Submit value propagation fix

Pages/Demos/SubmitButton.cshtml

@@ -11,7 +11,7 @@
     <form method="post">
         <div class="form-field">
             <p>
-                This simple test demonstrates that we ensure that submit buttons.
+                This simple test demonstrates that we ensure that submit button values are submitted.
             </p>
 
             <input type="submit" asp-for="SubmitButtonValue" value="Input Type Submit" />

Pages/Demos/SubmitButtonDownload.cshtml

@@ -0,0 +1,33 @@
+@page
+@model DemoWeb.Pages.Demos.SubmitButtonDownload
+
+@{
+    Layout = "Shared/_Layout";
+}
+
+<fieldset>
+    <legend>Required ASP.NET Checkboxes with hidden input</legend>
+
+    @DateTime.UtcNow
+
+    <form method="post">
+        <div class="form-field">
+            <p>
+                This simple test demonstrates that we ensure that submit button values are submitted
+                correctly even when the form is posting to a download (and the page is not refreshed).
+            </p>
+
+            Required: <input asp-for="SomeRequiredValue" />
+
+            <input type="submit" asp-for="SubmitButtonValue" value="PDF" />
+            <input type="submit" asp-for="SubmitButtonValue" value="Excel" />
+        </div>
+    </form>
+</fieldset>
+
+@section Scripts {
+    <script>
+        const service = new aspnetValidation.ValidationService(console);
+        service.bootstrap();
+    </script>
+}

Pages/Demos/SubmitButtonDownload.cshtml.cs

@@ -0,0 +1,21 @@
+using System.ComponentModel.DataAnnotations;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+
+namespace DemoWeb.Pages.Demos;
+
+public class SubmitButtonDownload : PageModel
+{
+    [BindProperty]
+    [Required]
+    public string? SubmitButtonValue { get; set; }
+
+    [BindProperty]
+    [Required]
+    public string? SomeRequiredValue { get; set; }
+
+    public IActionResult OnPost()
+    {
+        return File([0], "application/octet-stream", $"DEMO-{SubmitButtonValue}.txt");
+    }
+}

Pages/Index.cshtml

@@ -8,6 +8,7 @@
 <ul>
     <li><a asp-page="Demos/Checkboxes">Checkboxes and Radio Buttons</a></li>
     <li><a asp-page="Demos/SubmitButton">Submit Button</a></li>
+    <li><a asp-page="Demos/SubmitButtonDownload">Submit Button with Download</a></li>
     <li><a asp-page="Demos/RemovedInputs">Removed Inputs</a></li>
     <li><a asp-page="Demos/SelectInput">Select Input and Validation Summary</a></li>
     <li><a asp-page="Demos/FormAction">Form Action</a></li>

dist/aspnet-validation.js

@@ -599,12 +599,13 @@ var ValidationService = /** @class */ (function () {
                 // Because the submitter is not propagated when calling
                 // form.submit(), we recreate it here.
                 var submitter = submitEvent.submitter;
+                var submitterInput = null;
                 var initialFormAction = form.action;
                 if (submitter) {
                     var name_1 = submitter.getAttribute('name');
                     // If name is null, a submit button is not submitted.
                     if (name_1) {
-                        var submitterInput = document.createElement('input');
+                        submitterInput = document.createElement('input');
                         submitterInput.type = 'hidden';
                         submitterInput.name = name_1;
                         submitterInput.value = submitter.getAttribute('value');
@@ -619,6 +620,10 @@ var ValidationService = /** @class */ (function () {
                     form.submit();
                 }
                 finally {
+                    if (submitterInput) {
+                        // Important to clean up the submit input we created.
+                        form.removeChild(submitterInput);
+                    }
                     form.action = initialFormAction;
                 }
             }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "aspnet-client-validation",
-  "version": "0.10.1",
+  "version": "0.10.2",
   "description": "Enables ASP.NET MVC client-side validation, without jQuery!",
   "main": "dist/aspnet-validation.js",
   "style": "dist/aspnet-validation.css",

src/index.ts

@@ -804,12 +804,13 @@ export class ValidationService {
             // Because the submitter is not propagated when calling
             // form.submit(), we recreate it here.
             const submitter = submitEvent.submitter;
+            let submitterInput: HTMLInputElement | null = null;
             const initialFormAction = form.action;
             if (submitter) {
                 const name = submitter.getAttribute('name');
                 // If name is null, a submit button is not submitted.
                 if (name) {
-                    const submitterInput = document.createElement('input');
+                    submitterInput = document.createElement('input');
                     submitterInput.type = 'hidden';
                     submitterInput.name = name;
                     submitterInput.value = submitter.getAttribute('value');
@@ -825,6 +826,10 @@ export class ValidationService {
             try {
                 form.submit();
             } finally {
+                if (submitterInput) {
+                    // Important to clean up the submit input we created.
+                    form.removeChild(submitterInput);
+                }
                 form.action = initialFormAction;
             }
         }