aakansha-excalidraw

Excalidraw

Excalidraw exported as a component to directly embed in your projects.

Installation

You can use npm

npm install react react-dom @excalidraw/excalidraw

or via yarn

yarn add react react-dom @excalidraw/excalidraw

After installation you will see a folder excalidraw-assets and excalidraw-assets-dev in dist directory which contains the assets needed for this app in prod and dev mode respectively.

Move the folder excalidraw-assets and excalidraw-assets-dev to the path where your assets are served.

By default it will try to load the files from https://unpkg.com/@excalidraw/excalidraw/dist/

If you want to load assets from a different path you can set a variable window.EXCALIDRAW_ASSET_PATH depending on environment (for example if you have different URL's for dev and prod) to the url from where you want to load the assets.

Note

If you don't want to wait for the next stable release and try out the unreleased changes you can use @excalidraw/excalidraw@next.

Demo

Try here.

Usage

Using Web Bundler

If you are using a Web bundler (for instance, Webpack), you can import it as an ES6 module as shown below

View Example

import React, { useEffect, useState, useRef } from "react";
import { Excalidraw } from "@excalidraw/excalidraw";
import InitialData from "./initialData";

import "./styles.scss";

export default function App() {
  const excalidrawRef = useRef(null);

  const [viewModeEnabled, setViewModeEnabled] = useState(false);
  const [zenModeEnabled, setZenModeEnabled] = useState(false);
  const [gridModeEnabled, setGridModeEnabled] = useState(false);

  const updateScene = () => {
    const sceneData = {
      elements: [
        {
          type: "rectangle",
          version: 141,
          versionNonce: 361174001,
          isDeleted: false,
          id: "oDVXy8D6rom3H1-LLH2-f",
          fillStyle: "hachure",
          strokeWidth: 1,
          strokeStyle: "solid",
          roughness: 1,
          opacity: 100,
          angle: 0,
          x: 100.50390625,
          y: 93.67578125,
          strokeColor: "#c92a2a",
          backgroundColor: "transparent",
          width: 186.47265625,
          height: 141.9765625,
          seed: 1968410350,
          groupIds: [],
        },
      ],
      appState: {
        viewBackgroundColor: "#edf2ff",
      },
    };
    excalidrawRef.current.updateScene(sceneData);
  };

  return (
    <div className="App">
      <h1> Excalidraw Example</h1>
      <div className="button-wrapper">
        <button className="update-scene" onClick={updateScene}>
          Update Scene
        </button>
        <button
          className="reset-scene"
          onClick={() => {
            excalidrawRef.current.resetScene();
          }}
        >
          Reset Scene
        </button>
        <label>
          <input
            type="checkbox"
            checked={viewModeEnabled}
            onChange={() => setViewModeEnabled(!viewModeEnabled)}
          />
          View mode
        </label>
        <label>
          <input
            type="checkbox"
            checked={zenModeEnabled}
            onChange={() => setZenModeEnabled(!zenModeEnabled)}
          />
          Zen mode
        </label>
        <label>
          <input
            type="checkbox"
            checked={gridModeEnabled}
            onChange={() => setGridModeEnabled(!gridModeEnabled)}
          />
          Grid mode
        </label>
      </div>
      <div className="excalidraw-wrapper">
        <Excalidraw
          ref={excalidrawRef}
          initialData={InitialData}
          onChange={(elements, state) =>
            console.log("Elements :", elements, "State : ", state)
          }
          onPointerUpdate={(payload) => console.log(payload)}
          onCollabButtonClick={() =>
            window.alert("You clicked on collab button")
          }
          viewModeEnabled={viewModeEnabled}
          zenModeEnabled={zenModeEnabled}
          gridModeEnabled={gridModeEnabled}
        />
      </div>
    </div>
  );
}

To view the full example visit :point_down:

Since Excalidraw doesn't support server side rendering yet, you should render the component once the host is mounted.

import { useState, useEffect } from "react";
export default function IndexPage() {
  const [Comp, setComp] = useState(null);
  useEffect(() => {
    import("@excalidraw/excalidraw").then((comp) => setComp(comp.default));
  }, []);
  return <>{Comp && <Comp />}</>;
}

The types are available at @excalidraw/excalidraw/types, you can view example for typescript

In Browser

To use it in a browser directly:

For development use :point_down:

<script
  type="text/javascript"
  src="https://unpkg.com/@excalidraw/excalidraw/dist/excalidraw.development.js"
></script>

For production use :point_down:

<script
  type="text/javascript"
  src="https://unpkg.com/@excalidraw/excalidraw/dist/excalidraw.production.min.js"
></script>

You will need to make sure react, react-dom is available as shown in the below example. For prod please use the production versions of react, react-dom.

