Add quicklinks to hardware status page

- Renames SetFocusMixin to JumpLinkMixin to better describe what the
mixin is for: jump links like quick links and skip to main content
- Adds scrollToOffset method to JumpLinkMixin methods to scroll to
selected page elements
- Scroll offset is required to show table header below the nav header
- Setting focus is required for accessibility

Signed-off-by: Dixsie Wolmers <dixsie@ibm.com>
Change-Id: I500a2d70727c5a78aeae4a6193ba22a38e4f0b6f

1 files changed, 27 insertions, 0 deletions

diff --git a/src/components/Mixins/JumpLinkMixin.js b/src/components/Mixins/JumpLinkMixin.js
new file mode 100644
index 00000000..b038527b
--- /dev/null
+++ b/src/components/Mixins/JumpLinkMixin.js
@@ -0,0 +1,27 @@
+const JumpLinkMixin = {
+  methods: {
+    setFocus(element) {
+      element.setAttribute('tabindex', '-1');
+      element.focus();
+      // Reason: https://axesslab.com/skip-links/#update-3-a-comment-from-gov-uk
+      element.removeAttribute('tabindex');
+    },
+    scrollToOffset(event) {
+      // Select element to scroll to
+      const ref = event.target.getAttribute('data-ref');
+      const element = this.$refs[ref].$el;
+
+      // Set focus and tabindex on selected element
+      this.setFocus(element);
+
+      // Set scroll offset below header
+      const offset = element.offsetTop - 50;
+      window.scroll({
+        top: offset,
+        behavior: 'smooth',
+      });
+    },
+  },
+};
+
+export default JumpLinkMixin;