自定义React组件样式被Material-UI样式覆盖 [英] Custom React Component styles being overwritten by Material-UI style

问题描述

在以下位置的相关问题:

使用自定义组件:

  import从'react'导入React；从'g-react-component-library/dist'导入{gSelect}从'react-jss'导入{createUseStyles}const useStyles = createUseStyles({gSelect:{margin:"15px"}，例如:{float:"left"，显示:"inline-block"，whiteSpace:"nowrap"，verticalAlign:"top"}});函数App(){const classes = useStyles();返回 (< div className = {classes.example}>< div className = {classes.separator}>< div>选择:</div>< gSelect default = {1} classes = {{gSelect:classes.gSelect}} callback = {(e)=> {console.log(`$ {e} selected`)}}} options = {[1,2，3,4]}/>< gSelect default = {'One'} classes = {{gSelect:classes.gSelect}} callback = {(e)=> {console.log(`$ {e} selected`)}}} options = {[一个"，两个"，三个"，四个"]}/></div></div>);}导出默认应用程序； 

实际的自定义组件:

 从'react'导入React，{useState};从'@ material-ui/core'导入{Button，Select，FormControl，MenuItem，InputLabel}从'@ material-ui/styles'导入{makeStyles}从'prop-types'导入PropTypesconst gSelect =(props)=>{const [value，setValue] = useState();const handleChange =事件=>{props.callback(event.target.value);setValue(event.target.value);};const useStyles = makeStyles({选择: {边框:"solid#33333366 1px"，颜色:'rgba(51，51，51，0.66)'，fontWeight:"700"，backgroundColor:白色"，大纲:无"，borderRadius:'5px'，textAlign:'左'，宽度:"300px"，位置:相对"，}，根: {}});const classes = useStyles(props);返回 (< FormControl classes = {{root:classes.gSelect}}>< InputLabel id ="demo-simple-select-label"> {props.default}</InputLabel><选择value = {value} onChange = {handleChange} className = {classes.select}>{props.options.map((option，index)=> {return< MenuItem key = {`$ {option} _ $ {index}`} value = {option}> {option}</MenuItem>})}</选择></FormControl>)};gSelect.propTypes = {回调:PropTypes.func.isRequired，选项:PropTypes.array.isRequired，默认值:PropTypes.oneOfType([PropTypes.string，PropTypes.number]).是必须的，禁用:PropTypes.bool，宽度:PropTypes.string};模块.出口 = {g选择}; 

解决方案

您做错了. GSelect 应该接收这样的类:

应用内:

 < GSelect default = {1} classes = {{gSelect:classes.gSelect}} callback = {(e)=> {console.log(`$ {e} selected))}}选项= {[1,2,3,4]}/> 

然后在 GSelect 中输入

:

  const useStyles = createStyles(...您的样式);//在渲染器外部将此钩子称为工厂const GSelect = props =>{const classes = useStyles(props)<-props包含一个名为classes的对象，该对象的属性gselect已合并到您的对象中<选择value = {value} onChange = {handleChange} classes = {{root:classes.gSelect}}>} 

至于我最初关于在组件外部创建钩子的评论，我的意思是:

 //将其移出渲染器const useStyles = createUseStyles({gSelect:{margin:"15px"}，分隔符:{marginTop:"15px"}，例如:{float:"left"，显示:"inline-block"，whiteSpace:"nowrap"，verticalAlign:"top"}});函数App(){//在渲染器中使用它const classes = useStyles();...} 

通读本节和以下两个部分，过一会儿，它将单击:https://material-ui.com/styles/advanced/#overriding-styles-classes-prop

RELATED QUESTION OVER AT: Styles being overwritten by Material-UI style

I am create a component library on top of Material UI. Using JSS I'd like to be able to pass in styles to my custom components. However, I'm having issues with material-ui's root styles having higher specificity than what I'm passing in. I have tried overwriting the material-ui components default styles with the classes syntax but it simply creates another class with a similar name and higher specificity (makeStyles-root-51).

Consuming Custom Component:

import React from 'react';
import {gSelect} from 'g-react-component-library/dist'
import {createUseStyles} from 'react-jss'

const useStyles = createUseStyles({
    gSelect: {margin: "15px"},
    example: {float: "left", display: "inline-block", whiteSpace: 'nowrap', verticalAlign: 'top'}
});

function App() {

    const classes = useStyles();
    return (
        <div className={classes.example}>
            <div className={classes.separator}>
                <div>Selects:</div>
                <gSelect default={1} classes={{gSelect: classes.gSelect}} callback={(e)=>{console.log(`${e} selected`)}} options={[1,2,3,4]}/>
                <gSelect default={'One'} classes={{gSelect: classes.gSelect}} callback={(e)=>{console.log(`${e} selected`)}} options={["One", "Two", "Three", "Four"]}/>
            </div>
        </div>
    );
}

export default App;

The Actual Custom Component:

import React, {useState} from 'react';
import {Button, Select, FormControl, MenuItem, InputLabel} from '@material-ui/core'
import {makeStyles} from '@material-ui/styles'
import PropTypes from 'prop-types'

const gSelect = (props) => {

    const [value, setValue] = useState();

    const handleChange = event => {
        props.callback(event.target.value);
        setValue(event.target.value);
    };

    const useStyles = makeStyles({
        select: {
            border: 'solid #33333366 1px',
            color: 'rgba(51, 51, 51, 0.66)',
            fontWeight: '700',
            backgroundColor: 'white',
            outline: 'none',
            borderRadius: '5px',
            textAlign: 'left',
            width: '300px',
            position: 'relative',
        },
        root: {

        }
    });

    const classes = useStyles(props);
    return (
        <FormControl classes={{root: classes.gSelect}}>
        <InputLabel id="demo-simple-select-label">{props.default}</InputLabel>
        <Select value={value} onChange={handleChange} className={classes.select}>
            {props.options.map((option, index) => {
                return <MenuItem key={`${option}_${index}`} value={option}>{option}</MenuItem>
            })}
        </Select>
        </FormControl>
    )
};

gSelect.propTypes = {
    callback: PropTypes.func.isRequired,
    options: PropTypes.array.isRequired,
    default: PropTypes.oneOfType([
        PropTypes.string,
        PropTypes.number
    ]).isRequired,
    disabled: PropTypes.bool,
    width: PropTypes.string
};

module.exports = {
    gSelect
};

解决方案

You're doing it wrong. GSelect should receive classes like this:

In App:

<GSelect default={1} classes={{gSelect:classes.gSelect}} callback={(e)=>{console.log(`${e} selected`)}} options={[1,2,3,4]}/>

Then in GSelect:

const useStyles = createStyles(...your styles); // call this hook factory outside your render

const GSelect = props => {
   const classes = useStyles(props) <- props contains an object called classes with a property gselect that gets merged into yours

   <Select value={value} onChange={handleChange} classes={{root:classes.gSelect}}>
}

EDIT: As for my original comment about creating your hook outside of your component, I meant do this:

// move this outside of your render
    const useStyles = createUseStyles({
        gSelect: {margin: "15px"},
        separator: {marginTop: "15px"},
        example: {float: "left", display: "inline-block", whiteSpace: 'nowrap', verticalAlign: 'top'}
    });

function App() {
    // use it inside of your render
    const classes = useStyles();
    ...
}

Read through this section and the following two, after a while, it'll click: https://material-ui.com/styles/advanced/#overriding-styles-classes-prop

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