react动态生成input、select标签以及思路总结

见贤思齐焉,见不贤内自省

首先我们需要有一个数据结构,首先需要是一个数组,当然字段都可以自己定义,我这里没按照规范起名。
核心在于将数据整理好,字段梳理清楚,将state中用到的字段动态插入,提醒必填项也要动态遍历。
比如:

   let stateOptions = [{
                value: 'name',
                title: '允许传送',
                type: 'inp',
                isrequird: true
            }, {
                value: 'age',
                title: '允许请求',
                type: 'sel',
                isrequird: false
            }, {
                value: 'runing',
                title: '允许递归',
                type: 'inp',
                isrequird: true
            }]

value标识当前字段的key
title标识当前input或者select前面的名称
type标识是input还是select
isrequird标识当前是否是必填

这里只写这几项,这是我在写项目之前的一个小样。所以并没有考虑的很全面。

我们需要在页面挂载的时候,将变量动态的添加到状态机中:

 componentDidMount() {
        setTimeout(() => {
            let stateOptions = [{
                value: 'name',
                title: '允许传送',
                type: 'inp',
                isrequird: true
            }, {
                value: 'age',
                title: '允许请求',
                type: 'sel',
                isrequird: false
            }, {
                value: 'runing',
                title: '允许递归',
                type: 'inp',
                isrequird: true
            }]
            //创建一个临时对象 添加属性方便
            let newObkj = {}
            //初始化在view层需要用到的变量 放置state中
            stateOptions.map(i => {
                // 到时候换成字段标识
                if (i.value === 'age') {
                    newObkj[i.value] = []
                } else {
                    newObkj[i.value] = ''
                }
            })
            //使用解构赋值的形式直接将生成好的变量对象放置state中
            this.setState({
                // 解构到state中
                ...newObkj,
                myOptionList: stateOptions
            })
        })

    }

页面使用:

    render() {
        let { myOptionList, } = this.state
        // 随机生成options 数组
        const children = [];
        for (let i = 10; i < 36; i++) {
            children.push({ title: `${i.toString(36) + i}`, key: `${i.toString(36) + i}` });
        }
        // 必填标识  * 
        let isrequird = <a href="#!" style={{ color: '#ff7875', fontSize: '12px', marginTop: '8px', marginLeft: '8px' }}>*</a>
        return (
            <div className="context" >
                <div className="search"  >
                    <div className="search-input">
                        <p className="search-input-title">{'XX设置'}</p>
                        <div className="search-input-row" style={{ marginTop: '20px' }} style={{ flexDirection: "column" }}>
                            <span style={{ marginRight: '6%' }}></span>
                            <div style={{ textAlign: 'right', whiteSpace: 'nowrap', display: 'flex', flexDirection: "column", justifyContent: 'space-between' }}>
                                {
                                    myOptionList.map((item, index) => {
                                        return (
                                            item.type === 'inp' ?
                                                <div key={index} style={{ display: 'flex', marginBottom: '10px' }}>
                                                    <Input value={this.state[`${item.value}`]} title={`${item.title}`} onChange={(e) => this.inputName(`${item.value}`, e.target.value)} />
                                                    {item.isrequird ? isrequird : ''}
                                                </div>
                                                :
                                                item.type === 'sel' ?
                                                    <div key={index} className="search-input-row-element" style={{ marginBottom: '10px', display: 'flex', marginLeft: '0px' }}>
                                                        <Select
                                                            title={`${item.title}`}
                                                            showArrow={true}
                                                            mode="tags"
                                                            style={{}}
                                                            value={this.state[`${item.value}`]}
                                                            onChange={(e) => { this.inputName(`${item.value}`, e) }}
                                                            tokenSeparators={[',']}
                                                            options={children}
                                                            keyField="key"
                                                            valueField="key"
                                                            titleField="title"
                                                            dropdownMatchSelectWidth={true}
                                                        ></Select>
                                                        {item.isrequird ? isrequird : ''}
                                                    </div>
                                                    : ''
                                        )
                                    })
                                }
                            </div>
                        </div >
                    </div>
                </div>
                <div className="device_search" style={{ marginLeft: "0px", marginBottom: '20px', marginTop: '20px', textAlign: "center" }}>
                    <Button Type="noIcon" title="测试按钮" onClick={() => this.bottomBtnClick('1')}></Button>
                    <span style={{ marginRight: '20px' }}></span>
                    <Button Type="noIcon" color="#E6A23C" title="返回" onClick={() => this.bottomBtnClick('2')}></Button>
                </div>
            </div>
        )
    }

上方使用三木运算判断标识显示input组件还是select组件,是否显示必填的标识。
动态生成了select中的options。
input和select输入获取值放置统一方法中:

    // 输入框 输入
    inputName = (type, e) => {
        let tempData = {}
        if (e.target) {
            tempData[type] = e.target.value
        } else {
            tempData[type] = e
        }
        this.setState(tempData)
    }

