map colums to headers in excel datatables export. Fixes...

map colums to headers in excel datatables export. Fixes #999

templates/Registry/Conformite_traitement/list.html.twig

@@ -175,7 +175,7 @@
 
     {% set dataTableOptions = {
         columns: cols,
-        excludeId : true,
+        excludeId : false,
         order:  [
             [1, 'asc' ]
         ],

templates/_Utils/_serverside_datatable_base.html.twig

@@ -139,6 +139,7 @@
                 async: false
             });
             var exportBody = jsonResult.responseJSON.data;
+
             var colNames = params.columns.map(function(c) { return c.data }).filter(i => i !== 'actions')
             return exportBody.map(function (el) {
                 return colNames.map(function (key) {
@@ -154,18 +155,27 @@
                 var visible = api.columns().visible();
 
                 var params = api.ajax.params();
+                var headers = []
                 params.columns = params.columns.filter(function(c, i) {
-                    return visible[i] && c.data !== 'actions'
+                    var ret = visible[i] && c.data !== 'actions'
+                    if (options.excludeId) {
+                        ret = ret && c.data !== "id"
+                    }
+                    if (ret) {
+                        headers.push(api.columns().header()[i].textContent)
+                    }
+                    return ret;
                 })
-                if (options.excludeId) {
-                    params.columns = params.columns.filter( (c) => c.data !== "id")
-                }
 
                 var exportBody = getFullData(params);
 
                 d.body = [];
                 d.body.length = 0;
                 d.body.push.apply(d.body, exportBody);
+
+                d.header = [];
+                d.header.length = 0;
+                d.header.push.apply(d.header, headers);
             })
         } catch { }