Difference between “click” and onclick

Question

What is the difference between click in

document.getElementById(\"myBtn\").addEventListener(\"click\", displayDate);    

and onclick in

Answer 1

The difference is that the first is an event listener, and the second is an event handler content attribute.

Event handler content attributes store an internal raw uncompiled handler, which produces an event listener via the event handler processing and getting the current value of the event handler algorithms.

In practice, this affects the scope, e.g.

(function() { var element = document.body;
  var str = "console.log([typeof foo, typeof bar])";
  var func = function() { console.log([typeof foo, typeof bar]); };
  element.foo = 'foo';
  var bar = 'bar';
  element.setAttribute('onclick', str);
  element.addEventListener('click', func);
  element.click();
  // Event handler content attribute logs ["string", "undefined"]
  // Event listener logs ["undefined", "string"]
})();

I discourage using event handlers. They are an old reminiscence and are superseded by event listeners.

Answer 2

$("#profile-register #submit").click(function (e) {
        e.preventDefault();
        console.log("I executed")
    })

successfully prevent the default the behavior,but code below can't

$("#profile-register #submit").onclick=function (e) {
        e.preventDefault();
        console.log("I executed")
    }

it redirect the form with parameter,you can see it in the URL frame above

Answer 3

Yes, they are both events, simply put the same, and one use onclick when assign its handler inline, and the other click when assign using an event listener (which is the recommended way).

And you can't use them vice versa, as this is how it has to be done or they won't work.

Read more at MDN:

• https://developer.mozilla.org/en-US/docs/Web/Events/click
• https://developer.mozilla.org/en-US/docs/Web/Guide/Events/Event_handlers