From 42eeeb8e98c9edabd6b18e1bd75e7f43c15d45cc Mon Sep 17 00:00:00 2001
From: UseMuse <UseMuse@mail.ru>
Date: Fri, 14 Feb 2020 12:44:10 +0300
Subject: [PATCH] everything works as before, the flag "displayedDataOnly" was
 added, the default value of which is true - which means, unload only what is
 displayed on the screen, otherwise, unload all data

---
 .../Controllers/HomeController.cs             |  7 ++---
 AspNetCoreServerSide/wwwroot/js/app.js        | 26 +++++++++++++++++--
 2 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/AspNetCoreServerSide/Controllers/HomeController.cs b/AspNetCoreServerSide/Controllers/HomeController.cs
index d7f36e0..b46d4e6 100644
--- a/AspNetCoreServerSide/Controllers/HomeController.cs
+++ b/AspNetCoreServerSide/Controllers/HomeController.cs
@@ -78,11 +78,12 @@ public async Task<IActionResult> LoadTable([FromBody]JqueryDataTablesParameters
             }
         }
 
-        public async Task<IActionResult> GetExcel()
+        public async Task<IActionResult> GetExcel(bool displayedDataOnly)
         {
             var param = HttpContext.Session.GetString(nameof(JqueryDataTablesParameters));
-
-            var results = await _demoService.GetDataAsync(JsonSerializer.Deserialize<JqueryDataTablesParameters>(param));
+            var _param = JsonSerializer.Deserialize<JqueryDataTablesParameters>(param);
+            _param.Length = displayedDataOnly ? _param.Length  : -1;
+            var results = await _demoService.GetDataAsync(_param);
             return new JqueryDataTablesExcelResult<DemoExcel>(_mapper.Map<List<DemoExcel>>(results.Items), "Demo Sheet Name", "Fingers10");
         }
 
diff --git a/AspNetCoreServerSide/wwwroot/js/app.js b/AspNetCoreServerSide/wwwroot/js/app.js
index fde6c24..4c07208 100644
--- a/AspNetCoreServerSide/wwwroot/js/app.js
+++ b/AspNetCoreServerSide/wwwroot/js/app.js
@@ -97,14 +97,36 @@ $(() => {
             buttons: [
                 {
                     text: 'Export to Excel',
-                    className: 'btn btn-sm btn-dark',
+                    className: 'btn btn-sm btn-dark btn-export-excel',
                     action: function (e, dt, node, config) {
-                        window.location.href = "/Home/GetExcel";
+                        var t = e.target;
+                        var $checkbox = $('#displayedDataOnly');
+                        var displayedDataOnly = $checkbox.val();
+                        if (t.nodeName !== 'BUTTON') {
+                            e.preventDefault();
+                            if (displayedDataOnly === 'true') {
+                                $checkbox.prop("checked", false);
+                                displayedDataOnly = $checkbox.val('false');
+                            }
+                            else {
+                                $checkbox.prop("checked", true);
+                                displayedDataOnly = $checkbox.val('true');
+                            }
+
+                            return;
+                        }
+                        else
+                            window.location.href = `/Home/GetExcel?displayedDataOnly=${displayedDataOnly}`;
                     },
                     init: function (api, node, config) {
                         $(node).removeClass('dt-button');
+                        $(node).html(`Export to Excel <div class="form-check form-check-inline" style="display:inline-flex; margin:0;background: goldenrod;">
+  <input style="cursor: pointer;" class="form-check-input" type="checkbox" id="displayedDataOnly" value="true" checked="checked">
+  <label style="cursor: pointer;" class="form-check-label" for="displayedDataOnly">displayed data only</label>
+</div>`)
                     }
                 },
+
                 {
                     text: 'Create',
                     className: 'btn btn-sm btn-success',