How to create a dynamic prop name in React?

Question

Is it possible to create the name of a prop dynamically? For example:

let dynamicPropName = \"someString\";

         


        

Answer 1

An inline way (very ugly and not recommended) is using a expression to define an object:

<input {...(el.required ? {required: true} : {})}>

Answer 2

If you are using es6, you can define the dynamic prop:

let dynamicProps = {"dynamicKey":"someString", "dynamicKey2":"someString"};

or

let someVariable = "xyz";
dynamicProps[someVariable] = value;

then use the spread operator:

<MyComponent {...dynamicProps} />

Inside MyComponent -

let props = {...this.props};

Now you can use Object.keys on props to get all dynamic prop names.

Edit: Added an example

class Test extends React.Component {
  
  renderFromProps() {
    return Object.keys(this.props)
    .map((propKey) =>
      <h3>{this.props[propKey]}</h3>
    );
  }
  render() {
    return (
     <div>
      <h1>One way </h1>
      <hr/>
      <h3>{this.props.name}</h3>
      <h3>{this.props.type}</h3>
      <h3>{this.props.value}</h3>
      <hr/>
     <h1> Another way </h1>
      <hr/>
      { this.renderFromProps()}
     </div>
   );
  }
  
}

const dynamicProps = { name:"Test", type:"String", value:"Hi" };

ReactDOM.render(
  <Test {...dynamicProps} />,
  document.getElementById('root')
);

<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="root">
</div>

Answer 3

It's possible to do this with JSX syntax alone with spread attribute and computed property name:

<MyComponent {...{ [dynamicPropName]: "some value" }} />