Javascript 似乎无法更改组件的道具
我有以下两个组件: 为了便于阅读,我将跳过这个问题中的导入和导出 Explorer.jsJavascript 似乎无法更改组件的道具,javascript,reactjs,react-props,Javascript,Reactjs,React Props,我有以下两个组件: 为了便于阅读,我将跳过这个问题中的导入和导出 Explorer.js const Explorer = () => { const [selected, setSelected] = useState('C'); let dirArr = [ <Program key={"C"} name="C" isSelected={true}/>, <Program key={"D"} name="D" is
const Explorer = () => {
const [selected, setSelected] = useState('C');
let dirArr = [
<Program key={"C"} name="C" isSelected={true}/>,
<Program key={"D"} name="D" isSelected={false}/>
];
const changeSelection = (newSelection) => {
if (selected !== newSelection){
dirArr = dirArr.map((el) => {
switch (el.props.name){
case newSelection:
case selected:
return <Program key={el.props.name} name={el.props.name} isSelected={!el.props.isSelected}/>
default:
return el
}
});
}
setSelected(newSelection);
}
const handleClick = (e) => {
//TODO: Make sure only <Program> allowed
changeSelection(e.target.parentNode.firstElementChild.innerHTML);
}
return (
<div onClick={handleClick}>
{dirArr}
</div>
)
}
const Program = (props) => {
const [name, setName] = useState(props.name);
const [size, setSize] = useState(0);
const [date, setDate] = useState('01.01.75');
const selectedDeterminer = () => {
return props.isSelected ? { background: 'blue'} : {}
}
return (
<div style={selectedDeterminer()}>
<section className="program-name">{name}</section>
<section className="program-size">{size}</section>
<section className="program-date">{date}</section>
</div>
)
}
然后是Program.js
const Explorer = () => {
const [selected, setSelected] = useState('C');
let dirArr = [
<Program key={"C"} name="C" isSelected={true}/>,
<Program key={"D"} name="D" isSelected={false}/>
];
const changeSelection = (newSelection) => {
if (selected !== newSelection){
dirArr = dirArr.map((el) => {
switch (el.props.name){
case newSelection:
case selected:
return <Program key={el.props.name} name={el.props.name} isSelected={!el.props.isSelected}/>
default:
return el
}
});
}
setSelected(newSelection);
}
const handleClick = (e) => {
//TODO: Make sure only <Program> allowed
changeSelection(e.target.parentNode.firstElementChild.innerHTML);
}
return (
<div onClick={handleClick}>
{dirArr}
</div>
)
}
const Program = (props) => {
const [name, setName] = useState(props.name);
const [size, setSize] = useState(0);
const [date, setDate] = useState('01.01.75');
const selectedDeterminer = () => {
return props.isSelected ? { background: 'blue'} : {}
}
return (
<div style={selectedDeterminer()}>
<section className="program-name">{name}</section>
<section className="program-size">{size}</section>
<section className="program-date">{date}</section>
</div>
)
}
const程序=(道具)=>{
const[name,setName]=useState(props.name);
const[size,setSize]=useState(0);
const[date,setDate]=useState('01.01.75');
常量selectedDeterminer=()=>{
返回props.isSelected?{background:'blue'}:{}
}
返回(
{name}
{size}
{date}
)
}
在控制台日志记录时,我确信我选择的是元素名称或el.props.isSelected
正确,它只是在返回的映射上,似乎不会影响结果
我想问题在于您使用的是static
isSelected
prop-您需要使用stateselected
变量:
let dirArr = [
<Program key={"C"} name="C" isSelected={selected === 'C'}/>,
<Program key={"D"} name="D" isSelected={selected === 'D'}/>
];
让dirArr=[
,
];
在handleClick函数上,这个e.target.parentNode.firstElementChild.innerHTML
?@nehasoni在程序.js
{name}
中,name相当于props.name
,因此在实际示例中,单击“D”组件的任意位置,结果将是“D”
是的,这为我解决了这个问题,不过为了从中吸取教训,你能详细说明一下你的答案吗?因为从技术上讲,虽然赋值是静态的,但我仍在更改map()
函数中的值。所以我有点困惑为什么它不起作用请看一看我做的这个例子,它更好,更通用的实现-。就这样看吧——react中显示的一切都应该基于某种状态,你应该通过改变这种状态来改变它的外观,这样你就有了唯一的真相来源。所以,您只需要更改选定的状态,您的组件就会根据该状态显示正确的数据。太棒了。是的,我知道在我的实现中,很多仍然是占位符代码(例如,同一文件中的静态赋值
)。我想我没有必要过分复杂化实现,而不是专注于基础