add to onclick for a button javascript code example

Example 1: javascript onclick get event

<div onclick="doSomething(event,this)"></div>
<script>
     function doSomething(e,el){
         e = e || window.event;
         console.log(e); //will be the event
         console.log(el); //we be the dom element 
     }
</script>

Example 2: javascript button onclick programmatically

document.getElementById("myCheck").click();

Example 3: javascript change button onclick

function Bar() {
  document.getElementById("a").onclick = Foo();
}

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