click button javascript

1var element = document.getElementById("elem");
2element.onclick = function(event) {
3  console.log(event);
4}

1var button = document.getElementById("button");
2button.click();

1// Create variable for what you are trying to click
2let button = document.querySelector("#IDofItem");
3
4// Click the button
5
6if (button) {
7  button.click();
8}
9else {
10  console.log("Error");
11}

1<script>
2  $(document).ready(function(){
3    $('#MyButton').click(function(){
4       CapacityChart();
5    });
6  });
7</script>
8
9<input type="button" value="Capacity Chart" id="MyButton" >

1<button onclick="myFunction()">Click me</button>
2
3<p id="demo"></p>
4
5<script>
6function myFunction() {
7  document.getElementById("demo").innerHTML = "Hello World";
8}
9</script>

1<button onClick="alert('some thing to say');">click</button>