View Example

<!DOCTYPE html>
<html>
  <head>
    <title>Excalidraw in browser</title>
    <meta charset="UTF-8" />
    <script src="https://unpkg.com/react@16.14.0/umd/react.development.js"></script>
    <script src="https://unpkg.com/react-dom@16.13.1/umd/react-dom.development.js"></script>

    <script
      type="text/javascript"
      src="https://unpkg.com/@excalidraw/excalidraw/dist/excalidraw.development.js"
    ></script>
  </head>

  <body>
    <div class="container">
      <h1>Excalidraw Embed Example</h1>
      <div id="app"></div>
    </div>
    <script type="text/javascript" src="src/index.js"></script>
  </body>
</html>

/*eslint-disable */
import "./styles.css";
import InitialData from "./initialData";

const App = () => {
  const excalidrawRef = React.useRef(null);

  const [viewModeEnabled, setViewModeEnabled] = React.useState(false);
  const [zenModeEnabled, setZenModeEnabled] = React.useState(false);
  const [gridModeEnabled, setGridModeEnabled] = React.useState(false);

  const updateScene = () => {
    const sceneData = {
      elements: [
        {
          type: "rectangle",
          version: 141,
          versionNonce: 361174001,
          isDeleted: false,
          id: "oDVXy8D6rom3H1-LLH2-f",
          fillStyle: "hachure",
          strokeWidth: 1,
          strokeStyle: "solid",
          roughness: 1,
          opacity: 100,
          angle: 0,
          x: 100.50390625,
          y: 93.67578125,
          strokeColor: "#c92a2a",
          backgroundColor: "transparent",
          width: 186.47265625,
          height: 141.9765625,
          seed: 1968410350,
          groupIds: [],
        },
      ],
      appState: {
        viewBackgroundColor: "#edf2ff",
      },
    };
    excalidrawRef.current.updateScene(sceneData);
  };

  return React.createElement(
    React.Fragment,
    null,
    React.createElement(
      "div",
      { className: "button-wrapper" },
      React.createElement(
        "button",
        {
          className: "update-scene",
          onClick: updateScene,
        },
        "Update Scene",
      ),
      React.createElement(
        "button",
        {
          className: "reset-scene",
          onClick: () => excalidrawRef.current.resetScene(),
        },
        "Reset Scene",
      ),
      React.createElement(
        "label",
        null,
        React.createElement("input", {
          type: "checkbox",
          checked: viewModeEnabled,
          onChange: () => setViewModeEnabled(!viewModeEnabled),
        }),
        "View mode",
      ),
      React.createElement(
        "label",
        null,
        React.createElement("input", {
          type: "checkbox",
          checked: zenModeEnabled,
          onChange: () => setZenModeEnabled(!zenModeEnabled),
        }),
        "Zen mode",
      ),
      React.createElement(
        "label",
        null,
        React.createElement("input", {
          type: "checkbox",
          checked: gridModeEnabled,
          onChange: () => setGridModeEnabled(!gridModeEnabled),
        }),
        "Grid mode",
      ),
    ),
    React.createElement(
      "div",
      {
        className: "excalidraw-wrapper",
        ref: excalidrawWrapperRef,
      },
      React.createElement(ExcalidrawLib.Excalidraw, {
        initialData: InitialData,
        onChange: (elements, state) =>
          console.log("Elements :", elements, "State : ", state),
        onPointerUpdate: (payload) => console.log(payload),
        onCollabButtonClick: () => window.alert("You clicked on collab button"),
        viewModeEnabled: viewModeEnabled,
        zenModeEnabled: zenModeEnabled,
        gridModeEnabled: gridModeEnabled,
      }),
    ),
  );
};

const excalidrawWrapper = document.getElementById("app");

ReactDOM.render(React.createElement(App), excalidrawWrapper);

To view the full example visit :point_down:

Customizing styles

Excalidraw is using CSS variables to style certain components. To override them, you should set your own on the .excalidraw and .excalidraw.theme--dark (for dark mode variables) selectors.

Make sure the selector has higher specificity, e.g. by prefixing it with your app's selector:

.your-app .excalidraw {
  --color-primary: red;
}
.your-app .excalidraw.theme--dark {
  --color-primary: pink;
}

Most notably, you can customize the primary colors, by overriding these variables:

• --color-primary
• --color-primary-darker
• --color-primary-darkest
• --color-primary-light
• --color-primary-contrast-offset — a slightly darker (in light mode), or lighter (in dark mode) --color-primary color to fix contrast issues (see Chubb illusion). It will fall back to --color-primary if not present.

For a complete list of variables, check theme.scss, though most of them will not make sense to override.

