how to make event on pressing button code example

Example 1: enter event in jquery

$('#textbox').keypress(function(event){
	var keycode = (event.keyCode ? event.keyCode : event.which);
	if(keycode == '13'){
		alert('You pressed a "enter" key in textbox');
	}
});

Example 2: javascript bind key to button

//https://stackoverflow.com/questions/6542413/bind-enter-key-to-specific-button-on-page
//upvote them on stackoverflow
//jquery------------------------------------------------------
//answer by Chris Laplante  
$(document).keypress(function(e){
    if (e.which == 13){
        $("#button").click();
    }
});

//pure javascript--------------------------------------------
//answer by Alexander Kim
window.addEventListener('keyup', function(event) {
  if (event.keyCode === 13) {
    alert('enter was pressed!');
  }
});

//https://www.w3schools.com/howto/howto_js_trigger_button_enter.asp
// Get the input field
var input = document.getElementById("myInput");
// Execute a function when the user releases a key on the keyboard
input.addEventListener("keyup", function(event) {
  // Number 13 is the "Enter" key on the keyboard
  if (event.keyCode === 13) {
    // Cancel the default action, if needed
    event.preventDefault();
    // Trigger the button element with a click
    document.getElementById("myBtn").click();
  }
});