点击提交的时候动态遍历所有的必输项,没输入则提示:

    bottomBtnClick = () => {
        let { myOptionList } = this.state
        // 动态遍历 必输项
        // 提交前判断格式中是否有必填项
        for (let key in myOptionList) {
            if (myOptionList[key].isrequird) {
                if (this.state[`${myOptionList[key].value}`] === '' || this.state[`${myOptionList[key].value}`].toString() === '[]') {
                    message.error(`请将${myOptionList[key].title}填写完整!`);
                    return false
                }

            }
        }
        console.log(this.state)
    }

全部代码:里面所有的都是使用antd组件写的,所有只看思路就ok

import React from 'react'
import { message } from 'antd';
import { withRouter } from 'react-router-dom'
import Button from '../../component/Button';
import Select from '../../component/Select';
import Input from '../../component/Input';

class Options extends React.Component {
    state = {
        myOptionList: [],
    }
    componentDidMount() {
        setTimeout(() => {
            let stateOptions = [{
                value: 'name',
                title: '允许传送',
                type: 'inp',
                isrequird: true
            }, {
                value: 'age',
                title: '允许请求',
                type: 'sel',
                isrequird: false
            }, {
                value: 'runing',
                title: '允许递归',
                type: 'inp',
                isrequird: true
            }]
            let newObkj = {}
            stateOptions.map(i => {
                // 到时候换成字段标识
                if (i.value === 'age') {
                    newObkj[i.value] = []
                } else {
                    newObkj[i.value] = ''
                }
            })
            this.setState({
                // 解构到state中
                ...newObkj,
                myOptionList: stateOptions
            })
        })

    }
    // 输入框 输入
    inputName = (type, e) => {
        let tempData = {}
        if (e.target) {
            tempData[type] = e.target.value
        } else {
            tempData[type] = e
        }
        this.setState(tempData)
    }

    bottomBtnClick = () => {
        let { myOptionList } = this.state
        // 动态遍历 必输项
        // 提交前判断格式中是否有必填项
        for (let key in myOptionList) {
            if (myOptionList[key].isrequird) {
                if (this.state[`${myOptionList[key].value}`] === '' || this.state[`${myOptionList[key].value}`].toString() === '[]') {
                    message.error(`请将${myOptionList[key].title}填写完整!`);
                    return false
                }

            }
        }
        console.log(this.state)
    }
    render() {
        let { myOptionList, } = this.state
        // 随机生成options 数组
        const children = [];
        for (let i = 10; i < 36; i++) {
            children.push({ title: `${i.toString(36) + i}`, key: `${i.toString(36) + i}` });
        }
        // 必填标识  * 
        let isrequird = <a href="#!" style={{ color: '#ff7875', fontSize: '12px', marginTop: '8px', marginLeft: '8px' }}>*</a>
        return (
            <div className="context" >
                <div className="search"  >
                    <div className="search-input">
                        <p className="search-input-title">{'XX设置'}</p>
                        <div className="search-input-row" style={{ marginTop: '20px' }} style={{ flexDirection: "column" }}>
                            <span style={{ marginRight: '6%' }}></span>
                            <div style={{ textAlign: 'right', whiteSpace: 'nowrap', display: 'flex', flexDirection: "column", justifyContent: 'space-between' }}>
                                {
                                    myOptionList.map((item, index) => {
                                        return (
                                            item.type === 'inp' ?
                                                <div key={index} style={{ display: 'flex', marginBottom: '10px' }}>
                                                    <Input value={this.state[`${item.value}`]} title={`${item.title}`} onChange={(e) => this.inputName(`${item.value}`, e.target.value)} />
                                                    {item.isrequird ? isrequird : ''}
                                                </div>
                                                :
                                                item.type === 'sel' ?
                                                    <div key={index} className="search-input-row-element" style={{ marginBottom: '10px', display: 'flex', marginLeft: '0px' }}>
                                                        <Select
                                                            title={`${item.title}`}
                                                            showArrow={true}
                                                            mode="tags"
                                                            style={{}}
                                                            value={this.state[`${item.value}`]}
                                                            onChange={(e) => { this.inputName(`${item.value}`, e) }}
                                                            tokenSeparators={[',']}
                                                            options={children}
                                                            keyField="key"
                                                            valueField="key"
                                                            titleField="title"
                                                            dropdownMatchSelectWidth={true}
                                                        ></Select>
                                                        {item.isrequird ? isrequird : ''}
                                                    </div>
                                                    : ''
                                        )
                                    })
                                }
                            </div>
                        </div >
                    </div>
                </div>
                <div className="device_search" style={{ marginLeft: "0px", marginBottom: '20px', marginTop: '20px', textAlign: "center" }}>
                    <Button Type="noIcon" title="测试按钮" onClick={() => this.bottomBtnClick('1')}></Button>
                    <span style={{ marginRight: '20px' }}></span>
                    <Button Type="noIcon" color="#E6A23C" title="返回" onClick={() => this.bottomBtnClick('2')}></Button>
                </div>
            </div>
        )
    }
}
export default withRouter(Options)

react动态生成input、select标签以及思路总结_第1张图片
react动态生成input、select标签以及思路总结_第2张图片

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