What are the differences between using the open prop and conditionally rendering a Material-UI Modal component?

Is there a difference in using the open prop or conditionally rendering Material-UI's Modal component and its built components? The closing transition may be lost, but are there any performance advantages when dealing with multiple Modals?

Example with the open prop:

    const [openModal, setOpenModal] = React.useState(false);

    return (
        /* code to set openModal to true */
        <Modal open={openModal} onClose={() => setOpenModal(false)}>modal stuff here...</Modal>
    );

Example with conditional rendering:

    const [openModal, setOpenModal] = React.useState(false);

    return (
        /* code to set openModal to true */
        {
            openModal &&
                <Modal open onClose={() => setOpenModal(false)}>modal stuff here...</Modal>
        }
    );

Answer №1

Upon reviewing the source code of the Modal component here, it appears that the second approach may be less performant due to the amount of initialization and useEffects happening each time the Modal is conditionally rendered. This results in the modal being mounted again in the DOM every time it is rendered, leading to potential inefficiencies. In my opinion, it would be more efficient to keep the open state controlled by the modal itself to prevent unnecessary mounting and re-rendering.

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