If-Else的ReactJS JSX语法

问题描述：

我有以下jsx代码，我试图将某些代码移出映射函数，但是jsx语法出错，我希望仅在有一些数据的情况下显示此块.

I have the following jsx code, I am trying to put some code out of the mapping function, but getting errors with the jsx syntax, I want this block displayed only if there is some data..

{this.props.someData ? 
  <div className="container">
    <h3>Heading</h3>
    <div className="block1">
      <button>one</button>
      <buttontwo</button>
    </div>  
    this.props.someData.map((response, index) => {
      return ( 
        <div className="Block2">  
          <div key={index}>
            <span>{response.number}</span>
          </div>
        </div>  
      </div> 
    );
}) : ''}

答

像这样写:

{this.props.someData ? 
     <div className="container">
          <h3>Heading</h3>
          <div className="block1">
              <button>one</button>
              <buttontwo</button>
          </div>  
          {this.props.someData.map((response, index) => {
              return ( 
                 <div className="Block2">  
                    <div key={index}>
                     <span>{response.number}</span>
                    </div>
                 </div>
              )})
           }
     </div> 
: <div/>}

您正在做的错误:

要在html元素内呈现任何js代码，必须使用{}，因为如果条件为true且在使用map的条件下呈现JSX，则呈现JSX，因此将map函数放在{}内，它将工作.

To render any js code inside html elements, {} is required, since you are rendering JSX if the condition is true and inside that using map so put map function inside {}, it will work.

If-Else的ReactJS JSX语法

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