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react-hooks.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Gridstack.js React integration example</title>
<link rel="stylesheet" href="demo.css" />
<script src="../dist/gridstack-all.js"></script>
<!-- Scripts to use react inside html -->
<script src="https://unpkg.com/react@16/umd/react.production.min.js"></script>
<script src="https://unpkg.com/react-dom@16/umd/react-dom.production.min.js"></script>
<script src="https://unpkg.com/babel-standalone@6.15.0/babel.min.js"></script>
</head>
<body>
<div>
<h1>Using GridStack.js with React hooks</h1>
<p>
As with any virtual DOM based framework, you need to check if React has rendered the DOM (or any updates to it)
<strong>before</strong> you initialize GridStack or call its methods. This example shows how to make rendered
components widgets:
</p>
<ol>
<li>Render items, each with a reference</li>
<li>Convert each rendered item to a widget using the reference and the <a
href="https://github.com/gridstack/gridstack.js/tree/master/doc#makewidgetel">
makeWidget()</a> function</li>
</ol>
</div>
<div>
<h2>Controlled stack</h2>
<div id="controlled-stack"></div>
</div>
<div>
<h2>Uncontrolled stack</h2>
<div id="uncontrolled-stack"></div>
</div>
</body>
<script type="text/babel">
const { useState, useEffect, createRef, useRef } = React
const Item = ({ id }) => <div>{id}</div>
//
// Controlled example
//
const ControlledStack = ({ items, addItem }) => {
const refs = useRef({})
const gridRef = useRef()
if (Object.keys(refs.current).length !== items.length) {
items.forEach(({ id }) => {
refs.current[id] = refs.current[id] || createRef()
})
}
useEffect(() => {
gridRef.current = gridRef.current ||
GridStack.init({float: true}, '.controlled')
const grid = gridRef.current
grid.batchUpdate()
grid.removeAll(false)
items.forEach(({ id }) => grid.makeWidget(refs.current[id].current))
grid.batchUpdate(false)
}, [items])
return (
<div>
<button onClick={addItem}>Add new widget</button>
<div className={`grid-stack controlled`}>
{items.map((item, i) => {
return (
<div ref={refs.current[item.id]} key={item.id} className={'grid-stack-item'}>
<div className="grid-stack-item-content">
<Item {...item} />
</div>
</div>
)
})}
</div>
</div>
)
}
const ControlledExample = () => {
const [items, setItems] = useState([{ id: 'item-1' }, { id: 'item-2' }])
return (
<ControlledStack
items={items}
addItem={() => setItems([...items, { id: `item-${items.length + 1}` }])}
/>
)
}
//
// Uncontrolled example
//
const UncontrolledExample = () => {
const gridRef = useRef()
const [state, setState] = useState({
count: 0,
info: '',
items: [
{ x: 2, y: 1, h: 2 },
{ x: 2, y: 4, w: 3 },
{ x: 4, y: 2 },
{ x: 3, y: 1, h: 2 },
{ x: 0, y: 6, w: 2, h: 2 },
],
})
useEffect(() => {
gridRef.current = gridRef.current ||
GridStack.init(
{
float: true,
cellHeight: '70px',
minRow: 1,
},
'.uncontrolled'
)
const grid = gridRef.current
grid.on('dragstop', (event, element) => {
const node = element.gridstackNode
setState(prevState => ({
...prevState,
info: `you just dragged node #${node.id} to ${node.x},${node.y} – good job!`,
}))
let timerId
window.clearTimeout(timerId)
timerId = window.setTimeout(() => {
setState(prevState => ({
...prevState,
info: '',
}))
}, 2000)
})
}, [])
return (
<div>
<button
onClick={() => {
const grid = gridRef.current
const node = state.items[state.count] || {
x: Math.round(12 * Math.random()),
y: Math.round(5 * Math.random()),
w: Math.round(1 + 3 * Math.random()),
h: Math.round(1 + 3 * Math.random()),
}
node.id = node.content = String(state.count)
setState(prevState => ({
...prevState,
count: prevState.count + 1,
}))
grid.addWidget(node)
}}
>
Add Widget
</button>
<div>{JSON.stringify(state)}</div>
<section class="grid-stack uncontrolled"></section>
</div>
)
}
ReactDOM.render(<ControlledExample />, document.getElementById('controlled-stack'))
ReactDOM.render(<UncontrolledExample />, document.getElementById('uncontrolled-stack'))
</script>
</html>