如何从反应中的子组件内部更改父组件的背景颜色，盖茨比
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【中文标题】如何从反应中的子组件内部更改父组件的背景颜色，盖茨比【英文标题】：How to change the background color of a parent component from inside a child component in react, gatsby 【发布时间】：2021-12-04 02:49:38 【问题描述】：我正在使用 react，gatsby，我有 2 个组件
const Landing = ( children ) =>
return (
<div className=container>
<div className=wrapper>
<ZoneButton zone='pink' icon='child' />
<ZoneButton zone='blue' icon='code' />
</div>
</div>
)
还有，
const ZoneButton = ( zone, icon ) =>
const colourPrimaryDict =
'pink': 'var(--pastel-pink-primary)',
'blue': 'var(--pastel-blue-primary)'
const colourSecondaryDict =
'pink': 'var(--pastel-pink-secondary)',
'blue': 'var(--pastel-blue-secondary)'
const svgDict =
'code': <svg aria-hidden="true" focusable="false" data-prefix="fas" data-icon="code" className="svg-inline--fa fa-code fa-w-20" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 640 512"><path fill="currentColor" d="M278.9 511.5l-61-17.7c-6.4-1.8-10-8.5-8.2-14.9L346.2 8.7c1.8-6.4 8.5-10 14.9-8.2l61 17.7c6.4 1.8 10 8.5 8.2 14.9L293.8 503.3c-1.9 6.4-8.5 10.1-14.9 8.2zm-114-112.2l43.5-46.4c4.6-4.9 4.3-12.7-.8-17.2L117 256l90.6-79.7c5.1-4.5 5.5-12.3.8-17.2l-43.5-46.4c-4.5-4.8-12.1-5.1-17-.5L3.8 247.2c-5.1 4.7-5.1 12.8 0 17.5l144.1 135.1c4.9 4.6 12.5 4.4 17-.5zm327.2.6l144.1-135.1c5.1-4.7 5.1-12.8 0-17.5L492.1 112.1c-4.8-4.5-12.4-4.3-17 .5L431.6 159c-4.6 4.9-4.3 12.7.8 17.2L523 256l-90.6 79.7c-5.1 4.5-5.5 12.3-.8 17.2l43.5 46.4c4.5 4.9 12.1 5.1 17 .6z"/></svg>,
'child': <svg aria-hidden="true" focusable="false" data-prefix="fas" data-icon="child" className="svg-inline--fa fa-child fa-w-12" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 384 512"><path fill="currentColor" d="M120 72c0-39.765 32.235-72 72-72s72 32.235 72 72c0 39.764-32.235 72-72 72s-72-32.236-72-72zm254.627 1.373c-12.496-12.497-32.758-12.497-45.254 0L242.745 160H141.254L54.627 73.373c-12.496-12.497-32.758-12.497-45.254 0-12.497 12.497-12.497 32.758 0 45.255L104 213.254V480c0 17.673 14.327 32 32 32h16c17.673 0 32-14.327 32-32V368h16v112c0 17.673 14.327 32 32 32h16c17.673 0 32-14.327 32-32V213.254l94.627-94.627c12.497-12.497 12.497-32.757 0-45.254z"/></svg>
return (
<div className=container style=
backgroundColor: colourPrimaryDict[zone],
color: colourSecondaryDict[zone]
onClick= /* What do I put here */ >
svgDict[icon]
</div>
)
如何才能点击 ZoneButton，然后更改 Landing 组件中容器 className 的背景颜色。
【问题讨论】：
【参考方案1】：你可以这样做：
const ZoneButton = ( zone, icon ) =>
let [colourPrimaryDict, setColourPrimaryDict] = React.useState(
'pink': 'var(--pastel-pink-primary)',
'blue': 'var(--pastel-blue-primary)'
)
let [colourSecondaryDict, setColourSecondaryDict] = React.useState(
'pink': 'var(--pastel-pink-secondary)',
'blue': 'var(--pastel-blue-secondary)'
)
const svgDict =
'code': <svg aria-hidden="true" focusable="false" data-prefix="fas" data-icon="code" className="svg-inline--fa fa-code fa-w-20" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 640 512"><path fill="currentColor" d="M278.9 511.5l-61-17.7c-6.4-1.8-10-8.5-8.2-14.9L346.2 8.7c1.8-6.4 8.5-10 14.9-8.2l61 17.7c6.4 1.8 10 8.5 8.2 14.9L293.8 503.3c-1.9 6.4-8.5 10.1-14.9 8.2zm-114-112.2l43.5-46.4c4.6-4.9 4.3-12.7-.8-17.2L117 256l90.6-79.7c5.1-4.5 5.5-12.3.8-17.2l-43.5-46.4c-4.5-4.8-12.1-5.1-17-.5L3.8 247.2c-5.1 4.7-5.1 12.8 0 17.5l144.1 135.1c4.9 4.6 12.5 4.4 17-.5zm327.2.6l144.1-135.1c5.1-4.7 5.1-12.8 0-17.5L492.1 112.1c-4.8-4.5-12.4-4.3-17 .5L431.6 159c-4.6 4.9-4.3 12.7.8 17.2L523 256l-90.6 79.7c-5.1 4.5-5.5 12.3-.8 17.2l43.5 46.4c4.5 4.9 12.1 5.1 17 .6z"/></svg>,
