Jared Palmer is the creator and maintainer of Formik, the premiere forms solution for React applications. Formik makes forms in React easy by managing your form's state and providing validation on all of your fields.
How to use Formik with yup in React
Under the hood, Formik is using React Hooksand today we are going to make our own mini Formik with them! Writing a custom hook with useReducer lets you decouple your handlers and state from the component into a testable function.
The useEffect hook isn't the same as the componentDid It runs on each render, and you can pass an array that tells it to not run if the value hasn't changed from the previous render. Access all courses and lessons, track your progress, gain confidence and expertise. Joel Hooks: This is Jared Palmer. He created Formik for us, which is probably my favorite React library, and definitely the best experience I've ever had doing Internet forms. Thanks, Jared, for making that.
He's the lead engineer at the Palmer Group. We're going to learn how to use React forms with Hooks. We're not jumping into Formik. We're going to start with a blank React project and build it up in the build-your-own Formik style but the punchline is you should probably just use Formik if you're building React forms. This is more of a way to look at how you would think about these problems and what Formik's doing under the hood and what React Hooks bring to the table.
I think you mentioned to me that Formik, when you use it, React Hooks don't come into the picture, but under the hood, that's what you all have transformed it into Joel: internally. When you're using Formik, you're just using Formik. You don't really have to think about React hooks, but we thought it would be interesting to show folks what React hooks looks like and do it in the context of forms, which are notoriously difficult to manage state-wise.
I'm curious how React hooks play into that. If you want to just share your screen. It'll pop up on my screen. I can let Jared know that there's questions, and we'll answer them. Jared: What I did here was I went to the React docs. I literally copied in the basic form. Just want to quickly review how forms work in React, for anybody watching, in case this is something new.
Given the following example code not including the entire React Component code since it's irrelevant to the question :. I need to persist the original one the one from Formik while adding code that handles that checkbox change. There's some component behavior that depends on the checked value of that checkbox. Please notice that I'm not passing the onChange prop to email or password, since there is no extra behavior to code for on those.
The checkbox is the one that will have special behavior. You can declare a handler for the checkbox, and use it! Using the native handler of Formkit, and your custom handler.
Learn more. Asked 1 year, 9 months ago. Active 6 months ago. Viewed 17k times. Given the following example code not including the entire React Component code since it's irrelevant to the question : class RegisterPage extends React.
Yup schema here Arnie Arnie 1 1 gold badge 1 1 silver badge 7 7 bronze badges. Have you tried something? The custom onChange for the Field overlaps the one from Formik?
That is why email and password are not being passed the onChange prop: withFormik takes care of the change handling for you. However, when you DO need to perform some task in the change event, you can specify which handler to call, but I don't know how to specify it. So I need to know how to pass in the handleChange so that I can persist formik's handling and add custom code to it. Had you tried to just put a handler inside the onChange? I'll post an answer below but I'll leave it open just in case somebody comes up with something even better ;- thanks man!
Active Oldest Votes. That way formik stays linked to the checkbox. It does work, but has it setbacks. Here's the deal: 1 The call to this. Otherwise Formik will not update the form values. This means that Formik is maintaining its own state and whatever you code after that call is too fast for formik to be able to update the checkbox's state before you can use its new value.
Arnie How'd you do your final solution of extending Formik's change function? Unfortunately I never found a final solution to this issue. I ended up solving my situation in another way: by simply not using that checkbox as part of my implementation.
I chose to satisfy the use of that checkbox with a different solution and moved on. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.It uses a render props pattern made popular by libraries like React Motion and React Router.
Returns true if values are not deeply equal from initial values, false otherwise. Form validation errors. Should match the shape of your form's values defined in initialValues. If you are using validationSchema which you should bekeys and shape will match your schema exactly.
Internally, Formik transforms raw Yup validation errors on your behalf. If you are using validatethen that function will determine the errors objects shape. Useful for when you need to track whether an input has been touched or not.
General input change event handler. This will update the values[key] where key is the event-emitting input's name attribute. If the name attribute is not present, handleChange will look for an input's id attribute.#20 Try REACTJS Tutorial - Handle Form and Input Data
Note: "input" here means all HTML inputs. Reset handler. Will reset the form to its initial state. Submit handler. To learn more about the submission process, see Form Submission.
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Submitting state of the form. Returns true if submission is in progress and false otherwise. Returns true if there are no errors i. Note: isInitialValid was deprecated in 2. However, for backwards compatibility, if the isInitialValid prop is specified, isValid will return true if the there are no errorsor the result of isInitialValid of the form if it is in "pristine" condition i.
