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mobx computed not updating

I am going to change my code and try that out, and get back to you. For example: Note: always define the setter after the getter, some TypeScript versions are known to declare two properties with the same name otherwise. For example imperative side effects like logging, making network requests etc. I strongly feel that this scenario is different from the above, because IT IS using an observable field. Sign in Besides that they are highly optimized, so use them wherever possible. See this for more information: its working, so we need a trigger in the parent component to trigger in any state changes? Already on GitHub? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. It is strongly recommended to always throw Error's, so that the original stack trace is preserved. Use them wherever possible. When using computed as modifier or as box, it accepts a second options argument with the following optional arguments: The @computed decorator does not take arguments. they're used to gather information about the pages you visit and how many clicks you need to accomplish a task. new to mobx ,learnt it the hard way , any component that needs to render a observer should be wrapped in a observer, one more thing i would like to add that its the duty of child to take care of its render method . It is possible to define a setter for computed values as well. Reactions are methods that, as computed values, react to state changes, but they produce “side-effects” and not the value itself. i am also new to mobx so, still getting around, will try your way and let you know. (Btw, I deliberately didn't make the downloadStatus field observable, because it also has intermediary status flags that are of no interest to the component and shouldn't trigger rendering.). import {r} from 'mobx-jsx' import {observable} [MobX 4 and lower] peek() Returns an array with all the values which can safely be passed to other libraries, similar to slice(). to your account. If there are interesting and uninteresting values about downloadStatus, it sounds to me like you need two statues for downloads, where one is computed from the other and used by the components. @mweststrate - Just wanted to confirm that I understand how things work - In the toy example above, neither parent nor child component will actually render with changes to the store.some observable. My code first updates the downloadStatus field and then the cacheFile field. GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. JS primitives(string, number, boolean, null, undefined) functions are not observable by default, observable() function automatically converts an object, an array, or a map into an observable entity. Ok. In such cases it will be suspended. You need to ensure that all components that depend on any observable property actually dereferences the property so that the @observer decorator essentially lets MobX know which observable to subscribe to for any given component. One thing though is I dont have a .bablerc file, I have it inside my package.json at the bottom; not sure if that has anything to do with it. Not sure this is a bug, but wanted to report it anyway: I have a component using a computed field (fileUri) in another class. If your environment doesn't support decorators, use the computed(expression) modifier in combination with extendObservable / observable to introduce new computed properties. to your account, i have two components in react using mobx. Computed not updating if also unobserved fields are used? It is possible to define a setter for computed values as well. Already on GitHub? Please let me know if you need any further info, I really appreciate the help. Not quite sure why mobx wasnt working in my scenario, it did not work in the example repo I posted, but I react-easy-state ended up accomplishing what I was looking for. they're used to log you in. So const SelectedCustomer = observable.box("All Customer"). computed usually behaves the way you want it to out of the box, but it's possible to customize its behavior by passing in an options argument. Very few people will see it here, so I am locking. : throw new Error("Uhoh") instead of throw "Uhoh". Not sure this is a bug, but wanted to report it anyway: I have a component using a computed field (fileUri) in another class. They can be used for reaction as well. This automatic suspension is very convenient. If you want to to create a computed property which does custom comparison, use @computed.equals(comparer). https://github.com/mobxjs/mobx/blob/gh-pages/docs/best/react.md. For example, this can be quite useful in unit test setup, where the warnings don't always have much value. I gave it another go a few days ago and kept facing the same problem. Only if change the computed field to this: the desired behaviour works - i.e. This allows MobX to automatically suspend computations that are not actively in use to avoid unnecessary updates to computed values that are not being accessed. I've been banging my head against this for quite some time. It will make a structural comparison first, rather than a reference equality check, before notifying observers. E.g. Render is now properly triggered when updating properties individually. @sourceship had no time to look earlier. Changing the default behavior here is an anti-pattern. Although getters don't take arguments, several strategies to work with derived values that need arguments are discusses here. None in your case, so as far as MobX is concerned, there is no reason why the component should re-render. However, in real life situations this by far the best default, and you can always forcefully keep a computed value awake if you need to by using either observe or keepAlive. privacy statement. But if a computed property is not in use by some reaction, then computed expressions are evaluated each time their value is requested, so they behave just like a normal property. Nor will a computed property re-run if is not in use by some other computed property or reaction. Use .get() on the returned object to get the current value of the computation. If a computed value is no longer observed, for example the UI in which it was used no longer exists, MobX can automatically garbage collect it. For example: {} Tip: computed.struct for comparing output structurally. This allows MobX to automatically suspend computations that are not actively in use <, Mobx store changes are not updated in other components. Check out the equals option for further customizations on determining whether the output has changed. This form of computed is not used very often, but in some cases where you need to pass a "boxed" computed value around it might prove itself useful, one such case is discussed here.

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