By iPhoneJavaDev


2020-05-22 23:07:06 8 Comments

I have the following components:

const ParentComponent: React.FC = () => {
    // Somewhere in the code, I set this to some value
    const [newType, setNewType] = useState<any>(undefined);

    // Somewhere in the code, I set this to true
    const [enableAddEdge, setEnableAddEdge] = useState(false);

    const addEdge = (data: any) => {
        console.log("newType", newType); // This is undefined
    }

    return (
    ...
        <VisNetwork 
            newType={newType}
            onAddEdge={addEdge}
            enableAddEdge={enableAddEdge}
        />
    ...
    )
}
export default ParentComponent;

interface Props {
    newType: any;
    onAddEdge: (data: any) => void;
    enableAddEdge: boolean;
}
const VisNetwork: React.FC<Props> = (props: Props) => {
    const options: any = {
        // Some vis-network specific option configuration
        manipulation: {
            addEdge: (data: any, callback: any) => props.onAddEdge(data);
        }
    }
    ...
    // Some code to create the network and pass in the options
    const network = new vis.Network(container, networkData, options);

    useEffect(() => {
        if (props.enableAddEdge) {
            // This confirms that indeed newType has value
            console.log("newType from addEdge", props.newType);

            // Call reference to network (I name it currentNetwork)
            // This will enable the adding of edge in the network.  
            // When the user is done adding the edge,
            // the `addEdge` method in the `options.manipulation` will be called.
            currentNetwork.addEdgeMode();
        }
    }, [props.enableAddEdge])

    useEffect(() => {
        if (props.newType) {
            // This is just to confirm that indeed I am setting the newType value
            console.log("newType from visNetwork", props.newType); // This has value
        }
    }, [props.newType]);
}
export default VisNetwork;

When the addEdge method is called, the newType state becomes undefined. I know about the bind but I don't know if it's possible to use it and how to use it in a functional component. Please advise on how to obtain the newType value.

Also, from VisNetwork, I want to access networkData state from inside options.manipulation.addEdge. I know it's not possible but any workaround? I also need to access the networkData at this point.

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