Props

Name	Type	Default	Description
onChange	Function		This callback is triggered whenever the component updates due to any change. This callback will receive the excalidraw elements and the current app state.
initialData	{elements?: ExcalidrawElement[], appState?: AppState }	null	The initial data with which app loads.
ref	createRef | useRef | callbackRef | { current: { readyPromise: resolvablePromise } }		Ref to be passed to Excalidraw
onCollabButtonClick	Function		Callback to be triggered when the collab button is clicked
isCollaborating	boolean		This implies if the app is in collaboration mode
onPointerUpdate	Function		Callback triggered when mouse pointer is updated.
langCode	string	en	Language code string
renderTopRightUI	Function		Function that renders custom UI in top right corner
renderFooter	Function		Function that renders custom UI footer
renderCustomStats	Function		Function that can be used to render custom stats on the stats dialog.
viewModeEnabled	boolean		This implies if the app is in view mode.
zenModeEnabled	boolean		This implies if the zen mode is enabled
gridModeEnabled	boolean		This implies if the grid mode is enabled
libraryReturnUrl	string		What URL should libraries.excalidraw.com be installed to
theme	THEME.LIGHT | THEME.LIGHT	THEME.LIGHT	The theme of the Excalidraw component
name	string		Name of the drawing
UIOptions	{ canvasActions: CanvasActions }	DEFAULT UI OPTIONS	To customise UI options. Currently we support customising canvas actions
onPaste	(data: ClipboardData, event: ClipboardEvent | null) => boolean		Callback to be triggered if passed when the something is pasted in to the scene
detectScroll	boolean	true	Indicates whether to update the offsets when nearest ancestor is scrolled.
handleKeyboardGlobally	boolean	false	Indicates whether to bind the keyboard events to document.
onLibraryChange	(items: LibraryItems) => void | Promise<any>		The callback if supplied is triggered when the library is updated and receives the library items.
autoFocus	boolean	false	Implies whether to focus the Excalidraw component on page load
generateIdForFile	`(file: File) => string	Promise`	Allows you to override id generation for files added on canvas
onLinkOpen	(element: NonDeletedExcalidrawElement, event: CustomEvent)		This prop if passed will be triggered when link of an element is clicked.
onPointerDown	(activeTool: AppState["activeTool"], pointerDownState: PointerDownState) => void		This prop if passed gets triggered on pointer down evenets
onScrollChange	(scrollX: number, scrollY: number)		This prop if passed gets triggered when scrolling the canvas.

Dimensions of Excalidraw

Excalidraw takes 100% of width and height of the containing block so make sure the container in which you render Excalidraw has non zero dimensions.

onChange

Every time component updates, this callback if passed will get triggered and has the below signature.

(excalidrawElements, appState, files) => void;

1.excalidrawElements: Array of excalidrawElements in the scene.

2.appState: AppState of the scene.

1. files: The [BinaryFiles](BinaryFiles which are added to the scene.

Here you can try saving the data to your backend or local storage for example.

initialData

This helps to load Excalidraw with initialData. It must be an object or a promise which resolves to an object containing the below optional fields.

Name	Type	Description
elements	ExcalidrawElement[]	The elements with which Excalidraw should be mounted.
appState	AppState	The App state with which Excalidraw should be mounted.
scrollToContent	boolean	This attribute implies whether to scroll to the nearest element to center once Excalidraw is mounted. By default, it will not scroll the nearest element to the center. Make sure you pass initialData.appState.scrollX and initialData.appState.scrollY when scrollToContent is false so that scroll positions are retained
libraryItems	LibraryItems | Promise<LibraryItems>	This library items with which Excalidraw should be mounted.
files	BinaryFiles	The files added to the scene.

{
  "elements": [
    {
      "type": "rectangle",
      "version": 141,
      "versionNonce": 361174001,
      "isDeleted": false,
      "id": "oDVXy8D6rom3H1-LLH2-f",
      "fillStyle": "hachure",
      "strokeWidth": 1,
      "strokeStyle": "solid",
      "roughness": 1,
      "opacity": 100,
      "angle": 0,
      "x": 100.50390625,
      "y": 93.67578125,
      "strokeColor": "#000000",
      "backgroundColor": "transparent",
      "width": 186.47265625,
      "height": 141.9765625,
      "seed": 1968410350,
      "groupIds": []
    }
  ],
  "appState": { "zenModeEnabled": true, "viewBackgroundColor": "#AFEEEE" }
}

You might want to use this when you want to load excalidraw with some initial elements and app state.

ref

You can pass a ref when you want to access some excalidraw APIs. We expose the below APIs:

