From c8e6d1813916577a0dc1b5b22c91de7aa53e8960 Mon Sep 17 00:00:00 2001
From: Greg Johnston <greg.johnston@gmail.com>
Date: Fri, 3 Mar 2023 10:44:15 -0500
Subject: [PATCH] feat: allow multiple class names in `view!` macro `class = `
 (closes #612) (#614)

---
 leptos_dom/src/html.rs                     | 11 +++++++++++
 leptos_dom/src/macro_helpers/into_class.rs |  9 +++++++--
 leptos_macro/src/view.rs                   |  5 ++++-
 3 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/leptos_dom/src/html.rs b/leptos_dom/src/html.rs
index c3e4981cf..990d9de52 100644
--- a/leptos_dom/src/html.rs
+++ b/leptos_dom/src/html.rs
@@ -576,6 +576,17 @@ impl<El: ElementDescriptor + 'static> HtmlElement<El> {
         }
     }
 
+    /// Adds a list of classes separated by ASCII whitespace to an element.
+    #[track_caller]
+    pub fn classes(self, classes: impl Into<Cow<'static, str>>) -> Self {
+        let classes = classes.into();
+        let mut this = self;
+        for class in classes.split_ascii_whitespace() {
+            this = this.class(class.to_string(), true);
+        }
+        this
+    }
+
     /// Sets a property on an element.
     #[track_caller]
     pub fn prop(
diff --git a/leptos_dom/src/macro_helpers/into_class.rs b/leptos_dom/src/macro_helpers/into_class.rs
index 344838013..a015bc544 100644
--- a/leptos_dom/src/macro_helpers/into_class.rs
+++ b/leptos_dom/src/macro_helpers/into_class.rs
@@ -107,10 +107,15 @@ pub(crate) fn class_expression(
 
     if force || !HydrationCtx::is_hydrating() {
         let class_name = wasm_bindgen::intern(class_name);
+
         if value {
-            class_list.add_1(class_name).unwrap_throw();
+            if let Err(e) = class_list.add_1(class_name) {
+                crate::error!("[HtmlElement::class()] {e:?}");
+            }
         } else {
-            class_list.remove_1(class_name).unwrap_throw();
+            if let Err(e) = class_list.remove_1(class_name) {
+                crate::error!("[HtmlElement::class()] {e:?}");
+            }
         }
     }
 }
diff --git a/leptos_macro/src/view.rs b/leptos_macro/src/view.rs
index 3c3ba4a29..5c15b6ff8 100644
--- a/leptos_macro/src/view.rs
+++ b/leptos_macro/src/view.rs
@@ -748,7 +748,10 @@ fn element_to_tokens(
             None => quote! {},
             Some(class) => {
                 quote! {
-                    .class(#class, true)
+                    .classes(
+                        #[allow(unused_braces)]
+                        #class
+                    )
                 }
             }
         };