Fetch data and handle results: useQueries.The specifics of building this API is outside the scope of this article. This article will describe working with APIs that fetch data from authenticated users. Again, this is just a personal preference for clarity and is not necessary.įor a larger app, I would recommend storing all API calls in custom hooks, in the pattern outlined in this example from the docs here, and this Medium article. For readability, I write all of my API calls as separate functions and call them within the useQuery hook. Axios and react-query both return responses wrapped in an envelope called data, so it will result in needing to drill into objects like data.data to get results. I use the library axios to make all API calls, and will use it here, but it is not necessary. Paginate fetched data: useInfiniteQuery.Act when query finishes: useQuery with onSuccess, onError, or onSettled.Fetch data conditionally: useQuery with enabled.Fetch a subset of data using query strings or query params: useQuery with parameters.This example app will be a note-writing tool like Evernote, and I’ll just outline data fetching cases. These examples will assume some familiarity with react-query, such as with the useQuery hook, but not beyond the basics. The documentation for react-query is excellent, but I found myself wishing for more practical examples while learning it. This article will detail patterns for a CRUD app, plus some bonus patterns. Next we create a file called exports.React-query is a gorgeous data fetching library that has received well-deserved praise. The modal will be defined in the home page. Then when saving is successful we set the contacts in the store and call onSave prop, which is a function to close the modal the form is in. The handleSubmit function checks if the data is valid, and if it is, then it will proceed to saving according to whether it is adding or editing a contact. The parameter of the ContactForm function are props, which we will pass in from the HomePage component that we will build later. The second argument of the matches, min, and max functions are also validation messages. The argument in the required function is the validation error message. The schema object is what Formik will check against for form validation. To display form validation messages, we have to pass in the isInvalid prop to each Form.Control component. Notice that in each value prop, we have ||'' so we do not get undefined values and prevent uncontrolled form warnings from getting triggered. The parameter in the function is the data we entered, with the field name as the key, as defined by the name attribute of each field and the value of each field as the value of those keys. handleSubmit is the function that we passed into the onSubmit handler of the Formik component. HandleChange is a function that lets us update the form field data from the inputs without writing the code ourselves. We use our Boostrap Form component nested in the Formik component so that we can use Formik’s handleChange, handleSubmit, values, touched and errors parameters. We pass in the contactsStore from the HomePage component, allowing us to use the data and functions in contactsStore.įor form validation, we use Formik to facilitate building our contact form. then(function(response) export default ContactForm The following is a basic example using fetch: fetch(''). The fetch function returns a promise which resolves when the request completes. Using the Fetch API starts with calling the fetch() function, which allows us to make HTTP requests with the standard HTTP verbs: GET, POST, PUT, PATCH and DELETE. The Fetch API is a web standard built into most modern browsers to let us make HTTP requests to the server. Subscribe to my email list or follow me on Twitter
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