| API | signature | Usage | | --- | --- | --- | --- | | ready | boolean | This is set to true once Excalidraw is rendered | | readyPromise | resolvablePromise | This promise will be resolved with the api once excalidraw has rendered. This will be helpful when you want do some action on the host app once this promise resolves. For this to work you will have to pass ref as shown here | | updateScene | (scene: sceneData) => void | updates the scene with the sceneData | | updateLibrary | (opts) => Promise<LibraryItems> | updates the scene with the sceneData | | addFiles | (files: BinaryFileData) => void | add files data to the appState | | resetScene | ({ resetLoadingState: boolean }) => void | Resets the scene. If resetLoadingState is passed as true then it will also force set the loading state to false. | | getSceneElementsIncludingDeleted | () => ExcalidrawElement[] | Returns all the elements including the deleted in the scene | | getSceneElements | () => ExcalidrawElement[] | Returns all the elements excluding the deleted in the scene | | getAppState | () => AppState | Returns current appState | | history | { clear: () => void } | This is the history API. history.clear() will clear the history | | scrollToContent | (target?: ExcalidrawElement | ExcalidrawElement[]) => void | Scroll the nearest element out of the elements supplied to the center. Defaults to the elements on the scene. | | refresh | () => void | Updates the offsets for the Excalidraw component so that the coordinates are computed correctly (for example the cursor position). You don't have to call this when the position is changed on page scroll or when the excalidraw container resizes (we handle that ourselves). For any other cases if the position of excalidraw is updated (example due to scroll on parent container and not page scroll) you should call this API. | | importLibrary | (url: string, token?: string) => void | Imports library from given URL | | setToast | ({message: string, closable?:boolean, duration?:number} | null) => void | This API can be used to show the toast with custom message. | | id | string | Unique ID for the excalidraw component. | | getFiles | () => files | This API can be used to get the files present in the scene. It may contain files that aren't referenced by any element, so if you're persisting the files to a storage, you should compare them against stored elements. | | setActiveTool | (tool: { type: typeof SHAPES[number]["value"] | "eraser" } | { type: "custom"; customType: string }) => void | This API can be used to set the active tool | | setCursor | (cursor: string) => void | This API can be used to set customise the mouse cursor on the canvas | | resetCursor | () => void | This API can be used to reset to default mouse cursor on the canvas |

readyPromise

const excalidrawRef = { current: { readyPromise: resolvablePromise}}

Since plain object is passed as a ref, the readyPromise is resolved as soon as the component is mounted. Most of the time you will not need this unless you have a specific use case where you can't pass the ref in the react way and want to do some action on the host when this promise resolves. You can check the example for the usage.

updateScene

(scene: sceneData) => void

You can use this function to update the scene with the sceneData. It accepts the below attributes.

Name	Type	Description
elements	ImportedDataState["elements"]	The elements to be updated in the scene
appState	ImportedDataState["appState"]	The appState to be updated in the scene.
collaborators	Map<string, Collaborator>	The list of collaborators to be updated in the scene.
commitToHistory	boolean	Implies if the history (undo/redo) should be recorded. Defaults to false.
libraryItems	LibraryItems | Promise<LibraryItems> | ((currentItems: LibraryItems>) => LibraryItems | Promise<LibraryItems>)	The libraryItems to be update in the scene.

updateLibrary

(opts: {
  libraryItems: LibraryItemsSource;
  merge?: boolean;
  prompt?: boolean;
  openLibraryMenu?: boolean;
  defaultStatus?: "unpublished" | "published";
}) => Promise<LibraryItems>

You can use this function to update the library. It accepts the below attributes.

Name	Type	Default	Description
libraryItems		LibraryItems	The libraryItems to be replaced/merged with current library
merge	boolean	false	Whether to merge with existing library items.
prompt	boolean	false	Whether to prompt user for confirmation.
openLibraryMenu	boolean	false	Whether to open the library menu before importing.
defaultStatus	"unpublished" | "published"	"unpublished"	Default library item's status if not present.

addFiles

(files: BinaryFileData) => void 

Adds supplied files data to the appState.files cache on top of existing files present in the cache.

onCollabButtonClick

This callback is triggered when clicked on the collab button in excalidraw. If not supplied, the collab dialog button is not rendered.

isCollaborating

This prop indicates if the app is in collaboration mode.

onPointerUpdate

This callback is triggered when mouse pointer is updated.

({ x, y }, button, pointersMap}) => void;

1.{x, y}: Pointer coordinates

2.button: The position of the button. This will be one of ["down", "up"]

3.pointersMap: pointers map of the scene

(exportedElements, appState, canvas) => void

1. exportedElements: An array of non deleted elements which needs to be exported.
2. appState: AppState of the scene.
3. canvas: The HTMLCanvasElement of the scene.

langCode

Determines the language of the UI. It should be one of the available language codes. Defaults to en (English). We also export default language and supported languages which you can import as shown below.

import { defaultLang, languages } from "@excalidraw/excalidraw";

name	type
defaultLang	string
languages	Language[]

renderTopRightUI

(isMobile: boolean, appState: AppState) => JSX | null

A function returning JSX to render custom UI in the top right corner of the app.

renderFooter

(isMobile: boolean, appState: AppState) => JSX | null

A function returning JSX to render custom UI footer. For example, you can use this to render a language picker that was previously being rendered by Excalidraw itself (for now, you'll need to implement your own language picker).

renderCustomStats

A function that can be used to render custom stats (returns JSX) in the nerd stats dialog. For example you can use this prop to render the size of the elements in the storage.

viewModeEnabled

This prop indicates whether the app is in view mode. When supplied, the value takes precedence over intialData.appState.viewModeEnabled, the view mode will be fully controlled by the host app, and users won't be able to toggle it from within the app.

zenModeEnabled

This prop indicates whether the app is in zen mode. When supplied, the value takes precedence over intialData.appState.zenModeEnabled, the zen mode will be fully controlled by the host app, and users won't be able to toggle it from within the app.

