Method formatTooltip

src/chart/sankey/SankeySeries.ts:249–280

(
        dataIndex: number,
        multipleSeries: boolean,
        dataType: 'node' | 'edge'
    )

    }

    formatTooltip(
        dataIndex: number,
        multipleSeries: boolean,
        dataType: 'node' | 'edge'
    ) {
        function noValue(val: unknown): boolean {
            return isNaN(val as number) || val == null;
        }
        // dataType === 'node' or empty do not show tooltip by default
        if (dataType === 'edge') {
            const params = this.getDataParams(dataIndex, dataType);
            const rawDataOpt = params.data as SankeyEdgeItemOption;
            const edgeValue = params.value;
            const edgeName = rawDataOpt.source + ' -- ' + rawDataOpt.target;
            return createTooltipMarkup('nameValue', {
                name: edgeName,
                value: edgeValue,
                noValue: noValue(edgeValue)
            });
        }
        // dataType === 'node'
        else {
            const node = this.getGraph().getNodeByIndex(dataIndex);
            const value = node.getLayout().value;
            const name = (this.getDataParams(dataIndex, dataType).data as SankeyNodeItemOption).name;
            return createTooltipMarkup('nameValue', {
                name: name != null ? name + '' : null,
                value: value,
                noValue: noValue(value)
            });
        }
    }

    optionUpdated() {}