fix loading jank in MultiCredentialLookup

awx/ui_next/src/components/ContentLoading/ContentLoading.jsx

@@ -4,8 +4,8 @@ import { withI18n } from '@lingui/react';
 import { EmptyState, EmptyStateBody } from '@patternfly/react-core';
 
 // TODO: Better loading state - skeleton lines / spinner, etc.
-const ContentLoading = ({ i18n }) => (
-  <EmptyState>
+const ContentLoading = ({ className, i18n }) => (
+  <EmptyState className={className}>
     <EmptyStateBody>{i18n._(t`Loading...`)}</EmptyStateBody>
   </EmptyState>
 );

awx/ui_next/src/components/Lookup/MultiCredentialsLookup.jsx

@@ -37,6 +37,7 @@ function MultiCredentialsLookup(props) {
   const [selectedType, setSelectedType] = useState(null);
   const [credentials, setCredentials] = useState([]);
   const [credentialsCount, setCredentialsCount] = useState(0);
+  const [isLoading, setIsLoading] = useState(false);
 
   useEffect(() => {
     (async () => {
@@ -56,6 +57,7 @@ function MultiCredentialsLookup(props) {
         return;
       }
       try {
+        setIsLoading(true);
         const params = parseQueryString(QS_CONFIG, history.location.search);
         const { results, count } = await loadCredentials(
           params,
@@ -63,6 +65,7 @@ function MultiCredentialsLookup(props) {
         );
         setCredentials(results);
         setCredentialsCount(count);
+        setIsLoading(false);
       } catch (err) {
         onError(err);
       }
@@ -133,6 +136,7 @@ function MultiCredentialsLookup(props) {
                 name="credentials"
                 qsConfig={QS_CONFIG}
                 readOnly={!canDelete}
+                isLoading={isLoading}
                 selectItem={item => {
                   if (isMultiple) {
                     return dispatch({ type: 'SELECT_ITEM', item });

awx/ui_next/src/components/PaginatedDataList/PaginatedDataList.jsx

@@ -25,10 +25,34 @@ import PaginatedDataListItem from './PaginatedDataListItem';
 class PaginatedDataList extends React.Component {
   constructor(props) {
     super(props);
+    this.state = {
+      height: 0,
+    };
+    this.ref = React.createRef();
     this.handleSetPage = this.handleSetPage.bind(this);
     this.handleSetPageSize = this.handleSetPageSize.bind(this);
   }
 
+  componentDidUpdate(prevProps) {
+    const { items } = this.props;
+    if (prevProps.items !== items) {
+      this.findHeight();
+    }
+  }
+
+  findHeight() {
+    if (!this.ref || !this.ref.current) {
+      return;
+    }
+    const { state } = this;
+    const height = this.ref.current.scrollHeight;
+    if (height && height !== state.height) {
+      this.setState({
+        height: this.ref.current.scrollHeight,
+      });
+    }
+  }
+
   handleSetPage(event, pageNumber) {
     const { history, qsConfig } = this.props;
     const { search } = history.location;
@@ -66,6 +90,7 @@ class PaginatedDataList extends React.Component {
       i18n,
       renderToolbar,
     } = this.props;
+    const { height } = this.state;
     const columns = toolbarColumns.length
       ? toolbarColumns
       : [
@@ -85,8 +110,14 @@ class PaginatedDataList extends React.Component {
     const emptyContentTitle = i18n._(t`No ${pluralizedItemName} Found `);
 
     let Content;
-    if (hasContentLoading && items.length <= 0) {
-      Content = <ContentLoading />;
+    if (hasContentLoading) {
+      Content = (
+        <ContentLoading
+          css={`
+            min-height: ${height}px;
+          `}
+        />
+      );
     } else if (contentError) {
       Content = <ContentError error={contentError} />;
     } else if (items.length <= 0) {
@@ -100,7 +131,7 @@ class PaginatedDataList extends React.Component {
     }
 
     return (
-      <Fragment>
+      <div ref={this.ref}>
         <ListHeader
           itemCount={itemCount}
           renderToolbar={renderToolbar}
@@ -129,7 +160,7 @@ class PaginatedDataList extends React.Component {
             onPerPageSelect={this.handleSetPageSize}
           />
         ) : null}
-      </Fragment>
+      </div>
     );
   }
 }