gridModeEnabled

This prop indicates whether the shows the grid. When supplied, the value takes precedence over intialData.appState.gridModeEnabled, the grid will be fully controlled by the host app, and users won't be able to toggle it from within the app.

libraryReturnUrl

If supplied, this URL will be used when user tries to install a library from libraries.excalidraw.com. Defaults to window.location.origin + window.location.pathname. To install the libraries in the same tab from which it was opened, you need to set window.name (to any alphanumeric string) — if it's not set it will open in a new tab.

theme

This prop controls Excalidraw's theme. When supplied, the value takes precedence over intialData.appState.theme, the theme will be fully controlled by the host app, and users won't be able to toggle it from within the app. You can use THEME to specify the theme.

name

This prop sets the name of the drawing which will be used when exporting the drawing. When supplied, the value takes precedence over intialData.appState.name, the name will be fully controlled by host app and the users won't be able to edit from within Excalidraw.

UIOptions

This prop can be used to customise UI of Excalidraw. Currently we support customising canvasActions and dockedSidebarBreakpoint. It accepts the below parameters

{ canvasActions:  CanvasActions }

canvasActions

Attribute	Type	Default	Description
changeViewBackgroundColor	boolean	true	Implies whether to show Background color picker
clearCanvas	boolean	true	Implies whether to show Clear canvas button
export	false | exportOpts	{ saveFileToDisk: true }	This prop allows to customize the UI inside the export dialog. By default it shows the "saveFileToDisk". If this prop is false the export button will not be rendered. For more details visit exportOpts.
loadScene	boolean	true	Implies whether to show Load button
saveToActiveFile	boolean	true	Implies whether to show Save button to save to current file
theme	boolean	true	Implies whether to show Theme toggle
saveAsImage	boolean	true	Implies whether to show Save as image button

dockedSidebarBreakpoint

This prop indicates at what point should we break to a docked, permanent sidebar. If not passed it defaults to MQ_RIGHT_SIDEBAR_MAX_WIDTH_PORTRAIT. If the width of the excalidraw container exceeds dockedSidebarBreakpoint, the sidebar will be dockable. If user choses to dock the sidebar, it will push the right part of the UI towards the left, making space for the sidebar as shown below.

exportOpts

The below attributes can be set in UIOptions.canvasActions.export to customize the export dialog. If UIOptions.canvasActions.export is false the export button will not be rendered.

Attribute	Type	Default	Description
saveFileToDisk	boolean	true	Implies if save file to disk button should be shown
onExportToBackend	(exportedElements: readonly NonDeletedExcalidrawElement[],appState: AppState,canvas: HTMLCanvasElement | null) => void		This callback is triggered when the shareable-link button is clicked in the export dialog. The link button will only be shown if this callback is passed.
renderCustomUI	(exportedElements: readonly NonDeletedExcalidrawElement[],appState: AppState,canvas: HTMLCanvasElement | null) => void		This callback should be supplied if you want to render custom UI in the export dialog.

onPaste

This callback is triggered if passed when something is pasted into the scene. You can use this callback in case you want to do something additional when the paste event occurs.

(data: ClipboardData, event: ClipboardEvent | null) => boolean

This callback must return a boolean value or a promise which resolves to a boolean value.

In case you want to prevent the excalidraw paste action you must return false, it will stop the native excalidraw clipboard management flow (nothing will be pasted into the scene).

importLibrary

Imports library from given URL. You should call this on hashchange, passing the addLibrary value if you detect it as shown below. Optionally pass a CSRF token to skip prompting during installation (retrievable via token key from the url coming from https://libraries.excalidraw.com).

useEffect(() => {
  const onHashChange = () => {
    const hash = new URLSearchParams(window.location.hash.slice(1));
    const libraryUrl = hash.get("addLibrary");
    if (libraryUrl) {
      excalidrawRef.current.importLibrary(libraryUrl, hash.get("token"));
    }
  };
  window.addEventListener("hashchange", onHashChange, false);
  return () => {
    window.removeEventListener("hashchange", onHashChange);
  };
}, []);

Try out the Demo to see it in action.

setToast

This API can be used to show the toast with custom message.

({ message: string,
 closable?:boolean,
 duration?:number } | null) => void

Attribute	type	Description
message	string	The message to be shown on the toast.
closable	boolean	Indicates whether to show the closable button on toast to dismiss the toast.
duration	number	Determines the duration after which the toast should auto dismiss. To prevent autodimiss you can pass Infinity.

To dismiss an existing toast you can simple pass null

setToast(null);

setActiveTool

This API has the below signature. It sets the tool passed in param as the active tool.

(tool: { type: typeof SHAPES[number]["value"] | "eraser" } | { type: "custom"; customType: string }) => void

setCursor

This API can be used to customise the mouse cursor on the canvas and has the below signature. It sets the mouse cursor to the cursor passed in param.

