Question

我有以下两个组成部分：

出于可读性考虑，我将跳过此问题中的import和export s

Explorer.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>
    ) 
}

基本上是我要执行的操作，单击以取消选择以前突出显示的组件并突出显示新组件。

在map内部，我将isSelected道具翻转到旧的selected元素和newSelection上

 return <Program key={el.props.name} name={el.props.name} isSelected={!el.props.isSelected}/>

然后是 Program.js

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>
    )

}

在控制台日志记录中，我确定我选择的是元素名称还是el.props.isSelected，它只是在返回的映射上，似乎并没有影响结果

Answer 1

我想问题是您正在使用静态isSelected属性-您需要使用状态selected变量：

let dirArr = [ 
   <Program key={"C"} name="C" isSelected={selected === 'C'}/>, 
   <Program key={"D"} name="D" isSelected={selected === 'D'}/>
];

似乎无法更改组件的道具

1 个答案: