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+function colIdxToLetter(n) {
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+ let s = "";
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+ n = n + 1;
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+ while (n > 0) {
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+ const m = (n - 1) % 26;
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+ s = String.fromCharCode(65 + m) + s;
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+ n = Math.floor((n - m) / 26);
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+ }
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+ return s;
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+}
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+
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+function escapeXmlText(txt) {
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+ return String(txt ?? "")
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+ .replace(/&/g, "&")
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+ .replace(/</g, "<")
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+ .replace(/>/g, ">");
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+}
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+
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+function readCellText($cell, sheet, xlsx) {
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+ const t = $cell.attr("t");
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+ if (t === "inlineStr") {
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+ const tNode = $cell.find("is t");
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+ return tNode.length ? tNode.text() : "";
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+ }
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+ if (t === "s") {
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+ const v = $cell.find("v").text();
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+ const idx = parseInt(v, 10);
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+ const sst = xlsx.xl["sharedStrings.xml"];
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+ if (!sst) return "";
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+ const si = $("sst si", sst).eq(idx);
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+ if (!si.length) return "";
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+
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+ let out = "";
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+ si.find("t").each(function () {
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+ out += $(this).text();
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+ });
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+ return out;
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+ }
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+
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+ const vNode = $cell.find("v");
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+ return vNode.length ? vNode.text() : "";
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+}
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+
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+function newexportaction(e, dt, button, config, cb) {
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+ const self = this;
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+ const settings = dt.settings()[0];
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+ const isServerSide = settings.oFeatures && settings.oFeatures.bServerSide;
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+ const hasAjax = !!settings.ajax;
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+
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+ const customizeHeaderExcel = function (xlsx) {
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+ const sheet = xlsx.xl.worksheets["sheet1.xml"];
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+ const styles = xlsx.xl["styles.xml"];
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+
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+ // --- crea background azzurro ---
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+ const fills = $("fills", styles);
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+ fills.append(
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+ '<fill><patternFill patternType="solid">' +
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+ '<fgColor rgb="FFDDEBF7"/><bgColor indexed="64"/>' +
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+ "</patternFill></fill>"
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+ );
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+ const fillId = $("fill", styles).length - 1;
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+ fills.attr("count", $("fill", styles).length); // aggiorna count
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+
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+ // --- crea FONT bold nero ---
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+ const fonts = $("fonts", styles);
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+ fonts.append(
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+ '<font><b/><sz val="11"/><color rgb="FF000000"/><name val="Calibri"/></font>'
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+ );
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+ const fontId = $("font", styles).length - 1;
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+ fonts.attr("count", $("font", styles).length); // aggiorna count
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+
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+ // --- crea XF senza bordi, bold + fill azzurro ---
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+ const cellXfs = $("cellXfs", styles);
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+ cellXfs.append(
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+ `<xf xfId="0" applyFont="1" applyFill="1" borderId="0" fontId="${fontId}" fillId="${fillId}">
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+ <alignment vertical="center"/>
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+ </xf>`
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+ );
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+ const xfId = $("cellXfs xf", styles).length - 1;
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+ cellXfs.attr("count", $("cellXfs xf", styles).length); // aggiorna count
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+
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+ // --- applica lo stile alla PRIMA riga (header) ---
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+ $("row:first c", sheet).attr("s", xfId);
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+ };
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+
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+ const alignLeftCells = function (xlsx, config) {
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+ let leftCols = Array.isArray(config.exportLeftCols)
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+ ? [...config.exportLeftCols]
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+ : [];
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+ if (leftCols.length === 0 && dt && dt.columns) {
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+ const headerIdxs = [];
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+ $(dt.columns().header()).each(function (i, th) {
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+ if ($(th).hasClass("export-left")) headerIdxs.push(i);
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+ });
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+ leftCols = headerIdxs;
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+ }
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+
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+ if (leftCols.length) {
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+ const sheet = xlsx.xl.worksheets["sheet1.xml"];
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+ const styles = xlsx.xl["styles.xml"];
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+
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+ const cellXfs = $("cellXfs", styles);
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+ cellXfs.append(
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+ `<xf xfId="0" applyAlignment="1">
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+ <alignment horizontal="left" vertical="center"/>
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+ </xf>`
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+ );
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+ const leftXfId = $("cellXfs xf", styles).length - 1;
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+ cellXfs.attr("count", $("cellXfs xf", styles).length);
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+
