event listener javascript
const element = document.querySelector(".class__name");
element.addEventListener("click", () => {
console.log("clicked element");
});event listener javascript
const element = document.querySelector(".class__name");
element.addEventListener("click", () => {
console.log("clicked element");
});Add Event Listeners
class MyComponent extends React.Component {
constructor(props) {
super(props);
this.state = {
message: ""
};
this.handleEnter = this.handleEnter.bind(this);
this.handleKeyPress = this.handleKeyPress.bind(this);
}
// change code below this line
componentDidMount() {
document.addEventListener("keydown", this.handleKeyPress);
}
componentWillUnmount() {
document.removeEventListener("keydown", this.handleKeyPress);
}
// change code above this line
handleEnter() {
this.setState({
message: this.state.message + "You pressed the enter key! "
});
}
handleKeyPress(event) {
if (event.keyCode === 13) {
this.handleEnter();
}
}
render() {
return (
<div>
<h1>{this.state.message}</h1>
</div>
);
}
}Copyright © 2021 Codeinu
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