| IT |
InfoQ |
SFTP for Azure Blob Storage Now Generally Available |
https://www.infoq.com/news/2022/11/sftp-azure-blob-storage/?utm_campaign=infoq_content&utm_source=infoq&utm_medium=feed&utm_term=global
|
SFTP for Azure Blob Storage Now Generally Available By Renato Losio |
2022-11-05 05:01:00 |
| python |
Pythonタグが付けられた新着投稿 - Qiita |
Common Modulus Attack |
https://qiita.com/motimotipurinn/items/85d177282fa12da8cc20
|
commonmodulusattack |
2022-11-05 14:33:32 |
| python |
Pythonタグが付けられた新着投稿 - Qiita |
conda環境の保存と生成(environment.ymlを使用) |
https://qiita.com/TooFuu/items/bfe6f810be3d805d2846
|
ubuntu |
2022-11-05 14:33:04 |
| Ruby |
Rubyタグが付けられた新着投稿 - Qiita |
【Rails】params周りの理解を深める回〜"param is missing or the value is empty"へのアプローチ法〜 |
https://qiita.com/Akito_bsk/items/982312f5705458e25e47
|
aramis |
2022-11-05 14:46:22 |
| Ruby |
Rubyタグが付けられた新着投稿 - Qiita |
アプリケーション開発の開発工程（リマインドノート） |
https://qiita.com/hellotechcamp/items/23b7c01e5a4184841ca2
|
社会問題 |
2022-11-05 14:00:23 |
| AWS |
AWSタグが付けられた新着投稿 - Qiita |
FlutterでAWS AppSyncのSubscriptionを購読したい |
https://qiita.com/faable01/items/417f9dba663eee7712f0
|
awsappsync |
2022-11-05 14:05:50 |
| Ruby |
Railsタグが付けられた新着投稿 - Qiita |
【Rails】params周りの理解を深める回〜"param is missing or the value is empty"へのアプローチ法〜 |
https://qiita.com/Akito_bsk/items/982312f5705458e25e47
|
aramis |
2022-11-05 14:46:22 |
| Ruby |
Railsタグが付けられた新着投稿 - Qiita |
Railsコマンド備忘録 |
https://qiita.com/hellotechcamp/items/ff2568ed5adc5f51861c
|
rails |
2022-11-05 14:01:44 |
| Ruby |
Railsタグが付けられた新着投稿 - Qiita |
アプリケーション開発の開発工程（リマインドノート） |
https://qiita.com/hellotechcamp/items/23b7c01e5a4184841ca2
|
社会問題 |
2022-11-05 14:00:23 |
| 技術ブログ |
Developers.IO |
削除保護を設定したいCloudFormation StackをCDKで管理している場合の注意点 |
https://dev.classmethod.jp/articles/configure-deletion-protection-for-cloudformation-stack-with-aws-cdk/
|
cloudformationstack |
2022-11-05 05:32:38 |
| 技術ブログ |
Developers.IO |
Hugging FaceのLearning Rateを調整するためのSchedulerについて深堀する |
https://dev.classmethod.jp/articles/huggingface-usage-scheluder-type/
|
huggingface |
2022-11-05 05:29:25 |
| 海外TECH |
DEV Community |
Best Library To Create Simple And Complex Forms In React |
https://dev.to/myogeshchavan97/best-library-to-create-simple-and-complex-forms-in-react-k73
|
Best Library To Create Simple And Complex Forms In ReactCreating forms in React is a complex task It involves handling all the input states and their changes and validating that input when the form gets submitted For simple forms things are generally manageable But as your form gets more complex and you need to add various validations it becomes a complicated task So instead of manually writing all of the code and handling complex forms with validation logic we can use the most popular React library for this react hook form It s the most popular React library for creating forms compared to formik react final form and others and I use it for all my client projects In this article we will explore how to use the react hook form library in detail So let s get started Why the react hook form Library is the Most Popular Form Library in ReactFollowing are some of the reasons why react hook form is a popular choice for creating React forms The number of re renders in the application is smaller compared to the alternatives because it uses refs instead of state The amount of code you have to write is less as compared to formik react final form and other alternatives react hook form integrates well with the yup library for schema validation so you can combine your own validation schemas Mounting time is shorter compared to other alternatives Check out the react hook form website for more detailed comparison How to Create a Form Without Using a LibraryBefore creating a form using the react hook form library let s create a simple form without using any library Take a look at the below code import React useState from react import styles css export default function App const state setState useState email password const handleInputChange event gt const name value event target setState prevProps gt prevProps name value const handleSubmit event gt event preventDefault console log state return lt div className App gt lt form onSubmit handleSubmit gt lt div className form control gt lt label gt Email lt label gt lt input type text name email value state email onChange handleInputChange gt lt div gt lt div className form control gt lt label gt Password lt label gt lt input type password name password value state password onChange handleInputChange gt lt div gt lt div className form control gt lt label gt lt label gt lt button type submit gt Login lt button gt lt div gt lt form gt lt div gt Here s a Code Sandbox demo In the above code we have only two input fields namely email and password and a submit button Each input field has a value and onChange handler added so we can update the state based on the user s input Also we have added a handleSubmit method which displays the data entered in the form to the console This looks fine But what if we need to add validations like required field validation minimum length validation password validation email field validation and also display the corresponding error messages The code will become more complex and lengthy as the number of input fields and their validations increases How to Install react hook form LibraryDisplaying forms is a very common requirement in any application So let s learn why and how to use react hook form For that we ll create a new React application Create a new React project by running the following command from the terminal create react app demo react hook formOnce the project is created delete all files from the src folder and create new index js and styles css files inside the src folder To install the react hook