Reactjs 我们可以添加Html id来响应代码并生成条件吗
我有一个数组,这里我想根据span id的Reactjs 我们可以添加Html id来响应代码并生成条件吗,reactjs,Reactjs,我有一个数组,这里我想根据span id的 let wheelIndex = 1 finalarray.forEach((wheel) => { axles.push( <div className='twoaxlewheels'> <span className='infotype' id={wheelIndex}> {wheel.wheel==id && wheel.
let wheelIndex = 1
finalarray.forEach((wheel) => {
axles.push(
<div className='twoaxlewheels'>
<span className='infotype' id={wheelIndex}>
{wheel.wheel==id && wheel.sub_item?wheel.pressure:'defaultvalue'}
</span>
<span className='infotype' id={wheelIndex+1}>-</span>
</div>
)
})
let wheelIndex=1
finalarray.forEach((轮)=>{
推(
{wheel.wheel==id&&wheel.sub_项?wheel.pressure:'defaultvalue'}
-
)
})
当我运行这段代码时,它抛出的id是未定义的。是否有一种方法将span id链接到条件这就是在javascript中使用Array.forEach中的索引的方式,但我不确定wheel.wheel==id的用途。此外,您还需要为react to outer div添加一个键
finalarray.forEach((wheel, wheelIndex) => {
axles.push(
<div key={wheelIndex} className='twoaxlewheels'>
<span className='infotype' id={wheelIndex}>
{wheel.wheel==wheelIndex && wheel.sub_item?wheel.pressure:'defaultvalue'}
</span>
<span className='infotype' id={wheelIndex}>-</span>
</div>
)
})
finalarray.forEach((车轮,车轮索引)=>{
推(
{wheel.wheel==wheelIndex和wheel.sub_项?wheel.pressure:'defaultvalue'}
-
)
})
当然有。当您使用forEach时,您不必自己跟踪索引,forEach为您提供了灵活性
let wheelIndex = 1
finalarray.forEach((wheel, index) => { // index here
// you can also define an id here like this
const id = wheelIndex;
axles.push(
<div className='twoaxlewheels'>
<span className='infotype' id={id}> // use defined id here
{wheel.wheel===index && wheel.sub_item?wheel.pressure:'defaultvalue'}
</span>
<span className='infotype' id={wheelIndex+1}>-</span>
</div>
)
})
let wheelIndex=1
finalarray.forEach((轮子,索引)=>{//此处索引
//您也可以在这里像这样定义一个id
const id=车轮索引;
推(
//在此处使用定义的id
{wheel.wheel===索引和wheel.sub_项?wheel.pressure:'defaultvalue'}
-
)
})
此外,还应使用===进行相等比较,以检查值和类型。如果要将数据推送到新数组,我建议您改用
.map()
const axles = finalarray.map((wheel, index) => {
return (
<div className='twoaxlewheels'>
<span className="infotype" id={index}> // use defined id here
{wheel.wheel===index && wheel.sub_item ? wheel.pressure :'defaultvalue'}
</span>
<span className="infotype" id={index}>-</span>
</div>
)
});
const axes=finalarray.map((车轮,索引)=>{
返回(
//在此处使用定义的id
{wheel.wheel===索引和wheel.sub_项?wheel.pressure:'defaultvalue'}
-
)
});
您可以填充(并呈现)变量(数组)您不能提供以数字开头的
id
。因此,您需要在id的开头添加字符串
finalarray.forEach((wheel,wheelIndex) => {
axles.push(
<div className='twoaxlewheels'>
<span className='infotype' id={`wheel_${wheelIndex}`}>
{wheel.wheel==id && wheel.sub_item?wheel.pressure:'defaultvalue'}
</span>
<span className='infotype' id={`wheel_${wheelIndex}`}>-</span>
</div>
)
})
finalarray.forEach((车轮,车轮索引)=>{
推(
{wheel.wheel==id&&wheel.sub_项?wheel.pressure:'defaultvalue'}
-
)
})
我建议您使用.map()