véritable gestion de l'historique de datatable pour les structures

<script>

    let loaded = false;

    let search ;

    let page ;

    $(document).ready(function() {

        var table = $('#structures').DataTable({

            "paging": false

    $(window).bind('beforeunload', function() {

        let params = '';

        if (search !== null && search !== undefined) {

            params += "search=" + search;

        }

        if (page !== null && page !== undefined)   {

            if (params !== '') params += "&";

            params += "page=" + page;

        }

        if (params !== '') {

            console.log("params : " + params);

            history.replaceState({}, null, '?' + params);

        }

    });

    $(document).ready(function() {

        let table = $('#structures').DataTable({});

        let searchParams = new URLSearchParams(window.location.search);

        let param = searchParams.get('search')

        if (param !== null) {

            table.search(param);

            table.draw();

        let search = searchParams.get('search')

        let page = searchParams.get('page')

        if (/** search !== undefined && search !== "undefined" &&*/ search !== null && search !== "null") {

            table.search(search);

        }

        if (/**page !== undefined && page !== "undefined" &&*/ page !== null && page !== "null") {

            table.page(parseInt(page));

        }

        table.draw(false);

        loaded = true;

    });

    $(document).on('search.dt', function () {

    $(document).on('#structures page.dt', function () {

        if (loaded === true) {

            let table  = $('#structures').DataTable();

            page   = table.page();

            console.log(page);

        }

    });

    $(document).on('#structures search.dt', function () {

        if (loaded === true) {

            let valeur = $('input').val();

            console.log(valeur);

            history.replaceState({}, null, '?search=' + valeur);

            let table = $('#structures').DataTable();

            search = table.search();

            console.log(search);

        }

    });

    // NB : il existe aussi un event order.dt

    $(function() {

        $("body").on("modification", function (event) {

            event.div.modal('hide');