JavaScript onClick Event Listener
document.getElementById("myBtn").addEventListener("click", function() {
alert("Hello World!");
});
Batman
document.getElementById("myBtn").addEventListener("click", function() {
alert("Hello World!");
});var element=document.getElementById("some_id");
var listener=element.addEventListener('click',function(event){
}); element.addEventListener("click", function(){
element.innerText = "something";
}); function simulateClick() {
// Get the element to send a click event
const cb = document.getElementById("checkbox");
// Create a synthetic click MouseEvent
let evt = new MouseEvent("click", {
bubbles: true,
cancelable: true,
view: window
});
// Send the event to the checkbox element
cb.dispatchEvent(evt);
}
document.getElementById("button").addEventListener('click', simulateClick);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>
);
}
}