Load a component after getting API fetched data in React.js

Question

My components code is like below

componentDidMount = () => {
    this.props.dispatch(getCountry());
}


render() {

let rows = this.props.countries.map((item, index) => (//some code here));


return (
      <div>
        {rows ? (
          //components HTML code here
       ) : (
          <img src="loading.gif" alt="Loading ..."/>
        )}
      </div>
)
}

But the component is loading before API fetched data.

Answer 1

You can check for rows data since it would be an empty array if not fetched.

return (
      <div>
        {rows && rows.length ? (
          //components HTML code here
       ) : (
          <img src="loading.gif" alt="Loading ..."/>
        )}
      </div>
)

You can also write your condition like rows && rows.length > 0 same with rows && rows.length. Therows.length if it's empty will resolved to 0 which is false, but if greather than 0 will be true(Typecasting or type conversion).

return (
      <div>
        {(rows && rows.length > 0 ? (
          //components HTML code here
       ) : (
          <img src="loading.gif" alt="Loading ..."/>
        )}
      </div>
)