Returns true if Formik is running validation during submission, or by calling [ validateForm ] directly false otherwise. To learn more about what happens with isValidating during the submission process, see Form Submission. Imperatively reset the form. If nextInitialState is specified, Formik will set this state as the new "initial state" and use the related values of nextInitialState to update the form's initialValues as well as initialTouchedinitialStatusinitialErrors.
This is useful for altering the initial state i. If nextInitialState is not defined, then Formik will reset state to the original initial state. The latter is useful for calling resetForm within componentDidUpdate or useEffect. Set the error message of a field imperatively. Useful for creating custom input error handlers. Set the touched state of a field imperatively.The code for this walkthrough is available here. This blog has also been posted on Medium.
This simple composability is one of the main reasons I enjoy working with it.
But, it is not an application framework. This can be useful when all you want is some quick UI. But, as the application grows, you will need to depend on outside libraries for things like state-management, routing, and forms. In this article, I cover how a React application can and should handle user input with Formik. Learn how to handle form input, from basic form input using simple state through to advanced form components using Formik.
If you need a refresher, checkout this great article here and the official React docs. In the latter case, you could end up with way too many to deal with, so you need to be able to search for them. Not too bad. React makes you allows you to control the data flow explicitly in your application. This is great in that the data-flow is unidirectional, which helps cut down on side effects in large applications.
It does what we want in this case. The Steam Autumn Sale is coming up soon, and I want to make sure I can add some games to my collection. Here we can see multiple custom TextInput controls in their natural habitat.
But wait… What about different types of inputs? What about validating each of those form inputs? What about only validating after the user has left a field to promote good UX? What about asynchronous validation? What about disabling inputs and changes while asynchronous submission is occurring? How do we handle nested form values? How about checking for changes and dirty fields? As you can see, there are many concerns when developing a user experience for forms. These are the types of things that separate a frustrating experience from a quality one.
We could definitely handle all these cases with some work, and over time, it would be great to abstract out many of the concerns above and develop a library that we could use to address these issues. Luckily for us, Formik already has.
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Asked 1 year ago.
Active 6 months ago. Viewed 1k times. Deepankar Singh Deepankar Singh 57 5 5 bronze badges. Haven't had much time What modal are you using? Active Oldest Votes. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.
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At first, we create Sign Up form with Formik library. I like Formik because it is lightweight, almost no abstraction library to help you create forms in React. In our example, Formik helps us to keep state values, errors and whether the form is being submitted and handle changes. It also calls validation function for us on every submit. I use Formik as a React component with render propbut you can also use it as HoC. How do we validate this?
We could probably find more approaches to how to validate such form. I mentioned no if s, because it could be tempting to start with something like this:. There must be some other, more declarative way, without if s.
Fortunately, Formik itself allows to use Yup validation library by default. This looks much better than if s, but it works only until you need some cross validations.
In this case you can still use Yup, but together with your own validation function. We create getValidationSchema function.
The Joy of Forms with React and Formik
It takes values object and returns validation schema similar like in the example above. I just want to highlight two points here:. Next, we just call method validateSync on this schema:.
It would be better if it returned errors object directly. Anyway, I wrote another simple function which takes this error object and returns errors object in the form we want with just first validation error message for every form field :.
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I also faced this problem yesterday. My problem was to submit form that contains ant design dropdown. I finally make it work after hours of:. The doc said you need to set onChangeonBlur events to setFieldValuesetFieldTouched props respectively like 3rd-party input example:. A more robust way to handle select components whilst using Formik would be to also use Jed Watsons react-select component.
The two work together nicely and abstract away a lot of the boilerplate you would normally need to implement to get the component working seamlessly with Formik. There are a few gotchas, you have to include the react select css for the component to display properly.
Learn more. How to receive select value in handlesubmit function with formik react js? Ask Question. Asked 1 year, 11 months ago. Active 1 year, 9 months ago. Viewed 14k times. Ahmad Ahmad 1, 2 2 gold badges 10 10 silver badges 33 33 bronze badges. Active Oldest Votes. Here is my CodeSandbox. Faktor 10 Faktor 10 1, 1 1 gold badge 16 16 silver badges 22 22 bronze badges.
Just to clarify, I renamed your category field to option. So when you see option in my example it actually refers to your category field. Why would this be a more robust way? Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Socializing with co-workers while social distancing.
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