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JavaScript DataCollection - beforeGroup Event

fires before grouping of data has started

interface IGroupConfig {
    showMissed?: boolean | string; // true by default
    field?: string; // "group" by default
}

beforeGroup: (config: IGroupConfig) => boolean | void;

• config - the configuration object used for data grouping
  • showMissed - (optional) specifies whether the elements that don't have the field for grouping should be displayed, true by default
    • if set to true, the rows that don't have values for grouping are rendered row by row after all the data
    • if a string value is set, e.g. "Missed", the rows that don't have values for grouping are rendered as a separate group the name of which will have the specified string value. This group will be rendered as the last one
    • if set to false, the rows that don't suit the grouping criteria won't be rendered
  • field - (optional) the group field name, "group" by default

Return false to prevent data grouping; otherwise, true.

Example

component.data.events.on("beforeGroup", (config) => {
    console.log("Grouping starts:", config);
    return true; // continue grouping
});

added in v9.0

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