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Does anyone know if you can do this in reactjs? It would be awesome to build a excel like spreadsheet with user-input formulas.

• danthejam 10y ago
  As another poster said, you can use Meteor's Tracker and ReactiveVar modules to do it. Here's a standalone package that doesn't require the Meteor platform: https://www.npmjs.com/package/meteor-standalone-tracker https://www.npmjs.com/package/meteor-standalone-tracker
• untog 10y ago
  Wouldn't it be backwards to do this in React? Everything is controlled by a state object you manually set, so you already know when values are going to change.
  • sandGorgon 10y ago
    actually - I'm talking about a function expression. Think about a spreadsheet with a formula similar to "=SUM(A1+B1)". What this means is that when A1 or B1 change.. then this formula result should get re-computed. Remember that A1 and B1 themselves may be computed results... what happens today is that I need to recompute ALL formulas - because there is no easy way to know which formulas changed.
• nunyabuizness 10y ago
  Check out MobX, as it comes with React bindings to re-render components when their reactive dependencies change: https://github.com/mobxjs/mobx https://github.com/mobxjs/mobx
• goldenkey 10y ago
  Check out https://www.npmjs.com/package/watchjs https://www.npmjs.com/package/watchjs
• egeozcan 10y ago
  There is Baobab[1] - it is a single state-tree approach, while supporting computed values in the tree and has a react adapter[2]. [1]: https://github.com/Yomguithereal/baobab#computed-data-or-monkey-business https://github.com/Yomguithereal/baobab#computed-data-or-mon... [2]: https://github.com/Yomguithereal/baobab-react https://github.com/Yomguithereal/baobab-react
• gagege 10y ago
  How about RxJS? https://github.com/Reactive-Extensions/RxJS https://github.com/Reactive-Extensions/RxJS