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CSS

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HTML 

              
                <!-- 
  Resize the preview pane until you see the scroll navigation. (Change View > Editor Layout > first layout is best)
  
  This is the stock HTML for the Polaris data-table component example pasted in here, with some Polaris-DataTable__Pip elements added, one for each column found.
  
  On top of the stock HTML, I added the necessary data- attributes to make the table-scroll Stimulus controller work. Just search the code for instances of "table-scroll" and you'll see the important Stimulus bits. The Stimulus controller picks that up (not just on load but on DOM update) and coordinates the interactivity.
  -->
  
  <div style="--top-bar-background: #00848e; --top-bar-background-lighter: #1d9ba4; --top-bar-color: #f9fafb; --p-frame-offset: 0px;">
    <div class="Polaris-Page">
      <div class="Polaris-Page-Header Polaris-Page-Header--mobileView">
        <div class="Polaris-Page-Header__MainContent">
          <div class="Polaris-Page-Header__TitleActionMenuWrapper">
            <div class="Polaris-Page-Header__TitleWrapper">
              <div>
                <div class="Polaris-Header-Title__TitleAndSubtitleWrapper">
                  <div class="Polaris-Header-Title">
                    <h1 class="Polaris-DisplayText Polaris-DisplayText--sizeLarge"><span class="Polaris-TextStyle--variationStrong">Sales by product</span></h1>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
      <div class="Polaris-Page__Content">
        <div class="Polaris-Card">
          <div data-controller="table-scroll"
               data-table-scroll-nav-shown-class="Polaris-DataTable--condensed"
               data-table-scroll-nav-hidden-class="Polaris-DataTable"
               data-table-scroll-button-disabled-class="Polaris-Button--disabled"
               data-table-scroll-indicator-visible-class="Polaris-DataTable__Pip--visible"
          >
            <div class="Polaris-DataTable"
                 data-table-scroll-target="navBar"
            >
              <div class="Polaris-DataTable__Navigation" style="justify-content: center;">
                <button     
                        type="button"
                        class="Polaris-Button Polaris-Button--disabled Polaris-Button--plain Polaris-Button--iconOnly"
                        disabled=""
                        aria-label="Scroll table left one column" 
                        data-table-scroll-target="leftButton"
                        data-action="table-scroll#scrollLeft"
                ><span class="Polaris-Button__Content"><span class="Polaris-Button__Icon"><span class="Polaris-Icon"><svg viewBox="0 0 20 20" class="Polaris-Icon__Svg" focusable="false" aria-hidden="true">
                          <path d="M12 16a.997.997 0 0 1-.707-.293l-5-5a.999.999 0 0 1 0-1.414l5-5a.999.999 0 1 1 1.414 1.414L8.414 10l4.293 4.293A.999.999 0 0 1 12 16z"></path>
                        </svg></span></span></span>
                </button>

                <div class="Polaris-DataTable__Pip"
                     data-table-scroll-target="columnVisibilityIndicator"></div>
                <div class="Polaris-DataTable__Pip"
                     data-table-scroll-target="columnVisibilityIndicator"></div>
                <div class="Polaris-DataTable__Pip"
                     data-table-scroll-target="columnVisibilityIndicator"></div>
                <div class="Polaris-DataTable__Pip"
                     data-table-scroll-target="columnVisibilityIndicator"></div>
                <div class="Polaris-DataTable__Pip"
                     data-table-scroll-target="columnVisibilityIndicator"></div>

                <button
                        type="button"
                        class="Polaris-Button Polaris-Button--plain Polaris-Button--iconOnly"
                        aria-label="Scroll table right one column"
                        data-table-scroll-target="rightButton"
                        data-action="table-scroll#scrollRight"
                ><span class="Polaris-Button__Content"><span class="Polaris-Button__Icon"><span class="Polaris-Icon"><svg viewBox="0 0 20 20" class="Polaris-Icon__Svg" focusable="false" aria-hidden="true">
                          <path d="M8 16a.999.999 0 0 1-.707-1.707L11.586 10 7.293 5.707a.999.999 0 1 1 1.414-1.414l5 5a.999.999 0 0 1 0 1.414l-5 5A.997.997 0 0 1 8 16z"></path>
                        </svg></span></span></span>
                </button>
              </div>
              <div class="Polaris-DataTable">
                <div class="Polaris-DataTable__ScrollContainer" data-table-scroll-target="scrollArea">
                  <table class="Polaris-DataTable__Table">
                    <thead>
                      <tr>
                        <th data-polaris-header-cell="true" class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--firstColumn Polaris-DataTable__Cell--header" scope="col" data-table-scroll-target="column">Product</th>
                        <th data-polaris-header-cell="true" class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--header Polaris-DataTable__Cell--numeric" scope="col" data-table-scroll-target="column">Price</th>
                        <th data-polaris-header-cell="true" class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--header Polaris-DataTable__Cell--numeric" scope="col" data-table-scroll-target="column">SKU Number</th>
                        <th data-polaris-header-cell="true" class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--header Polaris-DataTable__Cell--numeric" scope="col" data-table-scroll-target="column">Net quantity</th>
                        <th data-polaris-header-cell="true" class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--header Polaris-DataTable__Cell--numeric" scope="col" data-table-scroll-target="column">Net sales</th>
                      </tr>
                      <tr>
                        <th class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--firstColumn Polaris-DataTable__Cell--total" scope="row">Totals</th>
                        <td class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--total"></td>
                        <td class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--total"></td>
                        <td class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--total Polaris-DataTable__Cell--numeric">255</td>
                        <td class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--total Polaris-DataTable__Cell--numeric">$155,830.00</td>
                      </tr>
                    </thead>
                    <tbody>
                      <tr class="Polaris-DataTable__TableRow">
                        <th class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--firstColumn" scope="row">Emerald Silk Gown</th>
                        <td class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--numeric">$875.00</td>
                        <td class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--numeric">124689</td>
                        <td class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--numeric">140</td>
                        <td class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--numeric">$122,500.00</td>
                      </tr>
                      <tr class="Polaris-DataTable__TableRow">
                        <th class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--firstColumn" scope="row">Mauve Cashmere Scarf</th>
                        <td class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--numeric">$230.00</td>
                        <td class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--numeric">124533</td>
                        <td class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--numeric">83</td>
                        <td class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--numeric">$19,090.00</td>
                      </tr>
                      <tr class="Polaris-DataTable__TableRow">
                        <th class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--firstColumn" scope="row">Navy Merino Wool Blazer with khaki chinos and yellow belt</th>
                        <td class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--numeric">$445.00</td>
                        <td class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--numeric">124518</td>
                        <td class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--numeric">32</td>
                        <td class="Polaris-DataTable__Cell Polaris-DataTable__Cell--verticalAlignTop Polaris-DataTable__Cell--numeric">$14,240.00</td>
                      </tr>
                    </tbody>
                  </table>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>
!

