相当于Angular 2中*ngFor的反应

Question

我想显示一个动态选择,反应组件中的值介于1和100之间.

在Angular 2中

<select>
    <option *ngFor="let i of numbers">{{i}}</option>
</select>

<!--numbers is an array [1,2,3,4,...100]-->

React怎么样？

Answer 1

您可以使用map数字并动态创建选项,如下所示:

<select>
    {
       numbers.map(el => <option value={el} key={el}> {el} </option>)
    }
</select>

检查此示例:

var numbers = [...Array(100).keys()];

var App = () => {
   return(
      <select>
        {
           numbers.map(el => <option value={el} key={el}> {el} </option>)
        }
      </select>
   )
}

ReactDOM.render(<App/>, document.getElementById('app'))

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>

<div id='app'/>