window.onunload javascript code example

Example 1: window.onload

window.onload = function() {
  // Some code
};

Example 2: window onload javascript

//Use window.onload to to execute JavaScript only after the HTML has loaded
//Syntax: 
window.onload = function() {
  //JavaScript goes here
}

Example 3: js before unload

window.addEventListener('beforeunload', (event) => {
  // Cancel the event as stated by the standard.
  event.preventDefault();
  // Chrome requires returnValue to be set.
  event.returnValue = '';
});

Example 4: window.onload

window.onload = function() {
  init();
  doSomethingElse();
};