JavaScript/jQuery Chart - Customize Point Labels

NOTE
This topic focuses on properties that customize the text of point labels and allow you to customize an individual label. There are other properties that customize labels, such as backgroundColor, font, border, etc., but their purpose and application is rather obvious, and for this reason, they are not detailed in this topic. For more information on them, please refer to the label section of the API reference.

If you need to change the text displayed by point labels, declare the customizeText function. It must return a string value. The argument of this function contains information about the point whose label is being customized. In the following example, the customizeText function instructs point labels to display both the argument and value of the point.

jQuery
JavaScript
$(function() {
    $("#chartContainer").dxChart({
        // ...
        series: {
            label: {
                visible: true,
                customizeText: function (pointInfo) {
                    return pointInfo.argument + ': ' + pointInfo.value;
                }
            }
        }
    });
});
Angular
HTML
TypeScript
<dx-chart ... >
    <dxi-series>
        <dxo-label
            [visible]="true"
            [customizeText]="customizeText">
        </dxo-label>
    </dxi-series>
</dx-chart>
import { DxChartModule } from "devextreme-angular";
// ...
export class AppComponent {
    customizeText (pointInfo: any) {
        return pointInfo.argument + ': ' + pointInfo.value;
    }
}
@NgModule({
    imports: [
        // ...
        DxChartModule
    ],
    // ...
})
Vue
App.vue
<template> 
    <DxChart ... >
        <DxSeries>
            <DxLabel
                :visible="true"
                :customize-text="customizeText"
            />
        </DxSeries>
    </DxChart>
</template>

<script>
import DxChart, {
    DxSeries,
    DxLabel
} from 'devextreme-vue/chart';

export default {
    components: {
        DxChart,
        DxSeries,
        DxLabel
    },
    methods: {
        customizeText (pointInfo) {
            return `${pointInfo.argument}: ${pointInfo.value}`;
        }
    }
}
</script>
React
App.js
import React from 'react';
import Chart, {
    Series,
    Label
} from 'devextreme-react/chart';

class App extends React.Component {
    render() {
        return (
            <Chart ... >
                <Series>
                    <Label
                        visible={true}
                        customizeText={this.customizeText}
                    />
                </Series>
            </Chart>
        );
    }

    customizeText (pointInfo) {
        return `${pointInfo.argument}: ${pointInfo.value}`;
    }
}

export default App;

You can also customize an individual label. For this purpose, assign a function to the customizeLabel property. This function must return an object with properties for the label that you want to customize. Note that the customizeLabel property should be declared at the root level of the Chart configuration.

jQuery
JavaScript
$(function() {
    $("#chartContainer").dxChart({
        // ...
        series: {
            label: {
                visible: true,
                backgroundColor: 'blue'
            }
        },
        // Assigns the red color to all labels whose series points have value more than 100
        // Other labels remain painted in blue
        customizeLabel: function (pointInfo) {
            return pointInfo.value > 100 ? { backgroundColor: 'red' } : { }
        }
    });
});
Angular
HTML
TypeScript
<dx-chart
    [customizeLabel]="customizeLabel">
    <dxi-series>
        <dxo-label
            [visible]="true"
            backgroundColor="blue">
        </dxo-label>
    </dxi-series>
</dx-chart>
import { DxChartModule } from "devextreme-angular";
// ...
export class AppComponent {
    // Assigns the red color to all labels whose series points have value more than 100
    // Other labels remain painted in blue
    customizeLabel (pointInfo: any) {
        return pointInfo.value > 100 ? { backgroundColor: 'red' } : { }
    }
}
@NgModule({
    imports: [
        // ...
        DxChartModule
    ],
    // ...
})
Vue
App.vue
<template> 
    <DxChart :customize-label="customizeLabel">
        <DxSeries>
            <DxLabel
                :visible="true"
                background-color="blue"
            />
        </DxSeries>
    </DxChart>
</template>

<script>
import DxChart, {
    DxSeries,
    DxLabel
} from 'devextreme-vue/chart';

export default {
    components: {
        DxChart,
        DxSeries,
        DxLabel
    },
    methods: {
        // Assigns the red color to all labels whose series points have value more than 100
        // Other labels remain painted in blue
        customizeLabel (pointInfo) {
            return pointInfo.value > 100 ? { backgroundColor: 'red' } : { };
        }
    }
}
</script>
React
App.js
import React from 'react';
import Chart, {
    Series,
    Label
} from 'devextreme-react/chart';

class App extends React.Component {
    render() {
        return (
            <Chart
                customizeLabel={this.customizeLabel}
            >
                <Series>
                    <Label
                        visible={true}
                        backgroundColor="blue"
                    />
                </Series>
            </Chart>
        );
    }

    // Assigns the red color to all labels whose series points have value more than 100
    // Other labels remain painted in blue
    customizeLabel (pointInfo) {
        return pointInfo.value > 100 ? { backgroundColor: 'red' } : { };
    }
}

export default App;

View Demo

See Also