to update the complete object properties by using useState
pass textbox target value onchange event and change object properties using hooks
function ExampleObjectHooks() {
const [name, setname] = useState({ first: '', last: '' });
const onInputNameChange = (e) => {
setname({ first: e.target.value, last: e.target.value });
console.log(name);
}
return (
<div>
<form>
<input type="text" onChange={(e) => onInputNameChange(e)} ></input>
<input type="text" onChange={e => onInputNameChange(e)} ></input>
</form>
{name.first}{name.last}
</div>
);
}
Add an name attribute to each input field, and update the state using the name (key in the code). Node that you need to merge the state of each field by yourself. To so spread the previous state, and override the field you've just updated.
const { useState } = React;
function ExampleObjectHooks() {
const [name, setname] = useState({ first: '', last: '' });
const onInputNameChange = ({ target }) => {
const { name: key, value } = target;
setname(state => ({
...state,
[key]: value
}));
};
return (
<div>
<form>
<input name="first" type="text" onChange={onInputNameChange} ></input>
<input name="last" type="text" onChange={onInputNameChange} ></input>
</form>
{name.first} {name.last}
</div>
);
}
ReactDOM.render(
<ExampleObjectHooks />,
root
);
<script crossorigin src="https://unpkg.com/react#17/umd/react.development.js"></script>
<script crossorigin src="https://unpkg.com/react-dom#17/umd/react-dom.development.js"></script>
<div id="root"></div>
Related
Goal:
Retrieve data 'smartphones', by API, and apply it as a default selection in the input radio component for the react hook form.
Problem:
The code do not work that makes smartphones as a preselection in the input radio button.
However, if I make a change by using hard coding, it works but hard coding do not solve the case.
I don't know how to solve it.
Info:
*Using React TS and React hook form.
*Newbie in react TS and hook form.
Stackblitz:
https://stackblitz.com/edit/react-ts-z9cnzl
Thank you!
import React, { useState } from 'react';
import { useForm } from 'react-hook-form';
import './style.css';
type FormValues = {
lastName: string;
favShow: string;
};
export default function App() {
const [category, setCategory] = useState('');
React.useEffect(() => {
async function FetchData() {
var data = await fetch('https://dummyjson.com/products/1').then((res) => {
return res.json();
});
console.log(data.category);
setCategory(data.category);
}
FetchData();
}, []);
const [data, setData] = useState(null);
const { register, handleSubmit } = useForm<FormValues>({
defaultValues: {
lastName: 'asaaaaaaf',
favShow: category,
//favShow: 'smartphones',
},
});
const onSubmit = (data) => {
setData(data);
console.log('asdf');
};
return (
<React.Fragment>
<form onSubmit={handleSubmit(onSubmit)} className="form-container">
<h1 className="form-heading">React Hook Form Example</h1>
<input
{...register('lastName', { required: true })}
className="form-control"
type="text"
placeholder="Last name"
maxLength={15}
name="lastName"
/>
<br />
<br />
<label htmlFor="ted-lasso">
<input
{...register('favShow', { required: true })}
type="radio"
name="favShow"
value="smartphones"
id="smartphones"
/>{' '}
smartphones
</label>
<label htmlFor="got">
<input
{...register('favShow', { required: true })}
type="radio"
name="favShow"
value="GOT"
id="got"
/>
GOT
</label>
<br />
<br />
<button className="submit-btn" type="submit">
Submit
</button>
</form>
{data && <p className="submit-result">{JSON.stringify(data)}</p>}
</React.Fragment>
);
}
I got some help and the solution is:
Stackblitz:
https://stackblitz.com/edit/react-ts-m2s6ev?file=index.tsx
import React, { useState } from 'react';
import { useForm } from 'react-hook-form';
import './style.css';
type FormValues = {
lastName: string;
favShow: string;
};
export default function App() {
const [category2, setCategory2] = useState();
const [data, setData] = useState(null);
const { register, handleSubmit, resetField } = useForm<FormValues>({
defaultValues: {
lastName: '',
favShow: '',
},
});
React.useEffect(() => {
async function FetchData() {
var data = await fetch('https://dummyjson.com/products/1').then((res) => {
return res.json();
});
setCategory2(data);
}
FetchData();
}, []);
React.useEffect(() => {
if (category2) {
const obj = JSON.parse(JSON.stringify(category2));
console.log(obj);
resetField('lastName', { defaultValue: obj.discountPercentage });
resetField('favShow', { defaultValue: obj.category });
}
}, [resetField, category2]);
const onSubmit = (data) => {
setData(data);
};
return (
<React.Fragment>
<form onSubmit={handleSubmit(onSubmit)} className="form-container">
<h1 className="form-heading">React Hook Form Example</h1>
<input
{...register('lastName', { required: true })}
className="form-control"
type="text"
placeholder="Last name"
maxLength={15}
name="lastName"
/>
<br />
<br />
<label htmlFor="ted-lasso">
<input
{...register('favShow', { required: true })}
type="radio"
name="favShow"
value="smartphones"
id="smartphones"
/>{' '}
smartphones
</label>
<label htmlFor="got">
<input
{...register('favShow', { required: true })}
type="radio"
name="favShow"
value="GOT"
id="got"
/>
GOT
</label>
<br />
<br />
<button className="submit-btn" type="submit">
Submit
</button>
</form>
{data && <p className="submit-result">{JSON.stringify(data)}</p>}
</React.Fragment>
);
}
I am trying to call Apollo Mutation Hook on form submit to create a new record in the database.
export default function NewJobForm() {
const { loading, error, data } = useQuery(GET_LOC_CAT_TYPE_QUERY);
const [newJob] = useMutation(NEW_JOB_MUTATION);
const [remote, setRemote] = useState(false);
const editorRef = useRef(null);
const log = () => {
if (editorRef.current) {
console.log(editorRef.current.getContent());
}
};
let initialFormValues = {
companyName: '',
title: '',
};
const JobSchema = yup.object({
companyName: yup.string().required('Please enter the company name.'),
title: yup.string().required('Please enter the job title.'),
});
let formValidate = (values) => {
console.log(values);
const errors = {};
return errors;
};
let handleError = (field, actions) => {
field.forEach((data) => {
let field = data.param;
switch (field) {
// case 'name':
// actions.setFieldError('name', data.msg);
// break;
default:
break;
}
});
};
let formSubmit = async (values, actions) => {
console.log(values);
newJob({ variables: values });
};
return (
<>
<Formik
validationSchema={JobSchema}
validate={(values) => formValidate(values)}
onSubmit={(values, actions) => formSubmit(values, actions)}
enableReinitialize={true}
initialValues={initialFormValues}
validateOnChange={true}
validateOnBlur={false}
>
{({ handleSubmit, setFieldValue, values }) => (
<form noValidate onSubmit={handleSubmit}>
<div className="space-y-8 divide-y divide-gray-200">
<div>
<div>
<h3 className="text-lg font-medium leading-6 text-gray-900">
Job Details
</h3>
<p className="mt-1 text-sm text-gray-500">
This information will be displayed
publicly so be careful what you share.
</p>
</div>
<div className="grid grid-cols-1 mt-6 gap-y-6 gap-x-4 sm:grid-cols-6">
<div className="sm:col-span-4">
<TextInput
label="Company Name"
id="companyName"
name="companyName"
type="text"
placeholder="eg: Google"
helpText="Please Enter the name of the company"
/>
</div>
<div className="sm:col-span-4">
<TextInput
label="Job Title"
id="title"
name="title"
type="text"
/>
</div>
</div>
</div>
</div>
</form>
)}
</Formik>
</>
);
}
On Form Submit the console.log displays the message but the mutation network call does not seem to get triggered.