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+ leftCols.forEach(function (colIdx) {
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+ const colLetter = colIdxToLetter(colIdx);
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+
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+ $('row:not(:first) c[r^="' + colLetter + '"]', sheet).each(
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+ function () {
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+ const cell = $(this);
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+ const sAttr = cell.attr("s");
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+ if (sAttr === undefined) {
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+ cell.attr("s", leftXfId);
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+ } else {
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+ const xfs = $("cellXfs xf", styles);
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+ const baseXf = xfs.eq(parseInt(sAttr, 10)).clone();
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+ if (baseXf.find("alignment").length === 0) {
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+ baseXf.append(
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+ '<alignment horizontal="left" vertical="center"/>'
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+ );
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+ } else {
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+ baseXf
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+ .find("alignment")
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+ .attr("horizontal", "left")
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+ .attr("vertical", "center");
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+ }
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+ cellXfs.append(baseXf);
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+
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+ const newId = $("cellXfs xf", styles).length - 1;
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+ cellXfs.attr(
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+ "count",
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+ $("cellXfs xf", styles).length
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+ );
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+ cell.attr("s", newId);
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+ }
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+ }
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+ );
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+ });
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+ }
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+ };
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+
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+ const forceAllCellsAsText = function (xlsx) {
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+ const sheet = xlsx.xl.worksheets["sheet1.xml"];
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+ if (!sheet) return;
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+
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+ $("worksheet sheetData row c", sheet).each(function () {
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+ const $cell = $(this);
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+ const text = readCellText($cell, sheet, xlsx);
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+ // sostituisco contenuto con inline string
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+ $cell.attr("t", "inlineStr");
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+ $cell.find("v").remove();
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+ $cell.find("is").remove();
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+ const safe = escapeXmlText(text);
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+ $cell.append(`<is><t>${safe}</t></is>`);
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+ // NON tocco l’attributo 's' (stile) se già esiste
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+ });
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+ };
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+
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+ // --- CLIENT-SIDE ---
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+ if (!isServerSide || !hasAjax) {
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+ // Esporta tutte le righe lato client
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+ const origExportOptions = config.exportOptions
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+ ? { ...config.exportOptions }
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+ : {};
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+ config.exportOptions = config.exportOptions || {};
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+ config.exportOptions.modifier = {
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+ ...(config.exportOptions.modifier || {}),
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+ page: "all",
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+ };
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+
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+ // PDF: tabella full-width
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+ // const isPdf = button[0].className.indexOf('buttons-pdf') >= 0;
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+ // const origCustomize = config.customize;
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+ // if (isPdf) {
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+ // config.customize = function(doc) {
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+ // const table = doc.content[1] && doc.content[1].table ? doc.content[1].table : null;
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+ // if (table && table.body && table.body[0]) {
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+ // table.widths = Array(table.body[0].length).fill('*');
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+ // }
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+ // if (typeof origCustomize === 'function') origCustomize(doc);
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+ // };
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+ // }
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+
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+ const cls = button[0].className;
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+
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+ if (cls.includes("buttons-copy")) {
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+ $.fn.dataTable.ext.buttons.copyHtml5.action.call(
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+ self,
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+ e,
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+ dt,
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+ button,
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+ config,
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+ cb
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+ );
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+ } else if (cls.includes("buttons-excel")) {
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+ const origCustomize = config.customize;
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+ config.filename = config.title;
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+ config.title = null;
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+ config.customize = function (xlsx) {
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+ if (typeof origCustomize === "function") origCustomize(xlsx);
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+ customizeHeaderExcel(xlsx);
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+ alignLeftCells(xlsx, config);
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+ forceAllCellsAsText(xlsx);
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+ };
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+
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+ ($.fn.dataTable.ext.buttons.excelHtml5.available(dt, config)
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+ ? $.fn.dataTable.ext.buttons.excelHtml5
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+ : $.fn.dataTable.ext.buttons.excelFlash
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+ ).action.call(self, e, dt, button, config, cb);
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+
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+ config.customize = origCustomize; // ripristina
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+ } else if (cls.includes("buttons-csv")) {
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+ ($.fn.dataTable.ext.buttons.csvHtml5.available(dt, config)
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+ ? $.fn.dataTable.ext.buttons.csvHtml5
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+ : $.fn.dataTable.ext.buttons.csvFlash
