AG GRID REACT UPDATE
AG GRID REACT PATCH
AG GRID REACT FULL

We didn’t see any immediate improvements in the interaction we were optimizing, but we expect this to reduce rerenders in a few other places.

They would benefit from this optimization, so we’re gradually implementing it. Only the onChange callback needs it – and we can safely delay the editorModel read until then.Ĭausal has a bunch of components using useCallback and useSelector like above. But we don’t need to, either! The component output doesn’t rely on the EditorModelstate.

Also, unlike useSelector(), useStore() can’t trigger a component render.

AG GRID REACT FULL

Unlike useSelector(), useStore() returns the full store object.This approach relies on Redux’s useStore( ) hook. That’s cheap in smaller apps but scales really, really poorly as your app grows.Īnd some of these computations are not really memorizable:Ĭonst editorModel = store.getState().editorModel If we don’t do that, some components will rerender unnecessarily. To make the code fast, we need to remember to memoize most computations – both in components (with UseMemo and UseCallback) and in Redux selectors (with reselect). React and Redux don’t help us to fall into a pit of success. With React and Redux, the code we write by default is not performant.

AG GRID REACT UPDATE

Others (like update 4, which rebuilds the model but doesn’t change anything) may be fixed by adding extra memoized selectors or comparison checks.īut there’s also a deeper, fundamental issue that is harder to fix. Some of these updates are caused by suboptimal Redux sagas (which we’re fixing). One category update causes four EditorModel updates. variableDimensionsLookup changes similarly (not shown). As you see, a single change causes four consecutive updates. This is how EditorModel changes if you update a single category value from 69210to 5.

AG GRID REACT PATCH

So why don’t we make AG Grid do this? Using yarn patch, let’s patch the package to eliminate the extra render: If AG Grid called setRowCtrlsOrdered immediately at step 2 instead of 5, we’d be able to avoid an extra render.

Because the state changed, the component rerenders again 💥Īs you can see, we’re rerendering the component twice just to update our hook 2! This isn’t great.

Inside useEffect state, React calls setRowCtrlsOrdered state and updates our hook 2.

The RowCtrls state state got updated, so React runs useEffect state.

Because the state changed, the component rerenders.

When the component mounts, it exposes several functions to the AG Grid core.

Now, if you look through the component’s source code, you’ll notice that hook 2 is updated inside a useEffect.

Okay, so we figured out that GridApi.refreshServerSide renders a bunch of RowContainerComp components, and these components rerender because their hook 2 change. For example, if a component calls useSelector from Redux, and useSelector uses four React hooks inside, React profiler might show you 'Hook 3 changed' when you should look for 'custom hook 1'. Instead, it counts every built-in hook (except useContext) inside. (This is probably because useContext is implemented differently from other hooks.) Also, React doesn’t keep track of custom hooks. That’s because React skips useContex† when counting hooks. Why won’t we just count hooks in the component? That’s the most obvious approach, but it rarely works.

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