Add for-route attribute to <button> as an alternative to asp-page-han…

…dler

src/Demo/SafeRouting.Demo/Pages/Edit.cshtml

@@ -5,6 +5,7 @@
 @{
   var controllerRoute = Routes.Controllers.Product.Search("chair", 10);
   var pageRoute = Routes.Pages.Edit.Post(Model.Id);
+  var pageHandlerRoute = Routes.Pages.Product.PostDelete();
 }
 
 <!-- Adds the URL in the href attribute -->
@@ -16,4 +17,9 @@
 <!-- Adds the URL in the action attribute -->
 <form for-route="pageRoute" method="post"></form>
 
+<!-- Adds the URL in the button's formaction attribute -->
+<form method="post">
+  <button type="submit" for-route="pageHandlerRoute">Delete</button>
+</form>
+
 @{ #endregion }

src/Demo/SafeRouting.Demo/Pages/Product.cshtml.cs

@@ -10,4 +10,6 @@ public void OnGet() { }
   public IActionResult OnGetRedirectToController() => Routes.Controllers.Account.Index().Redirect(this);
 
   public IActionResult OnGetRedirectToPage() => Routes.Pages.Index.Get().Redirect(this);
+
+  public void OnPostDelete() { }
 }

src/README.source.md

@@ -43,7 +43,7 @@ To enable the included tag helpers, add the following line to `_ViewImports.csht
 
 <region:ViewImports>
 
-This enables `for-route` attributes to be added to `<a>`, `<img>`, and `<form>` elements, for example:
+This enables `for-route` attributes to be added to `<a>`, `<button>`, `<img>`, and `<form>` elements, for example:
 
 <region:CshtmlExample>
 

src/SafeRouting.Common/TagHelpers.cs

@@ -11,6 +11,7 @@ namespace SafeRouting.TagHelpers;
 /// <see cref="ITagHelper"/> implementation targeting <c>&lt;a&gt;</c>, <c>&lt;form&gt;</c>, or <c>&lt;img&gt;</c> elements.
 /// </summary>
 [HtmlTargetElement(AnchorTagName, Attributes = ForRouteAttributeName)]
+[HtmlTargetElement(ButtonTagName, Attributes = ForRouteAttributeName)]
 [HtmlTargetElement(FormTagName, Attributes = ForRouteAttributeName)]
 [HtmlTargetElement(ImageTagName, Attributes = ForRouteAttributeName)]
 public sealed class RouteValuesTagHelper : TagHelper
@@ -43,6 +44,7 @@ public override void Process(TagHelperContext context, TagHelperOutput output)
     var urlAttributeName = context.TagName switch
     {
       AnchorTagName => AnchorAttributeName,
+      ButtonTagName => ButtonAttributeName,
       FormTagName => FormAttributeName,
       ImageTagName => ImageAttributeName,
       _ => null
@@ -65,6 +67,8 @@ public override void Process(TagHelperContext context, TagHelperOutput output)
   private const string ForRouteAttributeName = "for-route";
   private const string AnchorTagName = "a";
   private const string AnchorAttributeName = "href";
+  private const string ButtonTagName = "button";
+  private const string ButtonAttributeName = "formaction";
   private const string FormTagName = "form";
   private const string FormAttributeName = "action";
   private const string ImageTagName = "img";