尝试使用ReactJS生成表,并且在此表中我希望有一个唯一的键来标识每一行(如ReactJS所推荐的)。以下代码运行并生成我想要的表,除了以下错误:
Warning: 'Each child in an array or iterator should have a unique "key" prop'
查看我生成的HTML'键'确实不存在领域。我也尝试过key = {index},但它不起作用
export class Tablecontent extends Component{
constructor(props){
super(props);
this.state={
fileinfo:'null'
}
}
render(){
//const fileinfo = this.props.rows;
const fileinfo = ['myFile1.doc','myFile2.doc'];
var row='';
console.log("FILEINFO:"+fileinfo);
if(fileinfo=='null')
{
row ='';
}
else {
row = fileinfo.map((data,index) =>
<tr>
<td key="filename_{index}">{data}</td>
<td key="date_{index}">2/12/2017</td>
<td key="size_{index}">2.1 MB</td>
</tr>
);
}
return(
<div>
<table>
<tbody>
<tr>
<th>Name</th>
<th>Date Created</th>
<th>Size</th>
</tr>{row}</tbody>
</table>
</div>
);
}
}
结果HTML:
<table>
<tbody>
<tr><th>Name</th><th>Date Created</th><th>Size</th></tr>
<tr><td>myFile1.doc</td><td>2/12/2017</td><td>2.1 MB</td></tr>
<tr><td>myFile2.doc</td><td>2/12/2017</td><td>2.1 MB</td>
</tr>
</tbody>
</table>
答案 0 :(得分:4)
它希望在map函数中返回外部元素上的键,如下所示。关键是React的内部使用,并且不会在html中显示。
row = fileinfo.map((data,index) =>
<tr key={index}>
<td key="filename_{index}">{data}</td>
<td key="date_{index}">2/12/2017</td>
<td key="size_{index}">2.1 MB</td>
</tr>
);