Here I am getting an error of handleSubmit function because ,here I am using this syntax 'function PostForm () ' instead of 'class PostForm extends Component {}',so what needs to be changed in order to work with handlesubmit function.
function PostForm () {
handleSubmit = (e) => {
e.preventDefault();
const title = this.getTitle.value;
const message = this.getMessage.value;
const data = {
id: new Date(),
title,
message
}
console.log(data)
}
return (
<div>
<h1>Create Post</h1>
<form onSubmit={this.handleSubmit}>
<input required type="text" ref={(input)=>this.getTitle = input}
placeholder="Enter Post Title"/>
<br /><br />
<textarea required rows="5" ref={(input)=>this.getMessage = input} cols="28"
placeholder="Enter Post" />
<br /><br />
<button>Post</button>
</form>
</div>
);
}
export default PostForm;
Since it's the function component you need to define handleSubmit as a function.
For example
const handleSubmit = (e) => {
...
}
I am trying create a simple crud system with react redux and form-redux.
The code below but does not work and gives error.
First I created an action for update and then created a reducer for that.
And then created component to use the action.
Let me know how to get this to work.
//-------------action--------------
export const EDIT_POST = 'EDIT_POST';
export const editPost = (id) => {
const request = axios.put(`${BOOK_URL}/books/${id}`);
return {
type: EDIT_POST,
payload: id,
}
};
//---------------- reducer-----------------
case EDIT_POST: {
return {...state, post: action.payload.data}
}
//----------------route--------------
<Route path='/posts/edit/:id' component={PostEdit}/>
//-------------------PostEdit---------------
class PostEdit extends Component {
componentDidMount = () => {
this.props.editPost(this.props.match.params.id);
console.log(this.props.editPost(this.props.match.params.id));
};
renderField = field => {
const {meta: {touched, error}} = field;
const className = `form-group ${touched && error ? 'has-danger' : ''}`;
return (
<div className='has-danger'>
<label>{field.label}</label>
<input type="text" {...field.input} className="form-control"/>
<div className="text-help">
{touched ? error : ''}
</div>
</div>
);
};
render() {
const {handleSubmit} = this.props;
return (
<form onSubmit={handleSubmit(this.onSubmitForm)}>
<Field name="title" label="Title" component={this.renderField}/>
<Field name="author" label="Author" component={this.renderField}/>
<Field name="description" label="Description" component={this.renderField}/>
<Field name="publicationDate" label="PublicationDate" component={this.renderField}/>
<button type='submit' className="btn btn-primary">Submit</button>
<Link to='/' className='btn btn-danger'>Cancel</Link>
</form>
);
}
}
export default reduxForm({
form :'updateForm'
})(connect(null, {editPost})(PostEdit));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
Could you tell what error you are getting?
You have to change your action like
export const fetchPosts = () => {
return (dispatch) => {
axios.get(`${BOOK_URL}/books`).then((response) => {
return dispatch({
type: FETCH_POSTS,
payload: // your response here
});
})
}
}
I have this form, and I would like to send these values. I know we have to use setState() to store data but how does it work for input type="hidden"?
First question: How to store input hidden to setState ?
Second question: How to serialize data like form.serialize() ?
Third question: How to send these serialize values? Ajax or Axios, who is the better?
Here is the code:
handleSubmit(e) {
e.preventDefault();
/**
$.ajax({
url: "post.php",
type: "POST",
data: DATA,
success:function(data) {
}
});
**/
}
<form onSubmit={this.handleSubmit}>
<input type="hidden" name="action" value="login" />
<input type="email" name="email_user" placeholder="Email" />
<input type="password" name="password_user" placeholder="Mot de passe" />
<button type="submit">Login</button>
</form>
The answer is complex for all your questions.
