React + Redux-在表单组件中处理 CRUD 的最佳方法是什么？

小开

最佳答案

我找到了复本表格软件包。它真的做得很好！

因此，可以将复制与 React-Redux一起使用。

首先，您必须创建一个表单组件(显然) :

import React from 'react';
import { reduxForm } from 'redux-form';
import validateContact from '../utils/validateContact';


class ContactForm extends React.Component {
render() {
const { fields: {name, address, phone}, handleSubmit } = this.props;
return (
<form onSubmit={handleSubmit}>
<label>Name</label>
<input type="text" {...name}/>
{name.error && name.touched && <div>{name.error}</div>}


<label>Address</label>
<input type="text" {...address} />
{address.error && address.touched && <div>{address.error}</div>}


<label>Phone</label>
<input type="text" {...phone}/>
{phone.error && phone.touched && <div>{phone.error}</div>}


<button onClick={handleSubmit}>Submit</button>
</form>
);
}
}


ContactForm = reduxForm({
form: 'contact',                      // the name of your form and the key to
// where your form's state will be mounted
fields: ['name', 'address', 'phone'], // a list of all your fields in your form
validate: validateContact             // a synchronous validation function
})(ContactForm);


export default ContactForm;

然后，连接处理表单的组件:

import React from 'react';
import { connect } from 'react-redux';
import { initialize } from 'redux-form';
import ContactForm from './ContactForm.react';


class App extends React.Component {


handleSubmit(data) {
console.log('Submission received!', data);
this.props.dispatch(initialize('contact', {})); // clear form
}


render() {
return (
<div id="app">
<h1>App</h1>
<ContactForm onSubmit={this.handleSubmit.bind(this)}/>
</div>
);
}


}


export default connect()(App);

将还原形式的还原剂加入到组合的还原剂中:

import { combineReducers } from 'redux';
import { appReducer } from './app-reducers';
import { reducer as formReducer } from 'redux-form';


let reducers = combineReducers({
appReducer, form: formReducer // this is the form reducer
});


export default reducers;

验证器模块看起来像这样:

export default function validateContact(data, props) {
const errors = {};
if(!data.name) {
errors.name = 'Required';
}
if(data.address && data.address.length > 50) {
errors.address = 'Must be fewer than 50 characters';
}
if(!data.phone) {
errors.phone = 'Required';
} else if(!/\d{3}-\d{3}-\d{4}/.test(data.phone)) {
errors.phone = 'Phone must match the form "999-999-9999"'
}
return errors;
}

表单填写完成后，当您想要用一些值填充所有字段时，可以使用 initialize函数:

componentWillMount() {
this.props.dispatch(initialize('contact', {
name: 'test'
}, ['name', 'address', 'phone']));
}

填充表单的另一种方法是设置 initialValue。

ContactForm = reduxForm({
form: 'contact',                      // the name of your form and the key to
fields: ['name', 'address', 'phone'], // a list of all your fields in your form
validate: validateContact             // a synchronous validation function
}, state => ({
initialValues: {
name: state.user.name,
address: state.user.address,
phone: state.user.phone,
},
}))(ContactForm);

如果你有别的办法，请留言，谢谢。

小开

更新: 2018年，我将只使用 Formik(或类似 Formik 的库)

还有反应-还原-形式(一步一步来) ，它似乎用标记声明交换了还原形式的一些 javascript (& boilerplate)。看起来不错，但我还没用过。

自述文件中的剪切和粘贴:

import React from 'react';
import { createStore, combineReducers } from 'redux';
import { Provider } from 'react-redux';
import { modelReducer, formReducer } from 'react-redux-form';


import MyForm from './components/my-form-component';


const store = createStore(combineReducers({
user: modelReducer('user', { name: '' }),
userForm: formReducer('user')
}));


class App extends React.Component {
render() {
return (
<Provider store={ store }>
<MyForm />
</Provider>
);
}
}

./components/my-form-component.js

import React from 'react';
import { connect } from 'react-redux';
import { Field, Form } from 'react-redux-form';


class MyForm extends React.Component {
handleSubmit(val) {
// Do anything you want with the form value
console.log(val);
}


render() {
let { user } = this.props;


return (
<Form model="user" onSubmit={(val) => this.handleSubmit(val)}>
<h1>Hello, { user.name }!</h1>
<Field model="user.name">
<input type="text" />
</Field>
<button>Submit!</button>
</Form>
);
}
}


export default connect(state => ({ user: state.user }))(MyForm);

编辑: 比较

Response-redux-form 文档提供了与 redux-form 文档的比较:

Https://davidkpiano.github.io/react-redux-form/docs/guides/compare-redux-form.html

小开

对于那些不关心处理表单相关问题的庞大库的人，我建议使用 Redux-form-utils。

它可以为表单控件生成值并更改处理程序，生成表单的简化程序，方便的操作创建程序清除某些(或所有)字段，等等。

所有您需要做的就是在您的代码中组装它们。

通过使用 redux-form-utils，您最终将得到如下表单操作:

import { createForm } from 'redux-form-utils';


@createForm({
form: 'my-form',
fields: ['name', 'address', 'gender']
})
class Form extends React.Component {
render() {
const { name, address, gender } = this.props.fields;
return (
<form className="form">
<input name="name" {...name} />
<input name="address" {...address} />
<select {...gender}>
<option value="male" />
<option value="female" />
</select>
</form>
);
}
}

