Pass event and parameter onClick in React

Pass event and parameter onClick in React #

To pass an event and parameter onClick in React:

1. Pass an inline function to the onClick prop of the element.
2. The function should take the event object and call handleClick.
3. Pass the event and parameter to handleClick.

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const App = () => {
  const handleClick = (event, param) => {
    console.log(event);
    console.log(param);
  };

  return (
    <div>
      <button onClick={event => handleClick(event, 'hello world')}>
        Click
      </button>
    </div>
  );
};

export default App;

We set the onClick prop on the button element to an inline arrow function.

The arrow function takes the event object and calls the handleClick function passing it the event and a parameter.

Notice that we are passing a function to the onClick prop and not the result of calling one.

Copied!
<button onClick={event => handleClick(event, 'hello world')}>
  Click
</button>

If you invoke the function when passing it to the onClick prop, e.g. onClick={handleClick()}, it would get immediately called when the component mounts.

When a function is passed to the onClick prop, it will only get invoked when the event is triggered an it will always get called with the event object.