form library execute the following command from the terminal npm install react hook form ORyarn add react hook form Here we re installing version of the react hook form library which is the latest version at the time of writing this article How to Create Initial PagesOpen the src index js file and add the following content inside it import React from react import ReactDOM from react dom client import App from App const root ReactDOM createRoot document getElementById root root render lt App gt Note that the above code is using React version syntax for rendering the app If you re using React version less than which you can confirm from the package json file then add the following code in your src index js file import React from react import ReactDOM from react dom import App from App ReactDOM render lt App gt document getElementById root Now open the src styles css file and add the content from here inside it Now create a new file called App js inside the src folder with the following content import React from react import styles css export default function App return lt div className App gt lt form gt lt div className form control gt lt label gt Email lt label gt lt input type text name email gt lt div gt lt div className form control gt lt label gt Password lt label gt lt input type password name password gt lt div gt lt div className form control gt lt label gt lt label gt lt button type submit gt Login lt button gt lt div gt lt form gt lt div gt Here we have just added the email and password fields to the form How to Create a Basic Form with react hook formThe react hook form library provides a useForm hook which we can use to work with forms Import the useForm hook like this import useForm from react hook form You can use the useForm hook like this const register handleSubmit formState errors useForm Here register is a function provided by the useForm hook We can assign it to each input field so that the react hook form can track the changes for the input field valuehandleSubmit is the function we can call when the form is submittederrors is a nested property in the formState object which will contain the validation errors if anyNow replace the contents of the App js file with the following code import React from react import useForm from react hook form import styles css export default function App const register handleSubmit formState errors useForm const onSubmit data gt console log data return lt div className App gt lt form onSubmit handleSubmit onSubmit gt lt div className form control gt lt label gt Email lt label gt lt input type text name email register email gt lt div gt lt div className form control gt lt label gt Password lt label gt lt input type password name password register password gt lt div gt lt div className form control gt lt label gt lt label gt lt button type submit gt Login lt button gt lt div gt lt form gt lt div gt In the above code we have added a register function to each input field that we got from the useForm hook by passing a unique name to each register function like this register email We re using the spread operator so react hook form will spread out all the required event handlers like onChange onBlur and other props for that input field If you add a console log register email inside the component you will see what it returns as can be seen below We also added the onSubmit function which is passed to the handleSubmit method like this lt form onSubmit handleSubmit onSubmit gt Note that you need to pass a unique name to the register function added for each input field so react hook form can track the changing data When we submit the form the handleSubmit function will handle the form submission It will send the user entered data to the onSubmit function where we re logging the user data to the console const onSubmit data gt console log data Now start the application by running the npm start or yarn start command and you will see the following screen Here s a Code Sandbox demo As you can see when we submit the form the details entered by the user are displayed in the console Also as compared to the code without react hook form which we saw at the start of this article in this Code Sandbox demo this code is much simpler This is because we don t have to add the value and onChange handler for each input field and there is no need to manage the application state ourselves How to Add Validations to the FormNow let s add the required field and minimum length validation to the input fields To add validation we can pass an object to the register function as a second parameter like this lt input type text name email register email required true gt lt input type password name password register password required true minLength gt Here for the email field we re specifying required field validation For the password field we re specifying the required field and minimum character length validation When the validation fails the errors object coming from the useForm hook will be populated with the fields for which the validation failed So we will use that errors object to display custom error messages Open the App js file and replace its contents with the following content import React from react import useForm from react hook form import styles css export default function App const register handleSubmit formState errors useForm const onSubmit data gt console log data return lt div className App gt lt form onSubmit handleSubmit onSubmit gt lt div className form control gt lt label gt Email lt label gt lt input type text name email register email required true pattern gt errors email amp amp errors email type required amp amp lt p className errorMsg gt Email is required lt p gt errors email amp amp errors email type pattern amp amp lt p className