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Just like HTML DOM events, React can perform actions based on user events. React has the same events as HTML: click, change, mouseover etc.
React events are written in camelCase syntax: onClick instead of onclick. React event handlers are written inside curly braces:
onClick={shoot}
instead of onclick="shoot()".<button onClick={shoot}>Take the Shot!</button><button onclick="shoot()">Take the Shot!</button>
function Football() {
const shoot = () => {
alert("Great Shot!");
}return (
<button onClick={shoot}>Take the shot!</button>
);
}createRoot(document.getElementById('root')).render( <Football />
);Example »
To pass an argument to an event handler, use an arrow function.
Send "Goal!" as a parameter to the shoot function, using arrow function:
function Football() {
const shoot = (a) => {
alert(a);
}return (
<button onClick={() => shoot("Goal!")}>Take the shot!</button>
);
}createRoot(document.getElementById('root')).render( <Football />
);Example »
Event handlers have access to the React event that triggered the function. In our example the event is the "click" event.
Arrow Function: Sending the event object manually:
function Football() {
const shoot = (a, b) => {
alert(b.type);/* 'b' represents the React event that triggered the function, in this case the 'click' event */
}return (
<button onClick={(event) => shoot("Goal!", event)}>Take the shot!</button>
);
}createRoot(document.getElementById('root')).render( <Football />
);Example » This will come in handy when we look at Form in a later chapter.