From 95e5f36a484442ed1c0b45a7ab75084af2e26714 Mon Sep 17 00:00:00 2001
From: Jenni Nurmi <jenni@sharetribe.com>
Date: Thu, 22 Aug 2019 13:15:46 +0300
Subject: [PATCH] SavedCardDetails: use portal for modal

---
 public/index.html                             |  1 +
 .../SavedCardDetails/SavedCardDetails.js      | 90 ++++++++++++++-----
 2 files changed, 68 insertions(+), 23 deletions(-)
diff --git a/public/index.html b/public/index.html
index db42bf79..87366e37 100644
--- a/public/index.html
+++ b/public/index.html
@@ -88,6 +88,7 @@
   </head>
   <body>
     <div id="root"><!--!body--></div>
+    <div id="portal-root"></div>
     <script>
       (function(document){
         // Check if Promise exists in window
diff --git a/src/components/SavedCardDetails/SavedCardDetails.js b/src/components/SavedCardDetails/SavedCardDetails.js
index 65efa14c..64f461be 100644
--- a/src/components/SavedCardDetails/SavedCardDetails.js
+++ b/src/components/SavedCardDetails/SavedCardDetails.js
@@ -1,4 +1,5 @@
 import React, { useState } from 'react';
+import ReactDOM from 'react-dom';
 import { bool, func, number, shape, string } from 'prop-types';
 import classNames from 'classnames';
 import { injectIntl, intlShape } from 'react-intl';
@@ -20,10 +21,45 @@ import css from './SavedCardDetails.css';
 const DEFAULT_CARD = 'defaultCard';
 const REPLACE_CARD = 'replaceCard';
 
+// TODO: change all the modals to use portals at some point.
+// Portal is used here to circumvent the problems that rise
+// from different levels of z-indexes in DOM tree. In this case
+// either TopBar or Menu element were overlapping the modal due
+// to stacking context. All the modals should be made with portals
+// but portals didn't exist when we originally created modals.
+
+class Portal extends React.Component {
+  constructor(props) {
+    super(props);
+    this.el = document.createElement('div');
+  }
+
+  componentDidMount() {
+    // The portal element is inserted in the DOM tree after
+    // the Modal's children are mounted, meaning that children
+    // will be mounted on a detached DOM node. If a child
+    // component requires to be attached to the DOM tree
+    // immediately when mounted, for example to measure a
+    // DOM node, or uses 'autoFocus' in a descendant, add
+    // state to Modal and only render the children when Modal
+    // is inserted in the DOM tree.
+    this.props.portalRoot.appendChild(this.el);
+  }
+
+  componentWillUnmount() {
+    this.props.portalRoot.removeChild(this.el);
+  }
+
+  render() {
+    return ReactDOM.createPortal(this.props.children, this.el);
+  }
+}
+
 const SavedCardDetails = props => {
   const [isModalOpen, setIsModalOpen] = useState(false);
   const [menuOpen, setMenuOpen] = useState(false);
   const [active, setActive] = useState(DEFAULT_CARD);
+  const [portalRoot, setPortalRoot] = useState(null);
 
   const {
     rootClassName,
@@ -133,8 +169,11 @@ const SavedCardDetails = props => {
 
   const showExpired = isCardExpired && active === DEFAULT_CARD;
 
+  const setPortalRootAfterInitialRender = () => {
+    setPortalRoot(document.getElementById('portal-root'));
+  };
   return (
-    <div className={classes}>
+    <div className={classes} ref={setPortalRootAfterInitialRender}>
       <Menu className={css.menu} isOpen={menuOpen} onToggleActive={onToggleActive} useArrow={false}>
         <MenuLabel className={css.menuLabel}>
           <div className={showExpired ? css.menuLabelWrapperExpired : css.menuLabelWrapper}>
@@ -186,28 +225,32 @@ const SavedCardDetails = props => {
         </InlineTextButton>
       ) : null}
 
-      <Modal
-        id="VerifyDeletingPaymentMethod"
-        isOpen={isModalOpen}
-        onClose={() => {
-          setIsModalOpen(false);
-        }}
-        contentClassName={css.modalContent}
-        onManageDisableScrolling={onManageDisableScrolling}
-      >
-        <div>
-          <div className={css.modalTitle}>{removeCardModalTitle}</div>
-          <p className={css.modalMessage}>{removeCardModalContent}</p>
-          <div className={css.modalButtonsWrapper}>
-            <div onClick={() => setIsModalOpen(false)} className={css.cancelCardDelete}>
-              {cancel}
+      {portalRoot && onManageDisableScrolling ? (
+        <Portal portalRoot={portalRoot}>
+          <Modal
+            id="VerifyDeletingPaymentMethod"
+            isOpen={isModalOpen}
+            onClose={() => {
+              setIsModalOpen(false);
+            }}
+            contentClassName={css.modalContent}
+            onManageDisableScrolling={onManageDisableScrolling}
+          >
+            <div>
+              <div className={css.modalTitle}>{removeCardModalTitle}</div>
+              <p className={css.modalMessage}>{removeCardModalContent}</p>
+              <div className={css.modalButtonsWrapper}>
+                <div onClick={() => setIsModalOpen(false)} className={css.cancelCardDelete}>
+                  {cancel}
+                </div>
+                <Button onClick={onDeleteCard} inProgress={deletePaymentMethodInProgress}>
+                  {removeCard}
+                </Button>
+              </div>
             </div>
-            <Button onClick={onDeleteCard} inProgress={deletePaymentMethodInProgress}>
-              {removeCard}
-            </Button>
-          </div>
-        </div>
-      </Modal>
+          </Modal>
+        </Portal>
+      ) : null}
     </div>
   );
 };
@@ -219,6 +262,7 @@ SavedCardDetails.defaultProps = {
   onChange: null,
   onDeleteCard: null,
   deletePaymentMethodInProgress: false,
+  onManageDisableScrolling: null,
 };
 
 SavedCardDetails.propTypes = {
@@ -233,7 +277,7 @@ SavedCardDetails.propTypes = {
   }),
   onChange: func,
   onDeleteCard: func,
-  onManageDisableScrolling: func.isRequired,
+  onManageDisableScrolling: func,
   deletePaymentMethodInProgress: bool,
 };
 