errorMsg gt Email is not valid lt p gt lt div gt lt div className form control gt lt label gt Password lt label gt lt input type password name password register password required true minLength gt errors password amp amp errors password type required amp amp lt p className errorMsg gt Password is required lt p gt errors password amp amp errors password type minLength amp amp lt p className errorMsg gt Password should be at least characters lt p gt lt div gt lt div className form control gt lt label gt lt label gt lt button type submit gt Login lt button gt lt div gt lt form gt lt div gt If you check the application now you will see the following screen Here s a Code Sandbox demo As you can see we re getting instant validation errors for each input field once we submit the form and then try to enter the values in the input fields If there is any error for any of the input field the errors object will be populated with the type of error which we re using to display our own custom error message like this errors email amp amp errors email type required amp amp lt p className errorMsg gt Email is required lt p gt errors email amp amp errors email type pattern amp amp lt p className errorMsg gt Email is not valid lt p gt Here based on the type of error we re displaying different error messages Using the ES optional chaining operator you can further simplify the above code like this errors email type required amp amp lt p className errorMsg gt Email is required lt p gt errors email type pattern amp amp lt p className errorMsg gt Email is not valid lt p gt In the similar way we have added the password field validation Also as you can see each input field is automatically focused when we submit the form if there is any validation error for that input field Also the form is not submitted as long as there is a validation error If you check the browser console you will see that the console log statement is only printed if the form is valid and there are no errors So using react hook form reduced the amount of code that we had to write The validation is also responsive so once the field becomes valid the error message goes away instantly But as the number of validations for each field increases the conditional checks and error message code will still increase So we can further refactor the code to make it even simpler Take a look at the below code import React from react import useForm from react hook form import styles css export default function App const register handleSubmit formState errors useForm const onSubmit data gt console log data return lt div className App gt lt form onSubmit handleSubmit onSubmit gt lt div className form control gt lt label gt Email lt label gt lt input type text name email register email required Email is required pattern value message Email is not valid gt errors email amp amp lt p className errorMsg gt errors email message lt p gt lt div gt lt div className form control gt lt label gt Password lt label gt lt input type password name password register password required Password is required minLength value message Password should be at least characters gt errors password amp amp lt p className errorMsg gt errors password message lt p gt lt div gt lt div className form control gt lt label gt lt label gt lt button type submit gt Login lt button gt lt div gt lt form gt lt div gt In the code above we have changed the email and password validation code For the email input field we changed this previous code register email required true pattern to the below code register email required Email is required pattern value message Email is not valid Here we ve directly provided the error message we want to display while adding the validation itself So we no longer need to add extra checks for each validation We are displaying the error message using the message property available inside the errors object for each input field like this errors email amp amp lt p className errorMsg gt errors email message lt p gt So by doing it this way the code is further simplified which makes it easy to add extra validations in the future Note that if there are validation errors the onSubmit handler will not be executed and the corresponding input field will automatically be focused which is a good thing Here s an updated Code Sandbox demo How to Add Multiple ValidationsYou can even provide multiple validations for the input field by adding a validate object This is useful if you need to perform complex validations like this lt input type password name password register password required true validate checkLength value gt value length gt matchPattern value gt d a z A Z s test value gt and to display the error messages we use it like this errors password type required amp amp lt p className errorMsg gt Password is required lt p gt errors password type checkLength amp amp lt p className errorMsg gt Password should be at least characters lt p gt errors password type matchPattern amp amp lt p className errorMsg gt Password should contain at least one uppercase letter lowercaseletter digit and special symbol lt p gt Here s a Code Sandbox demo How to Reset the Form ValuesSometimes we need to reset clear the data entered by the user after some action For example once the form is submitted we want to show the success message and then clear the form data so the user should not re submit the same data In such a case we can call the reset function returned by the useForm hook to clear the form data const reset useForm Here s a Code Sandbox demo The reset function also accepts an optional object where you can pass the values you want the form data to reset reset username Alex email alex example com password Test Here the key username email or password should match with the name passed