enter button submit form javascript

  // 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();
  
  }
});