Merge pull request #73 from mjlumetta/allow-focus-on-focusable-elements

Allow focus to remain on the targets of hash links when the target is focusable

README.md

@@ -104,3 +104,9 @@ const MyComponent = () => (
   </div>
 );
 ```
+
+## Focus Management
+
+`react-router-hash-link` attempts to recreate the native browser focusing behavior as closely as possible. For non-interactive elements, it calls `element.focus()` followed by `element.blur()` (using a temporary `tabindex` to ensure that the element can be focused programmatically) so that focus _moves_ to the target element but does not remain on it or trigger any style changes. For interactive elements, it calls `element.focus()` and leaves focus on the target element.
+
+If you would like to leave focus on a non-interactive element - for example, to augment the navigation interaction with a visual focus indicator - you can optionally set a `tabindex` on the target element. `react-router-hash-link` will respect the `tabindex` and leave focus on the target in that case.

src/index.js

@@ -16,6 +16,13 @@ function reset() {
   }
 }
 
+function isInteractiveElement(element) {
+  const formTags = ['BUTTON', 'INPUT', 'SELECT', 'TEXTAREA'];
+  const linkTags = ['A', 'AREA'];
+  return (formTags.includes(element.tagName) && !element.hasAttribute('disabled'))
+    || (linkTags.includes(element.tagName) && element.hasAttribute('href'));
+}
+
 function getElAndScroll() {
   let element = null;
   if (hashFragment === '#') {
@@ -43,11 +50,16 @@ function getElAndScroll() {
     let originalTabIndex = element.getAttribute('tabindex');
     if (originalTabIndex === null) element.setAttribute('tabindex', -1);
     element.focus({ preventScroll: true });
-    // for some reason calling blur() in safari resets the focus region to where it was previously,
-    // if blur() is not called it works in safari, but then are stuck with default focus styles
-    // on an element that otherwise might never had focus styles applied, so not an option
-    element.blur();
-    if (originalTabIndex === null) element.removeAttribute('tabindex');
+    if (originalTabIndex === null) {
+      if (!isInteractiveElement(element)) {
+        // for some reason calling blur() in safari resets the focus region to where it was previously,
+        // if blur() is not called it works in safari, but then are stuck with default focus styles
+        // on an element that otherwise might never had focus styles applied, so not an option
+        element.blur();
+      }
+
+      element.removeAttribute('tabindex');
+    }
 
     reset();
     return true;