Appsemble Preact SDK
Build your own blocks using Preact
Table of Contents
Installation
npm install @appsemble/preact preact
Usage
This package integrates Preact with
@appsemble/sdk. Please read the documentation for
a better understanding of how to use it.
bootstrap()
The bootstrap function takes a Preact component as an argument and renders. It takes the Appsemble
block context as its props, extended with the ready() function. The ready() function needs to be
called when the block is done rendering. Actions won’t be finalized for any blocks on the page,
until all blocks are ready.
import { bootstrap } from '@appsemble/preact';
import { useEffect } from 'preact/hooks';
bootstrap(({ actions }) => {
useEffect(() => {
ready();
}, []);
return (
<button onClick={() => actions.onClick()} type="button">
Hello world!
</button>
);
});
Note: The script will be loaded only once. The component is then bootstrapped for every instance of your block type that is loaded by the app creator.
useBlock()
Get the block context. This is available for components that are rendered within a subtree of a
component rendered by bootstrap
import { useBlock } from '@appsemble/preact';
import { type VNode } from 'preact';
export function MyButton(): VNode {
const { actions } = useBlock();
return (
<button onClick={() => actions.onClick()} type="button">
Hello world!
</button>
);
}
<FormattedMessage />
This helper component renders a translated message ID.
import { FormattedMessage } from '@appsemble/preact';
import { type VNode } from 'preact';
interface MyButtonProps {
readonly name: string;
}
export function MyButton({ name }: MyButtonProps): VNode {
return (
<button type="button">
<FormattedMessage id="myButtonLabel" values={{ name }} />
</button>
);
}