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Demo
App.htm
App.js

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title id='Description'>
        This is an example of React chart line series with conditional colors. The data of the chart is loaded from a csv file. The colorFunction is modified to return the desired color. jqxChart will call this function for each data point. Sequential points that have the same color will be grouped automatically in a line segment.
    </title>
    <meta name="description" content="This React Chart demo showcases how to use Chart line series with conditional colors'" />
    <link rel="stylesheet" href="../../../jqwidgets/styles/jqx.base.css" type="text/css" />
    <script type="text/javascript" src="../../../jqwidgets/jqxcore.js"></script>
    <script type="text/javascript" src="../../../jqwidgets/jqxdraw.js"></script>
    <script type="text/javascript" src="../../../jqwidgets/jqxchart.core.js"></script>
    <script type="text/javascript" src="../../../jqwidgets/jqxdata.js"></script>
    <script type="text/javascript" src="../../../scripts/demos.js"></script>
</head>
<body>
    <div class="example-description" style="margin-bottom:3em">
        This is an example of React chart line series with conditional colors. The data of the chart is loaded from a csv file. The colorFunction is modified to return the desired color. jqxChart will call this function for each data point. Sequential points that have the same color will be grouped automatically in a line segment.
    </div>
    <div id="app"></div>
    <script src="../build/chart_lineseriewithconditionalcolors.bundle.js"></script>
</body>
</html>

import React from 'react';import ReactDOM from 'react-dom';import JqxChart from '../../../jqwidgets-react/react_jqxchart.js';class App extends React.Component {
    render() {
        let source =
            {
                datatype: 'csv',
                datafields: [
                    { name: 'Quarter' },
                    { name: 'Change' }
                ],
                url: '../sampledata/us_gdp_2008-2013.csv'
            };
        let dataAdapter = new $.jqx.dataAdapter(source, { async: false, autoBind: true, loadError: (xhr, status, error) => { alert('Error loading "' + source.url + '" : ' + error); } });

        let padding = { left: 5, top: 5, right: 10, bottom: 5 };

        let titlePadding = { left: 0, top: 0, right: 0, bottom: 10 };

        let categoryAxis =
            {
                dataField: 'Quarter',
                unitInterval: 1,
                textRotationAngle: -75,
                formatFunction: (value, itemIndex, serie, group) => {
                    return value;
                },
                valuesOnTicks: false
            };

        let seriesGroups =
            [
                {
                    type: 'line',
                    valueAxis:
                    {
                        description: 'Percentage Change',
                        formatFunction: (value) => {
                            return value + '%';
                        }
                    },
                    series:
                    [
                        {
                            dataField: 'Change',
                            displayText: 'Change',
                            // Modify this function to return desired colors.
                            // jqxChart will call the function for each data point.
                            // Sequential points that have the same color will be
                            // grouped automatically in a line segment
                            colorFunction: (value, itemIndex, serie, group) => {
                                return (value < 0) ? '#FF0000' : '#00FF00';
                            }
                        }
                    ]
                }
            ];
        return (
            <JqxChart style={{ width: 850, height: 500 }}
                title={'U.S. GDP Percentage Change'} description={'(source: Bureau of Economic Analysis)'}
                showLegend={false} enableAnimations={true} padding={padding} borderLineWidth={1}
                titlePadding={titlePadding} source={dataAdapter} categoryAxis={categoryAxis} showBorderLine={true}
                colorScheme={'scheme05'} seriesGroups={seriesGroups}
            />
        )
    }
}

ReactDOM.render(<App />, document.getElementById('app'));