30-seconds-of-code/snippets/Tooltip.md

Tooltip

Renders a tooltip component.

Use the React.useState() hook to create the show variable and initialize it to false. Return a <div> element that contains the <div> that will be the tooltip and the children passed to the component. Handle the onMouseEnter and onMouseLeave methods, by altering the value of the show variable.

.tooltip {
  position: relative;
  background: rgba(0, 0, 0, 0.7);
  color: white;
  visibility: hidden;
  padding: 5px;
  border-radius: 5px;
}
.tooltip-arrow {
  position: absolute;
  top: 100%;
  left: 50%;
  border-width: 5px;
  border-style: solid;
  border-color: rgba(0, 0, 0, 0.7) transparent transparent;
}

function Tooltip({ children, text, ...rest }) {
  const [show, setShow] = React.useState(false);

  return (
    <div>
      <div className="tooltip" style={show ? { visibility: "visible" } : {}}>
        {text}
        <span className="tooltip-arrow" />
      </div>
      <div
        {...rest}
        onMouseEnter={() => setShow(true)}
        onMouseLeave={() => setShow(false)}
      >
        {children}
      </div>
    </div>
  );
}

 ReactDOM.render(
     <Tooltip text='Simple tooltip'>
       <button>Hover me!</button>
     </Tooltip>,
     document.getElementById('root')
 );