(cursor: string) => void

resetCursor

This API can be used to reset to default mouse cursor.

detectScroll

Indicates whether Excalidraw should listen for scroll event on the nearest scrollable container in the DOM tree and recompute the coordinates (e.g. to correctly handle the cursor) when the component's position changes. You can disable this when you either know this doesn't affect your app or you want to take care of it yourself (calling the refresh() method).

handleKeyboardGlobally

Indicates whether to bind keyboard events to document. Disabled by default, meaning the keyboard events are bound to the Excalidraw component. This allows for multiple Excalidraw components to live on the same page, and ensures that Excalidraw keyboard handling doesn't collide with your app's (or the browser) when the component isn't focused.

Enable this if you want Excalidraw to handle keyboard even if the component isn't focused (e.g. a user is interacting with the navbar, sidebar, or similar).

onLibraryChange

This callback if supplied will get triggered when the library is updated and has the below signature.

(items: LibraryItems) => void | Promise

It is invoked with empty items when user clears the library. You can use this callback when you want to do something additional when library is updated for example persisting it to local storage.

id

The unique id of the excalidraw component. This can be used to identify the excalidraw component, for example importing the library items to the excalidraw component from where it was initiated when you have multiple excalidraw components rendered on the same page as shown in multiple excalidraw demo.

autoFocus

This prop implies whether to focus the Excalidraw component on page load. Defaults to false.

generateIdForFile

Allows you to override id generation for files added on canvas (images). By default, an SHA-1 digest of the file is used.

(file: File) => string | Promise<string>

onLinkOpen

This prop if passed will be triggered when clicked on link. To handle the redirect yourself (such as when using your own router for internal links), you must call event.preventDefault().

(element: ExcalidrawElement, event: CustomEvent<{ nativeEvent: MouseEvent }>) => void

Example:

const history = useHistory();

// open internal links using the app's router, but opens external links in
// a new tab/window
const onLinkOpen: ExcalidrawProps["onLinkOpen"] = useCallback(
  (element, event) => {
    const link = element.link;
    const { nativeEvent } = event.detail;
    const isNewTab = nativeEvent.ctrlKey || nativeEvent.metaKey;
    const isNewWindow = nativeEvent.shiftKey;
    const isInternalLink =
      link.startsWith("/") || link.includes(window.location.origin);
    if (isInternalLink && !isNewTab && !isNewWindow) {
      history.push(link.replace(window.location.origin, ""));
      // signal that we're handling the redirect ourselves
      event.preventDefault();
    }
  },
  [history],
);

onPointerDown

This prop if passed will be triggered on pointer down events and has the below signature.

(activeTool:  AppState["activeTool"], pointerDownState: PointerDownState) => void

onScrollChange

This prop if passed will be triggered when canvas is scrolled and has the below signature.

(scrollX: number, scrollY: number) => void

Does it support collaboration ?

No, Excalidraw package doesn't come with collaboration built in, since the implementation is specific to each host app. We expose APIs which you can use to communicate with Excalidraw which you can use to implement it. You can check our own implementation here.

Restore utilities

restoreAppState

Signature

restoreAppState(appState: ImportedDataState["appState"], localAppState: Partial<AppState> | null): AppState

How to use

import { restoreAppState } from "@excalidraw/excalidraw";

This function will make sure all the keys have appropriate values in appState and if any key is missing, it will be set to default value.

When localAppState is supplied, it's used in place of values that are missing (undefined) in appState instead of defaults. Use this as a way to not override user's defaults if you persist them. Required: supply null/undefined if not applicable.

restoreElements

Signature

restoreElements(elements: ImportedDataState["elements"], localElements: ExcalidrawElement[] | null | undefined): ExcalidrawElement[]

How to use

import { restoreElements } from "@excalidraw/excalidraw";

This function will make sure all properties of element is correctly set and if any attribute is missing, it will be set to default value.

When localElements are supplied, they are used to ensure that existing restored elements reuse version (and increment it), and regenerate versionNonce. Use this when you import elements which may already be present in the scene to ensure that you do not disregard the newly imported elements if you're using element version to detect the updates.

restore

Signature

restoreElements(data: ImportedDataState, localAppState: Partial<AppState> | null | undefined, localElements: ExcalidrawElement[] | null | undefined): DataState

See restoreAppState() about localAppState, and restoreElements() about localElements.

How to use

import { restore } from "@excalidraw/excalidraw";

This function makes sure elements and state is set to appropriate values and set to default value if not present. It is a combination of restoreElements and restoreAppState.

restoreLibraryItems

Signature

restoreLibraryItems(libraryItems: ImportedDataState["libraryItems"], defaultStatus: "published" | "unpublished")

How to use

import { restoreLibraryItems } from "@excalidraw/excalidraw";

restoreLibraryItems(libraryItems, "unpublished");

This function normalizes library items elements, adding missing values when needed.

