Chart: Persist orderedKeys between state changes

plugins/woocommerce-admin/client/analytics/components/report-chart/index.js

@@ -2,8 +2,7 @@
 /**
  * External dependencies
  */
-import { __ } from '@wordpress/i18n';
+import { Component } from '@wordpress/element';
-import { Component, Fragment } from '@wordpress/element';
 import { compose } from '@wordpress/compose';
 import { format as formatDate } from '@wordpress/date';
 import { withSelect } from '@wordpress/data';
@@ -26,7 +25,7 @@ import {
 /**
  * Internal dependencies
  */
-import { Chart, ChartPlaceholder } from 'components';
+import { Chart } from 'components';
 import { getReportChartData, getTooltipValueFormat } from 'store/reports/utils';
 import ReportError from 'analytics/components/report-error';
 
@@ -72,17 +71,6 @@ export class ReportChart extends Component {
 			return <ReportError isError />;
 		}
 
-		if ( primaryData.isRequesting || secondaryData.isRequesting ) {
-			return (
-				<Fragment>
-					<span className="screen-reader-text">
-						{ __( 'Your requested data is loading', 'wc-admin' ) }
-					</span>
-					<ChartPlaceholder />
-				</Fragment>
-			);
-		}
-
 		const currentInterval = getIntervalForQuery( query );
 		const allowedIntervals = getAllowedIntervalsForQuery( query );
 		const formats = getDateFormatsForInterval( currentInterval, primaryData.data.intervals.length );
@@ -131,6 +119,7 @@ export class ReportChart extends Component {
 				x2Format={ formats.x2Format }
 				dateParser={ '%Y-%m-%dT%H:%M:%S' }
 				valueType={ selectedChart.type }
+				isRequesting={ primaryData.isRequesting || secondaryData.isRequesting }
 			/>
 		);
 	}

plugins/woocommerce-admin/client/components/chart/index.js

@@ -4,10 +4,10 @@
  */
 import { __ } from '@wordpress/i18n';
 import classNames from 'classnames';
-import { Component, createRef } from '@wordpress/element';
+import { Component, createRef, Fragment } from '@wordpress/element';
 import { decodeEntities } from '@wordpress/html-entities';
 import { formatDefaultLocale as d3FormatDefaultLocale } from 'd3-format';
-import { get, isEqual, partial, find } from 'lodash';
+import { get, isEqual, partial } from 'lodash';
 import Gridicon from 'gridicons';
 import { IconButton, NavigableMenu, SelectControl } from '@wordpress/components';
 import { interpolateViridis as d3InterpolateViridis } from 'd3-scale-chromatic';
@@ -26,6 +26,7 @@ import { H, Section } from '@woocommerce/components';
 import './style.scss';
 import D3Chart from 'components/d3chart';
 import Legend from 'components/d3chart/legend';
+import ChartPlaceholder from './placeholder';
 
 d3FormatDefaultLocale( {
 	decimal: '.',
@@ -81,7 +82,13 @@ class Chart extends Component {
 	componentDidUpdate( prevProps ) {
 		const { data } = this.props;
 		if ( ! isEqual( [ ...data ].sort(), [ ...prevProps.data ].sort() ) ) {
-			const orderedKeys = getOrderedKeys( this.props, this.state.orderedKeys );
+			/**
+			 * Only update the orderedKeys when data is present so that
+			 * selection may persist while requesting new data.
+			 */
+			const orderedKeys = data.length
+				? getOrderedKeys( this.props, this.state.orderedKeys )
+				: this.state.orderedKeys;
 			/* eslint-disable react/no-did-update-set-state */
 			this.setState( {
 				orderedKeys,
@@ -220,6 +227,7 @@ class Chart extends Component {
 			interval,
 			valueType,
 			type,
+			isRequesting,
 		} = this.props;
 		let { yFormat } = this.props;
 		const legendDirection = mode === 'time-comparison' && isViewportWide ? 'row' : 'column';
@@ -299,7 +307,16 @@ class Chart extends Component {
 						ref={ this.chartBodyRef }
 					>
 						{ isViewportWide && legendDirection === 'column' && legend }
-						{ width > 0 && (
+						{ isRequesting && (
+							<Fragment>
+								<span className="screen-reader-text">
+									{ __( 'Your requested data is loading', 'wc-admin' ) }
+								</span>
+								<ChartPlaceholder />
+							</Fragment>
+						) }
+						{ ! isRequesting &&
+							width > 0 && (
 								<D3Chart
 									colorScheme={ d3InterpolateViridis }
 									data={ visibleData }
@@ -399,6 +416,10 @@ Chart.propTypes = {
 	 * What type of data is to be displayed? Number, Average, String?
 	 */
 	valueType: PropTypes.string,
+	/**
+	 * Render a chart placeholder to signify an in-flight data request.
+	 */
+	isRequesting: PropTypes.bool,
 };
 
 Chart.defaultProps = {