From 6fbb49d74e7d77148d57d5c8c9619ccced42c625 Mon Sep 17 00:00:00 2001
From: leigh-mil <leigh-ctr@friends.dds.mil>
Date: Wed, 23 Jan 2019 10:58:13 -0500
Subject: [PATCH] Add event listener for focus so elements hidden behind the
 footer will scroll to the center of the screen

---
 js/index.js        | 11 +++++++++++
 js/lib/viewport.js | 15 +++++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 js/lib/viewport.js

diff --git a/js/index.js b/js/index.js
index 455c89d7..68b6a6e4 100644
--- a/js/index.js
+++ b/js/index.js
@@ -1,5 +1,7 @@
 import 'svg-innerhtml'
 import 'babel-polyfill'
+import ally from 'ally.js'
+
 
 import classes from '../styles/atat.scss'
 import Vue from 'vue/dist/vue'
@@ -28,6 +30,7 @@ import MembersList from './components/members_list'
 import LocalDatetime from './components/local_datetime'
 import RequestsList from './components/requests_list'
 import ConfirmationPopover from './components/confirmation_popover'
+import {isNotInVerticalViewport} from './lib/viewport'
 
 Vue.config.productionTip = false
 
@@ -77,6 +80,14 @@ const app = new Vue({
       const modal = modalOpen.getAttribute("data-modal")
       this.openModal(modal)
     }
+
+    ally.query.focusable().forEach( function(el) {
+      el.addEventListener('focus', function(){
+        if (isNotInVerticalViewport(el)) {
+          el.scrollIntoView({block: 'center'})
+        }
+      })
+    })
   },
   delimiters: ['!{', '}']
 })
diff --git a/js/lib/viewport.js b/js/lib/viewport.js
new file mode 100644
index 00000000..afe5aa8d
--- /dev/null
+++ b/js/lib/viewport.js
@@ -0,0 +1,15 @@
+export const isNotInVerticalViewport = (el) => {
+  const bounds = el.getBoundingClientRect()
+
+  if (bounds.top < 0) {
+    return true
+  }
+
+  if (bounds.bottom > ((window.innerHeight - 50))) {
+    // 50 is a magic number to offset for the sticky footer
+    // see variables.scss for $footer-height
+    return true
+  }
+
+  return false
+}