Mastering Remix Forms. A look at the key Remix feature | by Jose Granja | Apr, 2022

A have a look at the important thing Remix characteristic

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Remix has rapidly turn into certainly one of my favourite React JavaScript frameworks. Why? It embraces well-known and established net APIs and its progressive enhancement strategy.

Out of the field, Remix does carry out server-side rendering. So when JavaScript will not be out there our customers is not going to get a clean web page. They may get the identical HTML web page however with uncooked HTML expertise. The web page received’t be hydrated since no JavaScript shall be executing.

The large query is? How does Remix cope with varieties then? Through the use of the well-supported Browser HTML Varieties characteristic as a base. Provided that the person has JavaScript enabled it can improve its expertise additional.

How does that work in apply? On this article, we’ll have a look at this superior and intelligent performance. Not solely can we ship much less code to the consumer however we assist a wider vary of gadgets.

As talked about earlier Remix does embrace the default HTML Kind characteristic. The specs are easy, it’s only a put up request despatched to the server containing the person’s kind information.

There are two flavors to it:

  • When JavaScript is enabled — the communication will occur through AJAX. The shape submission is disabled through the occasion.preventDefault() methodology. The Kind is then serialized and submitted. The ensuing information is then returned to the consumer. It’s nonetheless doable to carry out operations like redirect.
  • When JavaScript is disabled — it can carry out the standard POST request. The response shall be a React server-rendered HTML.

How will the Remix be coping with the shape submissions? We have to expose an motion operate on the shape root web page.

Why does this operate have to be known as motion? To embrace additional the HTML Kind characteristic, and match its motion parameter.

<kind motion="/books">

The place would we host this? We will host that on the sting itself and delegate the motion to wherever we wish. How would we get the user-submitted information? Via the formData object which is contained within the request one. These match the online specs too 🚀.

Let’s see a trivial instance:

Within the above code, the motion named operate is exported from the E book.js web page. The shape handler must be all the time positioned within the web page root file. The shape must be all the time related to a web page, in any other case, it wouldn’t be reachable.

The Remix crew does present their very own declarative Kind abstraction.

About its conduct:

  • After a <Kind > submission all of the loaders shall be reloaded.
  • It serializes the Kind parts.
  • It gives some state suggestions via the useTransition hook.


  • motion: the placement to the place the shape shall be submitted. This may be omitted more often than not since we’ll use the identical rendered web page because the vacation spot. When matching a number of routes, solely the deepest matching route shall be used. We will use the index param to put up to an index route.
url -> route motion/accounts?index  -> routes/accounts/index.js
/accounts -> routes/accounts.js
  • methodology: it determines the HTTP verb to make use of: get, put up, put, patch, delete. The default worth is get. ⚠️ Solely get and put up are supported on native HTML Kind. Different verbs will break the non-JavaScript strategy.
  • encType: the default is utility/x-www-form-urlencoded. Use multipart/form-data for file uploads.
  • exchange: tells the Browser to switch the present entry within the historical past stack.
  • reloadDocument: will execute the non-JavaScript strategy even when JavaScript is enabled.

We’ve lined beforehand a easy instance. It had no validation in anyway. The place and the way will the shape validation occur?

As Remix does assist AJAX and Conventional Kind Requests we will’t depend on the consumer to carry out these validations. When JavaScript is disabled it wouldn’t be doable. Anyway, it’s a unhealthy apply to rely solely on client-side validation anyhow.

Remix embraces the dumb frontend fashion. All of the processing and validation will happen on the server.

How will the consumer find out about an error? As a great apply, we will return an object with a key errors with all of the errors particulars.

Let’s see an instance:

How does the React part find out about that? Through the use of the useActionData hook. This hook incorporates the data returned by the motion kind. We should always be capable of entry the errors object if any errors did occur.

As said within the Fundamentals part, within the non-JavaScript strategy, the HTML web page shall be returned with the error printed out. It will likely be server-rendered.

What about validation instruments? The Remix crew has made this course of easy by being open for extension. There are official adapters for zod and up. These are two of essentially the most well-known validation libraries.

Within the above part, we’ve seen how we will get the response from the server by utilizing the useActionData hook. There are extra hooks API that it’s price realizing about.

  • useSubmit — returns the operate to submit the shape programmatically. The operate takes an choice object with methodology, motion, encType or exchange attributes.
  • useTransition — it tells us all the pieces we have to know concerning the state of the shape submission. We will show loading states, disable kind submission, optimistic updates… and so forth All out of the field. ⚠️ It can be crucial to not mistake this one with the React.useTransition.
  • useFormAction— resolves the title of the <kind motion> by utilizing React Router’s relative paths. When is that helpful? When the button adjustments the conduct of the from motion and methodology.

On this article, we’ve seen how highly effective and totally featured Remix Varieties are. They assist us get began actually rapidly. Their API turns into intuitive as they observe very intently the HTML net specs. That is actually reassuring as they aren’t making an attempt to give you their very own specs however embrace what presently exists.

Their progressive enhancement strategy does take a bit to get used to. Nonetheless, the extra I exploit it the extra I prefer it.

We’re not restricted or certain to the Node instrument additionally. All we want is an edge supporting the fetch API. That makes it simpler to discover a appropriate place the place to host it.


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