Frontend builds

This guide assumes that you’re using a bundler like Webpack or Rollup to assemble your JS bundles, and LSF is installed via a package manager.

In your HTML add the following code:

<div id="label-studio"></div>

Now to initialize the Label Studio Frontend, add the following code to your JS file:

import LabelStudio from 'heartexlabs@label-studio@latest';
import 'heartexlabs@label-studio@latest/build/static/css/main.css';

const labelStudio = new LabelStudio('label-studio', {
  config: `
    <View>
      <Image name="img" value="$image"></Image>
      <RectangleLabels name="tag" toName="img">
        <Label value="Hello"></Label>
        <Label value="World"></Label>
      </RectangleLabels>
    </View>
  `,
  interfaces: [
    "panel",
    "update",
    "controls",
    "side-column",
    "annotations:menu",
    "annotations:add-new",
    "annotations:delete",
    "predictions:menu"
  ],
  user: {
    pk: 1,
    firstName: "James",
    lastName: "Dean"
  },
  task: {
    annotations: [],
    predictions: [],
    id: 1,
    data: {
      image: "https://htx-pub.s3.us-east-1.amazonaws.com/examples/images/nick-owuor-astro-nic-visuals-wDifg5xc9Z4-unsplash.jpg"
    }
  }
});

labelStudio.on("labelStudioLoad", (LS) => {
  // Perform an action when Label Studio is loaded
  const c = LS.annotationStore.addAnnotation({
    userGenerate: true
  });
  LS.annotationStore.selectAnnotation(c.id);
});

labelStudio.on("submitAnnotation", (LS, annotation) => {
  // Retrieve an annotation in JSON format
  console.log(annotation.serializeAnnotation())
});

This technique is useful if you’re not using a bundler or if you want to use the LSF in a static HTML page.

<!-- Include Label Studio stylesheet -->
<link href="https://unpkg.com/heartexlabs@label-studio@latest/build/static/css/main.css" rel="stylesheet">

<div id="label-studio"></div>

<!-- Include the Label Studio library -->
<script src="https://unpkg.com/heartexlabs@label-studio@latest/build/static/js/main.js"></script>

<script>
const root = document.querySelector('#label-studio');
const labelStudio = new LabelStudio(root, {
  // all configuration options are the same
});
</script>

Prepare new custom component:

// components/LabelStudio.js
import {useRef} from 'react';

const LabelStudioReact = (props) => {
  const labelStudioContainerRef = useRef();
  const labelStudioRef = useRef();

  useEffect(() => {
    if (labelStudioContainerRef.current) {
      labelStudioRef.current = new LabelStudio(
        labelStudioContainerRef.current,
        props
      );
    }
  }, []);

  return (
    <div
      id="label-studio"
      ref={function(el) {
        labelStudioContainerRef.current = el
      }}
    />
  );
}

Use the component in your React application

// App.js
import { render } from 'react-dom';
import LabelStudioReact from './components/LabelStudio';

const labelinConfig = `
  <View>
    <Image name="img" value="$image"></Image>
    <RectangleLabels name="tag" toName="img">
      <Label value="Hello"></Label>
      <Label value="World"></Label>
    </RectangleLabels>
  </View>
`

const task = {
  annotations: [],
  predictions: [],
  id: 1,
  data: {
    image: "https://htx-pub.s3.us-east-1.amazonaws.com/examples/images/nick-owuor-astro-nic-visuals-wDifg5xc9Z4-unsplash.jpg"
  }
}

const App = () => {
  return (
    <div class="app-root">
      <LabelStudioReact
        config={labelinConfig}
        task={task}
        interfaces={[
          "panel",
          "update",
          "controls",
          "side-column",
          "annotations:menu",
          "annotations:add-new",
          "annotations:delete",
          "predictions:menu"
        ]}
        user={{
          pk: 1,
          firstName: "James",
          lastName: "Dean"
        }}
      />
    </div>
  )
}

render(<App />, document.getElementById('root'));