函数内部的渲染组件

Question

class SurveyQuestion extends React.Component {
  constructor(props) {
    model.onComplete.add(function(result) {
      return <TestEmpty message="test" />;
    }
  });
}

I am new to react, apologize if this is basic question, Is there any chance that if I could return component inside the constructor function, please? When it is completed then return component.

I tried with my code, it is not working and no error message.

Answer 1

1. you cannot return component from constructor.
2. In your case you use statefull component SurveyQuestion. In this case before to use it you need instantiate a parent class Component which you inherit(extands) by passing a super(props) invoking parent class constructor first inside of your component constructor.
3. In statefull component you can rewrite your function beyond the constructor using this.state option of React if you want to track a change a statement of the properties by event(put it inside of simple eventHandler)
4. Statefull component expects from you a render method. So your return method will be inside of it. And of course don't forget about import statement anywhere you need it.;) PS
5. You could use a stateless component either. Which could be more convinient for you. Check it out here https://facebook.github.io/react/docs/components-and-props.html