React class component convert to functional component (Antdesign) - reactjs

Question

I'm new to React and I want to use Antdesign for image upload, but the component class component given in ant design's site. How can I convert the code below into a functional component?
in what way can i do this? Or is there any online tool that can do this?
here is my code :
function getBase64(img, callback) {
const reader = new FileReader();
reader.addEventListener('load', () => callback(reader.result));
reader.readAsDataURL(img);
}
function beforeUpload(file) {
const isJpgOrPng = file.type === 'image/jpeg' || file.type === 'image/png';
if (!isJpgOrPng) {
message.error('You can only upload JPG/PNG file!');
}
const isLt2M = file.size / 1024 / 1024 < 2;
if (!isLt2M) {
message.error('Image must smaller than 2MB!');
}
return isJpgOrPng && isLt2M;
}
class Avatar extends React.Component {
state = {
loading: false,
};
handleChange = info => {
if (info.file.status === 'uploading') {
this.setState({ loading: true });
return;
}
if (info.file.status === 'done') {
// Get this url from response in real world.
getBase64(info.file.originFileObj, imageUrl =>
this.setState({
imageUrl,
loading: false,
}),
);
}
};
render() {
const { loading, imageUrl } = this.state;
const uploadButton = (
<div>
{loading ? <LoadingOutlined /> : <PlusOutlined />}
<div style={{ marginTop: 8 }}>Upload</div>
</div>
);
return (
<Upload
name="avatar"
listType="picture-card"
className="avatar-uploader"
showUploadList={false}
action="https://www.mocky.io/v2/5cc8019d300000980a055e76"
beforeUpload={beforeUpload}
onChange={this.handleChange}
>
{imageUrl ? <img src={imageUrl} alt="avatar" style={{ width: '100%' }} /> : uploadButton}
</Upload>
);
}
}
ReactDOM.render(<Avatar />, mountNode);

Answer 1

You will need to replace your class with a function that returns a JSX element.
You'll need to refactor your state to use the useState hook: https://reactjs.org/docs/hooks-state.html
DigitalOcean has a nice guide here: https://www.digitalocean.com/community/tutorials/five-ways-to-convert-react-class-components-to-functional-components-with-react-hooks
It will end up looking something like the following:
function getBase64(img, callback) {
const reader = new FileReader();
reader.addEventListener("load", () => callback(reader.result));
reader.readAsDataURL(img);
}
function beforeUpload(file) {
const isJpgOrPng = file.type === "image/jpeg" || file.type === "image/png";
if (!isJpgOrPng) {
message.error("You can only upload JPG/PNG file!");
}
const isLt2M = file.size / 1024 / 1024 < 2;
if (!isLt2M) {
message.error("Image must smaller than 2MB!");
}
return isJpgOrPng && isLt2M;
}
function Avatar() {
const [imageUrl, setImageUrl] = useState(null);
const [loading, setLoading] = useState(false);
const handleChange = (info) => {
if (info.file.status === "uploading") {
setLoading(true)
return;
}
if (info.file.status === "done") {
// Get this url from response in real world.
getBase64(info.file.originFileObj, (imageUrl) => {
setImageUrl(imageUrl);
setLoading(false);
});
}
};
const uploadButton = (
<div>
{loading ? <LoadingOutlined /> : <PlusOutlined />}
<div style={{ marginTop: 8 }}>Upload</div>
</div>
);
return (
<Upload
name="avatar"
listType="picture-card"
className="avatar-uploader"
showUploadList={false}
action="https://www.mocky.io/v2/5cc8019d300000980a055e76"
beforeUpload={beforeUpload}
onChange={handleChange}
>
{imageUrl ? (
<img src={imageUrl} alt="avatar" style={{ width: "100%" }} />
) : (
uploadButton
)}
</Upload>
);
};