on lcick event jquery code example

Example 1: jquery click event

$('#selector').on('click',function(){
    //Your code here
});

Example 2: button click function in js

<script>
  $(document).ready(function(){
    $('#MyButton').click(function(){
       CapacityChart();
    });
  });
</script>

<input type="button" value="Capacity Chart" id="MyButton" >