CSS
!

JS 

              
                function supportsIntersectionObserver() {
  return (
    "IntersectionObserver" in window ||
    "IntersectionObserverEntry" in window ||
    "intersectionRatio" in window.IntersectionObserverEntry.prototype
  );
}

class TableScrollController extends Stimulus.Controller {
  static targets = [
    "navBar",
    "scrollArea",
    "column",
    "leftButton",
    "rightButton",
    "columnVisibilityIndicator",
  ];
  static classes = [
    "navShown",
    "navHidden",
    "buttonDisabled",
    "indicatorVisible",
  ];

  connect() {
    this.startObservingColumnVisibility();
  }

  disconnect() {
    this.stopObservingColumnVisibility();
  }

  startObservingColumnVisibility() {
    if (!supportsIntersectionObserver()) {
      console.warn(`This browser doesn't support IntersectionObserver`);
      return;
    }
    
    this.intersectionObserver = new IntersectionObserver(
      this.updateScrollNavigation.bind(this),
      {
        root: this.scrollAreaTarget,
        threshold: 0.99, // otherwise, the right-most column sometimes won't be considered visible in some browsers, rounding errors, etc.
      }
    );

    this.columnTargets.forEach((headingEl) => {
      this.intersectionObserver.observe(headingEl);
    });
  }

  stopObservingColumnVisibility() {
    if (this.intersectionObserver) {
      this.intersectionObserver.disconnect();
    }
  }

  updateScrollNavigation(observerRecords) {
    observerRecords.forEach((record) => {
      record.target.dataset.isVisible = record.isIntersecting;
    });
    
    this.toggleScrollNavigationVisibility();
    this.updateColumnVisibilityIndicators();
    this.updateLeftRightButtonAffordance();
  }

  toggleScrollNavigationVisibility() {
    const allColumnsVisible =
      this.columnTargets.length > 0 &&
      this.columnTargets[0].dataset.isVisible === "true" &&
      this.columnTargets[this.columnTargets.length - 1].dataset.isVisible ===
        "true";
    
    if (allColumnsVisible) {
      this.navBarTarget.classList.remove(this.navShownClass);
      this.navBarTarget.classList.add(this.navHiddenClass);
    } else {
      this.navBarTarget.classList.add(this.navShownClass);
      this.navBarTarget.classList.remove(this.navHiddenClass);
    }
  }

  updateColumnVisibilityIndicators() {
    this.columnTargets.forEach((headingEl, index) => {
      const indicator = this.columnVisibilityIndicatorTargets[index];

      if (indicator) {
        indicator.classList.toggle(
          this.indicatorVisibleClass,
          headingEl.dataset.isVisible === "true"
        );
      }
    });
  }

  updateLeftRightButtonAffordance() {
    const firstColumnHeading = this.columnTargets[0];
    const lastColumnHeading = this.columnTargets[this.columnTargets.length - 1];

    this.updateButtonAffordance(
      this.leftButtonTarget,
      firstColumnHeading.dataset.isVisible === "true"
    );
    this.updateButtonAffordance(
      this.rightButtonTarget,
      lastColumnHeading.dataset.isVisible === "true"
    );
  }

  updateButtonAffordance(button, isDisabled) {
    if (isDisabled) {
      button.setAttribute("disabled", "");
      button.classList.add(this.buttonDisabledClass);
    } else {
      button.removeAttribute("disabled");
      button.classList.remove(this.buttonDisabledClass);
    }
  }

  scrollLeft() {
    // scroll to make visible the first non-fully-visible column to the left of the scroll area
    let columnToScrollTo = null;
    for (let i = 0; i < this.columnTargets.length; i++) {
      const column = this.columnTargets[i];
      if (columnToScrollTo !== null && column.dataset.isVisible === "true") {
        break;
      }
      if (column.dataset.isVisible === "false") {
        columnToScrollTo = column;
      }
    }

    this.scrollAreaTarget.scroll(columnToScrollTo.offsetLeft, 0);
  }

  scrollRight() {
    // scroll to make visible the first non-fully-visible column to the right of the scroll area
    let columnToScrollTo = null;
    for (let i = this.columnTargets.length - 1; i >= 0; i--) {
      // right to left
      const column = this.columnTargets[i];
      if (columnToScrollTo !== null && column.dataset.isVisible === "true") {
        break;
      }
      if (column.dataset.isVisible === "false") {
        columnToScrollTo = column;
      }
    }

    this.scrollAreaTarget.scroll(columnToScrollTo.offsetLeft, 0);
  }
}

const application = Stimulus.Application.start()
application.register('table-scroll', TableScrollController)
!
999px

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