Elements
In Canva, users can add elements to their designs.
An element is a container that holds some kind of content, such as image content, and can be arranged in a user's design, such as by setting its dimensions and position.
Apps can create and otherwise interact with elements in a variety of ways.
Element types
Apps can interact with wide variety of element types, including:
To learn more about each element type, see the linked pages.
Additional types will be supported in the future.
App elements
There's a special type of element called an app element. An app element is essentially a group element with metadata attached to it. This metadata allows the app to create custom, re-editable elements.
Although app elements share characteristics with elements in general, they're unique enough that they're documented separately. To learn more, see App elements.
Creating elements
Apps can create elements by calling either of the following methods:
addElementAtPoint
addElementAtCursor
Both methods add an element to the user's design, but:
addElementAtPoint
accepts an (optional) position and is only compatible with design types that support absolute positions, which is all design types except for documents.addElementAtCursor
doesn't accept a position and is only compatible with design types that contain streams of text, which is only the document design type.
The supported elements also depend on the method being called:
Where possible, apps should determine the context in which the app is running and either call the compatible method or make it obvious when functionality isn't available:
import { Button, Rows } from "@canva/app-ui-kit";import { addElementAtCursor, addElementAtPoint } from "@canva/design";import { useFeatureSupport } from "utils/use_feature_support";import * as styles from "styles/components.css";export const App = () => {const isSupported = useFeatureSupport();function handleAddElementAtPoint() {if (!isSupported(addElementAtPoint)) {return;}addElementAtPoint({type: "text",children: ["Hello world"],});}function handleAddElementAtCursor() {if (!isSupported(addElementAtCursor)) {return;}addElementAtCursor({type: "text",children: ["Hello world"],});}return (<div className={styles.scrollContainer}><Rows spacing="1u"><Buttonvariant="primary"onClick={handleAddElementAtPoint}disabled={!isSupported(addElementAtPoint)}>Add element at point</Button><Buttonvariant="primary"onClick={handleAddElementAtCursor}disabled={!isSupported(addElementAtCursor)}>Add element at cursor</Button></Rows></div>);};
To learn more, see Feature support.
Positioning elements
The addElementAtPoint
method accepts an optional set of dimensions and position:
import { addElementAtPoint } from "@canva/design";// Upload an image assetconst asset = await upload({type: "image",mimeType: "image/jpeg",url: "https://www.canva.dev/example-assets/image-import/image.jpg",thumbnailUrl:"https://www.canva.dev/example-assets/image-import/thumbnail.jpg",});// Add the image to the designawait addElementAtPoint({type: "image",ref: asset.ref,top: 50,left: 50,width: 1280,height: 720,});
These properties must be used together or not at all. If a position isn't provided, the element is added to the center of the design.
Auto-calculating dimensions
You can set either the width
or height
properties to "auto"
:
import { addElementAtPoint } from "@canva/design";// Upload an image assetconst asset = await upload({type: "image",mimeType: "image/jpeg",url: "https://www.canva.dev/example-assets/image-import/image.jpg",thumbnailUrl:"https://www.canva.dev/example-assets/image-import/thumbnail.jpg",});// Add the image to the designawait addElementAtPoint({type: "image",ref: asset.ref,top: 0,left: 0,width: 1280,height: "auto",});
This maintains the aspect ratio of the element without having to specify a pixel value.
Rotating elements
The addElementAtPoint
method accepts a rotation:
import { addElementAtPoint } from "@canva/design";// Upload an image assetconst asset = await upload({type: "image",mimeType: "image/jpeg",url: "https://www.canva.dev/example-assets/image-import/image.jpg",thumbnailUrl:"https://www.canva.dev/example-assets/image-import/thumbnail.jpg",});// Add the image to the designawait addElementAtPoint({type: "image",ref: asset.ref,top: 0,left: 0,width: 1280,height: "auto",rotation: 90,});
This rotation only has an effect if the element has dimensions and a position.
Element traversal
Apps can traverse the elements in a user's design. This allows the app to read and update the structure of the design and the content of its elements. To learn more, see Design Editing.