First of all, it depends on the task: if you just want to send asynchonous request to server on form submit, you don't need to use Component state. Here is a link to the relevant section of the documentation. And use refs to access inputs data.
class FormComponent extends React.Component {
constructor(props) {
super(props);
this.onSubmit = this.onSubmit.bind(this);
}
onSubmit(e) {
e.preventDefault();
// Send your ajax query via jQuery or Axios (I prefer Axios)
axios.get('your_url', {
params: {
action: this.actionInput.value,
email: this.emailInput.value,
password: this.passwordInput.value,
}
})
.then(function (response) {
console.log(response);
})
.catch(function (error) {
console.log(error);
});
}
render() {
return (
<form onSubmit={this.onSubmit}>
<input type="hidden" name="action" value="login"
ref={(input) => { this.actionInput = input }} />
<input type="email" name="email_user" placeholder="Email"
ref={(input) => { this.emailInput = input }}/>
<input type="password" name="password_user" placeholder="Mot de passe"
ref={(input) => { this.passwordInput = input }}/>
<button type="submit">Login</button>
</form>
);
}
}
All data can be stored on React's state, but if you still need to have inputs on your form you can do something like this:
const handleSubmit = e => {
e.preventDefault();
const inputs = Object.values(e.target)
.filter(c => typeof c.tagName === 'string' && c.tagName.toLowerCase() === 'input')
.reduce((acc, curr) => ({ ...acc, [curr.name]: curr.value }), {});
setFormVals({ ...formVals, ...inputs });
}
See the demo below:
const Demo = () => {
const [formValues] = React.useState({});
const handleSubmit = e => {
e.preventDefault();
const inputs = Object.values(e.target)
.filter(c => typeof c.tagName === 'string' && c.tagName.toLowerCase() === 'input')
.reduce((acc, curr) => ({ ...acc, [curr.name]: curr.value }), {});
console.log(inputs);
}
return (
<form onSubmit={handleSubmit}>
<input name="name" placeholder="Name" value={formValues.name} />
<input name="email" placeholder="Email" value={formValues.email} />
<input name="hiddenInput" value="hiddenValue" type="hidden" />
<button type="submit">Submit</button>
</form>
);
}
ReactDOM.render(<Demo />, document.getElementById('demo'));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.0/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.0/umd/react-dom.production.min.js"></script>
<div id="demo"></div>
If you know what the inputs that you need you can do something like this:
const Demo = () => {
const formRef = React.useRef(null);
const [formValues, setFormValues] = React.useState({});
const handleChange = e => {
setFormValues({
...formValues,
[e.target.name]: e.target.value,
});
}
const handleSubmit = e => {
e.preventDefault();
setFormValues({ ...formValues, hiddenInput: formRef.current.hiddenInput.value });
}
return (
<form onSubmit={handleSubmit} ref={formRef}>
<input name="name" placeholder="Name" value={formValues.name} onChange={handleChange} />
<input name="email" placeholder="Email" value={formValues.email} onChange={handleChange} />
<input name="hiddenInput" value="hiddenValue" type="hidden" />
<button type="submit">Submit</button>
<pre>{JSON.stringify(formValues, null, 2)}</pre>
</form>
);
}
ReactDOM.render(<Demo />, document.getElementById('demo'));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.0/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.0/umd/react-dom.production.min.js"></script>
<div id="demo"></div>
Answering your questions:
Since you know how to use component's state you may set the value as : <input type='text' value={this.state.foo} /> or even via props passing <input type='hidden' value={this.props.foo} />
You don't need to serialise anything at all. Use your component's local state or even a state container like Redux or Flux in order to pick the appropriate data. Take a look at this fairly simple example:
var SuperForm = React.createClass({
getInitialState() {
return {
name: 'foo',
email: 'baz#example.com'
};
},
submit(e){
e.preventDefault();
console.log("send via AJAX", this.state)
},
change(e,key){
const newState = {};
newState[key] = e.currentTarget.value;
this.setState(newState)
},
render: function() {
return (
<div>
<label>Name</label>
<input
onChange={(e) => this.change(e,'name')}
type="text"
value={this.state.name} />
<label>Email</label>
<input
onChange={(e) => this.change(e,'email')}
type="text"
value={this.state.email} />
<button onClick={this.submit}>Submit</button>
</div>
);
}});
Demo
AJAX is a set of web development techniques while Axios is a JavaScript framework. You may use jQuery, Axios or even vanilla JavaScript.