span不会触发OnClick内部列表反应子组件

Question

I have 2 components when the parent trigger by OnClick the child which has span element doesn't fire OnClick at all. I try it when the parent is button and it works perfectly but when the parent is list it doesn't trigger the child.

class Menu extends Component {
 handleItemClick=(e)=>{
     // whatever ..
 }
 render(){
  return(
   <ul>
     {
       items.map((item, i)=>(
            <li key={i}
                id={i}
                onClick={this.handleItemClick}>
                <Child />
                {item}
            </li>
        ))
     }
   </ul>
  )
}

class Child extends Component {
 handleSpanClick=(e)=>{
     console.log("It works!")
 }
 render(){
  return(
   <span onClick={this.handleSpanClick}></span>
  )
}

Answer 1

This looks like its probably because the span defaults to an inline element and if you haven't styled it will have 0 width so it wont have a clickable area. Try putting some text in so it actually has a clickable area to test. If this works style it with CSS (display: block, width, height etc).

Answer 2

@bunion's answer is correct!

It doesn't trigger your handleSpanClick() handler, because the <span></span> you are rendering is empty.

Either place some content in it, or either tweak the CSS display property - change it to block or inline-block and add some height and width . While developing, you can also set a background color, so you actually see where your <span></span> is.

You're code is just fine. Here's a prove, run this snippet:

 class Menu extends React.Component { handleItemClick=(e)=>{ /* whatever .. */ } render() { return( <ul> { this.props.items.map((item, i) => ( <li key={i} id={i} onClick={this.handleItemClick}> <Child /> {item} </li> ))} </ul> ) } } class Child extends React.Component { handleSpanClick=(e)=>{ console.log("It works!"); } render(){ return ( <span onClick={this.handleSpanClick}> CLICK ME (I am span) </span> ); } } ReactDOM.render(<Menu items={[ '-- I am list item, 1', '-- I am list item, 2', '-- I am list item, 3' ]} />, document.getElementById('app') ); 

 /* So we could see better where it is */ span { background-color: lightgreen; cursor: pointer; } 

 <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"></div>