Improved DtParameters Binding when exporting to file

Author: DavidSuescunPelegay

src/jQueryDatatableServerSideNetCore/Controllers/TestRegistersController.cs

@@ -81,14 +81,12 @@ public async Task<IActionResult> LoadTable([FromBody] DtParameters dtParameters)
         }
 
         [HttpPost]
-        public async Task<IActionResult> ExportTable([FromQuery] string format)
+        public async Task<IActionResult> ExportTable([FromQuery] string format, [FromForm] string dtParametersJson)
         {
-            var rawDtParametersData = HttpContext.Request.Form["dtParameters"];
-
             var dtParameters = new DtParameters();
-            if (!string.IsNullOrEmpty(rawDtParametersData))
+            if (!string.IsNullOrEmpty(dtParametersJson))
             {
-                dtParameters = JsonConvert.DeserializeObject<DtParameters>(rawDtParametersData);
+                dtParameters = JsonConvert.DeserializeObject<DtParameters>(dtParametersJson);
             }
 
             var searchBy = dtParameters.Search?.Value;

src/jQueryDatatableServerSideNetCore/wwwroot/js/app.js

@@ -107,12 +107,13 @@ function renderDownloadForm(format) {
     // Get jQuery DataTables AJAX params
     var datatableParams = $('#test-registers').DataTable().ajax.params();
 
-    if ($("#export-to-file-form input[name=dtParameters]").val()) {
-        $('#export-to-file-form input[name=dtParameters]').val(datatableParams);
+    // If the input exists, replace value, if not create the input and append to form
+    if ($("#export-to-file-form input[name=dtParametersJson]").val()) {
+        $('#export-to-file-form input[name=dtParametersJson]').val(datatableParams);
     } else {
         var searchModelInput = $("<input>")
             .attr("type", "hidden")
-            .attr("name", "dtParameters")
+            .attr("name", "dtParametersJson")
             .val(datatableParams);
 
         $('#export-to-file-form').append(searchModelInput);