How to detect when the user presses Enter in an input field

Question

I only have 1 input field and I want to register onChange and onKeyPress event to detect when the users finish their input or press the Enter key. I need to use javascript only. Thanks for the help.

I have:

var load = function (){    //I want to trigger this function when user hit Enter key. }  document.getElementById('co').onchange=load;   //works great document.getElementById('co').onKeyPress=load;  //not sure how to detect when user press Enter 

html

//no form just a single input field <input type='text' id='co'> 

Answer 1

document.getElementById('foo').onkeypress = function(e){     if (!e) e = window.event;     var keyCode = e.code || e.key;     if (keyCode == 'Enter'){       // Enter pressed       return false;     }   } 

DEMO