'child': <svg aria-hidden="true" focusable="false" data-prefix="fas" data-icon="child" className="svg-inline--fa fa-child fa-w-12" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 384 512"><path fill="currentColor" d="M120 72c0-39.765 32.235-72 72-72s72 32.235 72 72c0 39.764-32.235 72-72 72s-72-32.236-72-72zm254.627 1.373c-12.496-12.497-32.758-12.497-45.254 0L242.745 160H141.254L54.627 73.373c-12.496-12.497-32.758-12.497-45.254 0-12.497 12.497-12.497 32.758 0 45.255L104 213.254V480c0 17.673 14.327 32 32 32h16c17.673 0 32-14.327 32-32V368h16v112c0 17.673 14.327 32 32 32h16c17.673 0 32-14.327 32-32V213.254l94.627-94.627c12.497-12.497 12.497-32.757 0-45.254z"/></svg>
let changeColor = () =>
//Change your color here
setColourPrimaryDict(
'pink': 'var(--pastel-pink-primary)',
'blue': 'var(--pastel-blue-primary)'
)
return (
<div className=container style=
backgroundColor: colourPrimaryDict[zone],
color: colourSecondaryDict[zone]
onClick= () => changeColor() >
svgDict[icon]
</div>
)
点击时只需更改状态值。
【讨论】：
【参考方案2】：就是这么简单。您只需了解绕过组件中的道具的反应中发生了什么。这是一个小的 sn-p，以便更好地理解。
改变传入的props state值，由父组件发送或使用redux进行全局声明
父组件
function App()
const [data, setData] = useState("#fff")
return (
<div style=
backgroundColor: data
>
<Test setData=setData/>
</div>)
子组件
function Test(passedProps)
let setData = passedProps
return (<button onClick=() => setData("#f1f1f1") >click to change color</button>);
【讨论】：
【参考方案3】：试试这个
在父组件 (Landing) 中定义一个状态 (bgColor) 并将控制器 (setBgColor) 传递给子组件（按钮）。
import useState from "react";
const Landing = ( children ) =>
const [ bgColor, setBgColor ] = useState("blue");
return (
<div className=container style= backgroundColor: bgColor >
<div className=wrapper>
<ZoneButton zone='pink' icon='child' setBgColor=setBgColor/>
<ZoneButton zone='blue' icon='code' setBgColor=setBgColor/>
</div>
</div>
)
根据zone设置bgColor
const ZoneButton = ( zone, icon ) =>
const colourPrimaryDict =
'pink': 'var(--pastel-pink-primary)',
'blue': 'var(--pastel-blue-primary)'
const colourSecondaryDict =
'pink': 'var(--pastel-pink-secondary)',
'blue': 'var(--pastel-blue-secondary)'
const svgDict =
'code': <svg aria-hidden="true" focusable="false" data-prefix="fas" data-icon="code" className="svg-inline--fa fa-code fa-w-20" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 640 512"><path fill="currentColor" d="M278.9 511.5l-61-17.7c-6.4-1.8-10-8.5-8.2-14.9L346.2 8.7c1.8-6.4 8.5-10 14.9-8.2l61 17.7c6.4 1.8 10 8.5 8.2 14.9L293.8 503.3c-1.9 6.4-8.5 10.1-14.9 8.2zm-114-112.2l43.5-46.4c4.6-4.9 4.3-12.7-.8-17.2L117 256l90.6-79.7c5.1-4.5 5.5-12.3.8-17.2l-43.5-46.4c-4.5-4.8-12.1-5.1-17-.5L3.8 247.2c-5.1 4.7-5.1 12.8 0 17.5l144.1 135.1c4.9 4.6 12.5 4.4 17-.5zm327.2.6l144.1-135.1c5.1-4.7 5.1-12.8 0-17.5L492.1 112.1c-4.8-4.5-12.4-4.3-17 .5L431.6 159c-4.6 4.9-4.3 12.7.8 17.2L523 256l-90.6 79.7c-5.1 4.5-5.5 12.3-.8 17.2l43.5 46.4c4.5 4.9 12.1 5.1 17 .6z"/></svg>,
'child': <svg aria-hidden="true" focusable="false" data-prefix="fas" data-icon="child" className="svg-inline--fa fa-child fa-w-12" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 384 512"><path fill="currentColor" d="M120 72c0-39.765 32.235-72 72-72s72 32.235 72 72c0 39.764-32.235 72-72 72s-72-32.236-72-72zm254.627 1.373c-12.496-12.497-32.758-12.497-45.254 0L242.745 160H141.254L54.627 73.373c-12.496-12.497-32.758-12.497-45.254 0-12.497 12.497-12.497 32.758 0 45.255L104 213.254V480c0 17.673 14.327 32 32 32h16c17.673 0 32-14.327 32-32V368h16v112c0 17.673 14.327 32 32 32h16c17.673 0 32-14.327 32-32V213.254l94.627-94.627c12.497-12.497 12.497-32.757 0-45.254z"/></svg>
return (
<div className=container style=
backgroundColor: colourPrimaryDict[zone],
color: colourSecondaryDict[zone]
onClick=() => setBgColor(zone)>
svgDict[icon]
</div>
)
如果需要，您可以使用它来更改className。
【讨论】：
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