Export utilities

exportToCanvas

Signature

exportToCanvas({
  elements,
  appState
  getDimensions,
  files
}: ExportOpts

Name	Type	Default	Description
elements	Excalidraw Element []		The elements to be exported to canvas
appState	AppState	defaultAppState	The app state of the scene
getDimensions	(width: number, height: number) => { width: number, height: number, scale?: number }	undefined	A function which returns the width, height, and optionally scale (defaults 1), with which canvas is to be exported.
maxWidthOrHeight	number	undefined	The maximum width or height of the exported image. If provided, getDimensions is ignored.
files	[BinaryFiles](The BinaryFiles	undefined	The files added to the scene.

How to use

import { exportToCanvas } from "@excalidraw/excalidraw";

This function returns the canvas with the exported elements, appState and dimensions.

exportToBlob

Signature

exportToBlob(
  opts: ExportOpts & {
  mimeType?: string,
  quality?: number;
})

Name	Type	Default	Description
opts			This param is passed to exportToCanvas. You can refer to exportToCanvas
mimeType	string	"image/png"	Indicates the image format
quality	number	0.92	A value between 0 and 1 indicating the image quality. Applies only to image/jpeg/image/webp MIME types.

How to use

import { exportToBlob } from "@excalidraw/excalidraw";

Returns a promise which resolves with a blob. It internally uses canvas.ToBlob.

exportToSvg

Signature

exportToSvg({
  elements: ExcalidrawElement[],
  appState: AppState,
  exportPadding?: number,
  metadata?: string,
  files?: BinaryFiles
})

Name	Type	Default	Description
elements	Excalidraw Element []		The elements to exported as svg
appState	AppState	defaultAppState	The app state of the scene
exportPadding	number	10	The padding to be added on canvas
files	[BinaryFiles](The BinaryFiles	undefined	The files added to the scene.

This function returns a promise which resolves to svg of the exported drawing.

exportToClipboard

Signature

exportToClipboard(
  opts: ExportOpts & {
  mimeType?: string,
  quality?: number;
  type: 'png' | 'svg' |'json'
})

| Name | Type | Default | Description | | --- | --- | --- | --- | --- | --- | | opts | | | This param is same as the params passed to exportToCanvas. You can refer to exportToCanvas. | | mimeType | string | "image/png" | Indicates the image format, this will be used when exporting as png. | | quality | number | 0.92 | A value between 0 and 1 indicating the image quality. Applies only to image/jpeg/image/webp MIME types. This will be used when exporting as png. | | type | 'png' | 'svg' | 'json' | | This determines the format to which the scene data should be exported. |

How to use

import { exportToClipboard } from "@excalidraw/excalidraw";

Copies the scene data in the specified format (determined by type) to clipboard.

Additional attributes of appState for export\* APIs

Name	Type	Default	Description
exportBackground	boolean	true	Indicates whether background should be exported
viewBackgroundColor	string	#fff	The default background color
exportWithDarkMode	boolean	false	Indicates whether to export with dark mode
exportEmbedScene	boolean	false	Indicates whether scene data should be embedded in svg/png. This will increase the image size.

Extra API's

serializeAsJSON

Signature

serializeAsJSON({
  elements: ExcalidrawElement[],
  appState: AppState,
}): string

Takes the scene elements and state and returns a JSON string. Deleted elementsas well as most properties from AppState are removed from the resulting JSON. (see serializeAsJSON() source for details).

If you want to overwrite the source field in the JSON string, you can set window.EXCALIDRAW_EXPORT_SOURCE to the desired value.

serializeLibraryAsJSON

Signature

serializeLibraryAsJSON({
  libraryItems: LibraryItems[],

Takes the library items and returns a JSON string.

If you want to overwrite the source field in the JSON string, you can set window.EXCALIDRAW_EXPORT_SOURCE to the desired value.

getSceneVersion

How to use

import { getSceneVersion } from "@excalidraw/excalidraw";
getSceneVersion(elements:  ExcalidrawElement[])

This function returns the current scene version.

isInvisiblySmallElement

Signature

isInvisiblySmallElement(element:  ExcalidrawElement): boolean

How to use

import { isInvisiblySmallElement } from "@excalidraw/excalidraw";

Returns true if element is invisibly small (e.g. width & height are zero).

loadLibraryFromBlob

import { loadLibraryFromBlob } from "@excalidraw/excalidraw";

Signature

loadLibraryFromBlob(blob: Blob)

This function loads the library from the blob.

loadFromBlob

How to use

import { loadFromBlob } from "@excalidraw/excalidraw";

const scene = await loadFromBlob(file, null, null);
excalidrawAPI.updateScene(scene);

Signature

loadFromBlob(
  blob: Blob,
  localAppState: AppState | null,
  localElements: ExcalidrawElement[] | null,
  fileHandle?: FileSystemHandle | null
) => Promise<RestoredDataState>

This function loads the scene data from the blob (or file). If you pass localAppState, localAppState value will be preferred over the appState derived from blob. Throws if blob doesn't contain valid scene data.

loadSceneOrLibraryFromBlob

How to use

import { loadSceneOrLibraryFromBlob, MIME_TYPES } from "@excalidraw/excalidraw";

const contents = await loadSceneOrLibraryFromBlob(file, null, null);
if (contents.type === MIME_TYPES.excalidraw) {
  excalidrawAPI.updateScene(contents.data);
} else if (contents.type === MIME_TYPES.excalidrawlib) {
  excalidrawAPI.updateLibrary(contents.data);
}

