在ReactJS中动态添加子元素

Question

I have a Container Element and I would like to allow users to select a list of Widgets (Each Widget is different) that a User can choose to add to the container.

I have the following code for WidgetContainer:

export default class WidgetContainer extends React.Component {

  constructor(props){
    super(props);
    console.log('WidgetContainer() : props=['+props+']');
  }

  render() {
    var widgetsTmp  = '';
    if(this.props.data && this.props.data.widgets){
      widgetsTmp = this.props.data.widgets.map(function(widget){
              return (
                  <WidgetItem data={widget} key={widget.id}/>
              );
          });
    }
    return (
      <div className='container'>
        {widgetsTmp}
      </div>
    );
  }
}

And I am setting the props for WidgetContainer as below in an element which contains WidgetContainer

<WidgetContainer data={section}/>

And from my Store I am sending the details of the Widgets using the following JSON Object as initial props.

widgets:
[
  {
    title:'Widget1',
    id:'1'
  },
  {
  title:'Widget2',
  id:'2'
  }
]

I am not sure how I can specify the Widget it self declaratively?

The other option is using the children's property of the parent and add them using non JSX Syntax.

Answer 1

If you can get access to the component class, you can assign it to any capitalized variable name and render it normally via JSX.

var CapitalizedVariableName = lookupComponentClass(maybeBySomeString);
return <CapitalizedVariableName props={stuff} />;

So, as a basic example:

import Widget1 from "./widget1";
import Widget2 from "./widget2";

var widgets = {
    'Widget1': Widget1,
    'Widget2': Widget2
};

// ...

if(this.props.data && this.props.data.widgets){
    widgetsTmp = this.props.data.widgets.map(function(widget){
        var WidgetType = widgets[widget.type];
        return (
            <WidgetType data={widget} key={widget.id}/>
        );
    });
}