to the register function so the respective input field will be set to the passed value How to Set Initial Form Values Using defaultValuesThe useForm hook accepts a list of options one of which is defaultValues Using defaultValues we can set initial values for the form elements and re set them when moving from one page to another like this const user props const register handleSubmit formState errors useForm defaultValues first name user first name last name user last name JSX lt Form Control type text register first name gt lt Form Control type text register last name gt In the above code for the register function we ve passed first name as the name This means that in the defaultValues we re using the same name to set the initial value So to correctly set the input value you need to use the same name used in the register function for setting the initial value using defaultValues Here s a Code Sandbox demo How to Use react hook form with Other LibrariesSometimes we might be using some external libraries like react select to allow multiple selection in a dropdown In such cases we can t directly add the register function for showing the select dropdown So If we want to add react hook form validations without writing our own code and handler function we can use the Controller component from react hook form like this import React from react import useForm Controller from react hook form import Select from react select import styles css const departments value Computer Science label Computer Science value Physics label Physics value Chemistry label Chemistry value Mathematics label Mathematics export default function App const control handleSubmit formState errors useForm const onSubmit data gt console log data return lt div className App gt lt form onSubmit handleSubmit onSubmit gt lt div className form control gt lt label gt Select Department of Interest lt label gt lt Controller name department control control rules required true render field gt lt Select field isMulti options departments gt gt errors department amp amp lt p className errorMsg gt This is a required field lt p gt lt div gt lt div className form control gt lt label gt lt label gt lt button type submit gt Submit lt button gt lt div gt lt form gt lt div gt Here s a Code Sandbox demo As you can see in the above code we re importing the Controller component at the top import useForm Controller from react hook form and control from useForm hook like this const control handleSubmit formState errors useForm Note we re not using the register function here Regular use of the react select library to allow multiple selection goes like this import Select from react select use lt Select isMulti options options gt But to use it with react hook form we need to wrap it in the Controller component lt Controller name department control control rules required true render field gt lt Select field isMulti options options gt gt Here we have to give a unique value for the name prop in the Controller The validations are added as a part of the rules prop and we use the render prop to render the Select dropdown How to Use Other Input Types with react hook formIn this section we ll see how to use radio buttons and checkboxes with react hook form Take a look at the below code import React from react import Button Form from react bootstrap import useForm from react hook form import styles css export default function App const register handleSubmit formState errors useForm const onSubmit data gt console log data return lt div className container gt lt form onSubmit handleSubmit onSubmit gt lt Form Group className mb controlId email gt lt Form Label gt Email lt Form Label gt lt Form Control type email placeholder Enter your email register email required Please enter your email pattern value message Please enter a valid email gt errors email amp amp lt p className errorMsg gt errors email message lt p gt lt Form Group gt lt Form Group className mb controlId gender gt lt Form Label gt Select Gender lt Form Label gt lt Form Check type radio label Male value male register gender required Please select your gender gt lt Form Check type radio label Female value female register gender gt errors gender amp amp lt p className errorMsg gt errors gender message lt p gt lt Form Group gt lt Form Group className mb controlId skills gt lt Form Label gt Select Your Skills lt Form Label gt lt Form Check type checkbox label JavaScript value JavaScript register skills required Please select at least one skill gt lt Form Check type checkbox label React value react register skills gt lt Form Check type checkbox label Node js value nodejs register skills gt lt Form Check type checkbox label Angular value angular register skills gt errors skills amp amp lt p className errorMsg gt errors skills message lt p gt lt Form Group gt lt label gt lt label gt lt Button type submit variant primary gt Submit lt Button gt lt form gt lt div gt Here s a Code Sandbox demo In the above code I m using react bootstrap to make the UI look good so Form Check is a react bootstrap component The main point you need to remember is that we ve not given the same names for the register function for a group of radio buttons and checkboxes like this lt Form Check type radio label Male value male register gender required Please select your gender gt lt Form Check type radio label Female value female register gender gt In the above code we ve given gender as the name for both the radio buttons and skills as the name for all the checkboxes as shown below lt Form Check type checkbox label JavaScript value JavaScript register skills required Please select at least one skill gt lt Form Check type checkbox label React value react register skills gt lt Form Check type checkbox label Node js