javascript onclick event listener
document.getElementById("myBtn").addEventListener("click", function() {
alert("Hello World!");
});javascript onclick event listener
document.getElementById("myBtn").addEventListener("click", function() {
alert("Hello World!");
});how to check the listeners on an object js
getEventListeners(domElement)event listener javascript
const element = document.querySelector(".class__name");
element.addEventListener("click", () => {
console.log("clicked element");
});event listener javascript
//DOM Level 2 Event Listener (Advanced technique to call an event)
document.getElementById("btn2").addEventListener('click', () => {
alert("hello world");
}, false);
//our third param of DOM Level 2 Event Listener
// false = event trigger from bottom to top(bubbling phase)
// true = event trigger from top to bottom (capturing phase)
//TRADITIONAL DOM EVENT HANDLERS (very old)
function show_alert() {
alert("hello world");
}
document.getElementById("btn1").onclick = show_alert;list listener on a page js
function listAllEventListeners() {
const allElements = Array.prototype.slice.call(document.querySelectorAll('*'));
allElements.push(document);
allElements.push(window);
const types = [];
for (let ev in window) {
if (/^on/.test(ev)) types[types.length] = ev;
}
let elements = [];
for (let i = 0; i < allElements.length; i++) {
const currentElement = allElements[i];
for (let j = 0; j < types.length; j++) {
if (typeof currentElement[types[j]] === 'function') {
elements.push({
"node": currentElement,
"type": types[j],
"func": currentElement[types[j]].toString(),
});
}
}
}
return elements.sort(function(a,b) {
return a.type.localeCompare(b.type);
});
}Copyright © 2021 Codeinu
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