Returns the document language.
This method doesn't have any parameters.
window.Asc.plugin.executeMethod("GetDocumentLang", [], function(lang) { let documentLang = lang || defaultLang; let aOptions = Array.from($('#custom_menu option')); let oDefaultOption = aOptions.find(function(item) { if (item.value == defaultLang) return item; }); let oMatchOption = undefined; oMatchOption = aOptions.find(function(item) { if (item.value == documentLang) return true; }); if (!oMatchOption) { oMatchOption = aOptions.find(function(item) { if (item.value.search(documentLang.split('-')[0]) != -1) return true; }); } if (!oMatchOption) oMatchOption = oDefaultOption; if (oMatchOption) { $('#custom_menu').val(oMatchOption.value); $('#custom_menu').trigger('change'); } });