JS tweaks for showing messages (#60)

src/admin-theme/wwwroot/admin.js

@@ -413,6 +413,7 @@ this.Admin = {
       toast.setAttribute("role", "alert")
       toast.setAttribute("aria-live", "assertive")
       toast.setAttribute("aria-atomic", "true")
+      toast.setAttribute("data-mwl-shown", "true")
       toast.appendChild(toastHead)
       toast.appendChild(toastBody)
 
@@ -430,15 +431,14 @@ this.Admin = {
    * Initialize any toasts that were pre-rendered from the server
    */
   showPreRenderedMessages() {
-    [...document.querySelectorAll(".toast")].forEach(el => {
-      if (el.getAttribute("data-mwl-shown") !== "true") {
+    [...document.querySelectorAll(".toast")]
+      .filter(el => !el.hasAttribute("data-mwl-shown"))
+      .forEach(el => {
         const toast = new bootstrap.Toast(el,
-            el.getAttribute("data-bs-autohide") === "false"
-                ? { autohide: false } : { delay: 6000, autohide: true })
+            el.getAttribute("data-bs-autohide") === "false" ? { autohide: false } : { delay: 6000, autohide: true })
         toast.show()
         el.setAttribute("data-mwl-shown", "true")
-      }
-    })
+      })
   }
 }