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+ ).action.call(self, e, dt, button, config, cb);
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+ } else if (cls.includes("buttons-pdf")) {
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+ ($.fn.dataTable.ext.buttons.pdfHtml5.available(dt, config)
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+ ? $.fn.dataTable.ext.buttons.pdfHtml5
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+ : $.fn.dataTable.ext.buttons.pdfFlash
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+ ).action.call(self, e, dt, button, config, cb);
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+ } else if (cls.includes("buttons-print")) {
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+ $.fn.dataTable.ext.buttons.print.action.call(
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+ self,
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+ e,
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+ dt,
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+ button,
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+ config,
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+ cb
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+ );
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+ }
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+
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+ // Ripristina config
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+ config.exportOptions = origExportOptions;
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+ // if (isPdf) config.customize = origCustomize;
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+
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+ if (typeof cb === "function") cb();
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+ return;
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+ }
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+
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+ // --- SERVER-SIDE + AJAX: fetch completo poi export ---
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+ const info = dt.page.info();
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+ const oldStart = info.start;
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+ const oldLength = info.length;
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+ const targetLength = info.recordsTotal > 0 ? info.recordsTotal : 2147483647;
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+
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+ dt.one("preXhr", function (e2, s, data) {
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+ data.start = 0;
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+ data.length = targetLength;
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+
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+ dt.one("preDraw", function (e3, stg) {
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+ const cls = button[0].className;
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+
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+ if (cls.includes("buttons-copy")) {
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+ $.fn.dataTable.ext.buttons.copyHtml5.action.call(
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+ self,
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+ e,
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+ dt,
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+ button,
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+ config,
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+ cb
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+ );
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+ } else if (cls.includes("buttons-excel")) {
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+ const origCustomize = config.customize;
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+ config.filename = config.title;
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+ config.title = null;
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+ config.customize = function (xlsx) {
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+ if (typeof origCustomize === "function")
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+ origCustomize(xlsx);
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+ customizeHeaderExcel(xlsx);
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+ alignLeftCells(xlsx, config);
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+ forceAllCellsAsText(xlsx);
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+ };
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+
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+ ($.fn.dataTable.ext.buttons.excelHtml5.available(dt, config)
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+ ? $.fn.dataTable.ext.buttons.excelHtml5
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+ : $.fn.dataTable.ext.buttons.excelFlash
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+ ).action.call(self, e, dt, button, config, cb);
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+
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+ config.customize = origCustomize;
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+ } else if (cls.includes("buttons-csv")) {
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+ ($.fn.dataTable.ext.buttons.csvHtml5.available(dt, config)
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+ ? $.fn.dataTable.ext.buttons.csvHtml5
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+ : $.fn.dataTable.ext.buttons.csvFlash
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+ ).action.call(self, e, dt, button, config, cb);
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+ } else if (cls.includes("buttons-pdf")) {
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+ // Full-width PDF
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+ // const origCustomize = config.customize;
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+ // config.customize = function(doc) {
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+ // const t = doc.content[1] && doc.content[1].table ? doc.content[1].table : null;
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+ // if (t && t.body && t.body[0]) t.widths = Array(t.body[0].length).fill('*');
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+ // if (typeof origCustomize === 'function') origCustomize(doc);
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+ // };
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+ ($.fn.dataTable.ext.buttons.pdfHtml5.available(dt, config)
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+ ? $.fn.dataTable.ext.buttons.pdfHtml5
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+ : $.fn.dataTable.ext.buttons.pdfFlash
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+ ).action.call(self, e, dt, button, config, cb);
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+ // config.customize = origCustomize;
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+ } else if (cls.includes("buttons-print")) {
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+ $.fn.dataTable.ext.buttons.print.action.call(
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+ self,
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+ e,
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+ dt,
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+ button,
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+ config,
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+ cb
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+ );
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+ }
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+
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+ dt.one("preXhr", function (e4, s2, data2) {
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+ data2.start = oldStart;
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+ data2.length = oldLength;
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+ stg._iDisplayStart = oldStart;
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+ });
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+
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+ setTimeout(() => {
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+ dt.ajax.reload(() => {
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+ if (typeof cb === "function") cb();
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+ }, false);
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+ }, 0);
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+
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+ return false;
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+ });
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+ });
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+
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+ dt.ajax.reload();
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+}
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