2`
- Note that row counting starts at `1`
`rowEnd`
- Integer
- Defines the row that the item should end at (exclusive)
- E.g. `4`
`rowSpan`
- Integer
- Defines how many rows the item should cover
- E.g. `2`
`columnStart`
- Integer
- Defines the column that the item should start at (inclusive)
- E.g. `2`
- Note that column counting starts at `1`
`columnEnd`
- Integer
- Defines the column that the item should end at (exclusive)
- E.g. `4`
`columnSpan`
- Integer
- Defines how many columns the item should cover
- E.g. `2`
`gridArea`
- String
- Defines precisely where the item should be placed in the grid
- E.g. `'1 / 1 / 2 / 3'` – this translates to: `rowStart: 1`, `columnStart: 1`, `rowEnd: 2`, `columnEnd: 3`
### Responsiveness
For all `Grid` and `GridItem` props, you may provide a single value (as documented above), or an array of values – if you provide an array of values, each value will be used at appropriate responsive breakpoints. For example, if you provide `[1, 2, 3]` as the value for a prop, `1` will be used below the smallest breakpoint, `2` will be used from the next breakpoint and up, `3` will be used from the next breakpoint and up etc. Also note that if you provide a single value for a prop, that value will be used at all breakpoints.
## Examples
### Uniform Grid
If you're only interested in defining a simple, uniform layout and don't need to position and manipulate individual items within your grid, then you don't need to use the `GridItem` component at all, and can pass your own custom components as children to the `Grid`. For example:
Mobile View:
Desktop View:
```js
import React from "react";
import { Grid } from "regridder";
// This is just to add a border for better visibility of grid items
const itemStyle = { border: "1px solid black" };
const MyUniformLayout = () => (
Item 1
Item 2
Item 3
Item 4
);
export default MyUniformLayout;
```
### Spanning Grid Items Across Rows And Columns
Here we define a grid with 3 columns and add 6 items to the grid, specifying how many rows and columns some of the items should span, while keeping defaults for others. Note that by default, a grid item will span one column and one row.
```js
import React from "react";
import { Grid, GridItem as BaseGridItem } from "regridder";
// This is just to add a border for better visibility of grid items
const GridItem = props => (
);
const MySimpleLayout = () => (
Item 1
Item 2
Item 3
Item 4
Item 5
Item 6
);
export default MySimpleLayout;
```
### Responsive Grid
Creating a layout that is responsive to the screen width of a user's device can be achieved by simply providing arrays of values for relevant props in the Grid and/or GridItem components. In the following example, we specify that the number of columns, the row height and the width/height of various grid items should vary respective to the default breakpoints (`['40em', '52em', '64em']`). Note that you can also provide your own breakpoints to the `Grid` component, and you can use whichever unit of measurement you'd prefer.
Mobile View:
Desktop View:
```js
import React from "react";
import { Grid, GridItem as BaseGridItem } from "regridder";
// This is just to add a border for better visibility of grid items
const GridItem = props => (
);
const MyResponsiveLayout = () => (
Item 1
Item 2
Item 3
Item 4
Item 5
Item 6
);
export default MyResponsiveLayout;
```