value nodejs register skills gt lt Form Check type checkbox label Angular value angular register skills gt Also note that the required field validation is added only for the first radio button or checkbox Because we re using the same name we don t need to add the same validation to each radio button or checkbox How to Set Initial Values for Radio Buttons And CheckboxesSometimes we may have pre selected radio buttons or checkboxes which we need to display on page load in such a case we can again use the defaultValues option from for the useForm hook Take a look at the below code import React from react import Button Form from react bootstrap import useForm from react hook form import styles css const initialValues gender male skills JavaScript true react false nodejs true angular false export default function App const register handleSubmit formState errors useForm defaultValues gender initialValues gender skills Object keys initialValues skills filter item gt initialValues skills item true const onSubmit data gt console log data return lt div className container gt lt form onSubmit handleSubmit onSubmit gt lt Form Group className mb controlId email gt lt Form Label gt Email lt Form Label gt lt Form Control type email placeholder Enter your email register email required Please enter your email pattern value message Please enter a valid email gt errors email amp amp lt p className errorMsg gt errors email message lt p gt lt Form Group gt lt Form Group className mb controlId gender gt lt Form Label gt Select Gender lt Form Label gt lt Form Check type radio label Male value male register gender required Please select your gender gt lt Form Check type radio label Female value female register gender gt errors gender amp amp lt p className errorMsg gt errors gender message lt p gt lt Form Group gt lt Form Group className mb controlId skills gt lt Form Label gt Select Your Skills lt Form Label gt lt Form Check type checkbox label JavaScript value JavaScript register skills required Please select at least one skill gt lt Form Check type checkbox label React value react register skills gt lt Form Check type checkbox label Node js value nodejs register skills gt lt Form Check type checkbox label Angular value angular register skills gt errors skills amp amp lt p className errorMsg gt errors skills message lt p gt lt Form Group gt lt label gt lt label gt lt Button type submit variant primary gt Submit lt Button gt lt form gt lt div gt Here s a Code Sandbox demo In the above code we have an initialValues object which contains the values we want to set on the initial page load const initialValues gender male skills JavaScript true react false nodejs true angular false As we can have multiple skills skills is an object as shown above So we want to show the radio button selected if its value is male and we want to show only those checkboxes selected for which the value is true in the skills object Therefore for the defaultValues option we re looping over the skills object using the filter method to find out the skills for which the value is true as shown below const register handleSubmit formState errors useForm defaultValues gender initialValues gender skills Object keys initialValues skills filter item gt initialValues skills item true As the JavaScript and nodejs values are true the skills array after the filter method will become JavaScript nodejs so the defaultValues object will look like this useForm defaultValues gender male skills JavaScript nodejs Therefore when the page is loaded only the male gender and the JavaScript and Node js skills will be selected checked by default Note that the casing used in the skills object has to match with the value specified for the checkbox So even though the label for checkbox is Node js it s value is nodejs so we re using nodejs as the key in the initialValues object Below is the demo of how it looks on page load And that s it You ve learned how to use react hook form to more easily build complex forms in React Thanks for Reading If you want to learn Redux in detail from scratch and build apps along with the complete food ordering app check out my Mastering Redux course In the course you will learn Basic and advanced ReduxHow to manage the complex state of array and objectsHow to use multiple reducers to manage complex redux stateHow to debug a Redux applicationHow to use Redux in React using the react redux library to make your app reactive How to use the redux thunk library to handle async API callsBuild different apps using Reduxand much more Finally we ll build a complete food ordering app from scratch with stripe integration for accepting payments and deploy it to production Want to stay up to date with regular content regarding JavaScript React Node js Follow me on LinkedIn |
2022-11-05 05:39:47 |
| 海外ニュース |
Japan Times latest articles |
U.S.-China friction gives Kim Jong Un the freedom to fire away |
https://www.japantimes.co.jp/news/2022/11/05/asia-pacific/north-korea-un-sanctions-china-russia/
|
U S China friction gives Kim Jong Un the freedom to fire awayNorth Korea s unprecedented barrage of missiles is underscoring the cost of Washington s tensions with Beijing since China has shown little appetite for more sanctions |
2022-11-05 14:06:16 |
| ニュース |
BBC News - Home |
Rugby World Cup: Canada 19-26 England - Red Roses reach final |
https://www.bbc.co.uk/sport/rugby-union/63522559?at_medium=RSS&at_campaign=KARANGA
|
canada |
2022-11-05 05:43:07 |
| ビジネス |
東洋経済オンライン |
謝罪の場面を好機に変える人が実践していること 相手が不機嫌なときこそ好印象を残すチャンス | リーダーシップ・教養・資格・スキル | 東洋経済オンライン |
https://toyokeizai.net/articles/-/629235?utm_source=rss&utm_medium=http&utm_campaign=link_back
|
東洋経済オンライン |
2022-11-05 14:30:00 |
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