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React : multiple grids crashes #2937

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@PlugNPush

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@PlugNPush

Hi,

I wanted to test gridstack for my project and made a very basic grid like this:

export function GridStackPage() {
  const [grid1Options] = useState(() => createGridOptions());
  const [grid2Options] = useState(() => createGridOptions());

  return (
    <div style={{ display: "flex", gap: "20px" }}>
      <div style={{ flex: 1 }}>
        <h3>Grid 1</h3>
        <GridStackProvider initialOptions={grid1Options}>
          <Toolbar gridNumber={1} />
          <GridStackRenderProvider>
            <GridStackRender componentMap={COMPONENT_MAP} />
          </GridStackRenderProvider>
        </GridStackProvider>
      </div>
      <div style={{ flex: 1 }}>
        <h3>Grid 2</h3>
        <GridStackProvider initialOptions={grid2Options}>
          <Toolbar gridNumber={2} />
          <GridStackRenderProvider>
            <GridStackRender componentMap={COMPONENT_MAP} />
          </GridStackRenderProvider>
        </GridStackProvider>
      </div>
    </div>
  );
}

Whenever I want to add a widget in them, it works fine for the last one but crashes for all the ones before (here grid 1).

The reason for the crash is :

Uncaught Error: Widget container not found for id: widget-39vq52659p5
    children grid-stack-render.tsx:55
    GridStackRender grid-stack-render.tsx:47
    React 18
    current grid-stack-render-provider.tsx:35
    renderCB grid-stack-render-provider.tsx:41
    createWidgetDivs utils.ts:128
    addWidget gridstack.ts:470
    addSubGrid grid-stack-provider.tsx:60
    onClick GridStackDemo.tsx:210

It comes from GridStackRenderProvider, in

<GridStackRenderContext.Provider
        value={useMemo(
          () => ({
            getWidgetContainer: (widgetId: string) => {
              return widgetContainersRef.current.get(widgetId) || null;
            },
          }),
          // ! gridStack is required to reinitialize the grid when the options change
          // eslint-disable-next-line react-hooks/exhaustive-deps
          [gridStack]
        )}
      >
        <div ref={containerRef}>{gridStack ? children : null}</div>
      </GridStackRenderContext.Provider>

as widgetContainersRef.current.get(widgetId) unexpectedly returns undefined.

I would appreciate some help here.

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