next.js/examples/cms-sitecore-xmcloud/src/components/ColumnSplitter.tsx

import React from "react";
import {
  ComponentParams,
  ComponentRendering,
  Placeholder,
} from "@sitecore-jss/sitecore-jss-nextjs";

interface ComponentProps {
  rendering: ComponentRendering & { params: ComponentParams };
  params: ComponentParams;
}

export const Default = (props: ComponentProps): JSX.Element => {
  const styles = `${props.params.GridParameters ?? ""} ${
    props.params.Styles ?? ""
  }`.trimEnd();
  const columnWidths = [
    props.params.ColumnWidth1,
    props.params.ColumnWidth2,
    props.params.ColumnWidth3,
    props.params.ColumnWidth4,
    props.params.ColumnWidth5,
    props.params.ColumnWidth6,
    props.params.ColumnWidth7,
    props.params.ColumnWidth8,
  ];
  const columnStyles = [
    props.params.Styles1,
    props.params.Styles2,
    props.params.Styles3,
    props.params.Styles4,
    props.params.Styles5,
    props.params.Styles6,
    props.params.Styles7,
    props.params.Styles8,
  ];
  const enabledPlaceholders = props.params.EnabledPlaceholders.split(",");
  const id = props.params.RenderingIdentifier;

  return (
    <div
      className={`row component column-splitter ${styles}`}
      id={id ? id : undefined}
    >
      {enabledPlaceholders.map((ph, index) => {
        const phKey = `column-${ph}-{*}`;
        const phStyles = `${columnWidths[+ph - 1]} ${
          columnStyles[+ph - 1] ?? ""
        }`.trimEnd();

        return (
          <div key={index} className={phStyles}>
            <div key={index} className="row">
              <Placeholder
                key={index}
                name={phKey}
                rendering={props.rendering}
              />
            </div>
          </div>
        );
      })}
    </div>
  );
};