useHistoryState
Add undo / redo functionality with useHistoryState.
Install:
npm i @uidotdev/usehooks
Description:
The useHistoryState hook is useful for managing state with undo and redo capabilities in React components. The hook offers functions like undo, redo, set, and clear to interact with the state as well as other state related values like canUndo and canRedo.
Parameters
| Name | Type | Description |
|---|---|---|
| initialPresent | object | (Optional) The initial state value. Default: {}. |
Return Value
The useHistoryState hook returns an object with the following properties and functions:
| Name | Type | Description |
|---|---|---|
| state | any | The current state value. |
| set | function | A function to set the state value. |
| undo | function | A function to undo the previous state. |
| redo | function | A function to redo the next state. |
| clear | function | A function to clear the state history and reset the state. |
| canUndo | boolean | Indicates whether an undo action is available. |
| canRedo | boolean | Indicates whether a redo action is available. |
Demo:
Example:
import * as React from "react";
import Form from "./Form";
import { useHistoryState } from "@uidotdev/usehooks";
export default function App() {
const { state, set, undo, redo, clear, canUndo, canRedo } = useHistoryState({
items: [],
});
const addTodo = (val) => {
set({
...state,
items: state.items.concat({ id: crypto.randomUUID(), name: val }),
});
};
const removeTodo = (id) => {
set({
...state,
items: state.items.filter((item) => item.id !== id),
});
};
return (
<section>
<header>
<h1>useHistoryState</h1>
<div>
<button disabled={!canUndo} className="link" onClick={undo}>
Undo
</button>
<button disabled={!canRedo} className="link" onClick={redo}>
Redo
</button>
<button
disabled={!state.items.length}
className="link"
onClick={clear}
>
Clear
</button>
</div>
<Form addItem={addTodo} />
</header>
<ul>
{state.items.map((item, index) => {
return (
<li key={index}>
<span>{item.name}</span>
<button className="link" onClick={() => removeTodo(item.id)}>
Delete
</button>
</li>
);
})}
</ul>
</section>
);
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