然而，这个库只能解决 C和 U的问题，对于 R和 D，可能需要一个更集成的 Table组件。

小开

对于那些希望创建完全受控的表单组件而不使用超大库的人来说，这是另一回事。

ReduxFormHelper -一个小型 ES6类，少于100行:

class ReduxFormHelper {
constructor(props = {}) {
let {formModel, onUpdateForm} = props
this.props = typeof formModel === 'object' &&
typeof onUpdateForm === 'function' && {formModel, onUpdateForm}
}


resetForm (defaults = {}) {
if (!this.props) return false
let {formModel, onUpdateForm} = this.props
let data = {}, errors = {_flag: false}
for (let name in formModel) {
data[name] = name in defaults? defaults[name] :
('default' in formModel[name]? formModel[name].default : '')
errors[name] = false
}
onUpdateForm(data, errors)
}


processField (event) {
if (!this.props || !event.target) return false
let {formModel, onUpdateForm} = this.props
let {name, value, error, within} = this._processField(event.target, formModel)
let data = {}, errors = {_flag: false}
if (name) {
value !== false && within && (data[name] = value)
errors[name] = error
}
onUpdateForm(data, errors)
return !error && data
}


processForm (event) {
if (!this.props || !event.target) return false
let form = event.target
if (!form || !form.elements) return false
let fields = form.elements
let {formModel, onUpdateForm} = this.props
let data = {}, errors = {}, ret = {}, flag = false
for (let n = fields.length, i = 0; i < n; i++) {
let {name, value, error, within} = this._processField(fields[i], formModel)
if (name) {
value !== false && within && (data[name] = value)
value !== false && !error && (ret[name] = value)
errors[name] = error
error && (flag = true)
}
}
errors._flag = flag
onUpdateForm(data, errors)
return !flag && ret
}


_processField (field, formModel) {
if (!field || !field.name || !('value' in field))
return {name: false, value: false, error: false, within: false}
let name = field.name
let value = field.value
if (!formModel || !formModel[name])
return {name, value, error: false, within: false}
let model = formModel[name]
if (model.required && value === '')
return {name, value, error: 'missing', within: true}
if (model.validate && value !== '') {
let fn = model.validate
if (typeof fn === 'function' && !fn(value))
return {name, value, error: 'invalid', within: true}
}
if (model.numeric && isNaN(value = Number(value)))
return {name, value: 0, error: 'invalid', within: true}
return {name, value, error: false, within: true}
}
}

它不能为您完成所有的工作，但是它可以方便地创建、验证和处理受控的表单组件。您可以直接将上面的代码复制粘贴到您的项目中，或者包含相应的库 -redux-form-helper(即插即用!).

怎么用

第一步是向 Redux 状态添加特定的数据，这些数据将表示表单的状态。这些数据将包括表单中每个字段的当前字段值以及错误标志集。

形态状态可以添加到现有的减速器中，也可以在单独的减速器中定义。

此外，还需要定义特定的操作，以启动表单状态的更新以及相应的操作创建者。

行动例子 :

export const FORM_UPDATE = 'FORM_UPDATE'


export const doFormUpdate = (data, errors) => {
return { type: FORM_UPDATE, data, errors }
}
...

减速器示例 :

...
const initialState = {
formData: {
field1: '',
...
},
formErrors: {
},
...
}


export default function reducer (state = initialState, action) {
switch (action.type) {
case FORM_UPDATE:
return {
...ret,
formData: Object.assign({}, formData, action.data || {}),
formErrors: Object.assign({}, formErrors, action.errors || {})
}
...
}
}

第二步也是最后一步是为我们的表单创建一个容器组件，并将其与各自的 Redux 状态和操作部分连接起来。

我们还需要定义一个表单模型，指定表单字段的验证。现在我们将 ReduxFormHelper对象实例化为组件的一个成员，并将表单模型和表单状态的回调分派更新传递给它。

然后，在组件的 render()方法中，我们必须分别用 processField()和 processForm()方法绑定每个字段的 onChange和表单的 onSubmit事件，并根据状态中的表单错误标志显示每个字段的错误块。

下面的例子使用了来自 Bootstrap 框架的 CSS。

容器组件示例 :

import React, {Component} from 'react';
import {connect} from 'react-redux'
import ReduxFormHelper from 'redux-form-helper'


class MyForm extends Component {
constructor(props) {
super(props);
this.helper = new ReduxFormHelper(props)
this.helper.resetForm();
}


onChange(e) {
this.helper.processField(e)
}


onSubmit(e) {
e.preventDefault()
let {onSubmitForm} = this.props
let ret = this.helper.processForm(e)
ret && onSubmitForm(ret)
}


render() {
let {formData, formErrors} = this.props
return (
<div>
{!!formErrors._flag &&
<div className="alert" role="alert">
Form has one or more errors.
</div>
}
<form onSubmit={this.onSubmit.bind(this)} >
<div className={'form-group' + (formErrors['field1']? ' has-error': '')}>
<label>Field 1 *</label>
<input type="text" name="field1" value={formData.field1} onChange={this.onChange.bind(this)} className="form-control" />
{!!formErrors['field1'] &&
<span className="help-block">
{formErrors['field1'] === 'invalid'? 'Must be a string of 2-50 characters' : 'Required field'}
</span>
}
</div>
...
<button type="submit" className="btn btn-default">Submit</button>
</form>
</div>
)
}
}


const formModel = {
field1: {
required: true,
validate: (value) => value.length >= 2 && value.length <= 50
},
...
}


function mapStateToProps (state) {
return {
formData: state.formData, formErrors: state.formErrors,
formModel
}
}


function mapDispatchToProps (dispatch) {
return {
onUpdateForm: (data, errors) => {
dispatch(doFormUpdate(data, errors))
},
onSubmitForm: (data) => {
// dispatch some action which somehow updates state with form data
}
}
}


export default connect(mapStateToProps, mapDispatchToProps)(MyForm)

演示