Signature

loadSceneOrLibraryFromBlob(
  blob: Blob,
  localAppState: AppState | null,
  localElements: ExcalidrawElement[] | null,
  fileHandle?: FileSystemHandle | null
) => Promise<{ type: string, data: RestoredDataState | ImportedLibraryState}>

This function loads either scene or library data from the supplied blob. If the blob contains scene data, and you pass localAppState, localAppState value will be preferred over the appState derived from blob. Throws if blob doesn't contain neither valid scene data or library data.

getFreeDrawSvgPath

How to use

import { getFreeDrawSvgPath } from "@excalidraw/excalidraw";

Signature

getFreeDrawSvgPath(element: ExcalidrawFreeDrawElement

This function returns the free draw svg path for the element.

isLinearElement

How to use

import { isLinearElement } from "@excalidraw/excalidraw";

Signature

isLinearElement(elementType?: ExcalidrawElement): boolean

This function returns true if the element is linear type (arrow |line) else returns false.

getNonDeletedElements

How to use

import { getNonDeletedElements } from "@excalidraw/excalidraw";

Signature

getNonDeletedElements(elements:  readonly ExcalidrawElement[]): as readonly NonDeletedExcalidrawElement[]

This function returns an array of deleted elements.

mergeLibraryItems

import { mergeLibraryItems } from "@excalidraw/excalidraw";

Signature

mergeLibraryItems(localItems: LibraryItems, otherItems: LibraryItems) => LibraryItems

This function merges two LibraryItems arrays, where unique items from otherItems are sorted first in the returned array.

parseLibraryTokensFromUrl

How to use

import { parseLibraryTokensFromUrl } from "@excalidraw/excalidraw";

Signature

parseLibraryTokensFromUrl(): {
    libraryUrl: string;
    idToken: string | null;
} | null

Parses library parameters from URL if present (expects the #addLibrary hash key), and returns an object with the libraryUrl and idToken. Returns null if #addLibrary hash key not found.

useHandleLibrary

How to use

import { useHandleLibrary } from "@excalidraw/excalidraw";

export const App = () => {
  // ...
  useHandleLibrary({ excalidrawAPI });
};

Signature

useHandleLibrary(opts: {
  excalidrawAPI: ExcalidrawAPI,
  getInitialLibraryItems?: () => LibraryItemsSource
});

A hook that automatically imports library from url if #addLibrary hash key exists on initial load, or when it changes during the editing session (e.g. when a user installs a new library), and handles initial library load if getInitialLibraryItems getter is supplied.

In the future, we will be adding support for handling library persistence to browser storage (or elsewhere).

sceneCoordsToViewportCoords

import { sceneCoordsToViewportCoords } from "@excalidraw/excalidraw";

Signature

sceneCoordsToViewportCoords({sceneX: number, sceneY: number}, appState: AppState): {x: number, y: number}

This function returns equivalent viewport coords for the provided scene coords in params.

viewportCoordsToSceneCoords

import { viewportCoordsToSceneCoords } from "@excalidraw/excalidraw";

Signature

viewportCoordsToSceneCoords({clientX: number, clientY: number}, appState: AppState): {x: number, y: number}

This function returns equivalent scene coords for the provided viewport coords in params.

Exported constants

FONT_FAMILY

How to use

import { FONT_FAMILY } from "@excalidraw/excalidraw";

FONT_FAMILY contains all the font families used in Excalidraw as explained below

Font Family	Description
Virgil	The handwritten font
Helvetica	The Normal Font
Cascadia	The Code Font

Defaults to FONT_FAMILY.Virgil unless passed in initialData.appState.currentItemFontFamily.

THEME

How to use

import { THEME } from "@excalidraw/excalidraw";

THEME contains all the themes supported by Excalidraw as explained below

Theme	Description
LIGHT	The light theme
DARK	The Dark theme

Defaults to THEME.LIGHT unless passed in initialData.appState.theme

MIME_TYPES

**How to use **

import { MIME_TYPES } from "@excalidraw/excalidraw";

MIME_TYPES contains all the mime types supported by Excalidraw.

Need help?

Check out the existing Q&A. If you have any queries or need help, ask us here.

Development

Install the dependencies

yarn

Start the server

yarn start

http://localhost:3001 will open in your default browser.

The example is same as the codesandbox example

Create a test release

You can create a test release by posting the below comment in your pull request

@excalibot trigger release

Once the version is released @excalibot will post a comment with the release version.

Creating a production release

To release the next stable version follow the below steps

yarn prerelease version

You need to pass the version for which you want to create the release. This will make the changes needed before making the release like updating package.json, changelog and more.

The next step is to run the release script

yarn release

This will publish the package.

Right now there are two steps to create a production release but once this works fine these scripts will be combined and more automation will be done.